15.21 Flashcards
(20 cards)
How far do u need to be from a running engine
10 meters
30 feet
What is engine trimming and when is it done
Done when the engine is running
Thrust set to the same throttle position (same power each side)
Prevents thrust asymmetry
Which engine provides a datum for engine trimming
Oldest engine has this may have less performance
What engine uses jet pipe temp
Centrifugal type
What is thermodynamic analysis
Identifies wear of gas path components
What is mechanical analysis
Vibration caused by fan or turbine rotor
What does the DMU do
Data management unit records records data form ACMS and then compiels a trend report
What is ACMS
Trend monitoring
What is the advantage of ACMS
Predicts failure and can allow for scheduled maintenance
How often are take off reports sent
First 4 takeoffs on new engine
Every 35 flights
What is soap
Spectrometic oil analysis program
Sample oil it’s self as some particles cannot be seen
Types of magnetic particles
Magnetic fines- black sludge (gear box)
Swaf
Metal flakes - bearings
Gearteeth flacks
Where are the engine mounts
Turbine case and ran case
What can be used for seeing cracks on a combustion chamber
Visual dye - penitrent
What do you use to clean a fuel nozzle
Clean with a soft bristle brush
Are cracks permitted on turbine case
No they are not permitted
Where is a stress crack critical on turbine blades
Trailing edge
Where are over temp crack found on turbine blades
Leading edge
How is a compressor cleaned
Fresh water added when dry motoring or idle (known as desalination)
When is a performance recovery compressor wash done
When the desalination wash does not work.
It uses cleaning agents
Normally used on centrifugal type engines
