ATPL AIRCRAFT GENERAL KNOWLEDGE (AGK) QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE
2026/2027
SECTION ONE: QUESTIONS 1-100
1. What is the primary design philosophy that assumes an aircraft structure has a finite
safe life, and components must be retired or replaced after a predetermined period of
operation?
A. Fail-safe design
B. Damage-tolerant design
C. Safe-life design
D. Redundancy design
🟢 C. Safe-life design
🔴 RATIONALE: Safe-life design assumes a finite operational life for a component. Once
,the calculated safe life is reached, the part must be retired, regardless of its physical
appearance, to prevent catastrophic failure due to undetected fatigue. Fail-safe and
damage-tolerant designs are different approaches that allow for continued safe
operation after a failure .
2. Which of the following is a correct statement regarding the effects of a rearward (aft)
Centre of Gravity (CG) position?
A. It increases longitudinal stability.
B. It decreases cruise performance due to increased induced drag.
C. It increases the aircraft's stalling speed.
D. It improves controllability but may reduce stability.
🟢 D. It improves controllability but may reduce stability.
🔴 RATIONALE: A rearward CG reduces longitudinal stability because the distance
between the CG and the tailplane is decreased. However, it generally improves
controllability and reduces drag, as less tail-down force is required for balance. Stability
may be impaired to the point of being uncontrollable, but the primary concern is
reduced stability margins .
,3. In a large transport aircraft, what is the primary purpose of the constant speed drive
(CSD) unit in an electrical generation system?
A. To convert AC power to DC power for the aircraft's essential systems.
B. To maintain a constant rotational speed to the AC generator, ensuring a constant
frequency output.
C. To act as a backup starter motor for the engine.
D. To regulate the voltage output of the generator.
🟢 B. To maintain a constant rotational speed to the AC generator, ensuring a constant
frequency output.
🔴 RATIONALE: The CSD is a hydraulic-mechanical unit that ensures the AC generator is
driven at a constant speed (e.g., 12,000 RPM) regardless of the engine's varying RPM.
This is crucial for producing a constant frequency (e.g., 400 Hz) AC power, which is
standard for aircraft systems .
4. An aircraft is flying at a constant indicated altitude over a warm airmass. How will the
true altitude compare to the indicated altitude?
, A. It will be correct.
B. It will be greater than the real altitude.
C. It will be less than the real altitude.
D. It will be oscillating around the correct altitude.
🟢 C. It will be less than the real altitude.
🔴 RATIONALE: Over a warm airmass, the air density is lower than standard. The
altimeter, which is calibrated for ISA conditions, will indicate a higher altitude than it is
actually at. To be precise, the altimeter reading will be greater than the true altitude.
Since the question asks how true altitude compares to indicated, true altitude is less
than indicated .
5. What is the function of the outflow valve in a pressurization system?
A. To regulate the flow of conditioned air into the cabin.
B. To control the cabin pressure by modulating the amount of air exhausted overboard.
C. To provide emergency pressure relief in case of a system failure.
D. To shut off the air supply to the packs in case of a fire.
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE
2026/2027
SECTION ONE: QUESTIONS 1-100
1. What is the primary design philosophy that assumes an aircraft structure has a finite
safe life, and components must be retired or replaced after a predetermined period of
operation?
A. Fail-safe design
B. Damage-tolerant design
C. Safe-life design
D. Redundancy design
🟢 C. Safe-life design
🔴 RATIONALE: Safe-life design assumes a finite operational life for a component. Once
,the calculated safe life is reached, the part must be retired, regardless of its physical
appearance, to prevent catastrophic failure due to undetected fatigue. Fail-safe and
damage-tolerant designs are different approaches that allow for continued safe
operation after a failure .
2. Which of the following is a correct statement regarding the effects of a rearward (aft)
Centre of Gravity (CG) position?
A. It increases longitudinal stability.
B. It decreases cruise performance due to increased induced drag.
C. It increases the aircraft's stalling speed.
D. It improves controllability but may reduce stability.
🟢 D. It improves controllability but may reduce stability.
🔴 RATIONALE: A rearward CG reduces longitudinal stability because the distance
between the CG and the tailplane is decreased. However, it generally improves
controllability and reduces drag, as less tail-down force is required for balance. Stability
may be impaired to the point of being uncontrollable, but the primary concern is
reduced stability margins .
,3. In a large transport aircraft, what is the primary purpose of the constant speed drive
(CSD) unit in an electrical generation system?
A. To convert AC power to DC power for the aircraft's essential systems.
B. To maintain a constant rotational speed to the AC generator, ensuring a constant
frequency output.
C. To act as a backup starter motor for the engine.
D. To regulate the voltage output of the generator.
🟢 B. To maintain a constant rotational speed to the AC generator, ensuring a constant
frequency output.
🔴 RATIONALE: The CSD is a hydraulic-mechanical unit that ensures the AC generator is
driven at a constant speed (e.g., 12,000 RPM) regardless of the engine's varying RPM.
This is crucial for producing a constant frequency (e.g., 400 Hz) AC power, which is
standard for aircraft systems .
4. An aircraft is flying at a constant indicated altitude over a warm airmass. How will the
true altitude compare to the indicated altitude?
, A. It will be correct.
B. It will be greater than the real altitude.
C. It will be less than the real altitude.
D. It will be oscillating around the correct altitude.
🟢 C. It will be less than the real altitude.
🔴 RATIONALE: Over a warm airmass, the air density is lower than standard. The
altimeter, which is calibrated for ISA conditions, will indicate a higher altitude than it is
actually at. To be precise, the altimeter reading will be greater than the true altitude.
Since the question asks how true altitude compares to indicated, true altitude is less
than indicated .
5. What is the function of the outflow valve in a pressurization system?
A. To regulate the flow of conditioned air into the cabin.
B. To control the cabin pressure by modulating the amount of air exhausted overboard.
C. To provide emergency pressure relief in case of a system failure.
D. To shut off the air supply to the packs in case of a fire.
