Transmissions
What is the primary function of the main rotor gearbox?
Transmit engine power to the main and tail rotors
What is the primary purpose of baffles in fuel tanks?
To resist fuel surging caused by changes in helicopter attitude
What is the primary function of a hydraulic pump?
To move fluid through the system
What is the main consideration for choosing materials for cabin linings?
Fire resistance
What is the purpose of aligning the red dot on a tubeless tyre with the valve stem?
To act as a slippage marker.
What is the purpose of the magnetic chip detectors in the gearbox?
To detect loose metal chips or particles in the oil system
What is the primary safety precaution during defueling operations?
Ensure all electrical power is OFF
What is the purpose of a relief valve in a hydraulic system?
To prevent overpressure damage
What type of harness is typically used by flight crew?
Five-point harness
What is the primary function of a squat switch in helicopters?
To sense whether the helicopter is airborne or on the ground.
What material is used to prevent corrosion on rotor masts?
Cadmium plating
What is the function of a check valve in a fuel system?
To prevent backflow of fuel
What is the function of an accumulator in a hydraulic system?
To store pressure for emergency use
What does an Emergency Locator Transmitter (ELT) do?
Transmits a distress signal during an aircraft emergency
What is the function of the oleo (air-oil) shock strut in landing gear systems?
To absorb landing impacts and dampen taxi shocks
What is the function of the lash check during transmission reassembly?
To verify gear condition and assembly accuracy
What is the primary purpose of a fuel quantity processor unit?
To calculate fuel weight
What is the primary function of a hydraulic fuse?
To block the line in case of a serious leak
What is the typical weight limit for a helicopter winching system?
270 kg
What is the primary advantage of retractable landing gear in helicopters?
It streamlines the helicopter during flight.
What does the mast in a helicopter do?
Absorbs torsional and tension loads from the engine torque and helicopter weight
What is the purpose of a compensator in a fuel quantity indicating system?
To minimize errors caused by changes in the dielectric constant
What is the purpose of a differential pressure indicator (DPI)?
To warn of impending filter blockage
What is a common cause of uncommanded firing of winch emergency cable cutters?
Electromagnetic interference
What is the purpose of skid shoes attached to the skids?
To dampen vibrations and eliminate ground resonance.