Correct: D)
Explanation: The airspeed indicator is the only instrument connected to the Pitot tube, receiving total pressure to calculate airspeed by comparing it with static pressure from the static port. A (turn indicator) is a gyroscopic instrument powered pneumatically or electrically, with no Pitot connection. B (variometer) and C (altimeter) are connected only to the static pressure port, measuring changes in ambient atmospheric pressure for climb rate and altitude respectively.
Correct: A)
Explanation: When the altimeter subscale is set to a higher reference pressure (without any change in actual atmospheric pressure), the altimeter indicates a higher altitude -- the reading increases. By setting a higher pressure datum, the instrument calculates a greater difference between the reference and the actual pressure, which it interprets as being at a higher elevation. B (decreases) reverses the actual effect. C (temperature dependent) is incorrect because the subscale directly adjusts the pressure reference, independent of temperature. D (no change) is wrong because the subscale directly affects the displayed altitude.
Correct: C)
Explanation: When the static port is blocked by ice, the static pressure delivered to the variometer remains constant at the value when the blockage occurred. Both the measuring chamber and the reference reservoir are at the same frozen pressure, so no pressure difference develops regardless of the aircraft's actual vertical movement. The variometer therefore reads zero. A (descent) and B (climb) are incorrect because the variometer cannot detect any pressure change with a blocked port. D is incorrect because most variometers do not have a warning flag for static port blockage.
Correct: C)
Explanation: VNE (Velocity Never Exceed) is an absolute structural limit that must never be exceeded under any circumstances whatsoever. Beyond this speed, the risks of aeroelastic flutter, structural failure, and loss of control become real and immediate. Unlike other operational parameters that may allow temporary tolerances, VNE is categorically inviolable. A (brief exceedances), B (20% margin), and D (10% margin) all incorrectly suggest some degree of tolerance exists. There is none.
Correct: D)
Explanation: When the radio is switched on, it generates a magnetic field. If the compass and radio are installed too close together, this stray magnetic field consistently disturbs the compass needle, causing it to deviate in the same direction each time. This is a form of electromagnetic deviation, which is why regulations require minimum separation distances between the compass and electrical equipment. A is wrong because the compass operates on magnetism, not electricity. B (low fluid) would cause erratic movement, not a consistent directional shift. C (defective compass) is not the root cause when the behaviour is repeatable and linked to the radio.
Correct: C)
Explanation: FLARM (Flight Alarm) is an anti-collision system that provides information about two categories of threats: other FLARM-equipped aircraft in the vicinity (regardless of whether they are at the same altitude, crossing the path, or on a direct collision course) AND fixed obstacles such as power lines, cable cars, and masts stored in its terrain/obstacle database. A is too restrictive (same altitude only). B is too restrictive (crossing path only). D is too restrictive (collision risk only). C correctly captures the dual traffic-and-obstacle functionality.
Correct: C)
Explanation: ARM mode enables the ELT's internal G-sensor (impact sensor) to automatically trigger distress signal transmission on 121.5 MHz and 406 MHz upon detecting a violent impact such as a crash. During normal flight, the ELT must always be set to ARM. A (OFF) completely disables the ELT, preventing automatic activation. B (ON) activates continuous transmission immediately, used only for testing or manual emergency activation. D is incorrect because the automatic triggering only works when the switch is set to ARM -- it does not function in OFF mode.
Correct: D)
Explanation: Electric current is measured in Amperes (A), the SI base unit named after physicist Andre-Marie Ampere. Current measures the rate of flow of electric charge through a conductor. A (Watt) is the unit of electrical power (P = V x I). B (Volt) is the unit of voltage or electrical potential difference. C (Ohm) is the unit of electrical resistance. These four quantities are interrelated through Ohm's law (V = I x R) and the power equation (P = V x I).
Correct: C)
Explanation: Replacing a fuse with aluminium foil is strictly prohibited and dangerous. A fuse is a protective device rated to melt at a precise current threshold, protecting wiring and instruments from overcurrent damage. Aluminium foil has no defined current rating and will not interrupt the circuit during a short circuit, allowing excessive current to flow and potentially causing an electrical fire or instrument destruction. A, B, and D all suggest conditions under which this improvisation might be acceptable -- there are none. The defect must be repaired with a properly rated fuse before flight.
Correct: B)
Explanation: The primary disadvantage of VHF (Very High Frequency) communications in aviation is their quasi-optical propagation: VHF waves travel in straight lines and do not follow the Earth's curvature. This means reception range is limited to the theoretical line of sight between transmitter and receiver, which depends on the altitude of both stations. At low altitudes, range is severely limited. A (atmospheric disturbances) primarily affects HF and MF bands. C (twilight effect) is an ionospheric phenomenon affecting shortwave (HF) propagation. D (coastal effect) mainly affects MF radio waves.
Correct: C)
Explanation: The airspeed indicator is the only cockpit instrument connected to the Pitot tube. The Pitot tube provides total pressure, which the ASI compares against static pressure to derive dynamic pressure and thus indicated airspeed. A (altimeter) and D (variometer) are connected to the static port only, using static pressure changes to measure altitude and vertical speed respectively. B (turn indicator) is a gyroscopic instrument with no connection to the Pitot-static system.
Correct: C)
Explanation: Under European and ISO standards, aviation oxygen cylinders are conventionally painted black. This colour coding helps ground and flight crew quickly identify the cylinder contents. Medical oxygen cylinders are typically white (which could cause confusion), but aviation oxygen bottles are standardised as black. A (red) is typically used for flammable gases. B (orange) is not the standard. D (blue/white) may be used for medical or industrial gases but not for aviation oxygen.
Correct: D)
Explanation: The ball (inclinometer) indicates the direction of the resultant of weight and centrifugal force acting on the aircraft during a turn. In a coordinated turn, this resultant acts straight down through the aircraft's vertical axis, and the ball remains centred. If the ball moves to one side, it indicates a slip or skid -- the turn is uncoordinated. A (bank angle) is not what the ball measures; it measures coordination. B (yaw rotation) is detected by the turn coordinator, not the ball. C (lateral acceleration) is related but not the precise physical quantity the ball displays.
Correct: C)
Explanation: The minimum pilot weight requirement exists to ensure the aircraft's centre of gravity (CG) remains within approved limits. If the pilot is too light, the CG shifts aft (toward the tail), making the glider longitudinally unstable, harder to recover from stalls, and potentially dangerous. A (angle of incidence) is a fixed geometric property of the wing, unaffected by pilot weight. B (control forces) are not the primary reason for minimum weight. D (glide ratio) is affected by total weight but is not the safety reason for a minimum pilot weight.
Correct: D)
Explanation: The Airplane Flight Manual (AFM) is the official reference document for safe aircraft operation, containing operating limitations, performance data, weight and balance information, normal and emergency procedures, and technical specifications. It is specific to each aircraft type and is legally required to be carried on board. A describes the aircraft logbook or maintenance records. B is incorrect because the AFM is a regulatory document, not marketing material. C describes the maintenance manual, not the flight manual.
Correct: A)
Explanation: The automatic regulator on an on-demand oxygen system adjusts the air/oxygen mixture ratio according to altitude (providing a richer mixture at higher altitudes where ambient oxygen is scarce) and delivers oxygen only during inhalation, conserving the limited supply. B describes a pressure reducer, which is a different component. C (breathing rate adjustment) is not the primary function -- the regulator responds to altitude and inhalation demand, not breathing rate per se. D is too vague and does not capture the altitude-based mixture adjustment.
Correct: D)
Explanation: A compensated variometer (total energy compensated) uses a total energy probe to eliminate false climb/sink readings caused by the pilot's elevator inputs, such as pull-ups or push-overs. It shows the true rate of climb or sink of the air mass, independent of pilot-induced speed changes. This allows the pilot to accurately assess whether the glider is in rising or sinking air. A (Sollfahrt/MacCready) is a speed-to-fly director. B (vane variometer) describes a specific type of variometer sensor. C (netto variometer) subtracts the glider's own sink rate, which is different from total energy compensation.
Correct: B)
Explanation: The magnetic compass can be considered reliable up to approximately 30 degrees of bank angle. Beyond this, the vertical component of the Earth's magnetic field (magnetic dip/inclination) causes the compass card to tilt significantly, producing large turning errors and unreliable readings. A (40 degrees) exceeds the reliable limit. C (20 degrees) and D (10 degrees) are unnecessarily conservative -- the compass is still reasonably accurate up to 30 degrees.
Correct: C)
Explanation: When placing a glider with an ELT into hangar storage, you must verify that the ELT is not inadvertently transmitting on the emergency frequency 121.5 MHz. Accidental activation can happen during handling, and a false distress signal wastes SAR resources and must be reported immediately. A (switch to ON) would deliberately activate the ELT, which is incorrect. B (remove the battery) is not the standard procedure and could affect the ELT's certification. D (nothing) is wrong because checking for inadvertent transmission is a required precaution.
Correct: B)
Explanation: The green arc on a glider's ASI indicates the normal operating speed range within which the aircraft can be safely flown in all conditions, including turbulence. The aircraft can sustain full control deflections and maximum gust loads within this speed range without exceeding structural limits. A (camber flap range) may be indicated differently depending on the aircraft. C (smooth air only) describes the yellow arc, which is the caution range. D (maneuvering speed range) is not a standard ASI marking designation.
Correct: C)
Explanation: Compass compensation (swinging) is performed to minimise deviation errors caused by the aircraft's own metallic components (ferrous metals in the structure, engine) and electromagnetic fields from onboard electrical equipment. These create local magnetic disturbances that deflect the compass from magnetic north. A (acceleration errors) and B (turning errors) are inherent to the compass design and cannot be removed by swinging. D (declination) is a geographic property of the Earth's magnetic field that is accounted for in navigation, not corrected by compass swinging.
Correct: D)
Explanation: For aerotow takeoff, the centre-of-gravity (CG) hook, also called the belly or lower hook, must always be used. This hook position ensures that the tow force acts near the CG, providing stable and controllable flight during the tow. C (nose hook) is incorrect -- the nose hook is used for winch launching, where the upward pull angle is different. A (pilot's discretion) is wrong because the hook selection is not optional. B (grass height) is irrelevant to hook selection.
Correct: C)
Explanation: Based on the loading chart provided, with an empty weight of 250 kg and a pilot equipped weight of 110 kg, the remaining payload capacity for water ballast is determined by subtracting the empty weight and pilot weight from the maximum takeoff mass. If the maximum is 450 kg: 450 - 250 - 110 = 90 kg, which equals approximately 90 litres of water (since water has a density of 1 kg/litre). A (80 litres), B (70 litres), and D (100 litres) do not match the calculation for this specific weight combination.
Correct: C)
Explanation: The use of weak links (fusible links or Sollbruchstellen) on tow ropes is mandatory in all cases, regardless of rope material, glider type, or launch method. Weak links are designed to break at a defined load, protecting both the glider and the tow aircraft (or winch) from excessive tension that could cause structural damage or loss of control. A (two-seat only), B (synthetic ropes only), and D (natural fibre and manual specification) all create exceptions that do not exist in the regulations.
Correct: C)
Explanation: The yellow triangle on a glider's ASI marks the recommended approach speed for landing in normal (calm) conditions. This is the reference speed the pilot should fly on final approach under standard circumstances. A (smooth air speed limit) describes VNE or a caution range boundary. B (stall speed) is typically at the bottom of the green arc, not marked with a triangle. D (turbulence speed limit) may relate to VA or the top of the green arc but is not indicated by a yellow triangle.
Correct: A)
Explanation: The minimum equipment for a glider is whatever is specified in its flight manual (AFM). There is no single universal list that applies to all gliders -- each aircraft type has its own specific minimum equipment requirements defined by the manufacturer and approved by the certification authority. B, C, and D each propose a fixed list that may or may not match the requirements for any given glider type. A correctly recognises that the flight manual is the authoritative source.
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- A) Only the left one.
- B) Only the middle one.
- C) No.
- D) Yes.
Correct: D)
Explanation: The diagram shows the standard Pitot-static system connections: the Pitot tube connected to the airspeed indicator (providing total pressure), and the static port connected to the altimeter, variometer, and the static side of the airspeed indicator. When all these connections are correctly shown as per the standard installation, the answer is that the instruments are connected correctly. A (only left), B (only middle), and C (none correct) contradict the correct standard installation shown in the diagram.
Correct: D)
Explanation: The red radial mark on a glider's airspeed indicator signifies VNE (Velocity Never Exceed), the absolute maximum speed that must never be exceeded under any circumstances. Beyond VNE, there is risk of flutter, structural failure, or loss of control. A (stall speed) is at the bottom of the green arc. B (approach speed) is marked by a yellow triangle. C (turbulence speed limit) may relate to the top of the green arc but is not marked by the red radial line. D is correct.
Correct: C)
Explanation: The standard EASA colour convention for glider cockpit handles assigns red to the emergency canopy release (for rapid egress), blue to the airbrakes/spoilers (for speed and descent control), and green to the trim (for adjusting pitch forces). A incorrectly assigns red to airbrakes and blue to cable release. B incorrectly assigns red to the undercarriage. D incorrectly assigns red to airbrakes, blue to the canopy lock, and green to the undercarriage. C correctly matches all three colour-function pairs.
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Correct: B)
Explanation: Using the loading chart provided for a glider with 275 kg empty weight, the correct combination that respects both the maximum takeoff weight and the CG limits is 100 kg maximum payload with 80 litres of water ballast. A (85 kg / 100 litres) exceeds the water ballast allowance for that payload. C (110 kg / 65 litres) and D (105 kg / 70 litres) do not match the values derived from the chart for this empty weight. B is the only combination that satisfies all weight and balance constraints.
