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What are the 3 key pieces of information in the maintenance manual?
- Notes-general info
- Cautions-may damage part or aircraft
- Warnings-may cause serious injury or dealth
What are two forms of airworthiness limitations?
- Time Life's
- cycle Limits (which ever comes first)
What are two types of inspections?
Schedualed and Unschedualed
In the ATA codes, where are unschedualed inspections located?
What is the difference between ball and roller bearings?
roller for alignment and radial loads, ball for thrust
Why would you clean the compressor everyday?
what would be another reason to clean the compressor?
- done daily if in salt water environment
- done if comp isn't making power
What should be done before cleaning the compressor?
Disconnect the Pc, keeps soap out of the fuel system
What can be done to a rotor blade if damage has occoured on the bottom 1/3 of the blade?
upper 2/3 of the blade?
- bottom 1/3-nothing, blade is unserviceable
- upper2/3-damage must be blended to reduce stress risers
What does the rotor compressor case ride on?
Plastic vane bands
How is the Pc filter sealed?
sealed by an o-ring, has arrows for the direction of flow
What does the compressor turbine coupling attach too?
compressor turbine to compressor shaft coupling, slides inside
What units are contained on a typical AGB?
- oil pumps
- torquemeter piston assembly
- chip detectors
Name 5 compents that are driven off the N1?
- Tach generator
- starter generator
- Fuel control compents
- oil pump
- N1 governor
How is the PRV set?
how is it safetied?
- Spring pressure set
- (maintenance adjusted, washers)
- lockwired both ways because its in the middle of travel
Where does oil go that has been bypassed?
back to the pump
What are the two reasons for doing a oil change?
- as per MM ch8
- oil contamination, bearing or gear wear on chip detector
Explain how a Torquemeter measures torque?
- Thrust on helical cut gear
- the push on the bearing change oriface size, creates pressure differential
How do you check/calibrate a torquemeter?
with a dead weight tester
What are the 3 main components of the Combustion Section?
- discharge tubes
- outer combustion case
- combustion liner
What type of seal is located on the Allison 250 discharge tubes?
- metal to metal
- (dents cause failure to expansion and contraction due to heat and pressure)
fWhen inspecting the outer combustion case, where is the most likely place to observe cracking?
on welds, on bends and inside around holes and louvers
What is the primary cause for engine failure?
What is typically inspected in a hot section inspection?
- combustion liner
- 1st stage nozzle
- 1st stage wheel
Where is carbon likely to build up inside the engine? and why?
carbon is likely to build up in the labyrinth seals and around bearings, caused by oil
What is the point of running the engine at ground idle for around 2 minutes after a flight?
oil continues to flow over bearings, cools bearings up to 200 deg fert
What is a safety precaution that must be observed when dealing with the PT-6 ignition system to prevent electrical shocks?
allow 5 minutes for the electrical dissipation following ignition operation or test
In a Barfield test, what are the 3 things that it is testing?
- temp accuracy
After landing on the ground, cooling down your engine prevents?
using lube on a fastener would make it?
In a turbine engine, what is define as the flange?
where engine can be split and taken apart
What would you like to do?
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