Engine driven accessories

Question 1

Function of an engine driven generator

Answer 1

Generators supply electrical power to the aircraft system and to charge the battery

On some aircraft the generator maybe used as a starter motor

Question 2

Use and operation of hydraulic pumps

Answer 2

Used to supply hydraulic pressure for aircraft system use

Maybe electrically driven or driven through an accessory drive gearbox by the engine

Used to operate systems such as flight controls, flaps, landing gear, nose wheel steering and brakes

Question 3

Bleed air system

Answer 3

Most modern aircraft use compressed air bleed off the gas turbine engine

Yeah is supplied by ducked into various parts of the aircraft for use in systems such as

aircraft starting 
air conditioning 
wing De icing 
engine anti-ice 
weapons Bay heating

Question 4

Function of a propeller

Answer 4

Converts rotational motion into thrust

Pressure difference is produced between the forward and rear surfaces of the aerofoil shape blade