EASA Part-66 Exam Preparation Online
Practice with thousands of EASA Part-66 exam questions across all 17 modules, track your progress, and join a community of aviation maintenance engineers preparing for their licence. New to it? Read what EASA Part-66 is — the licence, modules and exams explained.
Every question explained: all 17,000+ EASA Part-66 questions come with a clear, regulation-grounded explanation shown the moment you answer — so you understand why, not just memorise the answer.
All content aligned with the latest Commission Implementing Regulation (EU) 2023/989 — covering categories A, B1, B2, B2L and B3. Also fully applicable to UK CAA Part-66 candidates — the UK keeps the same Part-66 modules, exams and 75% pass mark under UK Regulation (EU) No 1321/2014. UK CAA vs EASA → Valid prep for Australia's CASA Part 66 self-study exams too. CASA vs EASA →
Part-66 worldwide: the same module-based study also prepares you for Part-66-aligned exams in the UAE (GCAA CAR-66), Qatar (QCAR Part-66), Singapore (SAR-66), Hong Kong (HKAR-66) and India (DGCA CAR-66) and Kenya (KCAA), plus where EASA / UK-CAA Part-66 exams are sat locally in Egypt (ECAA) and Nigeria (NCAA).
Aircraft Type Training: practice question banks for the Airbus A320 (CEO & NEO), A220 and A330 and Boeing 737NG, 737 MAX and 787, organised by ATA chapter with worked answers and timed practice.
Fact of the Day
16. Piston engineIn a two-stroke engine, one power stroke per revolution (360 degrees) gives higher power-to-weight than four-stroke.
Study Modules
1. Mathematics
1062 questions
2. Physics
998 questions
3. Electrical fundamentals
1242 questions
4. Electronic fundamentals
876 questions
5. Digital techniques / Electronic instrument systems
1094 questions
6. Materials & hardware
1209 questions
7. Maintenance practices
1391 questions
8. Basic aerodynamics
1120 questions
9. Human factors
746 questions
10. Aviation legislation
500 questions
11. Aeroplane aerodynamics, structures and systems
2137 questions
12. Helicopter aerodynamics, structures and systems
1279 questions
13. Aircraft aerodynamics, structures and systems
955 questions
14. Propulsion
660 questions
15. Gas turbine engine
1377 questions
16. Piston engine
500 questions
17. Propeller
802 questions
Module 1
Mathematics
6 articles
Module 2
Physics
8 articles
Module 3
Electrical Fundamentals
18 articles
Module 4
Electronic Fundamentals
5 articles
Module 5
Digital Techniques / Electronic Instrument Systems
15 articles
Module 6
Materials and Hardware
16 articles
Module 7
Maintenance Practices
27 articles
Module 8
Basic Aerodynamics
4 articles
Module 9
Human Factors
10 articles
Module 10
Aviation Legislation
10 articles
Module 11
Aeroplane Aerodynamics, Structures and Systems
54 articles
Module 12
Helicopter Aerodynamics, Structures and Systems
22 articles
Module 13
Aircraft Aerodynamics, Structures and Systems
46 articles
Module 14
Propulsion
8 articles
Module 15
Gas Turbine Engine
22 articles
Module 16
Piston Engine
16 articles
Module 17
Propeller
7 articles
Unlock all study notes — €99.99 one-time
900+ pages, 17 modules, lifetime access. First paragraph of each module is free to preview.
EASA Part-145 Continuation Training
For licensed engineers — certificated safety training mapped to the AMC: Human Factors, Fuel Tank Safety, EWIS and Information Security (Part-IS).
"Get Compliant" - Initial Pack
Get first-time compliant on all three mandatory subjects
- Human Factors (incl. SMS) — Initial
- Fuel Tank Safety (CDCCL) — Initial
- EWIS (Target Groups 1-2) — Initial
"2-Year Refresh" - Continuation Pack
The 2-year refresh for all three mandatory subjects
- Human Factors (incl. SMS) — Continuation
- Fuel Tank Safety (CDCCL) — Continuation
- EWIS (Target Groups 1-2) — Continuation
Aircraft Type Training
Airbus A320 - CEO
43 ATA chapters · 4,451 questions
Airbus A320 - NEO
24 ATA chapters · 2,406 questions
Airbus A220 (BD500)
42 ATA chapters · 4,332 questions
Boeing 737NG
27 ATA chapters · 4,384 questions
Boeing 737NG to MAX Diff
30 ATA chapters · 3,194 questions
Airbus A320 to A330 Diff
23 ATA chapters · 2,392 questions
Boeing 787 (GEnx)
34 ATA chapters · 4,423 questions
Streak Challenge
Streak:
Loading question...
Correct!
Game Over!
streak
New Personal Best!
Personal best:
Today's Leaderboard
Streak Challenge
How many can you get right in a row?
Today's Top Streaks
1 played todayRecent Test Results
2. Physics
by antonnev10
12. Helicopter aerodynamics, structures and systems
by SamDevenish
2. Physics
by CharlesThe1st
17. Propeller
by Mauro Cantor
2. Physics
by CharlesThe1st
Leaderboards
Full rankingsTop Performers · by average quiz score
Not enough data for the podium yet.
Top Study Streaks · current active daily streaks
No active streaks today — start one!
Recent Q&A Activity
Good catch, and thanks for citing the source rather than just the number. You are right about the AESA guide, so I went and checked the rule itself. Part-66 does not set a submission window at all. Point 66.A.40 and point 66.B.120 require only that EASA Form 19 and your copy of the licence reach the competent authority that issued it, and AMC 66.B.120 adds no time limit either. The only 30, 60 and 90 day periods written into Annex III are the examination retake waiting periods, which is a different subject entirely. So the period is national, and it varies more than I expected. The UK CAA will not accept an application earlier than 60 days before expiry. Spain, the Netherlands and Finland all work to 3 months. Italy asks for at least one month and will still renew a licence that expired long ago. They are not even the same kind of rule, the UK figure is a ceiling and the Spanish one is a floor, so 60 days would actually be late for you. Question fixed. The 60 day option has been rep…
PART66Online replied to ALEX LORENCIO's question ·5h ago
seguridadaerea.gob.es/sites/default/f... PAGE 13 3 months , (90 days) before licence expires.
ALEX LORENCIO asked a question ·8h ago
Hey George, this one's tricky, you've got the correction running the wrong way round. It's 179, because a plus one deviation means the compass is reading one degree low, so when the aircraft is genuinely pointing at 180 the card in front of you shows 179, and that lower number is what you steer to. Same idea as a watch that runs a minute slow, if you need to be somewhere at 8 o'clock you set off when the watch says 7:59, you work to what the dial shows and not what you wish it showed. The memory line for it is deviation east, compass least, and a compass correction card would read for 180 steer 179, so that's how I'd read it.
Lisa_T replied to GEO9816's question ·1d ago
Hello , i am thinking that the correct answer in this question is 181 degrees .If the deviation is +1 dergee that means that if the compas heading to 181 degrees the arcraft goes heading 180 degrees ( 181 degrees - (+1) degree = 180 degrees). On the other hand if the pilot steer to 179 degree the compass will show 180 degree but the plane would travel too 179 degrees . Is this right or am i wrong to somehtink? thank you for your time , George
GEO9816 asked a question ·1d ago
Actually, C is correct for the general case, since a low blade angle presents the least air load and lets the engine accelerate to idle with minimum starter effort. On the PT6 the propeller is a free-turbine layout decoupled from the starter, and on most reversing installations it rests on the fine-pitch start locks rather than in feather, so C still applies.
svenj88 replied to JayACA's question ·11d ago
The PT6 starts with the blades in feather?
JayACA asked a question ·11d ago
Hello. Indeed, moved to module 2.
PART66Online replied to Tj Anderson's question ·16d ago
why is this here (coming from CASA system) this is a buit random
Tj Anderson asked a question ·16d ago
A. High fidelity means low distortion, Class A is most linear, Class C is efficient for RF but distorts too much for clean audio.
Marek_AME replied to udreacc's question ·26d ago
Why else would the cockpit indicator run off it as a synchronous motor if the tacho was not making AC? The aircraft tachogenerator is a 3 phase permanent magnet unit, so the output is a sinusoidal AC voltage whose frequency tracks the rpm, that is why it is sinusoidal even though the stem never says AC. Linear only describes voltage against speed, not the waveform, so it does not apply here.
carlosmd replied to udreacc's question ·26d ago