EASA Part66
Module 12
Cats A3 · A4 · B1.3 · B1.4
Helicopter Aerodynamics, Structures & Systems EASA Part66 — Module 12 Practice Questions
Module 12 is the helicopter-specific counterpart to Module 11, sat only by rotary-wing licence candidates. It covers rotor aerodynamics, swashplate and tail-rotor control, main gearbox and freewheel units, airframe construction and the systems that keep a helicopter airborne. Seven sample questions sit below.
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What Module 12 covers — in plain English
Module 12 of the EASA Part66 syllabus is the helicopter-only sister of Module 11 and is examined exclusively
for the rotary-wing licence categories: A3, A4, B1.3 and B1.4. Candidates working towards a
fixed-wing licence (A1, A2, B1.1, B1.2, B2) do not sit this paper. The module is large — covering rotor
aerodynamics, swashplate control, main and tail gearboxes, airframe construction, and every aircraft system
from hydraulics and fuel to fire protection, electrical power and avionics — which is why the B1 exam runs
to 128 questions over 160 minutes.
The hardest sections at first sitting tend to be the aerodynamics theory (12.1) and the transmission and rotor
head chapters (12.4 and 12.5). Rotary-wing physics has no equivalent in fixed-wing training, so candidates
often arrive without intuition for gyroscopic precession, dissymmetry of lift, translational lift,
autorotation or vortex ring state. Add the mechanical complexity of a freewheel unit, sprag clutch,
elastomeric rotor head bearings and a multi-stage main gearbox, and the volume of new vocabulary alone
catches many candidates out.
Category A3/A4 candidates sit a shorter paper (100 questions, 125 minutes) at knowledge level 1 or 2 across
most sections — broadly recognition and basic explanation. B1.3 and B1.4 candidates sit the full
knowledge level 3 paper on the bulk of the systems (flight controls, transmissions, hydraulics,
fuel, fire, electrical, instruments, landing gear and lights), meaning they must be able to diagnose, apply
and describe operation in detail. The full per-section knowledge level breakdown is on our
Module 12 syllabus page.
These samples are drawn from our live Module 12 question bank of 1 281 questions. The full
timed practice quiz draws 128 questions per attempt (or 100 for Cat A), scored against the official EASA 75 % pass mark, with weak-area tracking across attempts.
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Ready for the full Module 12 timed practice quiz?
Sign up, pick Module 12 from the dashboard, and take a timed exam drawn from our
1 281-question bank — the number of questions follows your licence category (100 for Cat A,
128 for B1/B2/B2L/B3). Your score is tracked across attempts and we surface
your weakest sub-topics so revision time pays off.