100+ Free CAAB AME B1.3 Exam Practice Questions

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Sample CAAB AME B1.3 Exam Practice Questions

Try these sample questions to test your CAAB AME B1.3 Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary aerodynamic purpose of main rotor blade twist (washout) on a helicopter?

A.To decrease rotor tip vortex size and minimize noise signature

B.To produce a more uniform distribution of lift along the span of the blade

C.To increase the structural rigidity of the blade at high rotational speeds

D.To prevent aerodynamic stall on the retreating blade in high-speed forward flight

Explanation: Blade twist (washout) involves designing the rotor blade with a higher angle of incidence at the root than at the tip. Because rotational velocity increases from the root to the tip, twisting the blade helps distribute lift more evenly along the blade span, reducing peak lift and bending stresses at the blade tips.

2In forward flight, the aerodynamic phenomenon known as 'dissymmetry of lift' is primarily compensated for by which blade action?

A.Flapping up on the retreating blade and down on the advancing blade

B.Flapping up on the advancing blade and down on the retreating blade

C.Feathering the advancing blade to increase its angle of attack

D.Leading and lagging of both blades simultaneously

Explanation: Dissymmetry of lift is caused by the relative wind speed difference between the advancing and retreating sides of the rotor disc. It is compensated for by blade flapping: the advancing blade experiences higher relative wind and flaps up, reducing its angle of attack and lift, while the retreating blade experiences lower relative wind and flaps down, increasing its angle of attack and lift.

3Which of the following conditions is most likely to initiate 'retreating blade stall' on a helicopter main rotor?

A.Low gross weight, low density altitude, and high rotor RPM

B.High gross weight, high density altitude, and high forward speed

C.Low gross weight, low density altitude, and low forward speed

D.High gross weight, low density altitude, and low rotor RPM

Explanation: Retreating blade stall occurs when the retreating blade operates at a high angle of attack to produce lift comparable to the advancing blade. High gross weight (demands more lift), high density altitude (thin air requires larger angles of attack), and high forward speed (increases dissymmetry of lift) combine to push the retreating blade beyond its critical angle of attack.

4During autorotation, which region of the rotor blade provides the thrust force required to keep the rotor spinning?

A.The inner 25% of the blade (stall region)

B.The middle 25% to 70% of the blade (driving/autorotative region)

C.The outer 30% of the blade (driven/propeller region)

D.The rotor tip cap assembly only

Explanation: In autorotative flight, the rotor blade is divided into three regions: the stall region (inner 25%), the driving/autorotative region (middle 25-70%), and the driven/propeller region (outer 70-100%). The driving region experiences a relative wind that produces a lift vector tilted forward of the axis of rotation, providing a forward-acting aerodynamic force (rotational force) that drives the rotor.

5Which combination of parameters is required for a helicopter to enter a Vortex Ring State (settling with power)?

A.High forward speed, low rate of descent, and engine at idle power

B.Zero or low forward speed, rate of descent exceeding 300-500 fpm, and engine power applied

C.High forward speed, high rate of descent, and engine at maximum power

D.Zero forward speed, vertical climb, and engine at idle power

Explanation: Vortex Ring State (settling with power) occurs when a helicopter settles into its own downwash. The conditions required are: low or zero forward speed (which prevents the wash from being blown behind), a high rate of descent (exceeding ~300-500 fpm depending on the type), and engine power applied (which creates the strong tip vortices that recirculate air).

6What is the primary physical cause of 'effective translational lift' (ETL) as a helicopter transitions to forward flight?

A.An increase in induced flow due to horizontal velocity

B.The rotor disc encountering cleaner, less turbulent air, which reduces induced flow and tilts the lift vector forward

C.The automatic disengagement of the tail rotor system at high speeds

D.The cooling effect of forward airspeed on the main gearbox housing

Explanation: Effective translational lift (ETL) occurs typically between 16 and 24 knots. As forward speed increases, the rotor system leaves its own recirculated air and moves into clean, undisturbed air. This significantly reduces induced flow and rotor tip vortices, causing the lift vector to become more vertical and efficient.

7According to the Coriolis effect, when a main rotor blade flaps upward in a fully articulated rotor head, what happens to its angular speed?

A.It remains exactly constant due to the friction dampers

B.It increases because the blade's center of gravity moves closer to the axis of rotation

C.It decreases because the blade's center of gravity moves further from the axis of rotation

D.It drops instantly to zero until cyclic control is neutralized

Explanation: According to the conservation of angular momentum (Coriolis effect), as a rotor blade flaps up, its center of gravity moves closer to the rotational axis. To conserve angular momentum, the blade's rotational velocity must increase, causing it to hunt forward (lead) in the plane of rotation. This motion is accommodated by the lead-lag hinge.

8Due to gyroscopic precession, how many degrees of phase lag exist between the point of cyclic control input and the resulting blade response?

A.45 degrees in the direction of rotation

B.90 degrees in the direction of rotation

C.180 degrees opposite the direction of rotation

D.270 degrees in the direction of rotation

Explanation: Gyroscopic precession dictates that a force applied to a rotating body manifests its maximum effect 90 degrees later in the direction of rotation. In a helicopter rotor system, to tilt the rotor disc forward, the maximum blade pitch change (force input) must occur 90 degrees prior (on the side of the disc).

9Ground resonance is a destructive vibration phenomenon most associated with which type of rotor hub and landing gear configuration?

A.Rigid rotor heads with skid landing gear

B.Fully articulated rotor systems with wheel-type landing gear containing faulty shock dampers

C.Semi-rigid rotor systems with high skid landing gear

D.Teetering rotor heads with pneumatic float systems

Explanation: Ground resonance occurs when a fully articulated rotor system (which has lead-lag hinges allowing blades to move out of phase) becomes unbalanced. If the helicopter experiences a hard landing or has faulty landing gear dampers (struts), the rotor blades can cluster on one side, shifting the CG and causing severe, self-amplifying oscillations that can destroy the airframe.

10A helicopter main rotor has a radius of 6.0 meters and rotates at a constant speed of 310 RPM. What is the approximate linear velocity of the rotor blade tip?

A.124.6 m/s

B.194.8 m/s

C.310.0 m/s

D.389.6 m/s

Explanation: The linear tip speed is calculated using the formula: V = ω * R, where ω is the angular velocity in radians per second and R is the radius. 1. Convert RPM to rad/s: ω = (2 * π * N) / 60 = (2 * 3.14159 * 310) / 60 ≈ 32.463 rad/s. 2. Calculate velocity: V = 32.463 rad/s * 6.0 m ≈ 194.78 m/s.

About the CAAB AME B1.3 Exam Exam

The CAAB Aircraft Maintenance Engineer (AME) Category B1.3 licence authorizes holders to certify maintenance on turbine-powered helicopters, including airframe structures, mechanical and electrical systems, and powerplants, plus simple avionic tests. The examination process follows the modular ANO Part-66 syllabus. Candidates must pass all required module exams within 5 years of passing the first module, followed by practical experience requirements before license issuance.

Assessment

The basic-knowledge license requirements are assessed through separate modular exams. Candidates must pass multiple-choice module papers covering Helicopter Aerodynamics, Structures and Systems (M12), Gas Turbine Engine (M15), Human Factors (M9), and Aviation Legislation (M10).

Time Limit

Module exams are timed individually at approximately 75 seconds per question. Module 12 is 160 minutes, Module 15 is 115 minutes, Module 9 is 35 minutes, and Module 10 is 55 minutes.

Passing Score

75 percent for each multiple-choice module. Candidates who fail must wait 90 days before a retake, or 30 days if completing approved training.

Exam Fee

Typically 2,000 to 3,000 BDT per basic module exam, paid to the Civil Aviation Authority of Bangladesh (CAAB) via treasury challan. Check the official CAAB exam portal for updates. (Civil Aviation Authority of Bangladesh (CAAB))

CAAB AME B1.3 Exam Exam Content Outline

40%

Helicopter Aerodynamics, Structures and Systems (Module 12)

Rotary wing aerodynamics, cyclic/collective controls, rotor head and blade designs, vibration and tracking, tail rotors, transmissions, hydraulics, fuel, and fire protection systems.

30%

Gas Turbine Engine (Module 15)

Turboshaft engine principles, inlet, compressors, combustion, turbine sections, exhaust, lubrication, fuel controls, FADEC, starting, and monitoring.

15%

Human Factors (Module 9)

Human performance and limitations, social psychology, environmental factors, physical work, communication, error models (SHEL), and maintenance error management.

15%

Aviation Legislation (Module 10)

Bangladesh Civil Aviation Rules 1984, ANO Part-66, ANO Part-145, ANO Part-M, licensing privileges, Certificate of Release to Service (CRS), and airworthiness directives.

How to Pass the CAAB AME B1.3 Exam Exam

What You Need to Know

Passing score: 75 percent for each multiple-choice module. Candidates who fail must wait 90 days before a retake, or 30 days if completing approved training.
Assessment: The basic-knowledge license requirements are assessed through separate modular exams. Candidates must pass multiple-choice module papers covering Helicopter Aerodynamics, Structures and Systems (M12), Gas Turbine Engine (M15), Human Factors (M9), and Aviation Legislation (M10).
Time limit: Module exams are timed individually at approximately 75 seconds per question. Module 12 is 160 minutes, Module 15 is 115 minutes, Module 9 is 35 minutes, and Module 10 is 55 minutes.
Exam fee: Typically 2,000 to 3,000 BDT per basic module exam, paid to the Civil Aviation Authority of Bangladesh (CAAB) via treasury challan. Check the official CAAB exam portal for updates.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CAAB AME B1.3 Exam Study Tips from Top Performers

1Focus heavily on Module 12 (Helicopter Aerodynamics, Structures and Systems) since it represents 40% of the questions and covers unique rotary-wing dynamics, rotor-head mechanics, and transmission systems.

2Understand turboshaft-specific gas turbine engine operations (Module 15), including torque meters, free-turbine arrangements, and engine controls, as these differ from conventional turbofans.

3Don't neglect Module 10 (Aviation Legislation): ensure you are familiar with Bangladesh-specific CAR '84 regulations, CAAB's Air Navigation Orders (ANO Part-66, Part-145, Part-M), and CRS requirements.

Frequently Asked Questions

What does a CAAB AME Category B1.3 licence cover?

The Category B1.3 licence allows you to issue Certificates of Release to Service (CRS) for turbine-powered helicopters after maintenance on airframe structures, powerplants, and mechanical or electrical systems. It also allows simple tests on avionic systems to verify serviceability.

How are the CAAB AME module exams graded?

All multiple-choice module exams are graded based on a minimum passing score of 75 percent. There is no negative marking for incorrect answers. The exams are conducted electronically or in written format by CAAB or an approved Part-147 organisation.

What happens if I fail a CAAB module exam?

If you fail a module exam, you must wait at least 90 days before you can apply to retake it. This waiting period can be reduced to 30 days if you complete a course of retraining at an approved Part-147 maintenance training organisation like BATC.

What is the timeline to pass all modular exams?

Under ANO Part-66, you must successfully pass all required basic modules within a 5-year window. The 5-year clock starts from the date of the first passed module. If you exceed this window, the earliest passed modules will expire and must be retaken.