EASA Part 66 · Module 16
Module 16: Piston EngineEASA Part 66 practice questions & answers
Piston aero-engines and their systems — construction, fuel, ignition, cooling, lubrication and installation.
- A worked explanation on every question
- Timed mock exam at the official length
- Read in English or 15 other languages
Sample Module 16 questions with answers
Three questions from the free preview. Think of your answer first, then open the explanation.
1.A bent cooling fin on an aluminium cylinder head?
- A.Should be stop drilled or a small radius filed at the point of the bend
- B.Should be sawed off and filed smooth
- C.Should be left alone if no crack has formed
Show answer and explanation
Correct answer: C. Should be left alone if no crack has formed
Aluminium cooling fins are fairly ductile; a bend alone doesn't significantly reduce fin strength or cooling area, so no repair action is needed unless the fin has actually cracked.
2.A carburetor is prevented from leaning out during quick acceleration by the?
- A.Mixture control system
- B.Power enrichment system
- C.Accelerating system
Show answer and explanation
Correct answer: C. Accelerating system
The accelerating system injects a shot of extra fuel the instant the throttle opens quickly, offsetting the momentary lag in the main metering system so the mixture doesn't go lean and cause a stumble.
3.A certain nine cylinder radial engine used a non compensated single unit, dual type magneto with a four pole rotating magnet and separately mounted distributors. Which of the following will have the lowest RPM at any given engine speed?
- A.Breaker cam
- B.Engine crankshaft
- C.Distributors
Show answer and explanation
Correct answer: C. Distributors
The distributor is geared down to fire once per cylinder per engine cycle, so it turns at half crankshaft speed — slower than both the crankshaft and the magneto's breaker cam.
About this module
EASA Part 66 Module 16 covers piston aero-engines for the B1.2 and B1.4 licences: the four-stroke cycle and engine performance, construction, carburettors and fuel injection, magneto ignition, cooling and exhaust, supercharging, lubrication, indications, installation and preservation.
Questions centre on classic piston theory — valve timing, mixture and detonation, magneto checks, oil-system behaviour — the kind of material that rewards steady, repeated practice with clear explanations.
What this module covers
Piston aero-engines and their systems — construction, fuel, ignition, cooling, lubrication and installation. The powerplant module for the light-aircraft B1.2 and B1.4 licences. Topics below follow the official EASA Part 66 syllabus.
- Fundamentals
- Engine performance
- Engine construction
- Engine fuel systems
- Starting and ignition systems
- Induction, exhaust and cooling
- Supercharging and turbocharging
- Lubricants and fuels
- Lubrication systems
- Engine indication systems
- Powerplant installation
- Engine monitoring and ground operation
- Engine storage and preservation
How long is the Module 16 exam?
| Licence category | Questions | Time |
|---|---|---|
| A2, A4 | 52 | 65 min |
| B1.2, B1.4, B3 | 76 | 95 min |
Multiple choice with three options, a 75% pass mark and no negative marking, as set in Appendix II to Part-66. More about EASA Part 66 →