Master Principles of Flight for your ATPL theory exam
Free practice questions covering lift and drag theory, aerofoil design, boundary layer behaviour, stall and spin recovery, static and dynamic stability, high-lift devices, transonic aerodynamics and Dutch roll — with detailed explanations for every answer.
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Topics covered in this question bank
All major Principles of Flight topic areas from the EASA ATPL syllabus, from subsonic lift theory to transonic shock wave formation.
Drag components and how they vary with airspeed
Understanding how different drag types behave with airspeed is fundamental to performance questions and directly tested in the exam. Total drag has a characteristic U-shape with a minimum at the speed for best glide ratio (L/Dmax).
| Drag Type | Also Called | Varies With Speed | Reduced By |
|---|---|---|---|
| Induced drag | Vortex drag / drag due to lift | Decreases with speed (∝ 1/V²) | High aspect ratio, winglets, lower CL |
| Profile drag | Parasite drag (form + skin friction) | Increases with speed (∝ V²) | Streamlining, smooth surfaces, retracted gear |
| Wave drag | Compressibility drag | Appears above Mcrit; rises steeply | Swept wings, supercritical aerofoils, area rule |
| Interference drag | Junction drag | Related to geometry, not speed directly | Fairings at wing-fuselage junctions |
| Total drag | — | Minimum at VMD (best glide speed) | Optimise between induced & profile drag |
What to expect on the real exam
Principles of Flight questions test conceptual understanding rather than calculation. The exam frequently asks about cause-and-effect relationships: what happens to induced drag if aspect ratio increases, what causes Dutch roll, why does a swept wing stall at the tip first, what is the effect of deploying flaps on stall speed. Diagrams and graphs (CL vs angle of attack, drag polar, lift curve) are described in text form — practice interpreting them.
Why Principles of Flight underpins all other ATPL subjects
Principles of Flight is the theoretical foundation of aviation. Concepts learned here — how lift is generated, how drag behaves, how aircraft respond to disturbances — directly support Performance, Mass and Balance, and General Navigation. A strong understanding of aerodynamics makes every other ATPL subject more intuitive.
Questions are aligned with the EASA ATPL Principles of Flight (Aeroplane) syllabus and cover the complete range from basic four-forces theory to high-speed compressibility effects, coupled lateral-directional dynamics and high-lift device aerodynamics.
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