100+ Free EASA Module 16 Practice Questions
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Key Facts: EASA Module 16 Exam
76 questions
Module 16 exam (B1.2/B1.4/B3)
EASA Part-66 examination standard
95 minutes
Time allowed (B1.2/B1.4/B3)
EASA Part-66 examination standard
75%
Pass mark per module
EASA Part-66
3 options
Real exam multiple-choice format
EASA Part-66 examination standard
100LL is blue
AVGAS grade colour code
ASTM D910 / industry standard
12 June 2024
Regulation (EU) 2023/989 applicable date
Commission Implementing Regulation (EU) 2023/989
EASA Part-66 Module 16 (Piston Engine) is sat by aircraft maintenance licence candidates on the A2/A4, B1.2, B1.4 and B3 paths. The B1.2/B1.4/B3 paper is 76 three-option multiple-choice questions in 95 minutes (A2/A4: 52 questions, 65 minutes), with a 75% pass mark per module and roughly 75 seconds per question - no essays in Module 16. Content spans fundamentals (Otto four-stroke, two-stroke and diesel principles, compression ratio, displacement, efficiencies, firing order), engine performance (power, mixtures, leaning, detonation versus pre-ignition, altitude effects), construction (crankcase, crankshaft, camshaft, cylinders, pistons, valves, reduction gearbox), fuel systems (carburettors, icing, injection, FADEC), starting and ignition (magnetos, timing, plugs, impulse coupling), induction/exhaust/cooling, supercharging and turbocharging (wastegate, critical altitude), lubricants and fuels (AVGAS grades, oils), lubrication systems, engine indication, installation, ground operation and storage preservation. The syllabus follows Regulation (EU) 2023/989, applicable 12 June 2024; pre-2024 courses must finish under the old standard by 12 June 2026.
Sample EASA Module 16 Practice Questions
Try these sample questions to test your EASA Module 16 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1In the four-stroke Otto cycle, during which stroke does the inlet valve open to admit the fuel/air charge into the cylinder?
2A cylinder has a total volume of 1000 cm3 with the piston at BDC and a clearance (combustion chamber) volume of 100 cm3 with the piston at TDC. What is the compression ratio?
3Which efficiency expresses the ratio of brake horsepower delivered at the propeller shaft to the indicated horsepower developed in the cylinders?
4What is the firing order of a typical horizontally-opposed six-cylinder Lycoming aircraft engine (cylinders numbered 1-2-3-4-5-6)?
5In a two-stroke engine, one complete power cycle is produced for every:
6Compared with the petrol Otto engine, the aircraft compression-ignition (diesel) engine ignites its fuel by:
7Volumetric efficiency of a normally-aspirated piston engine is best described as the:
8The swept (piston displacement) volume of a single cylinder is calculated from:
9During the valve overlap period of a four-stroke engine, near top dead centre at the end of the exhaust stroke:
10Thermal efficiency of a piston engine is most strongly increased by:
About the EASA Module 16 Exam
EASA Part-66 Module 16 (Piston Engine) is the powerplant knowledge module for aircraft maintenance engineers seeking a Category A2/A4, B1.2, B1.4 or B3 licence. It tests piston-engine fundamentals, construction and supporting systems - from the Otto four-stroke cycle and compression ratio through carburettors, fuel injection, magneto ignition, cooling, supercharging, lubrication, AVGAS, engine indication and ground operation. Examinations are three-option multiple-choice with a 75% pass mark per module, sat at a National Aviation Authority or an approved Part-147 organisation. The current syllabus follows Commission Implementing Regulation (EU) 2023/989, applicable from 12 June 2024.
Questions
76 scored questions
Time Limit
95 minutes (B1.2/B1.4/B3); 65 minutes for A2/A4
Passing Score
75% per module
Exam Fee
Approx. EUR 50-230 per module sitting (varies by NAA / Part-147 organisation) (EASA - examinations sat at National Aviation Authorities or approved Part-147 maintenance training organisations)
EASA Module 16 Exam Content Outline
Fundamentals, Cycles & Performance
Otto four-stroke and two-stroke/diesel principles, compression ratio and piston displacement, mechanical/thermal/volumetric efficiency, firing order, mixtures and leaning, detonation versus pre-ignition, and altitude and manifold-pressure effects
Engine Construction
Crankcase, crankshaft and counterweights/dampers, camshaft and valve mechanism with overlap and tappet clearance, cylinders, pistons and rings, connecting rods and plain bearings, accessory gearbox and propeller reduction gearbox
Fuel Systems
Float and pressure carburettors, venturi and float chamber, accelerator pump and economiser, carburettor refrigeration icing and carb heat, continuous-flow and pressure fuel injection, flow divider, mixture/idle cut-off and piston FADEC
Starting & Ignition
Magneto principle and E-gap, dual ignition and spark-plug heat range, ignition timing before TDC, impulse coupling for starting, P-lead earthing and the live-magneto hazard, magneto-to-engine timing and starter motor drives
Induction, Exhaust, Cooling & Supercharging
Induction and alternate/hot air, air and liquid cooling with baffles, cowl flaps and thermostat, exhaust heat-exchanger and carbon-monoxide risk, backfire/afterfire, superchargers, turbochargers, wastegate, critical altitude and intercoolers
Lubrication, Fuels, Indication & Operation
Wet and dry sump systems, pressure relief valve and oil-cooler thermostat, chip detectors, AVGAS grades and octane rating, multigrade oils, RPM/MAP/CHT/EGT and oil gauges, differential compression tests, run-up checks, trend monitoring and storage preservation
How to Pass the EASA Module 16 Exam
What You Need to Know
- Passing score: 75% per module
- Exam length: 76 questions
- Time limit: 95 minutes (B1.2/B1.4/B3); 65 minutes for A2/A4
- Exam fee: Approx. EUR 50-230 per module sitting (varies by NAA / Part-147 organisation)
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 16 Study Tips from Top Performers
Frequently Asked Questions
What does EASA Part-66 Module 16 cover?
Module 16 (Piston Engine) covers piston-engine fundamentals, performance, construction and supporting systems: the Otto four-stroke cycle, compression ratio and displacement, carburettors and fuel injection, magneto ignition, induction, exhaust, cooling, supercharging and turbocharging, lubrication, AVGAS and oils, engine indication, installation, ground operation and storage preservation.
How many questions are on the Module 16 exam and how long is it?
For Category B1.2, B1.4 and B3 the Module 16 examination is 76 multiple-choice questions in 95 minutes. For Category A2 and A4 it is 52 questions in 65 minutes. Each question allows roughly 75 seconds. The pass mark is 75% per module.
Are the real EASA exam questions multiple-choice?
Yes. EASA Part-66 module examinations use three-option multiple-choice questions, each with a single correct answer. Essays were retained only in Module 7 after the June 2024 changes. This practice bank uses four options to add learning depth.
What is the pass mark and how many attempts are allowed?
The pass mark is 75% for the module. Candidates may sit a module up to three consecutive attempts, with a 90-day waiting period after three failed attempts, in line with EASA Part-66 examination rules at the approved organisation or NAA.
Which syllabus edition should I study for 2026?
Study to Commission Implementing Regulation (EU) 2023/989, applicable from 12 June 2024. Pre-2024 courses must be completed under the old standard by 12 June 2026. Note that the UK CAA has diverged post-Brexit, so keep your study EASA-specific.
Why does carburettor icing happen even on warm days?
Fuel vaporisation and the venturi pressure drop can cool the induction charge by roughly 20-30 C. With humid air at ambient temperatures from about -7 C to +21 C, this cooling can freeze moisture into ice in the carburettor, reducing power even on a warm, humid day.