PPL Aircraft General Knowledge
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Cheat sheet
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ExploreCommon mistakes
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ExploreAbout this exam
Aircraft General Knowledge (AGK) is one of the theoretical knowledge subjects a candidate must pass before being issued a Private Pilot Licence (PPL). It sits alongside subjects such as air law, meteorology, navigation and human performance, and it underpins the practical flying training because almost every pre-flight decision - fuel, mass, performance, systems, instrument interpretation - depends on it. The subject is aimed at ab-initio private pilots flying light single-engine aeroplanes, and it rewards candidates who can connect textbook theory to the aircraft they actually fly.
The syllabus is conventionally organised into six areas: airframe, systems and powerplant; mass and balance; performance; flight planning and monitoring; aircraft instruments; and electrics and electronics. Expect questions that mix recall (what a component does, what a gauge indicates) with applied calculation (centre of gravity position, take-off and landing distance, fuel and endurance, electrical loads). Calculation questions are usually the ones candidates lose marks on, so practise them with the actual aircraft data you will use in flight.
Preparation works best in layers: learn the airframe and powerplant fundamentals first, because instruments, electrics and performance all build on them; then mass and balance and performance as calculation topics; then flight planning, which draws everything together. Work through your training organisation's approved syllabus and the current official publications, and check examination administration details directly with the UK Civil Aviation Authority, since published pages are revised. This page offers independent practice material only and is not affiliated with, or endorsed by, any authority or training organisation.
What you'll study
About PPL Aircraft General Knowledge preparation
What is the Aircraft General Knowledge exam for?
It is a theoretical knowledge examination forming part of the Private Pilot Licence ground school. Passing it demonstrates you understand the aeroplane's structure, systems, powerplant, loading, performance, instruments and electrics well enough to make sound pre-flight and in-flight decisions as a private pilot.
What format are the questions?
The examination is multiple choice. Each question has one correct answer and several distractors, and some questions require a short calculation using supplied aircraft or atmospheric data. Practise reading each stem carefully, because distractors are often the answer to a slightly different question.
How many questions are there and how long do I get?
We cannot state this reliably. The official pages that would carry the current examination structure, timing and pass mark were unavailable when this page was last checked, so no figures are published here. Confirm the current arrangements with the UK Civil Aviation Authority or your training organisation before you book.
What pass mark do I need?
The pass standard is not stated here because it could not be verified from an official source at the time of writing. Pass marks are set by the licensing authority and can change, so check the current requirement directly with the authority or your examination centre rather than relying on second-hand figures.
How difficult is the exam?
Most candidates find the descriptive material manageable and the numerical material harder. Mass and balance, performance and flight planning questions punish careless arithmetic and unit errors more than lack of knowledge. If you can do those calculations repeatedly without reference notes, the exam becomes predictable rather than difficult.
If I fail, can I retake it?
Retake rules, waiting periods and any limit on the number of attempts are set by the licensing authority and were not verifiable from the sources available here. Ask your training organisation or the authority about the current policy before sitting the exam, and build in time for a possible resit.
In what order should I study the topics?
Start with airframe, systems and powerplant, since instruments, electrics and performance all depend on that foundation. Add mass and balance and performance next, treating them as calculation practice. Finish with flight planning and monitoring, which combines fuel, mass, performance and weather into one practical routine.
What are the most common mistakes?
Unit confusion in calculations, forgetting to convert between litres, kilograms and pounds, misplacing the centre of gravity by using the wrong datum, and misreading instrument questions that hinge on one word such as indicated versus true. Also common: memorising definitions without being able to apply them to a described scenario.
How should I prepare in the final weeks?
Work through timed mixed sets rather than topic-by-topic blocks, and review every wrong answer down to the underlying principle. Re-do calculation questions with your own aircraft's figures. Keep a one-page summary of formulae and definitions, and check the current official syllabus and examination arrangements before the test.