### Q101: During a VFR flight, who is responsible for collision avoidance? ^t10q101 - A) The second pilot when two pilots are on board. - B) The flight information service. - C) The air traffic control service. - D) The pilot-in-command of the aircraft. **Correct: D)** > **Explanation:** During VFR flight, the pilot-in-command (PIC) bears full responsibility for collision avoidance using the see-and-avoid principle. This applies regardless of whether ATC or FIS provides traffic information. Option A is wrong because responsibility always lies with the PIC, not the second pilot. Option B (FIS) provides information but has no separation responsibility. Option C (ATC) may provide traffic information but VFR collision avoidance remains the PIC's responsibility. ### Q102: Which event qualifies as an aviation accident? ^t10q102 - A) Any event related to the operation of an aircraft during which at least one person was killed or seriously injured. - B) Any event related to the operation of an aircraft requiring costly repairs. - C) Any event related to the operation of an aircraft during which a person was killed or seriously injured, or the aircraft sustained damage notably affecting its structural strength, performance or flight characteristics. - D) Only the crash of an aircraft. **Correct: C)** > **Explanation:** Under ICAO Annex 13, an aviation accident is an event related to aircraft operation where a person was killed or seriously injured, OR the aircraft sustained damage significantly affecting its structural strength, performance, or flight characteristics. Both conditions independently constitute an accident. Option A is incomplete because it only mentions personal injury. Option B is wrong because cost alone does not define an accident. Option D is too narrow -- many accidents involve damage short of a complete crash. ### Q103: Which of the following exceptions to the right-of-way rules for converging routes is incorrect? ^t10q103 - A) Airships give way to gliders. - B) Aircraft give way to aircraft that are visibly towing other aircraft or objects. - C) Gliders give way to aircraft that are towing. - D) Gliders and motor gliders give way to free balloons. **Correct: C)** > **Explanation:** Option C is the incorrect statement. Under SERA.3210, aircraft towing other aircraft or objects receive right-of-way priority -- meaning other aircraft (including gliders) do NOT have to give way to towing aircraft; rather, all aircraft must give way TO towing aircraft. Option C reverses this: it claims gliders give way to towing aircraft, but the actual rule is that towing aircraft give way to gliders (gliders have higher priority). Options A, B, and D all correctly state valid right-of-way exceptions. ### Q104: What minimum meteorological conditions are required to take off or land at an aerodrome in a CTR without Special VFR authorization? ^t10q104 - A) Ground visibility 5 km, ceiling 450 m/GND. - B) Ground visibility 8 km, ceiling 450 m/GND. - C) Ground visibility 1.5 km, ceiling 300 m/GND. - D) Ground visibility 5 km, ceiling 150 m/GND. **Correct: C)** > **Explanation:** Under Swiss regulations, the minimum meteorological conditions for take-off or landing at an aerodrome within a CTR without requiring Special VFR authorisation are: ground visibility of 1.5 km and a ceiling of 300 m above ground level. These are the basic SVFR minima in Switzerland. Option A and Option B use higher visibility values than required. Option D uses an insufficient ceiling of 150 m. These values are specific to Swiss operations within CTRs. ### Q105: For VFR flights in a terminal control area or control zone, how is the vertical position of an aircraft expressed below the transition altitude? ^t10q105 - A) As flight level. - B) Either as altitude or height. - C) As height. - D) As altitude. **Correct: D)** > **Explanation:** Below the transition altitude in a TMA or CTR, the vertical position of an aircraft is expressed as altitude (height above mean sea level using the QNH altimeter setting). Flight levels are only used at or above the transition altitude. Option A (flight level) applies above the transition altitude, not below it. Option B (either altitude or height) is incorrect because the standard expression below transition altitude in controlled airspace is specifically altitude. Option C (height) is used for specific purposes like circuit height but is not the standard expression in TMAs/CTRs. ### Q106: In Switzerland, what is the minimum visibility required for VFR flight in Class G airspace without special conditions? ^t10q106 - A) 5 km. - B) 8 km. - C) 10 km. - D) 1.5 km. **Correct: D)** > **Explanation:** In Class G airspace in Switzerland, without special conditions and at low altitudes (below 3000 ft AMSL or within 1000 ft of the surface), the minimum VFR visibility is 1.5 km. This is the lowest visibility minimum in the SERA VMC table. Option A (5 km) applies in controlled airspace below FL100. Option B (8 km) applies at and above FL100. Option C (10 km) is not a standard SERA VFR visibility minimum. ### Q107: May a Flight Information Zone (FIZ) be transited without any additional formality? ^t10q107 - A) No, transit is not permitted under any circumstances for VFR flights. - B) Yes. - C) Yes, but only with the authorisation of the Flight Information Service (FIS) and only if the pilot is qualified to use radiotelephony in English. - D) Only if permanent radio contact with the Aerodrome Flight Information Service (AFIS) is maintained. Otherwise, the rules of the airspace class in which the FIZ is located apply. **Correct: D)** > **Explanation:** A FIZ may be transited by VFR flights, provided permanent radio contact with the Aerodrome Flight Information Service (AFIS) is maintained throughout the transit. If radio contact cannot be established, the pilot must follow the rules of the airspace class in which the FIZ is located. Option A is wrong because transit is not prohibited. Option B is wrong because transit is not unconditional -- AFIS contact is required. Option C incorrectly requires English-language radiotelephony qualification, which is not a specific FIZ transit requirement. ### Q108: Who is responsible for the regulatory maintenance of an aircraft? ^t10q108 - A) The maintenance organisation. - B) The mechanic. - C) The operator. - D) The owner. **Correct: C)** > **Explanation:** The operator is legally responsible for ensuring that regulatory maintenance of the aircraft is carried out in accordance with approved maintenance programmes. While the maintenance organisation (Option A) and mechanic (Option B) perform the physical work, the legal responsibility for ensuring maintenance compliance rests with the operator. Option D (owner) is not necessarily the operator -- for private aircraft the owner often acts as operator, but the regulatory responsibility is tied to the operator role specifically. ### Q109: When two aircraft approach an aerodrome at the same time to land, which one has the right of way? ^t10q109 - A) The one flying higher. - B) The faster one. - C) The smaller one. - D) The one flying lower. **Correct: D)** > **Explanation:** When two aircraft approach an aerodrome simultaneously to land, the aircraft flying lower has right of way because it is in a more advanced and committed phase of the approach. The higher aircraft must give way by extending its circuit or going around. Option A (flying higher) is the opposite of the correct rule. Option B (faster) and Option C (smaller) are not criteria used in ICAO right-of-way rules for landing priority. Speed and size are irrelevant to this determination. ### Q110: What are the minimum VMC values in Class E airspace at 6500 ft (2000 m) AMSL? Visibility - Cloud clearance: vertically - horizontally ^t10q110 - A) 8.0 km - 300 m - 1500 m - B) 1.5 km - 50 m - 100 m - C) 5.0 km - 300 m - 1500 m - D) 8.0 km - 100 m - 300 m **Correct: A)** > **Explanation:** At 6500 ft (2000 m) AMSL in Class E airspace, which is above 3000 ft AMSL and above 1000 ft AGL, the SERA.5001 VMC minima are: 8 km visibility, 300 m vertical cloud clearance, and 1500 m horizontal cloud clearance. Option B describes values for very low-altitude uncontrolled airspace, far too low for this altitude. Option C uses 5 km visibility, which is insufficient for Class E at this altitude. Option D has the correct visibility but incorrect cloud clearance values (100 m and 300 m are too small). ### Q111: What is the function of the signal square at an aerodrome? ^t10q111 - A) It is a specially marked area to pick up or drop towing objects - B) Aircraft taxi to this square to get light signals for taxi and take-off clearance - C) It contains special symbols to indicate the conditions at the aerodrome visually to over-flying aircraft - D) It is an illuminated area on which search and rescue and fire fighting vehicles are placed **Correct: C)** > **Explanation:** The signal square (also called the signals area) is a designated area at an aerodrome where ground signals are displayed using symbols, panels, and markings to visually communicate aerodrome conditions to pilots flying overhead. This is particularly important for pilots who cannot receive radio communication. Option A (tow object area) describes a completely different facility. Option B is wrong because aircraft do not taxi to the signal square for light signals -- those come from the control tower. Option D describes an emergency vehicle staging area, not the signal square. ### Q112: How are two parallel runways designated? ^t10q112 - A) The left runway gets the suffix "L", the right runway remains unchanged - B) The left runway remains unchanged, the right runway designator is increased by 1 - C) The left runway gets the suffix "-1", the right runway "-2" - D) The left runway gets the suffix "L", the right runway "R" **Correct: D)** > **Explanation:** Per ICAO Annex 14, when two parallel runways exist, they are distinguished by adding suffixes: "L" (Left) for the left runway and "R" (Right) for the right runway, as seen from a pilot on final approach. Both runways must receive a suffix to avoid ambiguity. Option A is wrong because the right runway also needs a suffix ("R"). Option B uses a non-standard method of incrementing the designator number. Option C uses dash-number notation that is not part of ICAO runway designation standards. ### Q113: Which runway designators are correct for two parallel runways? ^t10q113 - A) "24" and "25" - B) "18" and "18-2" - C) "26" and "26R" - D) "06L" and "06R" **Correct: D)** > **Explanation:** For two parallel runways, ICAO requires both to carry the L/R suffix with the same number, such as "06L" and "06R." This clearly identifies them as parallel runways on the same magnetic heading. Option A ("24" and "25") indicates two non-parallel runways on slightly different headings, not parallel runways. Option B ("18" and "18-2") uses non-standard dash notation. Option C ("26" and "26R") is incorrect because only one runway has a suffix -- both must have one (should be "26L" and "26R"). ### Q114: What does this sign at an aerodrome indicate? See figure (ALW-011) Siehe Anlage 1 ^t10q114 - A) Landing prohibited for a longer period - B) After take-off and before landing all turns have to be made to the right - C) Glider flying is in progress - D) Caution, manoeuvring area is poor **Correct: C)** > **Explanation:** The ALW-011 figure shows the international ground signal for glider operations in progress at the aerodrome. This warns pilots overflying the aerodrome that gliders may be operating in the vicinity, including tow-launching and soaring. Option A (landing prohibited for a longer period) uses a different signal (typically a red cross). Option B (right-hand turns) would be indicated by a different signal in the signals area. Option D (poor manoeuvring area) is also communicated through a different ground marking. ### Q115: What does "DETRESFA" signify? ^t10q115 - A) Rescue phase - B) Alerting phase - C) Distress phase - D) Uncertainty phase **Correct: C)** > **Explanation:** DETRESFA is the ICAO codeword for the distress phase, the most serious of the three emergency phases defined in ICAO Annex 12 and Annex 11. It is declared when an aircraft is believed to be in grave and imminent danger requiring immediate assistance. Option B (alerting phase) corresponds to the codeword ALERFA. Option D (uncertainty phase) corresponds to INCERFA. Option A (rescue phase) is not a defined ICAO emergency phase designation. ### Q116: Who provides the search and rescue service? ^t10q116 - A) Only civil organisations - B) International approved organisations - C) Both military and civil organisations - D) Only military organisations **Correct: C)** > **Explanation:** Per ICAO Annex 12, Search and Rescue (SAR) services are provided by both military and civil organisations, depending on national arrangements. Many countries combine military assets (helicopters, aircraft, ships) with civil emergency services for effective SAR coverage. Option A is wrong because military organisations play a major role in SAR operations worldwide. Option B incorrectly requires international approval, which is not how SAR is organised. Option D is wrong because civil organisations are also involved in SAR. ### Q117: In the context of aircraft accident and incident investigation, what are the three categories of aircraft occurrences? ^t10q117 - A) Event Serious event Accident - B) Incident Serious incident Accident - C) Happening Event Serious event - D) Event Crash Disaster **Correct: B)** > **Explanation:** Under ICAO Annex 13 and EU Regulation 996/2010, aircraft occurrences are classified into three categories: incident (an occurrence that affects or could affect flight safety), serious incident (an incident where there was a high probability of an accident), and accident (an occurrence resulting in fatal/serious injury or substantial aircraft damage). Option A, Option C, and Option D all use non-standard terminology ("event," "happening," "crash," "disaster") not found in ICAO definitions. ### Q118: While slope soaring with the hill on your left, another glider approaches from the opposite direction at the same altitude. What should you do? ^t10q118 - A) Pull on the elevator and divert upward - B) Divert to the right and expect the opposite glider to do the same - C) Divert to the right - D) Expect the opposite glider to divert **Correct: C)** > **Explanation:** When slope soaring and encountering an oncoming glider, the pilot with the hill on their left must give way by turning right (away from the hill). In this scenario, the hill is on your left, so the approaching glider has the hill on their right, giving them right-of-way. You must divert to the right. Option A (pull up) is impractical and dangerous in slope soaring conditions. Option B is partially correct in the action but wrong to expect the other glider to also turn -- they have right-of-way. Option D is wrong because you are the one who must give way. ### Q119: When circling in a thermal with other gliders, who determines the direction of turn? ^t10q119 - A) The glider at the highest altitude - B) The glider with the greatest bank angle - C) Circling is always to the left - D) The glider that entered the thermal first **Correct: D)** > **Explanation:** When joining a thermal already occupied by other gliders, the newly arriving pilot must circle in the same direction as the glider that first established the turn in that thermal. This convention ensures all gliders orbit in the same direction, preventing dangerous head-on conflicts within the thermal. Option A (highest glider) is wrong because altitude does not determine turn direction. Option B (greatest bank angle) is irrelevant to the rule. Option C is wrong because there is no fixed left-turn rule -- the first glider's choice establishes the direction. ### Q120: Is it possible for a glider to enter airspace C? ^t10q120 - A) No - B) Yes, but only with the transponder activated - C) With restrictions, in case of reduced air traffic - D) Yes, but only with approval of the respective ATC unit **Correct: D)** > **Explanation:** Airspace Class C is controlled airspace where ATC clearance is mandatory for all flights, including VFR and gliders. A glider may enter Class C airspace only after obtaining an explicit clearance from the responsible ATC unit. Option A is wrong because entry is possible with proper ATC clearance. Option B is wrong because while a transponder may be required, it alone is not sufficient -- ATC clearance is the fundamental requirement. Option C is wrong because there is no rule allowing entry based on traffic density without clearance. ### Q121: What do longitudinal stripes of uniform dimensions arranged symmetrically about the centreline of a runway indicate? ^t10q121 - A) A ground roll could be started from this position - B) At this point the glide path of an ILS meets the runway - C) Do not touch down behind them - D) Do not touch down before them **Correct: D)** > **Explanation:** Longitudinal stripes arranged symmetrically about the runway centreline are the threshold markings, indicating the beginning of the runway available for landing. Pilots must not touch down before these markings. Option A (ground roll start) confuses threshold markings with a different function. Option B (ILS glide path intersection) describes the touchdown zone, not the threshold. Option C (do not touch down behind) reverses the rule -- the restriction is about landing before them, not after. ### Q122: How can a pilot in flight acknowledge a search and rescue signal on the ground? ^t10q122 - A) Deploy and retract the landing flaps multiple times - B) Fly in a parabolic flight path multiple times - C) Push the rudder in both directions multiple times - D) Rock the wings **Correct: D)** > **Explanation:** Per ICAO Annex 12, a pilot acknowledges a ground SAR signal by rocking the wings (waggling the wings laterally). This is an internationally recognised visual signal visible from the ground. Option A (flap cycling) is not a standard SAR acknowledgement signal. Option B (parabolic flight path) is not a defined signal. Option C (rudder inputs) would produce yawing motions that are difficult to see from the ground. ### Q123: An aerodrome beacon (ABN) is a... ^t10q123 - A) Rotating beacon installed at the beginning of the final approach to indicate its location to aircraft pilots from the air. - B) Fixed beacon installed at an airport or aerodrome to indicate its location to aircraft pilots from the air. - C) Rotating beacon installed at an airport or aerodrome to indicate its location to aircraft pilots from the ground. - D) Rotating beacon installed at an airport or aerodrome to indicate its location to aircraft pilots from the air. **Correct: D)** > **Explanation:** An aerodrome beacon (ABN) is a rotating beacon installed at or near an airport to help pilots locate the aerodrome from the air, particularly at night or in reduced visibility. Option A incorrectly places it at the beginning of final approach rather than at the aerodrome itself. Option B states it is a fixed beacon, but ABNs rotate to increase visibility. Option C states it is visible from the ground, but its purpose is to be seen by pilots from the air. ### Q124: What is the primary objective of an aircraft accident investigation? ^t10q124 - A) To work for the public prosecutor and help to follow-up flight accidents - B) To determine the guilty party and draw legal consequences - C) To identify the causes and develop safety recommendations - D) To clarify questions of liability within the meaning of compensation for passengers **Correct: C)** > **Explanation:** Per ICAO Annex 13 and EU Regulation 996/2010, the sole objective of an aircraft accident investigation is to prevent future accidents by identifying causal and contributing factors and issuing safety recommendations. It is explicitly not a judicial or liability process. Option A (assisting prosecutors) is outside the investigation's mandate. Option B (determining guilt) contradicts the non-punitive nature of safety investigations. Option D (establishing liability for compensation) is a civil legal matter handled separately. ### Q125: What is the validity period of the Certificate of Airworthiness? ^t10q125 - A) 6 months - B) 12 months - C) 12 years - D) Unlimited **Correct: D)** > **Explanation:** A Certificate of Airworthiness (CofA) issued under ICAO Annex 8 and EASA regulations has unlimited validity, provided the aircraft is maintained in accordance with approved programmes and the Airworthiness Review Certificate (ARC) is kept current. The CofA itself has no fixed expiry date. Option A (6 months) and Option B (12 months) may confuse the CofA with the ARC renewal period. Option C (12 years) is not a standard aviation validity period. ### Q126: What does the abbreviation ARC stand for? ^t10q126 - A) Airspace Rulemaking Committee - B) Airspace Restriction Criteria - C) Airworthiness Recurring Control - D) Airworthiness Review Certificate **Correct: D)** > **Explanation:** ARC stands for Airworthiness Review Certificate, the document issued following a successful airworthiness review confirming that an aircraft meets applicable airworthiness requirements. It is valid for one year and must be renewed for continued operation. Option A (Airspace Rulemaking Committee), Option B (Airspace Restriction Criteria), and Option C (Airworthiness Recurring Control) are not recognised EASA or ICAO abbreviations. ### Q127: The Certificate of Airworthiness is issued by the state... ^t10q127 - A) In which the aircraft is constructed. - B) Of the residence of the owner. - C) In which the aircraft is registered. - D) In which the airworthiness review is done. **Correct: C)** > **Explanation:** Under the Chicago Convention (ICAO Annex 7) and EASA regulations, the Certificate of Airworthiness is issued by the State of Registry -- the country in which the aircraft is registered. Option A (country of construction) is the state of manufacture, not necessarily the registry. Option B (owner's residence) has no bearing on CofA issuance. Option D (where the review is done) may differ from the state of registry, as reviews can be performed abroad. ### Q128: What does the abbreviation SERA stand for? ^t10q128 - A) Standard European Routes of the Air - B) Standardized European Rules of the Air - C) Specialized Radar Approach - D) Selective Radar Altimeter **Correct: B)** > **Explanation:** SERA stands for Standardised European Rules of the Air, the EU regulation (Commission Implementing Regulation (EU) No 923/2012) that harmonises rules of the air across EASA member states. It covers right-of-way, VMC minima, altimeter settings, signals, and related procedures. Option A (routes), Option C (radar approach), and Option D (radar altimeter) are invented terms not used in aviation regulation. ### Q129: What does the abbreviation TRA stand for? ^t10q129 - A) Temporary Radar Routing Area - B) Terminal Area - C) Transponder Area - D) Temporary Reserved Airspace **Correct: D)** > **Explanation:** TRA stands for Temporary Reserved Airspace, an airspace of defined dimensions temporarily reserved for specific uses such as military exercises or parachute operations. Other aircraft may not enter without permission during activation. Option A (Temporary Radar Routing Area), Option B (Terminal Area), and Option C (Transponder Area) are not standard ICAO or EASA designations for this abbreviation. ### Q130: What does an area marked as TMZ signify? ^t10q130 - A) Traffic Management Zone - B) Transportation Management Zone - C) Touring Motorglider Zone - D) Transponder Mandatory Zone **Correct: D)** > **Explanation:** TMZ stands for Transponder Mandatory Zone, an airspace designation requiring all aircraft to be equipped with and operate a functioning transponder when flying within the zone. This enables radar identification and collision avoidance systems to track traffic. Option A (Traffic Management Zone), Option B (Transportation Management Zone), and Option C (Touring Motorglider Zone) are not recognised aviation terms. ### Q131: A flight is categorised as a visual flight when the... ^t10q131 - A) Visibility in flight exceeds 8 km. - B) Flight is conducted in visual meteorological conditions. - C) Flight is conducted under visual flight rules. - D) Visibility in flight exceeds 5 km. **Correct: C)** > **Explanation:** A visual flight (VFR flight) is defined as a flight conducted in accordance with Visual Flight Rules as specified in ICAO Annex 2 and SERA. The classification is regulatory, not meteorological. Option A (8 km visibility) and Option D (5 km visibility) cite specific VMC minimums but do not define VFR flight. Option B (flight in VMC) describes the weather conditions required for VFR but is not itself the definition -- a flight in VMC could still be conducted under IFR. ### Q132: What does the abbreviation VMC stand for? ^t10q132 - A) Visual flight rules - B) Visual meteorological conditions - C) Instrument flight conditions - D) Variable meteorological conditions **Correct: B)** > **Explanation:** VMC stands for Visual Meteorological Conditions -- the minimum visibility and cloud clearance values that must be met for VFR flight to be conducted. VMC minima vary by airspace class and altitude. Option A (Visual Flight Rules) is VFR, a different abbreviation. Option C (Instrument Flight Conditions) effectively describes IMC. Option D (Variable Meteorological Conditions) is not a recognised aviation term. ### Q133: In airspace E, what is the minimum flight visibility for a VFR aircraft at FL75? ^t10q133 - A) 3000 m - B) 8000 m - C) 1500 m - D) 5000 m **Correct: D)** > **Explanation:** In Class E airspace below FL100, VFR flights require a minimum visibility of 5000 m (5 km) per SERA.5001. FL75 is below FL100, so the 5 km rule applies. Option A (3000 m) is not a standard VFR minimum at this altitude. Option B (8000 m) applies at and above FL100. Option C (1500 m) applies only in low-altitude uncontrolled airspace. ### Q134: In airspace C, what is the minimum flight visibility for a VFR aircraft at FL110? ^t10q134 - A) 5000 m - B) 1500 m - C) 3000 m - D) 8000 m **Correct: D)** > **Explanation:** In controlled airspace Class C at and above FL100, the minimum VFR flight visibility is 8000 m (8 km) per SERA. FL110 is above FL100, so the 8 km minimum applies. Option A (5000 m) applies below FL100. Option B (1500 m) applies in low-altitude uncontrolled airspace. Option C (3000 m) is not a standard SERA minimum at this altitude. ### Q135: In airspace C, what is the minimum flight visibility for a VFR aircraft at FL125? ^t10q135 - A) 1500 m - B) 3000 m - C) 5000 m - D) 8000 m **Correct: D)** > **Explanation:** In airspace Class C at and above FL100, the minimum VFR flight visibility is 8000 m (8 km). FL125 is well above FL100, confirming the 8 km minimum applies. Option A (1500 m) applies to low-altitude uncontrolled airspace. Option B (3000 m) is not a standard SERA VFR minimum. Option C (5000 m) applies below FL100 in controlled airspace. ### Q136: What are the minimum cloud clearance requirements for a VFR flight in airspace B? ^t10q136 - A) Horizontally 1.000 m, vertically 1.500 ft - B) Horizontally 1.000 m, vertically 300 m - C) Horizontally 1.500 m, vertically 1.000 m - D) Horizontally 1.500 m, vertically 300 m **Correct: D)** > **Explanation:** In ICAO airspace Class B, the cloud separation minima for VFR flights are 1500 m horizontally and 300 m (approximately 1000 ft) vertically from cloud. Option A uses only 1000 m horizontal distance (insufficient). Option B also uses only 1000 m horizontal. Option C uses 1000 m vertical, which is far too large -- the correct vertical minimum is 300 m. ### Q137: In airspace C below FL 100, what is the minimum flight visibility for VFR operations? ^t10q137 - A) 10 km - B) 8 km - C) 5 km - D) 1.5 km **Correct: C)** > **Explanation:** In airspace Class C below FL100, the SERA-prescribed minimum VFR flight visibility is 5 km (5000 m). Option A (10 km) is not a standard SERA minimum. Option B (8 km) applies at and above FL100 in Class C. Option D (1.5 km) applies only in low-altitude uncontrolled airspace or special VFR situations. ### Q138: In airspace C at and above FL 100, what is the minimum flight visibility for VFR operations? ^t10q138 - A) 5 km - B) 1.5 km - C) 8 km - D) 10 km **Correct: C)** > **Explanation:** In airspace Class C at and above FL100, the minimum VFR flight visibility required by SERA is 8 km (8000 m). This higher minimum reflects the faster closing speeds at higher altitudes. Option A (5 km) is the below-FL100 Class C minimum. Option B (1.5 km) applies only in low-altitude uncontrolled airspace. Option D (10 km) is not a standard SERA VFR minimum. ### Q139: How is the term "ceiling" defined? ^t10q139 - A) Altitude of the base of the lowest cloud layer covering more than half the sky below 20000 ft. - B) Height of the base of the lowest cloud layer covering more than half the sky below 20000 ft. - C) Height of the base of the highest cloud layer covering more than half the sky below 20000 ft. - D) Height of the base of the lowest cloud layer covering more than half the sky below 10000 ft. **Correct: B)** > **Explanation:** Ceiling is the height (referenced to the surface, not MSL) of the base of the lowest layer of cloud or obscuring phenomena covering more than half the sky (BKN or OVC, more than 4 oktas) below 20,000 ft. Option A uses "altitude" (MSL reference) instead of "height" (surface reference). Option C refers to the "highest" rather than "lowest" cloud layer. Option D limits the threshold to 10,000 ft instead of the correct 20,000 ft. ### Q140: Regarding separation in airspace E, which statement is accurate? ^t10q140 - A) VFR traffic is separated only from IFR traffic - B) VFR traffic receives no separation from any traffic - C) IFR traffic is separated only from VFR traffic - D) VFR traffic is separated from both VFR and IFR traffic **Correct: B)** > **Explanation:** In airspace Class E, ATC provides separation only between IFR flights. VFR flights receive no separation service whatsoever -- neither from IFR traffic nor from other VFR traffic. VFR pilots rely entirely on see-and-avoid. Option A incorrectly states VFR receives separation from IFR. Option C reverses the actual separation provision. Option D incorrectly claims full separation for VFR traffic. ### Q141: What kind of information is contained in the AD section of the AIP? ^t10q141 - A) Map icons, list of radio nav aids, time for sunrise and sunset, airport fees, air traffic control fees - B) Table of content, classification of airfields with corresponding maps, approach charts, taxi charts - C) Warnings for aviation, ATS airspaces and routes, restricted and dangerous airspaces. - D) Access restrictions for airfields, passenger controls, requirements for pilots, license samples and validity periods **Correct: B)** > **Explanation:** The AD (Aerodromes) section of the AIP contains information about individual aerodromes: their classification, aerodrome charts, approach charts, taxi charts, runway data, and operating information. Option A describes GEN content (map symbols, nav aids, fees). Option C describes ENR content (airspace warnings, routes, restricted areas). Option D contains a mix of items from different sections that do not correspond to the AD section. ### Q142: How is "aerodrome elevation" defined? ^t10q142 - A) The lowest point of the landing area. - B) The average value of the height of the manoeuvring area. - C) The highest point of the apron. - D) The highest point of the landing area. **Correct: D)** > **Explanation:** Per ICAO Annex 14, aerodrome elevation is the elevation of the highest point of the landing area. This is the critical reference point for QFE calculations and obstacle clearance. Option A (lowest point) would understate the elevation relevant to safe operations. Option B (average of manoeuvring area) does not reflect the critical highest-point definition. Option C (highest point of the apron) refers to the wrong area -- the apron is used for parking, not landing. ### Q143: How is the term "runway" defined? ^t10q143 - A) Rectangular area on a land aerodrome prepared for the landing and take-off of helicopters. - B) Rectangular area on a land or water aerodrome prepared for the landing and take-off of aircraft. - C) Round area on an aerodrome prepared for the landing and take-off of aircraft. - D) Rectangular area on a land aerodrome prepared for the landing and take-off of aircraft. **Correct: D)** > **Explanation:** Per ICAO Annex 14, a runway is a rectangular area on a land aerodrome prepared for the landing and take-off of aircraft. Option A specifies helicopters only (helicopter landing areas are called helipads or FATO). Option B includes water aerodromes, but runways are specific to land aerodromes. Option C describes a round shape, which is incorrect -- runways are rectangular by definition. ### Q144: What does DETRESFA mean? ^t10q144 - A) Uncertainty phase - B) Rescue phase - C) Alerting phase - D) Distress phase **Correct: D)** > **Explanation:** DETRESFA is the ICAO codeword for the distress phase, the highest of three emergency phases indicating an aircraft is believed to be in grave and imminent danger requiring immediate assistance. The three ICAO emergency phases are: INCERFA (uncertainty), ALERFA (alerting), and DETRESFA (distress). Option A is INCERFA. Option B ("rescue phase") is not a defined ICAO emergency phase. Option C is ALERFA.