100+ Free GCAA CAR-66 Category A Exam Practice Questions

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Sample GCAA CAR-66 Category A Exam Practice Questions

Try these sample questions to test your GCAA CAR-66 Category A Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under GCAA CAR-66, a Category A aircraft maintenance licence permits the holder to issue a Certificate of Release to Service (CRS) following which scope of work?

A.Major structural repairs and engine changes during base maintenance

B.Minor scheduled line maintenance and simple defect rectification within the limits of tasks endorsed on the authorisation

C.Avionics troubleshooting on complex integrated digital systems

D.Complete aircraft type certification activities

Explanation: A Category A licence is for the line maintenance certifying mechanic. It permits the holder to certify minor scheduled line maintenance and simple defect rectification, but only for tasks specifically endorsed on the certification authorisation issued by the CAR-145 organisation. Privileges are restricted to work the holder personally performed.

2Which body issues and regulates the CAR-66 Aircraft Maintenance Engineer Licence in the United Arab Emirates?

A.The European Union Aviation Safety Agency (EASA)

B.The Federal Aviation Administration (FAA)

C.The General Civil Aviation Authority (GCAA)

D.The International Civil Aviation Organization (ICAO)

Explanation: The General Civil Aviation Authority (GCAA) is the UAE's national aviation regulator and issues the CAR-66 licence. UAE CAR-66 is closely harmonised with EASA Part-66 but is a national regulation administered by the GCAA.

3In the binary numbering system, what is the decimal value of the binary number 1011?

A.9

B.11

C.13

D.15

Explanation: Binary 1011 is evaluated as (1x8) + (0x4) + (1x2) + (1x1) = 8 + 0 + 2 + 1 = 11. Each position represents a power of two increasing from right to left.

4A technician needs to convert 3/8 inch to its decimal equivalent for a measurement. What is the correct value?

A.0.250

B.0.375

C.0.500

D.0.625

Explanation: Dividing 3 by 8 gives 0.375. Converting common fractions to decimals is a routine task when reading drawings, torque values and tolerances in maintenance work.

5What is the area of a circle that has a radius of 4 cm? (Use the formula Area = pi x r squared.)

A.12.57 cm squared

B.25.13 cm squared

C.50.27 cm squared

D.16.00 cm squared

Explanation: Area = pi x r squared = 3.1416 x 4 x 4 = 3.1416 x 16 = 50.27 cm squared. Squaring the radius before multiplying by pi is essential to get the correct result.

6Ohm's law relates voltage, current and resistance. If a circuit has 24 volts applied across a 6-ohm resistor, what current flows?

A.0.25 amperes

B.4 amperes

C.30 amperes

D.144 amperes

Explanation: Ohm's law states I = V / R. Therefore I = 24 / 6 = 4 amperes. This fundamental relationship underpins all electrical fault-finding in aircraft systems.

7Three resistors of 10 ohms each are connected in series. What is the total resistance of the circuit?

A.3.3 ohms

B.10 ohms

C.30 ohms

D.100 ohms

Explanation: In a series circuit, total resistance is the sum of the individual resistances: 10 + 10 + 10 = 30 ohms. Series resistances always add directly.

8In a parallel DC circuit, how does the voltage across each branch compare?

A.The voltage divides equally between the branches

B.The voltage across each parallel branch is the same

C.The voltage is highest across the branch with the most resistance only if current is constant

D.The voltage depends on the number of branches and decreases with each added branch

Explanation: In a parallel circuit all branches are connected across the same two nodes, so each branch sees the same voltage. The current, however, divides between the branches according to their resistance.

9What is the primary function of a diode in an electronic circuit?

A.To store electrical charge

B.To allow current to flow in one direction only

C.To amplify weak signals

D.To convert AC frequency to a higher value

Explanation: A diode is a semiconductor device that conducts current in one direction (forward biased) and blocks it in the reverse direction. This property makes diodes essential for rectification and circuit protection in aircraft electronics.

10A logic gate produces a HIGH (1) output only when ALL of its inputs are HIGH (1). Which gate is this?

A.OR gate

B.AND gate

C.NOT gate

D.XOR gate

Explanation: An AND gate outputs logic 1 only when every input is logic 1; any low input produces a low output. AND logic is fundamental to digital systems used in modern aircraft.

About the GCAA CAR-66 Category A Exam Exam

The UAE GCAA CAR-66 Category A licence is for the line maintenance certifying mechanic, authorised to issue a Certificate of Release to Service following minor scheduled line maintenance and simple defect rectification within endorsed task limits. Candidates pass modular basic-knowledge examinations (M1-M10 at the Category A level) at a GCAA-approved CAR-147 organisation, with strong emphasis on maintenance practices, human factors and aviation legislation.

Assessment

Modular basic-knowledge examinations taken per module at a GCAA-approved CAR-147 organisation. Category A papers are multiple-choice at the knowledge level appropriate to a line maintenance certifying mechanic; each module is examined and passed separately.

Time Limit

Set per module; multiple-choice questions are allotted a fixed time each (commonly around 75 seconds per question), so total time depends on the module's question count.

Passing Score

A minimum of 75% correct answers is required to pass each basic-knowledge multiple-choice module, in line with EASA Part-66 harmonisation.

Exam Fee

Module examination fees are set by the approved CAR-147 examination organisation and vary by provider and number of modules; confirm current fees with your organisation. (General Civil Aviation Authority (GCAA), UAE, through approved CAR-147 organisations)

GCAA CAR-66 Category A Exam Exam Content Outline

26%

Maintenance Practices (M7)

Safe working, tooling and torque, locking devices and fasteners, NDT awareness, wiring and control rigging, plus line-maintenance documentation discipline.

13%

Human Factors (M9)

Human performance and limitations, the Dirty Dozen, communication, fatigue, complacency, error management and just safety culture.

14%

Aviation Legislation (M10)

UAE CAR-66 licensing, Category A privileges and authorisation, CAR-145 organisations, CRS, ADs, the MEL and continuing-airworthiness records.

12%

Materials and Hardware (M6)

Aircraft metals and tempers, composites, corrosion, fasteners, rivets, locking devices and heat-treatment fundamentals.

10%

Electrical Fundamentals (M3)

Ohm's law, series and parallel circuits, AC and DC, circuit protection, generators, transformers and battery capacity.

Mathematics (M1)

Arithmetic, fractions and decimals, percentages, basic geometry and trigonometry for maintenance calculations.

Physics (M2)

Mechanics, work and energy, moments, pressure and force, temperature and Pascal's principle for hydraulics.

Basic Aerodynamics (M8)

Lift and the four forces, flight controls, angle of attack, stability and the stall.

Electronic and Digital Fundamentals (M4/M5)

Semiconductors, diodes, transistors and capacitors, logic gates and binary/hexadecimal number systems.

How to Pass the GCAA CAR-66 Category A Exam Exam

What You Need to Know

Passing score: A minimum of 75% correct answers is required to pass each basic-knowledge multiple-choice module, in line with EASA Part-66 harmonisation.
Assessment: Modular basic-knowledge examinations taken per module at a GCAA-approved CAR-147 organisation. Category A papers are multiple-choice at the knowledge level appropriate to a line maintenance certifying mechanic; each module is examined and passed separately.
Time limit: Set per module; multiple-choice questions are allotted a fixed time each (commonly around 75 seconds per question), so total time depends on the module's question count.
Exam fee: Module examination fees are set by the approved CAR-147 examination organisation and vary by provider and number of modules; confirm current fees with your organisation.

Keys to Passing

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

GCAA CAR-66 Category A Exam Study Tips from Top Performers

1Concentrate your revision on Maintenance Practices (M7), Human Factors (M9) and Aviation Legislation (M10), as these dominate the Category A line-maintenance role and appear heavily in practice papers.

2Memorise the Dirty Dozen and the SHEL(L) model, and be able to link each human-factor to a real maintenance-error scenario, because Module 9 questions are frequently scenario-based.

3Practise the legislation essentials, including Category A privileges, certification authorisation, the CRS, Airworthiness Directives and the MEL, and confirm current rules against the official GCAA CAR-66 publication.

Frequently Asked Questions

What does a GCAA CAR-66 Category A licence allow you to do?

A Category A licence qualifies a line maintenance certifying mechanic to issue a Certificate of Release to Service following minor scheduled line maintenance and simple defect rectification, but only for tasks specifically endorsed on the certification authorisation and only for work the holder personally performed within a CAR-145 organisation.

How is the CAR-66 Category A exam structured?

Knowledge is assessed through modular basic-knowledge examinations (Modules M1 to M10) at the Category A level, taken at a GCAA-approved CAR-147 organisation. Each module is examined and passed separately using multiple-choice questions appropriate to the Category A knowledge level.

What is the pass mark for CAR-66 basic-knowledge modules?

Each basic-knowledge multiple-choice module must be passed with at least 75% correct answers, harmonised with EASA Part-66. Always confirm the exact requirements with your GCAA-approved CAR-147 examination organisation.

Which modules matter most for Category A?

Category A focuses heavily on Maintenance Practices (M7), Human Factors (M9) and Aviation Legislation (M10), supported by Materials and Hardware (M6) and the mathematics, physics, electrical, electronic, digital and basic aerodynamics fundamentals at the Category A knowledge level.