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EASA Part-66 Exam Preparation
UK CAA Part-66 Compatible Australia CASA Part 66
Updated to EU 2023/989
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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.

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16. Piston engine

In a two-stroke engine, one power stroke per revolution (360 degrees) gives higher power-to-weight than four-stroke.

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Recent Q&A Activity

P

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

A

seguridadaerea.gob.es/sites/default/f... PAGE 13 3 months , (90 days) before licence expires.

ALEX LORENCIO asked a question ·8h ago

L

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

G

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

S

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

J

The PT6 starts with the blades in feather?

JayACA asked a question ·11d ago

P

Hello. Indeed, moved to module 2.

PART66Online replied to Tj Anderson's question ·16d ago

T

why is this here (coming from CASA system) this is a buit random

Tj Anderson asked a question ·16d ago

M

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

C

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

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