15.19 Flashcards
What PowerPlant instillation is most common in commercial air transport
Wing mounted
Function of a firewall
Isolate the power plant from the airframe structure in case of fire or heat from normal engine operation
Firewall material
Sheet metal shields from stainless steel or high heat resistant material
What do you need to be classed as a fire zone
Ignition sources and potential fluid leakage
What do fan and thrust reverser cowls do
Project engine and accessories from operating environment and give a streamlined aerodynamic surface
How is a cowling secured
Several latches along the 6 o’clock centreline
What are thrust reverser cowls referred to as
C ducts
What’s a disadvantage to using acoustic liners to reduce noise levels
Addition of weight and increased fuel consumption due to increased friction of the duct walls
What are c ducts lined with to reduce noise
Honeycomb panels
How do engines need to be mounted to the aircraft
A way that weight and thrust developed is transmitted through aircraft structure and mountings
How are pylon mounted engines connected
To the pylon by front and rear brackets attached to link at the top of the airframe
How are pylon mounted engines connected
To the pylon by front and rear brackets attached to links at the top of the airframe
What loads do toward engine mounts carry and why
Vertical , side and axial (thrust)
Allow thermal expansion
What should you inspect hydraulic lines and fittings for
Evidence of fluid loss or leaks
If wires contacting the aircraft structure is unavoidable what protection methods can be used
Grommets and chafe strips
Why do wires need routing away from high temperature equipment
Prevent deterioration of insulation
What is minimum Bend radii for wire groups and bundles
Not be less then 10x the outside diameter of the largest wire
What 2 times can wires be bent 6x
Outside diameter at breakout points
Reverse direction if suitably supported
2 Components of a drain system
Drain lines to collect fluid
Module assemble where drain lines end
What does a drain mast do
Takes fluids overboard
What does the manifold module/drain collector assembly do
Keeps fluid leaks in small tanks
How can thrust reverser and fan cowls be opened for maintenance
Hand operated hydraulic pump or an electric pump
