100+ Free EASA ATPL 021 AGK Practice Questions
Pass your EASA ATPL Theory - Aircraft General Knowledge: Airframe, Systems, Electrics and Powerplant (021) exam on the first try — instant access, no signup required.
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Key Facts: EASA ATPL 021 AGK Exam
80 questions
Exam length for subject 021
EASA AMC1 FCL.025 examination structure
2 hours
Time allowed for 021
EASA AMC1 FCL.025 examination structure
75%
Pass mark per ATPL subject
EASA Part-FCL
13 subjects
ATPL(A) theory exams after 090 Communications merge
EASA ED Decision 2019/017/R
18 months
Window to pass all ATPL theory subjects
EASA FCL.025
4 attempts / 6 sittings
Maximum attempts per subject and total sittings
EASA FCL.025
7 years
Validity of ATPL theory passes for licence issue
EASA Part-FCL
EASA ATPL 021 Aircraft General Knowledge (Airframe, Systems, Electrics, Powerplant) is one of 13 ATPL(A) theory exams. It is computer-based at a National Aviation Authority test centre: 80 single-best-answer multiple-choice questions in 2 hours, no negative marking, with a 75% pass mark. Questions come from the European Central Question Bank (current ECQB 2026 release, built on the 2020 syllabus). Content spans airframe structures, loads and the 1.5 safety factor, fail-safe and damage-tolerant design; hydraulics (3,000/5,000 psi, pumps, accumulators, PTU); landing gear, wheels, tyres and anti-skid brakes; primary/secondary flight controls and fly-by-wire control laws; pneumatics, air-cycle air conditioning and pressurisation; ice and rain protection; fuel systems; AC/DC electrics (115 V 400 Hz, IDG, TRU, batteries); piston engines (mixture, magnetos, propellers); turbine engines (EPR, EGT, N1/N2, compressor stall, thrust reverser, FADEC); the APU; and emergency equipment including oxygen, fire detection/extinguishing and GPWS. Under FCL.025, candidates have up to 4 attempts per subject, 6 sittings, and must pass all subjects within 18 months.
Sample EASA ATPL 021 AGK Practice Questions
Try these sample questions to test your EASA ATPL 021 AGK exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1A structure designed so that, after the failure of a single principal structural member, the remaining structure can carry the limit load without catastrophic failure, is described as:
2The limit load of an aircraft structure is defined as:
3In a semi-monocoque fuselage construction, the primary purpose of the longerons and stringers is to:
4Aircraft fatigue life is most directly affected by:
5In a hydraulic system, the component that converts hydraulic pressure into linear mechanical motion to move a flight control or landing gear is the:
6The main purpose of a hydraulic accumulator is to:
7A large modern transport aircraft hydraulic system typically operates at a nominal pressure of:
8Which type of hydraulic fluid is most commonly used in large transport aircraft because of its fire resistance?
9An anti-skid braking system protects against a locked wheel by:
10A fusible plug fitted in a wheel hub is designed to:
About the EASA ATPL 021 AGK Exam
EASA ATPL(A) subject 021, Aircraft General Knowledge - Airframe, Systems, Electrics and Powerplant, is one of the 13 theoretical knowledge examinations required for the Airline Transport Pilot Licence (Aeroplanes). It is a computer-based multiple-choice exam of 80 questions in 2 hours, drawn from the European Central Question Bank (current release ECQB 2026). The subject covers aircraft structures and loads, hydraulics, landing gear and brakes, flight controls including fly-by-wire, pneumatics, air conditioning and pressurisation, ice and rain protection, fuel, electrics, piston and turbine engines, the APU and emergency equipment. A score of 75% is required to pass, with no negative marking.
Questions
80 scored questions
Time Limit
2 hours
Passing Score
75% per subject
Exam Fee
Varies by National Aviation Authority, approx EUR 60-130 per subject sitting (EASA via National Aviation Authorities (computer-based testing, commonly LPLUS TestStudio))
EASA ATPL 021 AGK Exam Content Outline
Airframe, Structures, Loads & Materials
System design, limit and ultimate loads with the 1.5 safety factor, semi-monocoque construction with stringers carrying axial loads and skin carrying shear and hoop stress, fatigue and pressurisation cycles, fail-safe, safe-life and damage-tolerant design philosophies, and aluminium alloys versus carbon composites
Hydraulics, Pneumatics, Air Conditioning & Pressurisation
3,000 and 5,000 psi hydraulic systems, variable-displacement pumps, accumulators and pre-charge, actuators, PTU and phosphate-ester (Skydrol) fluid, engine bleed air, air-cycle machine packs and water separators, outflow valve control, maximum differential pressure limits, negative pressure relief and the cabin altitude warning near 10,000 ft
Landing Gear, Wheels, Tyres, Brakes & Flight Controls
Oleo-pneumatic shock struts, sequence valves, hydraulic nosewheel steering, weight-on-wheels (squat) switches, anti-skid braking, fusible plugs and carbon multi-disc brakes, primary controls (aileron/elevator/rudder), secondary controls (flaps, slats, spoilers, trimmable stabiliser), mass balance and flutter, and fly-by-wire control laws and protections
Ice & Rain Protection and Fuel Systems
Thermal bleed-air leading-edge anti-ice versus pneumatic de-icing boots, electrical pitot/probe and windshield heat (also for bird-strike resistance), ice detectors, fuel tanks, centrifugal boost pumps, cross-feed, wing-bending relief fuel sequencing, the EU basic fuel scheme, fuel-tank inerting and water-contamination control
Electrics
AC and DC generation, 115 V 400 Hz, integrated drive generators and constant speed drives, transformer rectifier units, nickel-cadmium and lead-acid batteries with thermal-runaway awareness, essential/hot busbars and load shedding, circuit breakers, semiconductors and diodes, static inverter, ram air turbine and bonding/static dischargers
Piston & Turbine Powerplant
Four-stroke Otto cycle, mixture and altitude leaning, carburettor icing, magneto ignition, constant-speed and feathering propellers, gas-turbine architecture and twin-spool engines, high-bypass turbofan thrust, EPR, EGT, N1/N2, compressor stall/surge and variable vanes, thrust reverser, FADEC, oil systems and the APU
How to Pass the EASA ATPL 021 AGK Exam
What You Need to Know
- Passing score: 75% per subject
- Exam length: 80 questions
- Time limit: 2 hours
- Exam fee: Varies by National Aviation Authority, approx EUR 60-130 per subject sitting
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
EASA ATPL 021 AGK Study Tips from Top Performers
Frequently Asked Questions
How many questions are on the EASA ATPL 021 exam and how long is it?
Subject 021 Aircraft General Knowledge (Airframe, Systems, Electrics, Powerplant) has 80 single-best-answer multiple-choice questions and a time allowance of 2 hours. There is no negative marking, so it is best to answer every question.
What is the pass mark for ATPL 021?
The pass mark is 75%, the same as for all EASA ATPL theoretical knowledge subjects. You must achieve at least 75% in each of the 13 ATPL(A) theory subjects to complete the theory requirement.
What topics does ATPL 021 cover?
It covers airframe and structures, hydraulics, landing gear, wheels, tyres and brakes, flight controls including fly-by-wire, pneumatics, air conditioning and pressurisation, ice and rain protection, fuel systems, electrics, piston and turbine engines, the APU, and emergency equipment such as oxygen and fire protection. Instrumentation is a separate subject (022).
Is 021 the same as the Instrumentation exam (022)?
No. Aircraft General Knowledge is split into two separate exams: 021 covers airframe, systems, electrics and powerplant, while 022 covers instrumentation, automatic flight and electronic displays. They are sat as distinct papers.
How many attempts and how much time do I have to pass the ATPL theory exams?
Under FCL.025 you are allowed a maximum of 4 attempts per subject and 6 examination sittings overall, and you must pass all subjects within 18 months from the end of the calendar month of your first attempt.
How long are ATPL theory passes valid?
A completed set of ATPL(A) theoretical knowledge passes is valid for 7 years for the issue of an ATPL, counted from the validity of an instrument rating or the relevant licence as defined in Part-FCL.
What is the ECQB and which edition applies in 2026?
The European Central Question Bank (ECQB) is the common pool of exam questions used across EASA states. The current release is ECQB 2026, a content refresh built on the 2020 ATPL learning-objective syllabus, so question counts and durations are unchanged.