Installation Flashcards
How are multiple
Engines identified on the same aircraft
Left (port) engine is No1
Right (Starboard) engine is No2
In what 2 ways can an engine be referred to as
Engine - without any supporting accessories
Engine change unit - containing supporting accessories
What pre installation checks must be carried out before installing a replacement engine
Log cards
Modification state
Checklist - Topic 3
Removed ECU
What checks must be carried out before ground running the replaced engine?
Independent inspections
Loose article check
Fuel flow
Tool control
MoDF700
What are blanks used for and when
To prevent the ingress of dirt and moisture, as soon as pipes or tubes are disconnected
What can lead to misalignment of the engine
Degradation of vibration absorbing materials
What 2 mounts attach the engine to the fuselage
Rear
Forward
What methods can be used to absorb the torque reaction between the engine and airframe?
Twin engine mount
Thrust bar
What is a gimbal ring used for
To connect the engine front mounting and the MRGB support assembly
What is a side stay and its purpose
Used to laterally restraint the engine
Supports lugs on spherical bearings to keep the engine still
What is a vibration mount used for
Carries the vertical weight of the engine, absorbs vibrations travelling to the fuselage
How is vibration minimised through the vibration mount
Rubber dampeners
What should be done before lifting an engine
Examine lifting points on ECU
Pre-use check on lifting tackle
Correct lifting beam
PPE, do not stand underneath
Where are lifting points located on an engine
Located around the centre of balance
What is ground running
Running the engines without flying the aircraft, for great range of testing and maintenance
Why is ground running better than flying the aircraft
Risk to life is much lower
What does a typical ground team consist of
Supervisor
Operator
Safety person
Who will the operator of the ground test be
Pilot
What are the 4 danger areas of a helicopter
Main rotor
Tail rotor
Air intakes
Exhaust
Where should you leave the rotor disk while the engine is running?
12-2
What is blade sailing
Gusts of wind cause the rotor blades to drop below head height while rotating
What are the typical reasons for ground running
Engine testing after installation
Engine testing after component change
Engine accessories testing
Carry out maintenance
Verify faults
What is a wet start
Residual fuel in the combustion chamber following a failed attempt to start
What is a vent run
Using compressor air to blow fuel out of the system. Done using starter motor
