15.19 Powerplant Installation Flashcards
What is the purpose of firewalls in aircraft engines?
To isolate the powerplant from the airframe structure in case of fire and heat during engine operation
Firewalls are typically made from stainless steel or high heat-resistant metals.
What materials are firewalls typically made from?
Stainless steel or other high heat-resistant metals
Firewalls are designed to withstand high temperatures.
What is referred to as the powerplant in an aircraft?
The engine and its accessories, including the gearbox, fuel control, intake cowling, exhaust, thrust reverser assembly, fire protection equipment, and more.
What are the two common types of powerplant installations?
Wing-mounted and fuselage-mounted
Wing-mounted installations dominate air transport aircraft design.
What classification is given to compartments that contain ignition sources?
Fire zones
Examples include engine cases around the compressor, combustor, and turbine sections.
What is the function of engine cowls?
To protect the engine and its accessories from the operating environment and to provide a streamlined surface.
What is the common name for thrust reverser cowls?
‘C’ ducts.
What is the primary disadvantage of using acoustic liners in engines?
Increased weight and fuel consumption due to friction.
What loads do forward engine mounts carry?
Vertical, side, and axial (thrust) loads.
What must be ensured when replacing or repairing a fuel line?
All fittings must be compatible with their mating parts.
What should be checked regularly on hydraulic lines?
Fluid loss or leaks.
What are control cables and rods used for in powerplant installations?
To activate accessories such as the fuel control unit.
What is the purpose of dedicated lifting points on engines?
To safely lift the weight of the engine.
Fill in the blank: The main components of a drain system include the ______ and the lower part of the module assembly.
drain lines which collect the fluids.
True or False: The ‘C’ duct can be easily opened for maintenance using a hand-operated hydraulic pump or an electric pump.
True.
What must be avoided when routing wiring in aircraft?
Routing in areas where they can be damaged or used as handholds.
What is the purpose of using grommets and chafe strips in wiring?
To provide extra protection against damage.
What is critical to ensure when inspecting drains in a powerplant installation?
They are open and clear of debris.
What can leaks from hydraulic pump drive pads indicate?
Oil or hydraulic fluid leaks.
What should be done when a flexible line is replaced?
Use the same type, size, part number, and length as the line to be replaced.
What is a common feature of engine mounts to allow for thermal expansion?
Spherical bearings or rubber bushings.
What is the role of acoustic panels in turbine engines?
To suppress noise associated with turbine engine operation.
What should be done to prevent fuel lines from chafing against control cables?
Ensure physical separation and secure clamping.
What must be ensured when disconnecting and reconnecting hoses, tubing, and pipes?
Follow the manufacturer’s instructions.
What should the minimum radius for bends in wire groups or bundles not be?
Less than 10 times the outside diameter of their largest wire.
What is the purpose of the drain mast in an engine?
To take fluids overboard.
