GCAA CAR-66 Category A Exam study guide
GCAA CAR-66 Category A Exam · Work through your exam, one topic at a time.
The GCAA CAR-66 Category A licence is the entry-level aircraft maintenance certification issued under the United Arab Emirates General Civil Aviation Authority's CAR-66 framework. It authorises the holder to carry out and certify specified maintenance tasks on aircraft, working under the scope defined for the category, and it is the usual starting point for people building a career in UAE aircraft maintenance before progressing toward Category B certifications. The GCAA CAR-66 Category A Exam study guide has 11 sections and about 3,600 words.
01Mathematics
Candidates need arithmetic without a calculator, fractions and decimals, ratio and proportion, percentages, powers and roots, simple and compound interest, and basic algebra (transposing formulae, solving linear equations). Geometry essentials include area and volume of common shapes (rectangle, triangle, circle, cylinder, sphere, cone), the Pythagorean theorem, and unit conversion (inches to mm, litres to gallons, kg to lb).
323 words, about 2 min02Physics
Physics for aircraft maintenance covers matter and its states, mass versus weight, density and specific gravity, force, moments and couples, pressure (including gauge versus absolute), work, power and energy, heat and temperature scales, and basic mechanics of solids, liquids and gases. You should understand the gas laws qualitatively, thermal expansion, and the difference between static and dynamic pressure as used in pitot-static systems.
320 words, about 2 min03Electrical Fundamentals
Candidates must master electron flow versus conventional current, voltage, current and resistance, Ohm's law (V = IR), power (P = VI = I²R = V²/R), series and parallel circuits, Kirchhoff's laws, and the magnetic effects of current. You also need capacitance (series and parallel rules are the reverse of resistors), inductance, AC fundamentals (frequency, period, RMS versus peak, phase), and the basics of transformers and batteries.
330 words, about 2 min04Electronic Fundamentals
This domain covers semiconductor devices and their aircraft applications: diodes (rectifier, zener, light-emitting), transistors as switches and amplifiers, thyristors, and integrated circuits. You need the PN junction behaviour (forward bias conduction, reverse bias blocking), half-wave and full-wave rectification, ripple and smoothing, and the function of filters and voltage regulators.
313 words, about 2 min05Digital Techniques / Electronic Instrument Systems
Candidates should understand number systems (binary, octal, hexadecimal), logic gates and truth tables, combinational versus sequential logic, flip-flops and counters, and the architecture of digital systems: buses, memory, processors, and data conversion (ADC/DAC). Aircraft-specific content includes digital data buses (ARINC 429, ARINC 629, MIL-STD-1553), electronic displays (EFIS, EICAS/ECAM), and integrated modular avionics concepts at a descriptive level.
274 words, about 1 min06Materials and Hardware
This domain covers aircraft materials (aluminium alloys, titanium, steel, composites), their properties and heat treatment, corrosion types and prevention, fasteners (rivets, bolts, screws, nuts, locking devices), bearings, springs, pipes and unions, and control cables. You must recognise standard hardware markings, thread types, grip length selection for bolts, and the difference between close-tolerance and interference-fit fasteners.
294 words, about 1 min07Maintenance Practices
Candidates must understand safety practices, aircraft handling and storage, ramp and hangar procedures, torque and tensioning, inspection techniques (visual, NDT methods such as dye penetrant, magnetic particle, eddy current, ultrasonic, radiography), and documentation. You should know the purpose and content of maintenance manuals, service bulletins, airworthiness directives, and the meaning of scheduled versus unscheduled maintenance.
282 words, about 1 min08Basic Aerodynamics
Basic aerodynamics covers the atmosphere and its properties, airflow and Bernoulli's principle, the generation of lift and drag, angle of attack, stall, and the four forces in flight (lift, weight, thrust, drag). You should understand airspeed terms (indicated, calibrated, true, ground speed), the relationship between altitude and air density, and the effects of temperature and pressure on aircraft performance.
322 words, about 2 min09Human Factors
Human factors covers the SHELL model, error models (e.g. the Swiss cheese model), fatigue, stress, workload, situational awareness, communication, teamwork, and the physiological factors affecting maintenance personnel.
280 words, about 1 min10Aviation Legislation
This domain covers the regulatory framework: ICAO Annexes, national authorities (e.g. GCAA in the UAE), CAR-66 and CAR-145, continuing airworthiness (CAR-M), and the roles of the certifying staff, approved maintenance organisation, and the authority.
297 words, about 1 min11Aircraft Aerodynamics, Structures and Systems
This domain covers aircraft structures (fuselage, wings, empennage, landing gear), structural design concepts (stress, strain, tension, compression, shear, bending, torsion), and aircraft systems: hydraulic, pneumatic, fuel, electrical, flight controls, air conditioning and pressurisation, ice and rain protection, and landing gear. You should understand system architecture at a descriptive level: reservoirs, pumps, accumulators, valves, and the purpose of each.
565 words, about 3 min