Module 15.19 Powerplant Installation Flashcards
What is a firewall?
A partition between the engine powerplant installation and the aircraft.
What are firewalls typically made of?
Stainless steel or some other high heat-resistant metal.
Why are fan and thrust reverser cowls attached to the engine?
To protect the engine and its accessories from the operating environment and to provide a streamlined, aerodynamic surface.
What do cowlings route?
Cooling air
Where are clowlings attached to?
The nacelle support frame.
What are cowlings secured with?
Several latches along the 6 o’clock centreline
How can fan cowls be closed?
Hand or electric pump
What are ‘C’ duct cowls known as?
Thrust reverser cowls.
What are ‘C’ duct cowls secured to?
Nacelle mounting strut.
How can ‘C’ duct cowls be opened?
Hand-operated hydraulic pump or electric pump.
What is used to suppress the noise from the fan stage of a high by-pass ratio engine?
Noise-absorbent liners (acoustic panels).
What are the disadvantages of using acoustic liners?
Add weight and increase fuel consumption.
What are ‘C’ duct cowls lined with?
Honeycomb panels as acoustic lining.
What do the engine mounts allow for?
Expansion in both the radial and axial directions.
How are engines connected to the pylon?
Front and rear brackets attached to links at the top front and rear of the engine.
Where on the engine is the front mount point located?
Compressor case
Where on the engine is the rear mount point located?
Exhaust/turbine case
What loads do the forward engine mounts carry?
Vertical, side, and axial (thrust)
What loads do the rear engine mounts carry?
Vertical and side
What type of bearing do the main mounting bolt/trunnion assemblies have?
Spherical bearings
Why are spherical bearings used in mounting bolt/trunnion assemblies?
To allow for expansion and torque.
What is provided for the attachment of dedicated equipment for engine removal?
Slinging points
What is the minimum radii for bends in wire groups or bundles?
No less than 10 times the outside diameter of their largest wire.
Where are drain masts located?
Lower part of the module assembly.
What do drain masts do?
Takes fluids overboard.
What do drain collector assemblies do?
Keeps fluid leaks in small tanks.
What do drain lines do?
Collect fluids and vapour from any point where lines and components may leak, or where fluid can accumulate in cavities.
What is the difference between cowl and cowling?
No difference
