SimplyATPL › 021 Airframe, Systems and Powerplant
Aircraft General Knowledge (021) covers how a transport aeroplane is built and powered: structure and loads, hydraulics, landing gear and brakes, flight controls, pressurisation and air conditioning, ice protection, fuel, electrics, piston and turbine engines, fire protection and oxygen.
Free, no sign-up. The practice paper uses the question count and time limit from CAA guidance for this subject. Check the CAA for the current figures before your exam.
It is one of the largest papers, so steady coverage beats deep dives on a few topics. Many questions ask what happens when a component fails or a valve is in a given position, which needs an understanding of how each system is laid out.
In the practice desk you can sit a full 80-question paper under exam conditions, or drill one syllabus topic at a time. Questions you miss come back after 1, 3, 7, 16 and 35 days, so weak areas get repeated until they stick.
Every topic below has practice questions, and you can drill any of them on its own.
Five questions from the bank. Each one in the practice desk has a worked explanation like these.
Answer: C. One replaced after a set life, before fatigue cracks can form
Answer: D. The stringers and longerons, with the skin
Frames keep the shape.
Answer: A. To store energy and damp pressure surges
It also provides pressure for emergency use.
Answer: B. It is inert and does not support combustion
It also contains no moisture.
Answer: A. Aerodynamic loads no longer reach the pilot
Without feel the pilot could overstress the aircraft.