M15.19 Flashcards
What are engine firewalls made from?
Steel or titanium
What are the fan reverser cowling and the core cowling sections sometimes called?
Thrust reverser cowling
What are allowed in aerodynamic smoothness class 1?
Very small dents
What areas of the engine nacelle has smoothness class 1?
The inlet and the outlet
What areas of the engine nacelle has smoothness class 2?
The fan and reverser cowlings
What is the only cowling that cant be split apart?
Air inlet cowling
What cowling must always be opened first?
The fan cowling
What is used to make sure the air inlet cowling is installed properly?
2 index pins
What are the rods called that keep the cowlings open?
Hold open rods
What cant happen hen the cowlings are open?
Towing of the aircraft
What is the fan reverser cowling normally made from?
Steel and titanium
How do you open the fan reverser cowlings?
With assistance from a hydraulic pump due to its weight
What are the two passive methods cowling give protection from fire?
- fire protective coating on the inner side
- fire seal on the connection to the fan frame
What is the fire seal of the fan thrust reverser made from?
Titanium with a heat resistant silicon layer
When does the pressure relief door open?
When there is an overpressure which overcomes the spring
What keeps the pressure relief door closed?
A spring
What stops the pressure relief door from flying away during flight?
A lanyard
What must be done if a pressure relief door is found opened?
Check all the components behind the cowling for air leak
What are engines called when mounted on the left or right of the aft fuselage?
Side-mounted engines
What is an engine called when it is in the tail section?
Stabiliser-mounted engine
How many engine mounts are there?
2
What are the engine mounts called?
Forward mount and aft mount
Where is the forward mount connected?
The fan frame
Where is the aft mount connected?
The turbine frame
What mount takes the thrust loads and why?
The forward mount takes the loads because of axial thermal expansions of the engine can be more than 20mm
How is a turbo-prop engine secured to the upper nacelle structure?
By a resilient rubber mount which reduces vibration and torque effects
What should happen if cracking or pitting is found on the engine mount?
It should be rejected
What if heat or fluid deterioration is found on the turbo-prop resilient rubber?
It should be replaced
How far should pipes be positioned from fixed structures?
6mm
How far should pipes be positioned from control and rigid moving parts?
18mm
How far should pipes be positioned from control cables?
25mm
Why are pipes required to be a certain distance away from certain lines?
To prevent chafing from movement or vibration
What are feeders?
Cables/wires that take power to or from components
What is a connector?
A device that is semi-permanent between electrical cables
How far apart should bundling of a wire take place in an engine?
Every 2inches
When a wire enters a connector, what is the distance from the last tie?
6 inches
What are the three methods for an engine change?
- bootstrap method
- overhead crane supporting sling
- uplift loader
What percentage of time is crane support sling method quicker than bootstrap method?
30%
What percentage of time is the uplift method quicker than the bootstrap method?
40%
Why is the uplift loader mouthed not commonly used?
Needs expensive equipment
Is a leakage acceptable?
Yes but check the AMM if its okay
How fast should the airspeed be to force all the leaked fluid out the drain collector?
200knots
