15.9 PWERPLANT ASSEMBLY👌🏼 Flashcards
What is a firewall
Partition between engine powerplant installation and the aircraft
Firewall function
Isolate powerplant from airframe structure in case of fire and heat
What are firewalls typically made out of
Stainless steel
Why do engine pods incorporate zones
- to minimise the probability of a fire and to isolate a fire
What is the function of a fire blanket
Protect against a fire or overheating
Compartments that contain ignition sources and the potential for flammable fluid leakage are classified as
Fire zones
Why are firewalls used in helicopters
To ensure engine is separated from adjacent engine or main gearbox
Why are fan and reverser cowls attached to the engine
-Protect engine and its accessories from environment
- streamlined surface
Where is the cowling attached to
Nacelle support frame
How is the cowling secured
- several latches along 6 o’clock centreline
How can the hinged cowl be opened and closed
- hand
- electrical pump
What are the thrust reverser cowls commonly referred as
C duct
Explain acoustic panels
- noise absorbent liners around inside wall
What is the disadvantage of using acoustic liners
- weight and increased fuel consumption due to friction increase
Why mustmountings be designed to allow expansion in radial and axial directions
Allow for thermal expansion
On side mounted engines, the front and rear saddle type beams are connected through
Fillets to the airframe
How are the beams connected to the engine mounting points
Swinging links
Thrust trunnions
Thrust strut connected to air frame
Where must wire bundles be routed
- accessible areas that are protected from damage and maintenance activity
What is the minimum radii for bends in wire groups or bundles
> =10 times of outside diameter of the largest wire
When removing or replacing turbine engines, what is used to raise and lower engine
- lifting points
Why do we use lifting points
To safely lift the weight of the engine
What are the main components of a drain system
- drain lines (which collect fluids)
- module assembly (where drain line ends)
What does the lower part of the module assembly consist of
Drain mast which takes fluid overboard
Explain drain collector assembly (manifold module)
- assembly that keeps fluid leaks in small tanks
