=== EXISTING QUESTIONS (from SPL Exam Questions EN) ===
Source: QuizVDS.it (EASA ECQB-SPL) | 50 questions Free practice: https://quizvds.it/en-en/quiz/spl-en
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q1) - A) When a pilot has flown into cloud or fog unintentionally and therefore would like to request navigational assistance from a ground unit - B) When the traffic situation at an airport allows the transmission of information which does not need to be acknowledged by the ground station - C) When no radio communication can be established with the appropriate aeronautical station, but when evidence exists that transmissions are received at that ground unit - D) When a transmission containing important navigational or technical information is to be sent to several stations at the same time Correct: C)
Explanation: A blind transmission is used when two-way communication cannot be established, but the pilot has reason to believe the ground station can still receive. This commonly occurs when the aircraft receiver is faulty. The pilot continues transmitting relevant information — such as position and intentions — so the ground unit can at least track the situation and coordinate as needed.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q2) - A) ABB - B) ABM - C) ABE - D) ABA Correct: B)
Explanation: ABM is the ICAO-standard abbreviation for "abeam," meaning a position at a right angle to the aircraft's track — i.e., directly to the side. This abbreviation appears in flight plans, ATC communications, and aeronautical charts. It is important to use the standardized form rather than informal alternatives to ensure unambiguous interpretation across language barriers.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q3) - A) VFS - B) VRU - C) VFR - D) VMC Correct: C)
Explanation: VFR stands for Visual Flight Rules, the regulatory framework under which a pilot operates by visual reference to the ground and other aircraft. VMC (Visual Meteorological Conditions) refers to the weather conditions themselves, not the rules. VFR and VMC are related but distinct terms — a pilot files and flies VFR when the weather meets VMC criteria.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q4) - A) OBST - B) OBTC - C) OST - D) OBS Correct: A)
Explanation: OBST is the ICAO-standard abbreviation for obstacle, as defined in ICAO Annex 10 and used in NOTAMs, aeronautical publications, and ATC communications. It appears frequently in aerodrome obstacle data and NOTAM texts. OBS, while intuitively plausible, is reserved for other terms (e.g., observation) in ICAO documentation.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q5) - A) Flight information service - B) Flashing information system - C) Flight information system - D) Flashing information service Correct: A)
Explanation: FIS — Flight Information Service — is a service provided by ATC units to give pilots information useful for the safe and efficient conduct of flight, such as weather, NOTAMs, and airspace activity. In many countries, glider pilots operating outside controlled airspace will communicate with an FIS unit (e.g., on a national FIS frequency) rather than a tower or radar controller.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q6) - A) Flight information region - B) Flight integrity receiver - C) Flow integrity required - D) Flow information radar Correct: A)
Explanation: A Flight Information Region (FIR) is a defined volume of airspace within which flight information service and alerting service are provided. Each country or group of countries has one or more FIRs, and they cover all airspace including lower and upper airspace. Glider pilots should know the FIR they are operating in, as this determines which FIS frequency applies.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q7) - A) No specific opening times - B) 24 h service - C) Sunrise to sunset - D) Sunset to sunrise Correct: B)
Explanation: H24 indicates continuous operation — 24 hours a day, 7 days a week. This designation appears in AIP entries and NOTAMs to describe permanently staffed facilities such as major ATC centres or rescue coordination centres. It contrasts with HX (no specific hours), HJ (sunrise to sunset), and HN (sunset to sunrise).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q8) - A) 24 h service - B) Sunrise to sunset - C) No specific opening hours - D) Sunset to sunrise Correct: C)
Explanation: HX means the facility operates at no specific or predetermined hours — it may be available on request or intermittently. Pilots must verify actual availability via NOTAM or direct contact before relying on such a service. This is distinct from H24 (always open), HJ (daylight only), and HN (night only).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q9) - A) QTE - B) QFE - C) QNE - D) QNH Correct: B)
Explanation: QFE is the atmospheric pressure at aerodrome level. When set on the altimeter's subscale, the instrument reads zero when the aircraft is on the ground at that aerodrome. This setting is sometimes used at glider aerodromes so circuit heights are read directly as heights above field. QNH, by contrast, gives altitude above mean sea level.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q10) - A) Altitude in relation to mean sea level - B) Altitude in relation to the 1013.25 hPa datum - C) Altitude in relation to the highest elevation within 10 km - D) Altitude in relation to the air pressure at the reference airfield Correct: A)
Explanation: QNH is the local altimeter setting that, when dialled into the subscale, causes the altimeter to indicate the aircraft's altitude above mean sea level (AMSL). It is the standard setting used for navigation and ATC altitude assignments below the transition altitude. Glider pilots use QNH to ensure terrain clearance and compliance with published airspace limits.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q11) - A) Altitude in relation to the 1013.25 hPa datum - B) Altitude in relation to the air pressure at the reference airfield - C) Altitude in relation to mean sea level - D) Altitude in relation to the highest elevation within 10 km Correct: B)
Explanation: With QFE set, the altimeter reads height above the reference aerodrome — typically showing zero on the ground and the circuit height directly as a height above field. While useful at the home aerodrome, QFE requires care when operating away from base, as the reading no longer relates to sea level or terrain elsewhere.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q12) - A) Meteorological message - B) Message related to direction finding - C) Flight safety message - D) Flight regularity message Correct: C)
Explanation: ICAO classifies aeronautical messages by priority. Flight safety messages — which include ATC instructions, position reports, and related communications — hold the highest priority after distress and urgency messages. This classification ensures that safety-critical information is never delayed by lower-priority traffic such as administrative or regularity messages.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q13) - A) Concerning the safety of an aircraft, a watercraft or some other vehicle or person in sight. - B) Concerning the operation or maintenance of facilities which are important for the safety and regularity of flight operations. - C) Concerning aircraft and their passengers which face a grave and imminent threat and require immediate assistance. - D) Sent by a pilot or an aircraft operating agency which have an imminent meaning for aircraft in flight. Correct: C)
Explanation: A distress situation — signaled by the phrase MAYDAY (spoken three times) — exists when an aircraft or its occupants face a grave and imminent danger requiring immediate assistance. This is the highest priority category of aeronautical communication. The transponder code 7700 is squawked to alert radar services. Urgency (PAN PAN) is the next level down, involving a serious but not immediately life-threatening condition.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q14) - A) Sent by a pilot or an aircraft operating agency which have an imminent meaning for aircraft in flight - B) Concerning aircraft and their passengers which face a grave and imminent threat and require immediate assistance. - C) Concerning the operation or maintenance of facilities essential for the safety or regularity of aircraft operation. - D) Concerning the operation or maintenance of facilities essential for the safety or regularity of aircraft operation. Correct: D)
Explanation: An urgency message (PAN PAN, spoken three times) concerns a serious condition that requires timely assistance but does not yet pose a grave and imminent danger. Examples include medical situations, engine problems that are controllable, or a pilot who is uncertain of position. Urgency ranks below distress (MAYDAY) but above all routine traffic in priority.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q15) - A) Concerning aircraft and their passengers which face a grave and imminent threat and require immediate assistance - B) Sent by an aircraft operating agency or an aircraft of immediate concern to an aircraft in flight. - C) Concerning the safety of an aircraft, a watercraft or some other vehicle or person in sight. - D) Concerning the operation or maintenance of facilities essential for the safety or regularity of aircraft operation. Correct: D)
Explanation: Regularity messages relate to the operation and maintenance of facilities necessary for flight operations — essentially administrative and logistical communications. They carry the lowest priority in the ICAO message hierarchy, below distress, urgency, flight safety, meteorological, and NOTAM messages. They should never delay safety-critical transmissions.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q16) - A) Turn left - B) Wind 300 degrees, 5 knots - C) Request QDM - D) QNH 1013 Correct: C)
Explanation: A request for QDM (magnetic heading to steer to reach a station) implies the pilot may be uncertain of position or unable to navigate independently — making it a potential urgency or flight safety matter. Among the options listed, it carries the highest priority because it relates to navigation assistance and pilot safety. Wind and QNH information are routine, while "Turn left" is a standard ATC instruction.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q17) - A) Hotel Bravo Yuliett Kilo Mikro - B) Home Bravo Yuliett Kilo Mike - C) Hotel Bravo Yankee Kilo Mike - D) Home Bravo Yankee Kilo Mikro Correct: C)
Explanation: The ICAO phonetic alphabet specifies exact words for each letter. Y is always "Yankee" (not "Yuliett" — that is J), and M is "Mike" (not "Mikro"). H is "Hotel" and B is "Bravo." Using the correct phonetic words is essential to avoid confusion, particularly between letters that sound similar in noisy radio conditions.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q18) - A) Omega Echo Jankee Victor Kilo - B) Omega Echo Juliett Victor Kilogramm - C) Oscar Echo Jankee Victor Kilogramm - D) Oscar Echo Juliett Victor Kilo Correct: D)
Explanation: O is "Oscar" (not "Omega"), J is "Juliett" (not "Jankee"), and K is "Kilo" (never "Kilogramm"). The ICAO phonetic alphabet uses standardized English-based words chosen for their intelligibility across different languages. Using non-standard alternatives such as "Omega" or "Jankee" can cause confusion and is not permitted in standard radio communications.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q19) - A) Four five tousand. - B) Four five zero zero. - C) Four tousand five zero zero. - D) Four tousand five hundred. Correct: D)
Explanation: ICAO phraseology for altitudes uses the words "thousand" and "hundred" where applicable. 4500 ft is correctly spoken as "four thousand five hundred." Digit-by-digit recitation (e.g., "four five zero zero") is used for QNH and transponder codes, not for altitudes. The word "tousand" in the distractors also represents a common non-standard pronunciation to avoid.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q20) - A) Two hundred eighty-five. - B) Two eight five hundred. - C) Two eight five. - D) Two hundred eight five. Correct: C)
Explanation: Headings and bearings are always transmitted as three individual digits, each spoken separately: "two eight five." The words "hundred" or "thousand" are not used for headings. This digit-by-digit method prevents any ambiguity — "two eight five" can only mean 285 degrees, whereas "two hundred eighty-five" could theoretically be misheard.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q21) - A) One one niner decimal five zero. - B) One one niner decimal five zero zero. - C) One one niner decimal five. - D) One one niner tousand decimal five zero. Correct: C)
Explanation: Radio frequencies are transmitted digit by digit with "decimal" for the decimal point, and trailing zeros are dropped. 119.500 MHz is therefore "one one niner decimal five." Note that "niner" is used for 9 to avoid confusion with the German/Dutch "nein" (no). Only significant digits after the decimal are spoken; ".500" reduces to ".5."
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q22) - A) One two. - B) Twelve o'clock. - C) One two hundred. - D) One two o'clock Correct: B)
Explanation: Clock position references used to report traffic or terrain are always spoken as a natural number followed by "o'clock": "twelve o'clock" means directly ahead. This is a standard phraseology format used worldwide for traffic advisories. Omitting "o'clock" (saying just "twelve") could be confused with other numerical data, so the full expression is required.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q23) - A) Local time. - B) Time zone time. - C) UTC. - D) Standard time. Correct: C)
Explanation: All aeronautical communications use UTC (Coordinated Universal Time), previously known as GMT or Zulu time. This ensures consistency across time zones and eliminates ambiguity in international operations. Pilots must convert local time to UTC when filing flight plans or making ATC reports, and controllers always issue times in UTC.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q24) - A) Sixteen twenty - B) Two zero. - C) One six two zero. - D) One tousand six hundred two zero Correct: C)
Explanation: When transmitting times and there is any risk of ambiguity (e.g., confusion about whether only minutes or the full time is meant), ICAO requires the full four-digit UTC time spoken as individual digits: "one six two zero." This removes any doubt about whether "twenty" refers to 1620 or 0020. Abbreviated times (just minutes) are only acceptable when the hour is clearly established.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q25) - A) An error has been made in this transmission. The correct version is... - B) Permission for proposed action is granted - C) I understand your message and will comply with it - D) I have received all of your last transmission Correct: D)
Explanation: "Roger" means "I have received all of your last transmission" — it is a receipt acknowledgement only, not a commitment to comply. It must not be used where readback of specific instructions is required (such as clearances, headings, or squawk codes). Pilots sometimes confuse "Roger" with "Wilco" (will comply) — the distinction is important for ATC communication integrity.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q26) - A) I have received all of your last transmission - B) I understand your message and will comply with it - C) Permission for proposed action is granted - D) An error has been made in this transmission. The correct version is... Correct: D)
Explanation: "Correction" is used mid-transmission when a pilot or controller realizes they have made an error. The word is spoken, then the correct information follows immediately. This prevents the receiving party from acting on faulty data. It is distinct from "Negative" (which corrects a wrong assumption) and avoids the ambiguity of simply restarting a sentence.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q27) - A) I understand your message and will comply with it - B) Permission for proposed action is granted - C) I have received all of your last transmission - D) An error has been made in this transmission. The correct version is... Correct: B)
Explanation: "Approved" grants permission for a specific action that the pilot has proposed or requested. For example, a pilot requesting "request backtrack runway 27" may receive "Approved." It is synonymous with "Cleared" in some contexts but specifically responds to a pilot's proposal. "Wilco" (answer A) is the pilot's response indicating they will comply with an instruction already given.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q28) - A) Request readability - B) What is the communication like? - C) You read me five - D) How do you read? Correct: D)
Explanation: "How do you read?" is the standard ICAO phrase used to request a readability check from the receiving station. The expected response uses the readability scale from 1 (unreadable) to 5 (perfectly readable), e.g., "I read you five." This phrase is used when the pilot suspects their transmission quality may be poor, such as after changing frequency or noting interference.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q29) - A) Want - B) Apply - C) Would like - D) Request Correct: D)
Explanation: "Request" is the standard ICAO phraseology term for when a pilot wishes to obtain a clearance, service, or permission. Colloquial alternatives such as "I want" or "I would like" are not standard phraseology. For example: "Dusseldorf Radar, D-EAZF, request transit controlled airspace." Using standardized vocabulary reduces the risk of misunderstanding, particularly in high-workload or multilingual environments.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q30) - A) Affirm - B) Yes - C) Affirmative - D) Roger Correct: A)
Explanation: "Affirm" is the standard ICAO word for yes. "Affirmative" is common in military communications but "Affirm" is the correct civil aviation standard. The word "Yes" is not part of standard phraseology and should be avoided as it can be misheard. "Roger" means message received, not agreement, and must not be confused with "Affirm."
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q31) - A) Negative - B) No - C) Not - D) Finish Correct: A)
Explanation: "Negative" is the standard ICAO phraseology for "no" or "that is not correct." It is unambiguous and internationally understood. The plain word "No" is not standard phraseology and is avoided because it may be misheard or misunderstood across language barriers. "Negative" also serves to correct an incorrect assumption made by the other party.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q32) - A) Ready for departure - B) Request take-off - C) Ready for start-up - D) Ready Correct: A)
Explanation: "Ready for departure" is the standard phrase indicating the aircraft is at the holding point and prepared to take off. Note that the word "take-off" is only ever used in the actual clearance ("Cleared for take-off") or its cancellation ("Cancel take-off clearance") — pilots say "departure" for all other references to avoid premature action on a misheard word. "Ready" alone is incomplete and non-standard.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q33) - A) Pulling up - B) Going around - C) No landing - D) Approach canceled Correct: B)
Explanation: "Going around" is the standard ICAO phrase used by a pilot to notify ATC that they are discontinuing an approach and initiating a missed approach or go-around. It must be transmitted immediately when the decision is made, before any other communication. ATC will then provide instructions (e.g., runway heading, altitude to maintain). Non-standard alternatives like "no landing" or "approach canceled" are not recognized phraseology.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q34) - A) Ground - B) Control - C) Tower - D) Airfield Correct: C)
Explanation: The aerodrome control unit — responsible for aircraft on the runway and in the immediate circuit area — uses the call sign suffix "Tower" (e.g., "Dusseldorf Tower"). This distinguishes it from ground movement control ("Ground"), approach control ("Approach" or "Radar"), and area control ("Control"). Glider pilots operating at controlled aerodromes must contact the correct unit using the appropriate call sign.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q35) - A) Control - B) Tower - C) Earth - D) Ground Correct: D)
Explanation: Surface movement control — responsible for the movement of aircraft and vehicles on the manoeuvring area (taxiways, aprons) other than the runway — uses the call sign suffix "Ground" (e.g., "Frankfurt Ground"). At smaller aerodromes, the tower may handle both functions on a single frequency, but at larger airports these are separated. Pilots should not taxi without clearance from Ground.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q36) - A) Flight information - B) Info - C) Advice - D) Information Correct: D)
Explanation: FIS units use the call sign suffix "Information" (e.g., "Langen Information" or "Scottish Information"). This service provides traffic information, weather updates, and other advisories to VFR pilots operating outside controlled airspace. Glider pilots frequently use FIS frequencies during cross-country flights and must identify the unit using the correct call sign suffix.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q37) - A) AZF - B) DZF - C) DEA - D) DEF Correct: B)
Explanation: When abbreviating a five-character civil aircraft call sign, ICAO standard procedure uses the first character (nationality prefix) plus the last two characters: D-EAZF becomes D-ZF, spoken as "Delta Zulu Foxtrot" or simply "DZF." This abbreviated form may only be used after the ground station has itself used the abbreviation — establishing that both parties have unambiguously identified the aircraft.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q38) - A) After passing the first reporting point - B) If there is little traffic in the traffic circuit - C) Within controlled airspace - D) After the ground station has used the abbreviation Correct: D)
Explanation: The pilot may only begin using the abbreviated call sign once the ground station has used it first. This rule ensures that identification is unambiguous — the controller has confirmed which aircraft they are communicating with before the shortened form is adopted. Self-initiated abbreviation can lead to confusion if multiple aircraft with similar endings are on frequency.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q39) - A) Using the last two characters only - B) Using all characters - C) Using the first three characters only - D) Using the first two characters only Correct: B)
Explanation: At first contact with any ATC unit, the pilot must use the full aircraft call sign (e.g., D-EAZF in full as "Delta Echo Alfa Zulu Foxtrot"). This allows the controller to positively identify the aircraft before any abbreviation is established. Using a partial call sign at first contact risks confusion with other aircraft and is contrary to ICAO standard procedures.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q40) - A) Dusseldorf Tower over - B) Dusseldorf Tower D-EAZF - C) Dusseldorf Tower D-EAZF - D) Tower from D-EAZF Correct: B)
Explanation: The standard format for initial contact is: station called, then own call sign — "Dusseldorf Tower, Delta Echo Alfa Zulu Foxtrot." The word "Over" is optional at the end of a transmission but not required for initial calls. The format "Tower from D-EAZF" is non-standard and should be avoided. The station is addressed first so they know to listen, then the calling aircraft identifies itself.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q41) - A) The transmission is readable but with difficulty - B) The transmission is perfectly readable - C) The transmission is readable now and then - D) The transmission is unreadable Correct: D)
Explanation: The ICAO readability scale runs from 1 to 5: 1 = Unreadable, 2 = Readable now and then, 3 = Readable but with difficulty, 4 = Readable, 5 = Perfectly readable. A readability of 1 means the receiving station cannot understand the transmission at all. If a pilot receives a readability 1 report, they should consider changing frequency, transmitter power, or antenna position.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q42) - A) The transmission is readable but with difficulty - B) The transmission is unreadable - C) The transmission is perfectly readable - D) The transmission is readable now and then Correct: D)
Explanation: Readability 2 means the transmission is only intermittently intelligible — the receiving station catches parts of the message but cannot reliably understand it. This might result from atmospheric interference, weak signal, or excessive background noise. In practice, a pilot reporting readability 2 should attempt to improve transmission quality or relay through another aircraft.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q43) - A) The transmission is perfectly readable - B) The transmission is readable now and then - C) The transmission is unreadable - D) The transmission is readable but with difficulty Correct: D)
Explanation: Readability 3 means the transmission is intelligible but requires effort — words may be unclear and the listener must concentrate. This level is often acceptable for short operational messages but is not ideal for complex instructions or clearances. Pilots and controllers should attempt to improve signal quality if readability remains at 3 for extended periods.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q44) - A) The transmission is readable now and then - B) The transmission is readable but with difficulty - C) The transmission is unreadable - D) The transmission is perfectly readable Correct: D)
Explanation: Readability 5 is the best possible signal quality — the transmission is perfectly clear and intelligible. When asked "How do you read?" a response of "I read you five" (or "readability five") indicates ideal communication conditions. Glider pilots should aim for readability 4-5 on all ATC frequencies, particularly when receiving critical instructions such as clearances or emergency guidance.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q45) - A) Runway in use - B) Altitude - C) Wind - D) SSR-Code Correct: C)
Explanation: Wind information is considered advisory and does not require readback — it is acknowledged with "Roger" or simply absorbed. Items that must be read back include: ATC route clearances, clearances to enter, land on, take off from, cross, or backtrack a runway, runway in use, altimeter settings, SSR codes, level instructions, heading and speed instructions. Wind is not in this safety-critical readback category.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q46) - A) Altimeter setting - B) Traffic information - C) Heading - D) Taxi instructions Correct: B)
Explanation: Traffic information (e.g., "traffic at your two o'clock, one thousand feet above") is acknowledged with "Roger" or "Traffic in sight" — it does not require a formal readback. In contrast, altimeter settings, headings, and taxi instructions are all subject to mandatory readback requirements under ICAO procedures, as errors in these items can have direct safety consequences.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q47) - A) DZF after lift-off climb straight ahead 2500 feet, then turn right heading 220, 090 degrees, 5 knots - B) DZF after lift-off climb straight ahead 2500 feet, then turn right heading 220, 090 degrees, 5 knots, cleared for take-off - C) DZF after lift-off climb straight ahead 2500 feet, wilco, heading 220 degrees, 090 degrees, 5 knots, cleared for take-off - D) DZF after lift-off climb straight ahead 2500 feet, then turn right heading 220, runway 12, cleared for take-off Correct: D)
Explanation: The readback must include all safety-critical items: departure instructions (climb straight ahead to 2500 ft, turn right heading 220), runway in use (runway 12), and the take-off clearance. Wind information does not require readback and is correctly omitted. Option B incorrectly reads back the wind, and option C uses "wilco" inappropriately mid-readback. The runway and clearance phrase must be included.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q48) - A) Positive - B) Wilco - C) Report PAH - D) Roger Correct: B)
Explanation: "Wilco" (from "will comply") is the correct response when a pilot understands and intends to comply with an instruction. "Next report PAH" is an instruction requiring future action, so "Wilco" confirms both receipt and intention to comply. "Roger" only confirms receipt without implying compliance. "Positive" is not standard phraseology in this context.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q49) - A) Roger - B) Squawk 4321, 131.325 - C) Squawk 4321, wilco - D) Wilco Correct: B)
Explanation: SSR transponder codes (squawk codes) and frequency changes must be read back — they are safety-critical items. The pilot must read back the squawk code (4321) and the new frequency (131.325) to confirm correct receipt. "Roger" alone or "Wilco" alone is insufficient. If the wrong code is set or the wrong frequency dialled, both situations carry serious safety implications.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^q50) - A) Roger - B) Airspace Delta - C) Wilco - D) Entering Correct: A)
Explanation: "You are now entering airspace Delta" is an informational statement from ATC — it describes what is happening, not an instruction requiring future action. "Roger" (I have received your message) is therefore the correct and sufficient response. "Wilco" would imply a future action to comply with, which is inappropriate here. No readback of the airspace type is required for a pure information message.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_8) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: A)
Explanation: ATC frequencies must not be used for personal requests (taxi). Such a message is inadmissible because it monopolizes a frequency reserved for aeronautical communications and does not meet any criteria for flight safety or regularity.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_19) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: B)
Explanation: In VFR flight, radio is mandatory in Class C airspace. Without radio, the previously obtained clearance is insufficient — the pilot must set the transponder to code 7600 (radio failure), leave the controlled airspace as quickly as possible and land at the nearest suitable aerodrome.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_4) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: B)
Explanation: VOLMET is the continuous radio broadcast service for METARs and TAFs for several aerodromes. It allows pilots in flight to obtain real-time meteorological observations for their destination and alternate aerodromes. SIGMET and AIRMET relate to significant meteorological phenomena over a region, not observations for specific aerodromes.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_11) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: A)
Explanation: QNH is the altimeter setting referenced to mean sea level. When set in the altimeter subscale, the instrument reads aerodrome elevation above mean sea level when on the ground. It is distinct from QFE (pressure at aerodrome level, altimeter reads zero on the ground) and QNE (standard 1013.25 hPa, used in flight level airspace).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_5) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: B)
Explanation: QDM is the magnetic heading to steer to reach the station (without wind correction). It is distinct from QDR (magnetic bearing from the station) and QTE (true bearing from the station). A request for QDM often indicates that the pilot is trying to orientate — which gives it a potentially urgent character.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_13) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: C)
Explanation: The distress phrase "MAYDAY MAYDAY MAYDAY" or the urgency phrase "PAN PAN PAN PAN PAN PAN" — the key word is repeated three times. This repetition is required by ICAO to ensure that the nature of the message is clearly identified even in poor radio conditions or with partial interference.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_16) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: A)
Explanation: An urgency message (PAN PAN) should, where possible, contain: the identification and type of aircraft, the nature of the emergency, the intentions of the crew, and the position, level and heading of the aircraft. These elements allow ATC services to provide effective assistance and coordinate the necessary resources.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_10) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: B)
Explanation: The order of priority in the aeronautical mobile service is: 1. Distress messages (MAYDAY), 2. Urgency messages (PAN PAN), 3. Flight safety messages. Meteorological messages (SIGMET, etc.) and then regularity messages follow. This order ensures that life-threatening situations are always addressed first.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_20) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: D)
Explanation: The standard ICAO phonetic alphabet: B = Bravo, A = Alpha, F = Foxtrot, O = Oscar. Alternatives such as "Otto", "Anna", "Fox" or "Beta" are non-standard local variants that must not be used in international aeronautical communications.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_1) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: A)
Explanation: The correct format for transmitting a position/heading is: "Heading" followed by three digits (always three, so "045" not "45"), then the altitude in feet when below the transition altitude. Flight level (FL) is only used above the transition altitude. The format "045 degrees and 2,500 feet" mixes the degree symbol and conjunction, which are not part of standard phraseology.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_18) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: B)
Explanation: Long waves (LW / LF, Low Frequency) travel the greatest distance because they diffract around the curvature of the Earth. VHF and UHF waves used in aviation for radio communications propagate by line of sight and are therefore limited by the radio horizon distance. Medium waves (MW) have an intermediate range.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_15) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: A)
Explanation: UTC (Coordinated Universal Time) is the time standard used in international aviation. Although GMT (Greenwich Mean Time) is historically similar, UTC is the official designation adopted by ICAO. LT (Local Time) and LMT (Local Mean Time) are not used in official aeronautical communications and publications.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_2) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: B)
Explanation: ICAO recommends a speaking rate of approximately 100 words per minute for radio communications. An excessively high rate reduces intelligibility, especially in degraded radio conditions or for interlocutors whose first language is not English. A steady, moderate rate facilitates understanding and reduces the risk of miscommunication.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_14) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: C)
Explanation: ICAO standard phraseology is the norm in aeronautical radiotelephony — it reduces the risk of misunderstandings and ensures mutual understanding in a multilingual environment. Plain language is only permitted for situations that have no corresponding standard phraseology. Option D is too restrictive: plain language remains permissible in certain contexts even in controlled airspace.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_7) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: D)
Explanation: AFIS (Aerodrome Flight Information Service) is the flight information service specific to an aerodrome. It provides pilots with information about aerodrome activity (wind, runway in use, known traffic) but is not a control service — AFIS does not issue clearances. It is distinct from FIS (Flight Information Service) which covers a larger region.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_17) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: C)
Explanation: The abbreviation rule for five-character civil aircraft call signs retains the first letter (nationality prefix) and the last two characters: AB-CDE becomes A-DE. This rule applies in the same way as for D-EAZF becoming D-ZF. Abbreviation is only permitted after the ground station has used it first.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_9) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: D)
Explanation: The pilot may abbreviate their call sign only after the ground station has done so first. The initiative to abbreviate always belongs to the controller or ground operator. If the ground station has not abbreviated the call sign, the pilot must use the full call sign.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_12) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: D)
Explanation: The items that must always be read back are: runway in use, altimeter settings, SSR codes (transponder), level instructions (altitude/FL), and heading and speed instructions. Surface wind and visibility are advisory information that do not require a read-back. This list corresponds exactly to the ICAO/EASA requirements for VFR operations.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_6) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: A)
Explanation: "Squawk ident" is the controller's instruction asking the pilot to press the IDENT button on their transponder. This generates a special signal on the radar display that makes the aircraft's symbol blink or stand out, allowing the controller to identify it quickly among surrounding traffic. Identification is confirmed by the controller with "Identified" or "Squawk confirmed."
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_90_3) Source: BAZL/OFAC Serie 1 - Branches Communes
Correct: D)
Explanation: The read-back of an ATC clearance always ends with the call sign of the aircraft. This allows the controller to confirm unambiguously which aircraft has received and repeated the clearance. Ending with the call sign of the ground station would be a procedural error. "Roger" and "Wilco" may appear in the response but do not replace the final aircraft identification.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_1) - A) Messages concerning flight safety. - B) Messages concerning flight regularity. - C) Urgency messages. - D) Distress messages. Correct: D)
Explanation: An aircraft in a distress situation transmits distress messages. Distress implies a serious and imminent danger requiring immediate assistance (ICAO Annex 10).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_2) - A) When there is no possibility of confusion. - B) Once communication is well established. - C) In case of heavy traffic. - D) When the aeronautical station has used the abbreviated callsign when addressing the aircraft. Correct: B)
Explanation: An aircraft may use its abbreviated callsign once radio communication is well established with the ground station, and only after the ground station has itself used the abbreviated callsign first.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_3) - A) Display SSR emergency code 7500. - B) Try to establish communication with other aircraft or other aeronautical stations. - C) Land at the nearest aerodrome on route. - D) Proceed to the alternate aerodrome. Correct: B)
Explanation: If an aircraft fails to establish contact, it should try to establish communication with other aircraft or stations that could relay the message. Code 7500 is for hijacking, not radio failure.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_4) - A) 6500 KHz. - B) 121.500KHz. - C) 121.500MHz. - D) 123.45MHz. Correct: C)
Explanation: The international VHF distress frequency is 121.500 MHz. (121.500 KHz would be HF, not VHF). This is the universal guard frequency.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_5) - A) NOVEMBER DELTA GAMMA FOX. - B) NOVEMBER DECEMBER GOLF FOXTROT - C) NORBERT DELTA GOLF FOX. - D) NOVEMBER DELTA GOLF FOXTROT. Correct: D)
Explanation: According to ICAO phonetic alphabet: N = NOVEMBER, D = DELTA, G = GOLF, F = FOXTROT. Answer (d) is correct.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_6) - A) A radio station of the aeronautical fixed service, on the ground or on board an aircraft, intended for the exchange of radio communications. - B) Any radio station intended for the exchange of radio communications. - C) A radio station of the aeronautical fixed service. - D) A land station of the aeronautical mobile service. In certain cases, an aeronautical station may be located on board a ship or offshore platform. Correct: D)
Explanation: An aeronautical station is a ground station of the aeronautical mobile service. It can provide communication services to aircraft in flight.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_7) - A) Continuous day and night service. - B) From sunrise to sunset. - C) No fixed operating hours. - D) From sunset to sunrise. Correct: B)
Explanation: HJ means 'from sunrise to sunset' (from French: Heure de Jour). It is the standard ICAO abbreviation used in AIPs and NOTAMs.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_8) - A) Surface wind, runway in use, altimeter settings, level instructions, SSR codes. - B) Runway in use, visibility, surface wind, heading instructions, altimeter settings. - C) Surface wind, visibility, temperature, runway in use, altimeter settings, heading and speed instructions. - D) Runway in use, altimeter settings, level instructions, SSR codes, heading and speed instructions. Correct: A)
Explanation: ATIS (Automatic Terminal Information Service) always contains: surface wind, runway in use, altimeter settings, and transition level information. These are the essential elements defined by ICAO.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_9) - A) Messages concerning flight regularity. - B) Messages concerning flight safety. - C) Urgency messages. Correct: B)
Explanation: ATC clearances, instructions, and weather information are messages concerning flight safety. They have high priority in the aeronautical message hierarchy.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_10) - A) Set code 1234 on the transponder and switch it to ON. - B) Transmit briefly (1-2-3-4) for a bearing. - C) Conduct a radio check on frequency 123.4 MHz. - D) Be ready to monitor frequency 123.4 MHz. Correct: A)
Explanation: The instruction 'Squawk 1234' means: set code 1234 on the transponder and activate the appropriate mode (mode C or mode S depending on equipment).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_11) - A) Airport Terminal Information Service - B) Automatic Terminal Information Service - C) Automatic Terminal Information System - D) Air Trafic Information Service Correct: B)
Explanation: ATIS stands for 'Automatic Terminal Information Service'. It is the looping recording of meteorological and operational information for an aerodrome.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_12) - A) AERODROME. - B) FLIGHT CENTER - C) INFORMATION. - D) INFO Correct: C)
Explanation: The call sign of the Flight Information Service is 'INFORMATION'. Example: 'Geneva Information' or 'Zurich Information'.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_13) - A) Magnetic bearing from the station - B) True bearing from the station - C) Magnetic heading to the station (zero wind) - D) True heading to the station (zero wind) Correct: A)
Explanation: QDR means the magnetic bearing from the station to the aircraft (magnetic bearing FROM station). Not to be confused with QDM (magnetic bearing TO the station).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_14) - A) The ionosphere. - B) Flight altitude and topographical conditions. - C) Atmospheric disturbances, in particular thunderstorm conditions. - D) The twilight effect. Correct: B)
Explanation: VHF reception quality depends mainly on flight altitude (line-of-sight range) and topographical conditions (terrain between transmitter and receiver). The ionosphere does not affect VHF.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_15) - A) Atmospheric pressure measured at the height of the highest obstacle on an aerodrome. - B) Atmospheric pressure at the aerodrome elevation (or runway threshold). - C) Atmospheric pressure measured at a point on the earth’s surface. - D) Altimeter setting that causes the instrument to indicate the aerodrome elevation on the ground. Correct: B)
Explanation: QFE is the atmospheric pressure at the aerodrome elevation (or runway threshold). With QFE set on the altimeter, the instrument shows height above the aerodrome (0 on the ground).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_16) - A) Radio direction-finding messages, distress messages, urgency messages. - B) Distress messages, urgency messages, messages concerning safety. - C) Distress messages, messages concerning flight safety, urgency messages. - D) Meteorological messages, radio direction-finding messages, messages concerning flight regularity. Correct: B)
Explanation: Messages are classified in decreasing priority order: distress messages, urgency messages, messages concerning flight safety, regularity messages, and private messages.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_17) - A) URGENCY (preferably spoken three times). - B) MAYDAY (preferably spoken three times). e) ALERFA (preferably spoken three times). - D) PAN PAN (preferably spoken three times). Correct: D)
Explanation: The urgency signal in radiotelephony is PAN PAN (preferably spoken three times). MAYDAY is the distress signal (imminent danger). PAN PAN indicates a less severe emergency.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_18) - A) Unreadable. - B) Readable, but with difficulty. - C) Perfectly readable. - D) Readable intermittently. Correct: C)
Explanation: In the ICAO readability scale, degree 5 means 'perfectly readable'. The scale runs from 1 (unreadable) to 5 (perfectly readable).
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_19) - A) Coordinated Universal Time (UTC). - B) Local time (LT) using the 24-hour clock. - C) Local time using the AM and PM system. - D) There is no particular time system, as generally only minutes are transmitted. Correct: A)
Explanation: The universal time system used in aviation is Coordinated Universal Time (UTC), formerly GMT. All flight times, NOTAMs and weather reports are expressed in UTC.
[FR](../SPL%20Exam%20Questions%20FR/90%20-%20Communications.md#^bazl_901_20) - A) Aircraft callsign and type, nature of the distress situation, pilot’s intentions, position, level, heading. - B) Aircraft callsign, flight route, destination. - C) Aircraft callsign, departure point, position, level. - D) Aircraft callsign, position, assistance required. Correct: A)
Explanation: A complete distress message must contain: aircraft callsign and type, nature of the distress situation, pilot's intentions, position, altitude, and heading.
=== NEW QUESTIONS (from QuizVDS, not yet in set) ===
Source: EASA ECQB-SPL (new questions not in existing set) | 44 questions
Correct: D)
Explanation: In METAR cloud coverage reporting, FEW means 1 to 2 oktas (eighths) of sky covered — a very sparse cloud layer. SCT (Scattered) is 3–4 oktas, BKN (Broken) is 5–7 oktas, and OVC (Overcast) is 8 oktas (full coverage). These standardized ICAO designations are used worldwide in aviation weather reports.
Correct: C)
Explanation: SCT stands for Scattered, representing 3 to 4 oktas (eighths) of sky covered by a cloud layer in a METAR report. FEW is 1–2 oktas, BKN (Broken) is 5–7 oktas, and OVC (Overcast) is 8 oktas. Using these standardized terms ensures unambiguous cloud coverage reporting globally.
Correct: B)
Explanation: BKN stands for Broken, representing 5 to 7 oktas (eighths) of sky covered by a cloud layer in a METAR report. FEW is 1–2 oktas, SCT is 3–4 oktas, and OVC (Overcast) is 8 oktas. A broken layer still means the sky is predominantly covered, which can have significant implications for VFR flights.
Correct: D)
Explanation: Transponder code 7600 is the internationally standardized squawk code for loss of radio communication (NORDO — no radio). Code 7700 indicates a general emergency, 7500 indicates unlawful interference (hijacking), and 7000 is the standard VFR conspicuity code in many European countries. Squawking 7600 alerts ATC to the communication failure without declaring a full emergency.
Correct: C)
Explanation: When experiencing radio reception failure but still able to transmit, the pilot should begin a blind transmission with the phrase 'Transmitting blind' (or 'Transmitting blind on [frequency]'). This notifies any receiving station of the one-way nature of the transmission. 'Listen', 'Blind', or 'No reception' are not the ICAO-standard prescribed phraseology.
Correct: D)
Explanation: A blind transmission (transmitting without receiving confirmation) is made once on the current frequency (and once more on the emergency frequency if appropriate), not multiple times. Repeating it once ensures the message is heard without causing frequency congestion. Making it four or three times is excessive and not standard ICAO procedure.
Correct: D)
Explanation: Transponder code 7600 is specifically assigned for loss of radio communication (NORDO). Squawking 7600 alerts ATC radar controllers to the situation so they can provide appropriate separation and visual signals. Code 7700 is for emergencies, 7500 for hijacking, and flight into clouds is not a transponder emergency code situation.
Correct: C)
Explanation: ICAO procedures for radio failure in controlled airspace (Class D) require the pilot to continue the flight according to the last ATC clearance received while complying with VFR flight rules, or to leave the airspace by the shortest route. Flying above 5000 feet is not specified; using a 'standard routing' without relation to the last clearance is also incorrect.
Correct: C)
Explanation: An urgency message (lower priority than distress) is preceded by the phrase 'Pan Pan' spoken three times. This alerts ATC and other aircraft to a serious but not immediately life-threatening situation. 'Mayday' (spoken three times) is used for distress, and 'Urgent' or 'Help' are not ICAO-standard radiotelephony phrases.
Correct: B)
Explanation: The initial distress or urgency call should be made on the frequency currently in use, because that frequency is already monitored by the appropriate ATC unit. Switching to another frequency risks losing contact and wasting time. If there is no response, the pilot may then try the emergency frequency 121.5 MHz.
Correct: D)
Explanation: An urgency message (Pan Pan) must include: the nature of the problem or observation, any important information needed for assistance, the intentions of the pilot in command, and position/heading/altitude information. It does not need to include departure and destination aerodromes or intended routing — those details are more relevant to flight plan information, not an urgency broadcast.
Correct: D)
Explanation: The aviation voice communication band from 118.000 to 136.975 MHz falls within the Very High Frequency (VHF) range. VHF provides reliable line-of-sight communication and is the standard for civil aviation. MF (Medium Frequency), LF (Low Frequency), and HF (High Frequency) are lower frequency bands used for different purposes such as NDB navigation or long-range HF communications.
Correct: A)
Explanation: In aviation meteorology (METAR), visibility is reported in meters when it is 5 km or less (up to 5000 m in 100 m steps below 800 m, then 100 m steps up to 5000 m). When visibility is greater than 5 km, it is reported in kilometers. This threshold ensures precision at lower visibilities that are operationally critical for flight safety.
Correct: D)
Explanation: Urgency messages (Pan Pan) concern the safety of an aircraft, vessel, vehicle, or person in sight — situations that are serious but not immediately life-threatening. A distress message (Mayday) concerns aircraft and passengers facing a grave and imminent threat requiring immediate assistance. Spare parts logistics and apron personnel safety are not urgency message subjects.
Correct: D)
Explanation: Distress messages (Mayday) contain information concerning aircraft and their passengers (or other persons) who face a grave and imminent danger requiring immediate assistance — the most critical level of emergency. Urgency messages (Pan Pan) cover less immediate threats to safety of vehicles or persons. Spare parts or apron personnel scenarios are not distress situations.
Correct: B)
Explanation: Electromagnetic waves (including radio waves and light) propagate at the speed of light, approximately 300,000 km/s (3 × 10⁸ m/s) in a vacuum. The other options are incorrect by orders of magnitude — 123,000 m/s is far too slow, and 300,000 m/s or 123,000 km/s are also wrong.
Correct: C)
Explanation: In METAR reporting, visibility is reported in kilometers when it is greater than 5 km (e.g., '6KM' or '9999' for 10 km or more). When visibility is 5 km or less, it is expressed in meters for greater precision. This convention is standardized under ICAO Annex 3.
Correct: D)
Explanation: VOLMET is a continuous meteorological broadcast service providing current weather information for a series of named aerodromes, transmitted on designated VHF and HF frequencies. During a cross-country flight, VOLMET gives pilots real-time METAR information for airports along their route. GAMET and AIRMET are area forecasts, and METAR is the report format, not a broadcast service.
Correct: B)
Explanation: VHF radio waves propagate primarily by line-of-sight. Altitude directly determines how far the radio horizon extends — the higher the aircraft, the farther the radio waves can reach before being blocked by the Earth's curvature. The ionosphere affects HF propagation (sky wave), twilight error and shoreline effect affect NDB/ADF reception, not VHF.
Correct: D)
Explanation: A blind transmission (one-way transmission due to reception failure) must be made on the current frequency in use, since that is the frequency being monitored by ATC and nearby traffic. Switching to FIS, tower, or radar frequencies without having been given those frequencies is inappropriate and could cause the transmission to go unheard by the relevant authority.
Correct: D)
Explanation: Entry into Class D airspace without radio contact is only permissible when prior approval has been granted (e.g., when the pilot has already received a clearance to enter and the radio failure occurs while inside or just before entry). Without prior approval, Class D airspace cannot be entered without two-way radio communication. The presence of other traffic, departure aerodrome status, or destination status do not constitute authorization.
Correct: C)
Explanation: Transponder code 7700 is the internationally standardized emergency squawk. It alerts radar controllers to an emergency situation and triggers alarms on ATC displays. Code 7600 indicates radio failure, 7500 indicates hijacking, and 7000 is the standard VFR conspicuity code in European airspace.
Correct: C)
Explanation: VOLMET (from the French vol — flight, and météo — weather) is a radio service that continuously broadcasts meteorological information (current weather reports, METARs) for a series of aerodromes. It provides current information, not navigational data, NOTAMs, or general bulletins.
Correct: C)
Explanation: An ATIS (Automatic Terminal Information Service) broadcast is updated at 30-minute intervals (or whenever conditions change significantly) and is valid for approximately 30 minutes. Pilots should obtain the latest ATIS before contacting ATC on initial call. 45 or 60 minutes would be too long given how rapidly aerodrome conditions can change.
Correct: B)
Explanation: The ICAO standard abbreviation for 'abeam' is ABM. 'Abeam' describes a position at right angles to the aircraft's track, typically alongside a reference point. ABB, ABE, and ABA are not ICAO-recognized aviation abbreviations.
Correct: C)
Explanation: VFR is the universally recognized abbreviation for Visual Flight Rules, as standardized by ICAO. VFS and VRU are not standard abbreviations. VMC stands for Visual Meteorological Conditions — the weather conditions required for VFR flight — which is a related but distinct term.
Correct: A)
Explanation: OBST is the standard ICAO abbreviation for obstacle, used in NOTAMs, charts, and ATC communications. OBTC, OST, and OBS are not recognized ICAO abbreviations for this term (OBS can mean 'observe' in some contexts but not 'obstacle').
Correct: A)
Explanation: FIS stands for Flight Information Service — a service provided to give advice and information useful for the safe and efficient conduct of flights, without providing separation services. It is not a 'system' or a 'flashing' service; the 'flashing information' options are nonsensical distractors.
Correct: A)
Explanation: FIR stands for Flight Information Region — a specified airspace of defined dimensions within which flight information service and alerting service are provided. It is the fundamental unit of airspace management under ICAO. 'Integrity receiver', 'integrity required', and 'information radar' are not aviation terminology.
Correct: B)
Explanation: H24 is the standard ICAO abbreviation meaning 24-hour continuous service, indicating that a facility (e.g., an ATC unit or AFIS) is available at all times. Sunrise to sunset is HR (hours of daylight), no specific opening hours is HX, and sunset to sunrise is specific night hours — not H24.
Correct: C)
Explanation: HX is the ICAO abbreviation meaning no specific opening hours — the facility operates on an irregular or undefined schedule. H24 means 24-hour service, HR means hours from sunrise to sunset, and HS means hours from sunset to sunrise. Pilots should check NOTAMs or AIP for actual hours of service when HX is listed.
Correct: B)
Explanation: In ICAO radiotelephony, direction relative to the aircraft is expressed using clock positions spoken as full clock terms: 'twelve o'clock', 'three o'clock', etc. Saying 'one two' would sound like a bearing, 'one two hundred' is meaningless, and 'one two o'clock' omits the word 'twelve'. The correct standard phrase is 'Twelve o'clock'.
Correct: D)
Explanation: The word 'Roger' in ICAO radiotelephony means 'I have received all of your last transmission' — it is purely an acknowledgement of receipt and does not imply understanding or compliance. 'Wilco' (will comply) indicates understanding and intent to comply; 'Approved' grants permission; 'Correction' signals an error in a previous transmission.
Correct: D)
Explanation: The phrase 'Correction' in ICAO radiotelephony signals that an error was made in a previous part of the transmission, and the correct version follows. It does not mean receipt ('Roger'), compliance ('Wilco'), or permission ('Approved'). Pilots and controllers use it mid-transmission to self-correct without confusion.
Correct: B)
Explanation: The phrase 'Approved' in ICAO radiotelephony means 'permission for the proposed action is granted'. It is used by ATC to authorize a pilot's request. 'Roger' means receipt acknowledged, 'Wilco' means will comply, and 'Correction' signals an error in transmission.
Correct: A)
Explanation: The ICAO standard phrase for affirming (yes) a transmission is 'Affirm' — not 'Affirmative', which is not standard ICAO phraseology, and not 'Yes', which is plain language. 'Roger' means receipt acknowledged, not affirmation. 'Affirm' is specifically prescribed to avoid confusion on radio.
Correct: A)
Explanation: The ICAO standard phrase for negating (no) is 'Negative'. Plain language 'No' is not standard radiotelephony and could be misheard; 'Not' and 'Finish' have no defined meaning in ICAO phraseology. 'Negative' is unambiguous and universally understood in aviation communication.
Correct: D)
Explanation: During readback of a take-off clearance, the pilot must read back all safety-critical items: the after-liftoff instruction (climb straight ahead to 2500 ft, then turn right heading 220), the runway designator, and the clearance itself (cleared for take-off). The wind information (090/5kt) is provided for awareness but does not need to be read back. Option D correctly includes runway 12 and 'cleared for take-off' while omitting the wind.
Correct: B)
Explanation: The instruction 'Next report PAH' requires the pilot to take a specific future action (report at waypoint PAH). Because this involves a future commitment, the correct acknowledgement is 'Wilco' (will comply), not 'Roger' (which only acknowledges receipt). Saying 'Report PAH' as a standalone is incomplete, and 'Positive' is not standard phraseology.
Correct: B)
Explanation: When given a transponder code and a frequency change instruction, the pilot must read back the transponder code (to confirm the correct squawk) and the new frequency (131.325), as these are safety-critical items requiring confirmation. 'Roger' or 'Wilco' alone would not confirm the specific values; including both items in the readback ('Squawk 4321, 131.325') is the correct procedure.
Correct: A)
Explanation: The instruction 'You are now entering airspace Delta' is a statement of fact or information from ATC, not a clearance or instruction requiring compliance. The correct acknowledgement is 'Roger' — meaning 'message received'. 'Wilco' would be inappropriate because there is nothing to comply with; simply repeating 'Airspace Delta' or 'Entering' is incomplete.
Correct: D)
Explanation: In METAR cloud coverage reporting, FEW designates 1 to 2 oktas (eighths) of sky covered — the sparsest cloud layer category. SCT (Scattered) = 3–4 oktas, BKN (Broken) = 5–7 oktas, and OVC (Overcast) = 8 oktas. These standardized ICAO designations apply worldwide.
Correct: C)
Explanation: SCT (Scattered) in a METAR report means 3 to 4 oktas (eighths) of sky coverage. FEW = 1–2 oktas, BKN (Broken) = 5–7 oktas, OVC (Overcast) = 8 oktas. Scattered cloud does not necessarily restrict VFR, but pilots must check cloud base heights against VFR minima.
Correct: B)
Explanation: BKN (Broken) in a METAR report means 5 to 7 oktas (eighths) of sky coverage. FEW = 1–2 oktas, SCT = 3–4 oktas, OVC = 8 oktas. A broken layer is predominantly covered sky and may impact VFR operations if cloud bases are low, requiring careful assessment before flight.
