100+ Free Module 12 Practice Questions
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Key Facts: Module 12 Exam
75%
Pass Mark per Module
EASA Part-66
128 questions
B1.3/B1.4 Exam Length
EASA Part-66 Appendix II
160 minutes
B1.3/B1.4 Time Allowed
EASA Part-66 Appendix II
~75 seconds
Time per Question
EASA Part-66 examination standard
3 attempts
Maximum Consecutive Attempts
EASA Part-66 (90-day wait after the third fail)
12 June 2024
Regulation (EU) 2023/989 Applicable
Commission Implementing Regulation (EU) 2023/989
B1.3 / B1.4
Helicopter Licence Categories
EASA Part-66
EASA Part-66 Module 12 is the helicopter aerodynamics, structures and systems knowledge module for the B1.3 (turbine) and B1.4 (piston) aircraft maintenance licence categories, with a lighter syllabus for A3/A4. The B1.3/B1.4 exam is 128 multiple-choice questions in 160 minutes (A3/A4: 100 questions in 125 minutes), 3-option in the real exam, with a 75% pass mark and about 75 seconds per question. Content spans rotary-wing theory of flight (dissymmetry of lift, retreating blade stall, vortex ring state, Coriolis effect, autorotation, ground effect), flight control systems (cyclic, collective, anti-torque, swashplate, AFCS, fly-by-wire), blade tracking and 1/rev and n/rev vibration analysis, transmissions (main gearbox, freewheel units, rotor brake, tail rotor drive), airframe structures, and systems including air conditioning, electrical, fire protection, fuel, hydraulics, ice and rain protection, landing gear, lights and instruments. Candidates get a maximum of 3 consecutive attempts with a 90-day wait. The module follows Commission Implementing Regulation (EU) 2023/989, applicable 12 June 2024.
Sample Module 12 Practice Questions
Try these sample questions to test your Module 12 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1In forward flight, the advancing blade of a single main rotor travels faster through the air than the retreating blade, producing unequal lift across the rotor disc. What is this phenomenon called?
2A helicopter is established in a high descent rate at low forward airspeed with power applied, and the pilot reports rising sink rate, increasing vibration and reduced cyclic authority. The rotor is descending into its own downwash. Which condition is this?
3When a cyclic input is applied to a rotating rotor disc, the maximum displacement of the disc occurs approximately 90 degrees later in the direction of rotation than the point of input. This characteristic is a result of:
4As an articulated rotor blade flaps upward, its centre of mass moves closer to the axis of rotation. To conserve angular momentum the blade tends to accelerate. What is this effect, which is accommodated by the lead-lag (drag) hinge?
5Retreating blade stall is the primary aerodynamic limitation that establishes which helicopter performance boundary?
6During autorotation following a power loss, what provides the energy to keep the main rotor turning?
7A single main rotor helicopter tends to drift laterally in a stable hover because of the thrust produced by the tail rotor. What is this tendency, and how is it commonly corrected by the designer?
8A helicopter hovering close to the ground requires less power than the same hover at altitude. The cushion of higher-pressure air beneath the disc that reduces induced drag and downwash is known as:
9As a helicopter accelerates from the hover through about 16 to 24 knots, rotor efficiency suddenly improves and the aircraft tends to climb without an increase in power. This effect is called:
10On the retreating side of the rotor disc in high-speed forward flight, a region near the blade root experiences airflow that strikes the trailing edge first. What is this region called?
About the Module 12 Exam
EASA Part-66 Module 12 covers helicopter aerodynamics, structures and systems and is one of the knowledge modules required for the B1.3 (turbine helicopter) and B1.4 (piston helicopter) aircraft maintenance licence categories, with reduced syllabus depth for the A3/A4 categories. It examines rotary-wing theory of flight, flight control systems, blade tracking and vibration analysis, transmissions, airframe structures and the full range of helicopter systems. The real examination is multiple-choice (3-option), sat at a National Aviation Authority or an approved Part-147 organisation, with a 75% pass mark. The module reflects Commission Implementing Regulation (EU) 2023/989, applicable from 12 June 2024.
Questions
128 scored questions
Time Limit
160 minutes (B1.3/B1.4); 125 minutes for A3/A4 (100 questions)
Passing Score
75% per module
Exam Fee
Varies by NAA/Part-147 organisation (approx. EUR 50-230 per module sitting) (EASA framework - examinations conducted by National Aviation Authorities or approved Part-147 maintenance training organisations)
Module 12 Exam Content Outline
Theory of Flight - Rotary Wing Aerodynamics
Torque reaction and directional control, gyroscopic precession and 90-degree phase lag, dissymmetry of lift and blade flapping, retreating blade stall setting VNE, translating tendency, Coriolis effect and lead-lag, vortex ring state and overpitching, autorotation regions, ground effect and effective translational lift
Flight Control Systems
Cyclic and collective control via the swashplate and pitch links, anti-torque (yaw) control with conventional tail rotor, Fenestron and NOTAR, main rotor head types (articulated, semi-rigid teetering, hingeless), blade dampers, fixed/adjustable stabilisers, artificial feel, AFCS/SAS, fly-by-wire signalling and control rigging
Blade Tracking & Vibration Analysis
Tracking the tip-path plane, span and chord balance, pitch-link and trim-tab adjustment for high/low blades, 1/rev lateral main rotor vibration versus high-frequency tail rotor vibration, n/rev blade-passing frequencies, magnetic-pickup azimuth reference and bifilar/anti-resonance vibration absorbers
Transmissions
Main gearbox spiral-bevel and planetary reduction stages, sprag-type freewheel units enabling autorotation, twin-engine combining gearboxes, rotor brake limits, tail rotor drive shafts with hanger bearings and flexible couplings, intermediate and tail gearboxes, chip detectors and gearbox oil temperature/pressure monitoring
Airframe Structures
Semi-monocoque fuselage and tail boom, firewalls of stainless steel/titanium and fire zones, composite rotor blades and honeycomb-sandwich panels, life-limited (safe-life) dynamic components, highly stressed blade attachment fittings, NDT methods (penetrant, magnetic particle, eddy current, tap testing) and equipment and furnishings for occupant restraint
Aircraft Systems
Air-cycle and vapour-cycle air conditioning, DC/AC electrical power with inverters and TRUs, continuous-loop fire detection and halon-type extinguishing with discharge indicators, boost/transfer/cross-feed fuel and crash-resistant fuel systems, single and dual hydraulic systems with accumulators, thermal and electrical ice protection, skid/wheel/float landing gear, navigation and anti-collision lights and pneumatic/vacuum services
Instruments & Avionics
Pitot-static instruments (airspeed, altimeter, VSI), gyroscopic attitude indicator using rigidity in space, torquemeter and low rotor RPM warning, radio altimeter for low-level operations, Integrated Modular Avionics (IMA), and HUMS and on-board maintenance fault-recording systems
How to Pass the Module 12 Exam
What You Need to Know
- Passing score: 75% per module
- Exam length: 128 questions
- Time limit: 160 minutes (B1.3/B1.4); 125 minutes for A3/A4 (100 questions)
- Exam fee: Varies by NAA/Part-147 organisation (approx. EUR 50-230 per module sitting)
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
Module 12 Study Tips from Top Performers
Frequently Asked Questions
What is EASA Part-66 Module 12?
Module 12 is the helicopter aerodynamics, structures and systems knowledge module of the EASA Part-66 aircraft maintenance licence syllabus. It is required for the B1.3 (turbine helicopter) and B1.4 (piston helicopter) categories, with a reduced syllabus depth for the A3/A4 categories.
How many questions are on the Module 12 exam and how long is it?
For B1.3/B1.4 the exam is 128 multiple-choice questions in 160 minutes; for A3/A4 it is 100 questions in 125 minutes. The pace works out at about 75 seconds per question, and the pass mark is 75%.
Is the real Module 12 exam multiple-choice or essay?
Module 12 is multiple-choice only, with three options per question in the real exam. Essays were removed from Modules 9 and 10 in June 2024 and now remain only in Module 7. This free practice bank uses four options to give extra distractor practice.
What topics does Module 12 cover?
It covers rotary-wing theory of flight (dissymmetry of lift, retreating blade stall, vortex ring state, autorotation), flight control systems, blade tracking and vibration analysis, transmissions, airframe structures, and helicopter systems such as fuel, hydraulics, electrical, fire protection, ice and rain protection and landing gear.
What does Commission Implementing Regulation (EU) 2023/989 change?
Applicable from 12 June 2024, it merged former sub-module splits (for example 7A/7B into 7, 9A/9B into 9 and 11A/11B/11C into 11) and removed essays from Modules 9 and 10. Courses started under the old standard must be completed by 12 June 2026.
How many attempts do I get to pass Module 12?
Candidates may take a maximum of 3 consecutive attempts at a module. After a third unsuccessful attempt a 90-day waiting period applies before the next attempt, in line with EASA Part-66 examination rules.
Does Module 12 apply to UK CAA licences?
This practice bank is EASA-specific. Since Brexit the UK CAA Part-66 syllabus has diverged from EASA, so UK candidates should confirm their syllabus version with the CAA, though the underlying helicopter engineering principles are broadly the same.