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2026 Statistics

Key Facts: EASA Module 8 Exam

24 questions

Module 8 Exam Length

Regulation (EU) 2023/989

30 minutes

Time Allowed

Regulation (EU) 2023/989

75%

Pass Mark per Module

EASA Part-66

15 degC, 1013.25 hPa

ISA Sea-Level Datum

International Standard Atmosphere

36,090 ft

ISA Tropopause Altitude

International Standard Atmosphere

12 June 2024

Regulation 2023/989 Applicable

European Commission

3 attempts

Max Consecutive Sittings

EASA Part-66 examination rules

EASA Part-66 Module 08 Basic Aerodynamics is a basic-knowledge module for the European aircraft maintenance licence (Cat A, B1, B2, B3), sat at a National Aviation Authority or approved Part-147 organisation. The real exam is closed-book multiple choice with three options per question, about 75 seconds each, and a 75% pass mark. Under Commission Implementing Regulation (EU) 2023/989 (applicable 12 June 2024) Module 8 is 24 questions in 30 minutes for every category, and contains no essay. Content spans the physics of the atmosphere (ISA: 15 degC, 1013.25 hPa, 1.98 degC/1000 ft lapse, tropopause 36,090 ft at -56.5 degC, density and humidity effects); aerodynamics (boundary layer, laminar/turbulent flow, Bernoulli/venturi, lift generation, aerofoil geometry); lift, drag and the polar curve (induced, parasite and profile drag); theory of flight (lift/drag/AoA, glide, turns, load factor, stall and spin awareness); and flight stability (longitudinal, lateral and directional, dihedral and sweepback). Pre-2024 courses must finish under the old standard by 12 June 2026.

Sample EASA Module 8 Practice Questions

Try these sample questions to test your EASA Module 8 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the International Standard Atmosphere (ISA), what is the sea-level air temperature and pressure?

A.15 °C and 760 hPa

B.0 °C and 1000 hPa

C.15 °C and 1013.25 hPa

D.25 °C and 1013.25 hPa

Explanation: The ISA datum defines mean sea-level conditions as 15 °C (288.15 K) and 1013.25 hPa (29.92 in Hg). These reference values are used to standardise aircraft performance and instrument calibration.

2In the ISA, what is the temperature lapse rate in the troposphere up to the tropopause?

A.1.98 °C per 1000 ft

B.3.00 °C per 1000 ft

C.0.65 °C per 1000 ft

D.6.50 °C per 1000 ft

Explanation: ISA temperature falls at approximately 1.98 °C (commonly rounded to 2 °C) per 1000 ft, equivalent to 6.5 °C per 1000 m, up to the tropopause.

3At what approximate altitude does the ISA tropopause occur, and what temperature remains constant above it?

A.36,090 ft, -40 °C

B.11,000 ft, -40 °C

C.36,090 ft, -56.5 °C

D.50,000 ft, -56.5 °C

Explanation: In the ISA the tropopause is set at 36,090 ft (about 11,000 m), where the temperature reaches -56.5 °C and then stays constant through the lower stratosphere.

4How does air density change as altitude increases in the standard atmosphere?

A.It first decreases then increases

B.It increases linearly

C.It decreases

D.It remains constant

Explanation: As altitude rises, both pressure and temperature fall in a manner that produces a net decrease in air density. Lower density reduces engine power and aerodynamic force for a given speed.

5What effect does increasing humidity have on air density at a constant temperature and pressure?

A.It only affects density above 10,000 ft

B.It increases air density

C.It decreases air density

D.It has no effect on density

Explanation: Water vapour molecules are lighter than the nitrogen and oxygen molecules they displace, so humid air is less dense than dry air at the same temperature and pressure. This reduces lift and engine performance.

6What is meant by 'density altitude'?

A.The altitude at which density equals sea-level density

B.The altitude shown on the altimeter set to 1013 hPa

C.Pressure altitude corrected for non-standard temperature

D.The height of the tropopause on a given day

Explanation: Density altitude is pressure altitude corrected for temperature deviation from ISA. On a hot day the density altitude is higher than the pressure altitude, degrading aircraft performance.

7Atmospheric pressure with increasing altitude:

A.Decreases exponentially

B.Decreases linearly

C.Increases exponentially

D.Remains constant up to the tropopause

Explanation: Because air is compressible, most of the atmosphere's mass lies near the surface, so pressure falls off exponentially with height rather than at a constant linear rate.

8Relative humidity is best defined as:

A.The mass of dry air relative to moist air

B.The total mass of water in a given volume of air

C.The ratio of the actual water-vapour content to the maximum the air can hold at that temperature

D.The temperature at which dew forms

Explanation: Relative humidity expresses, as a percentage, how much water vapour the air holds compared with the maximum it could hold at the same temperature. At 100 % the air is saturated.

9The dew point is the temperature at which:

A.The air becomes fully saturated and condensation begins

B.The air density equals ISA density

C.Ice crystals melt

D.Relative humidity drops to zero

Explanation: The dew point is the temperature to which air must be cooled, at constant pressure, for it to reach 100 % relative humidity and begin condensing water vapour.

10What does Bernoulli's theorem state about a streamline of incompressible flow?

A.Density increases wherever velocity increases

B.Total pressure equals dynamic pressure minus static pressure

C.As the velocity of a fluid increases, its static pressure decreases

D.As the velocity of a fluid increases, its static pressure increases

Explanation: Bernoulli's principle states that for steady incompressible flow the sum of static and dynamic pressure (total pressure) is constant, so where velocity rises the static pressure must fall. This explains the low pressure over a cambered wing upper surface.

About the EASA Module 8 Exam

EASA Part-66 Module 08 Basic Aerodynamics is a foundation-knowledge module for the European aircraft maintenance licence (Categories A, B1, B2 and B3). It covers the physics of the atmosphere, aerodynamics, theory of flight, and flight stability and dynamics. The examination is a closed-book multiple-choice paper sat at a National Aviation Authority or an approved Part-147 maintenance training organisation. Under Commission Implementing Regulation (EU) 2023/989, applicable from 12 June 2024, Module 8 comprises 24 multiple-choice questions in 30 minutes for all licence categories.

Questions

24 scored questions

Time Limit

30 minutes

Passing Score

75%

Exam Fee

Varies by NAA / Part-147 organisation (approx. EUR 50-230 per module sitting) (European Union Aviation Safety Agency (EASA); examinations sat at National Aviation Authorities or approved Part-147 organisations)

EASA Module 8 Exam Content Outline

20%

Physics of the Atmosphere

International Standard Atmosphere with its sea-level datum (15 degC, 1013.25 hPa) and 1.98 degC per 1000 ft lapse rate to the tropopause at 36,090 ft / -56.5 degC, exponential pressure decrease, density variation with altitude and temperature, humidity, relative humidity and dew point, and density altitude and its effect on performance

20%

Aerodynamics and Airflow

Airflow around a body, the boundary layer and the no-slip condition, laminar versus turbulent flow and transition, free stream and relative airflow, upwash, downwash and tip vortices, stagnation point, and aerofoil geometry including camber, chord, mean aerodynamic chord, aspect ratio, fineness ratio, wash-in and washout

27%

Lift and Drag

Bernoulli's theorem and the venturi effect, generation of lift, the lift equation L = CL x 1/2 rho V^2 x S, lift coefficient and CLmax, angle of attack and centre-of-pressure movement, drag types (induced, parasite, profile, interference, ground effect and winglets), and the polar curve and maximum lift/drag ratio

20%

Theory of Flight

Relationship of lift, weight, thrust and drag in steady flight; glide ratio and steady-state performance; theory of the turn; load factor and its square-root effect on stall speed; the flight envelope (V-n diagram) and structural limits; stall causes, symptoms, washout and high-lift devices; and spin awareness

13%

Flight Stability and Dynamics

Static and dynamic stability about the three axes; longitudinal (pitch) stability from the tailplane; lateral (roll) stability from dihedral and sweepback; directional (yaw) stability from the fin; centre-of-gravity influence on longitudinal stability; positive, neutral and negative stability; and Dutch roll

How to Pass the EASA Module 8 Exam

What You Need to Know

Passing score: 75%
Exam length: 24 questions
Time limit: 30 minutes
Exam fee: Varies by NAA / Part-147 organisation (approx. EUR 50-230 per module 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 Module 8 Study Tips from Top Performers

1Memorise the ISA datum: 15 degC and 1013.25 hPa at sea level, a lapse rate of 1.98 degC per 1000 ft, and a tropopause at 36,090 ft where the temperature is a constant -56.5 degC

2Learn the lift equation L = CL x 1/2 rho V^2 x S and remember that lift and drag both vary with the square of true airspeed, so doubling speed quadruples the force

3Understand that induced drag is greatest at low speed (high angle of attack) while parasite drag rises with speed; total drag is minimum, and lift/drag ratio maximum, where the two are equal

4Know that the aircraft always stalls at the same critical angle of attack (about 15-16 degrees), but stall speed rises with the square root of load factor, so a 2g turn raises it by about 1.41 times

5Distinguish the three axes of stability: longitudinal (pitch) from the tailplane, lateral (roll) from dihedral and sweepback, and directional (yaw) from the vertical fin

6Remember that washout sets the tip at a lower incidence than the root so the root stalls first, keeping the ailerons effective at the onset of the stall

Frequently Asked Questions

What does EASA Part-66 Module 8 cover?

Module 8 Basic Aerodynamics covers four areas: physics of the atmosphere (the International Standard Atmosphere, pressure, density and humidity), aerodynamics (airflow, boundary layer, Bernoulli and aerofoil geometry), theory of flight (lift, drag, stall, turns and load factor), and flight stability and dynamics.

How many questions are on the Module 8 exam and what is the pass mark?

Under Commission Implementing Regulation (EU) 2023/989, applicable from 12 June 2024, Module 8 has 24 multiple-choice questions to be answered in 30 minutes for all licence categories (A, B1, B2 and B3). The pass mark is 75%, and there is no essay in Module 8.

How many answer options does the real Module 8 exam use?

The official EASA Part-66 examination uses three-option multiple-choice questions, allowing about 75 seconds per question. This OpenExamPrep practice bank uses four options per question to give you tougher practice and a wider range of distractors.

Where do I sit the EASA Module 8 examination?

Module 8 is examined at a National Aviation Authority (NAA) or at an approved Part-147 maintenance training organisation. Fees vary by provider, typically around EUR 50-230 per module sitting. A maximum of three consecutive attempts is allowed, with a 90-day wait after a third failure.

What changed with the 2023/989 regulation in June 2024?

Commission Implementing Regulation (EU) 2023/989, applicable from 12 June 2024, merged former sub-modules (for example 7A/7B into 7 and 11A/11B/11C into 11), raised Module 8 to 24 questions in 30 minutes, and removed essays from Modules 9 and 10 (essays remain only in Module 7).

Is the UK CAA syllabus the same as EASA Module 8?

Since Brexit the UK CAA has diverged from EASA in some areas, so a UK Part-66 syllabus may differ. This practice bank is written to the current EASA standard under Regulation (EU) 2023/989; confirm the exact requirements with your own competent authority.

How long should I study for Module 8?

Most candidates spend around 40-60 hours on Module 8. Focus on memorising the ISA values, the lift and drag equations, the difference between induced and parasite drag with speed, the critical angle of attack and stall behaviour, and the three axes of stability.

100+ Free EASA Module 8 Practice Questions

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