GCAA CAR-66 B2 Exam flashcards
GCAA CAR-66 B2 Exam · Build recall with a focused review session.
33 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Ohm's law
- The current through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance, expressed as V = IR.
- Critical angle of attack
- The angle of attack at which the wing produces maximum lift and beyond which the airflow separates, causing a stall regardless of airspeed or weight.
- Bypass ratio
- The ratio of the mass of air flowing through the bypass duct to the mass flowing through the engine core, a key efficiency parameter for turbofan engines.
- Autorotation
- A helicopter rotor condition in which the rotor is driven by upward air flowing through it after engine power loss, allowing a controlled descent and landing.
- SHELL model
- A human factors framework placing Liveware (the person) at the centre, interacting with Software, Hardware, Environment and other Liveware to identify error sources.
- Two's complement
- A binary representation for signed numbers where the negative of a value is formed by inverting all bits and adding one to the least significant bit.
- ARINC 429 bus
- A one-way serial data bus used in civil aircraft avionics, transmitting 32-bit words from a single transmitter to one or more receivers.
- Sine rule
- In any triangle, the ratio of a side length to the sine of its opposite angle is constant: a/sin A = b/sin B = c/sin C.
- Inductive reactance
- The opposition to alternating current caused by an inductor, calculated as X_L = 2πfL, where f is frequency in hertz and L is inductance in henries.
- Zener diode
- A diode designed to operate in reverse breakdown at a specified voltage, providing a stable reference voltage for regulation and protection circuits.
- Operational amplifier
- A high-gain differential amplifier whose ideal characteristics include infinite open-loop gain, infinite input impedance and zero output impedance.
- Nyquist criterion
- To reconstruct a sampled signal accurately, the sampling frequency must be greater than twice the highest frequency present in the original signal.
- Solution heat treatment
- Heating an aluminium alloy to dissolve alloying elements, then rapid quenching to retain them in solution before precipitation hardening.
- Galvanic corrosion
- Corrosion caused when two dissimilar metals are in electrical contact in the presence of an electrolyte, with the more anodic metal corroding preferentially.
- Safety wire installation
- Lockwire must be installed so that tension pulls each fastener in the tightening direction, with specified twist direction and pigtail length.
- Torque wrench use
- A calibrated tool applies a specified torque equal to force multiplied by lever arm, ensuring fasteners are tightened to the value stated in the manual.
- Induced drag
- Drag produced as a by-product of lift due to wingtip vortices; it decreases as airspeed increases and is greatest at low speed and high angle of attack.
- Mach number
- The ratio of true airspeed to the local speed of sound; critical Mach number is the free-stream Mach at which local airflow first reaches Mach 1.
- Dirty dozen
- Twelve common human factors contributing to maintenance error, including fatigue, complacency, pressure, distraction, lack of communication and lack of resources.
- Hypoxia
- A deficiency of oxygen reaching body tissues, producing euphoria, impaired judgement, headache and cyanosis; effects worsen with increasing altitude.
- GCAA CAR-66
- The UAE General Civil Aviation Authority regulation defining aircraft maintenance licence categories A, B1, B2 and C, and their knowledge and experience requirements.
- Airworthiness Directive
- A mandatory instruction issued by an airworthiness authority requiring specific inspections or modifications to be embodied within a stated compliance time.
- CAR-145
- The regulation governing approval of maintenance organisations, defining facility, personnel, tooling and quality system requirements for certifying maintenance.
- Compressor surge
- A condition in which airflow separates from compressor blades causing reverse flow and violent pressure fluctuations, prevented by bleed valves and variable guide vanes.
- Cabin pressurisation
- A system that maintains a controlled cabin altitude by regulating the outflow valve, keeping cabin differential pressure within the aircraft's structural limits.
- Translational lift
- Additional rotor thrust gained in forward flight as the rotor moves out of its own downwash, typically becoming effective above about ten to fifteen knots.
- Dissymmetry of lift
- The unequal lift between advancing and retreating blades in forward flight, compensated by blade flapping and cyclic feathering to balance lift.
- Bernoulli's principle
- Along a streamline in steady flow, an increase in fluid velocity is accompanied by a decrease in static pressure, explaining aerofoil lift generation.
- Parallel resistance
- For resistors in parallel, the reciprocal of total resistance equals the sum of the reciprocals of the individual resistances; voltage is common across all.
- Three-phase star relation
- In a star-connected three-phase system, line voltage equals the square root of three times phase voltage, while line current equals phase current.
- Pythagoras theorem
- In a right-angled triangle, the square of the hypotenuse equals the sum of the squares of the other two sides, expressed as c² = a² + b².
- Kinetic energy
- The energy possessed by a body due to its motion, calculated as one half multiplied by mass multiplied by velocity squared (½mv²).
- Newton's second law
- The acceleration of a body is directly proportional to the net force acting on it and inversely proportional to its mass, expressed as F = ma.