15.19 Powerplant Installation Flashcards
(20 cards)
What is the powerplant installation?
The engine and all components connected on the engine side of the firewall
What is the purpose of firewalls?
Isolate the powerplant from the airframe in case of fire.
What are the three types of zones?
Fire zones: Areas with flammable fluids and ignition sources
Leakage zones: Areas where flammable liquids may be present but no ignition source
Dry bays: Compartments adjacent to fire zones, designed to remain dry. Often protected by firewalls
What are ‘C’ duct cowls and their function?
Cowls covering the thrust reverser system; provide access and house actuators.
What are fan cowls and their purpose?
Cover and protect the front fan section of the engine.
What are the general purposes of cowls?
Protect the engine from the environment, guide cooling air, and streamline airflow.
What is a drawback to acoustic panels?
They add weight and slightly increase drag (air resistance).
Whats the purpose of engine mounts?
Secure the engine and transfer its weight and thrust to the aircraft structure.
What loads do forward mounts take?
take vertical, side, and axial (thrust) loads.
What loads do rear mounts take?
take vertical and side loads only.
What bearings are used in engine mounts and why?
Spherical bearings or rubber bush bearings
To allow for thermal expansion and absorb vibration
What is important when installing or replacing fuel lines?
Ensure compatibility, avoid chafing, and secure properly.
Where are engine mounts mounted?
On the compressor and turbine casing
What protection can be used against wire damage?
Grommets
chafe strips
conduits
What is the minimum bend radius of wires in groups or bundles?
10× wire diameter (6× at breakouts or where they reverse direction if supported)
What are the three components of the drains system?
Drain Lines: Route leaked fluids.
Drain Module/Manifold: Collects fluid from various lines.
Drain Mast: Discharges fluids overboard.
What are control cables and rods used for?
To activate accessories such as the fuel control unit
When changing engines these usually remain with the aircraft
What must be done to wiring routed across hinged panels?
must be routed and clamped so that the bundle will twist, rather than bend, when the panel is moved.
How are side mounted engines mounted?
Mounted using front and rear saddle type beams
Beams are connmected to the aircraft using swinging links and thrust trunnions
thrust strut transfers engine thrust to the airframe structure.
Fillets help blend and support the connection points structurally
How are pylon mounted engines mounted?
- front and rear brackets attached to links at the top front and rear of the engine
- engine itself has mounting points on front compressor casing and turbine or exhaust
