Question 1
What aerodynamic phenomenon causes a helicopter to tilt to the left or right during forward flight unless compensated for by cyclic pitch control?
Correct Answer:
Dissymmetry of lift
Question 2
Due to gyroscopic precession, if a force is applied perpendicular to the plane of rotation of a main rotor blade, where does the maximum aerodynamic response (displacement) occur?
Correct Answer:
90 degrees later in the direction of rotation
Question 3
In a fully articulated main rotor head, what mechanical component allows the individual rotor blades to move forward and backward in the plane of rotation to absorb acceleration and deceleration forces?
Correct Answer:
Lead-lag (drag) hinge
Question 4
What is the primary function of the freewheeling unit (sprag clutch) located between the helicopter engine and the main gearbox?
Correct Answer:
To automatically disengage the engine from the transmission in the event of engine failure, permitting autorotation
Question 5
During autorotation following a engine failure, which region of the main rotor blade along its span acts as the driving region (generating forward aerodynamic force to keep the rotor turning)?
Correct Answer:
The mid-blade region (approximately 25% to 70% span)
Question 1
Exam overview

About this Exam

The CAAS SAR 66 Aircraft Maintenance License (AML) is the essential certification for aviation professionals aspiring to become Licensed Aircraft Engineers (LAEs) in Singapore. Administered by the Civil Aviation Authority of Singapore (CAAS), this license validates that technicians possess the mandatory knowledge and skills required to perform and certify maintenance on Singapore-registered aircraft.

The SAR 66 framework structure ensures safety and reliability within the aerospace sector by setting high standards for certifying staff. This exam preparation material is specifically designed for dedicated individuals aiming to pass the rigorous subject modules required for Category A, B1 (Mechanical), or B2 (Avionics) licenses.

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Additional Information

What the Course Entails and Exam Details

To obtain a CAAS SAR 66 AML, candidates must demonstrate proficiency across several core modules. These modules cover a wide spectrum of aviation knowledge, including technical subjects and regulatory requirements.

Typically, the course syllabus includes foundation subjects such as Mathematics and Physics, progressing to fundamental technical knowledge like Electrical Fundamentals, Electronic Fundamentals, and Digital Techniques. Advanced modules focus on critical areas such as Materials and Hardware, Maintenance Practices, and basic Aerodynamics. Candidates also study specific topics relevant to their chosen license category, such as Turbine Aeroplane Aerodynamics, Structures and Systems (for B1), or Propulsion, and Avionic Systems (for B2).

Furthermore, all applicants must pass modules on Human Factors and Aviation Legislation to understand the regulatory environment and maintenance philosophy in Singapore.


What to Expect in the Final Exam

The CAAS SAR 66 AML examinations are demanding and require thorough preparation. The assessment primarily consists of closed-book, multiple-choice question (MCQ) papers for each module.

Depending on the specific module, some exams may also incorporate essay questions to test the candidate’s ability to explain complex concepts clearly.

The passing mark for each module is 75%, reflecting the high standard required for certifying staff. The time limits for the exams vary significantly, ranging from 25 minutes for shorter modules to over two hours for more complex technical subjects.

Candidates must sit these exams at CAAS-approved examination centers or through authorized Part 147 Maintenance Training Organizations (MTOs) in Singapore.


How to Study and Exam Centers

Effective preparation for the CAAS SAR 66 exams combines diligent study of the official syllabus with strategic practice. Focus your initial efforts on mastering the core concepts outlined in the CAAS Part 66 Standards, utilizing training manuals and notes provided by approved Part 147 Maintenance Training Organizations.

Incorporating practice exams into your study routine is crucial. Consistently taking mock tests helps you familiarize yourself with the MCQ format, improve your time management, and identify specific knowledge gaps that need addressing.

When you are ready to attempt the examinations, you can register through an approved Part 147 MTO in Singapore that has been granted examination privileges by CAAS. These organizations conduct the examinations on behalf of the authority.

Some of the notable centers in Singapore include the Singapore Institute of Aerospace Engineers (SIAE) and major Maintenance, Repair, and Overhaul (MRO) companies with integrated training arms, such as ST Engineering Aerospace.


Job Opportunities from the Course

Earning the CAAS SAR 66 Aircraft Maintenance License unlocks a wide range of career opportunities within Singapore’s vibrant aerospace industry.

This certification is the key prerequisite for advancing into the role of a Licensed Aircraft Engineer (LAE), a highly respected and essential position in aviation maintenance.

The SAR 66 AML enables you to pursue the following career paths:

  • Licensed Aircraft Engineer (LAE) (Category A, B1, or B2)

  • Aircraft Maintenance Technician / Mechanic (progressing towards licensure)

  • Workshop Engineer / Certifying Staff (component maintenance)

  • Technical Instructor (within Part 147 organizations)

  • Quality Assurance Inspector / Auditor in aerospace organizations

Securing your CAAS SAR 66 license positions you strongly for employment with major airlines, leading MRO providers, and aerospace manufacturing companies operating in Singapore, including Singapore Airlines Engineering Company (SIAEC) and ST Engineering.


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