15.19 Flashcards
What loads to the attachment bolts take?
Vertical engine loads via 4 attachments
How are thrust and side loads transferred?
Transferred by shear pins
The support beam is connected to the fan frame by what?
Two thrust links via a cross beam
What is the aft engine mount cross beam connected to?
Connected to pylon by attachment bolts
Connected to engine turbine frame by links at three points
Why does the engine secure to upper nacelle with a resilient rubber mount?
Reduces vibration and torque effects
The engine is supported at the rear by what?
Swingling links
Connectors found on modern aero jet will be of what design?
Bayonet design
How many different threads are on the bayonet design?
Three
The bootstrap method can be used for what type of engine?
Wing mounted engines
Positive and negative of crane supported sling method?
More expensive
30% less time
Positive and negative of uplift loader method?
Expensive special equipment
40% time reduction compared to bootstrap method
Why are control levers shaped and coloured differently?
Identification purposes
Rigging pins should be fitted with what?
A red flag
Why do engines need a drain system?
To take all leakages of fluid directly overboard
Main components of the drain system?
Drain lines
Module assembly
Where is drain mast found and what does it do?
Found at lower part of module
Takes fluid overboard
Fluid leaks are collected from where on gear box?
All drive pad seals on gear box
The most important outlet drains go where?
Overboard so leaks can’t re collect
Why would a leak rate be checked?
Must be checked to decide whether a leakage is acceptable or not
Process of leak rate check?
Disconnect drain lines and out in a small plastic bottle
Do and engine run
Measure amount in bottle compared with AMM limitations
When there is a fuel pump leakage, the fuel will first be collected where?
In the fuel pump collector
When fuel pump collector is full you will get an overflow to what?
The holding tank
The holding tanks are emptied by what?
RAM air
Or manually by spring loaded drain valves
