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.
