Engine monittoing and Ground Monitoring Flashcards
What’s the main reason for maintenance personal to operate a GTE
Confirming a flight crew reported fault
Where do u positon aircraft
Into wind , fit chocks and apply brakes
What do you inspect intakes and exhausts for
Fod , damage , freedom of rotation and exhausts are clear
Why must engines be ran on both wings
Prevent asymmetry problems
Why should you engine power not be increased above idle
Engine heating up and cooled down reduces service life
What is trimming
Pulling the throttle lever at idle speed and maximum thrust
How do we achieve accurate trim data
Operating ambient temperature and barometric pressure/airfield altitude is required
When are engine adjustments made
At idle rpm
Why is idle adjusted
Ensure that the engine idles at its lowest rpm authorised by manufacturer
Where are final trim adjustments made
In increase direction
On accretion checks what’s used as the datum
The oldest engine
After engine run how long do you run the engine in idle before closing hp valve
3 minutes
What is engine pressure ratio
Indication of thrust output
What does fuel fuel do
Monitor fuel consumption during flight
Why do we monitor EGT
Prevent the critical condition of overheat
What are expectations demands of EGT
When it exceeds red line
How do centrifugal compressor engines measure engine power
Comparing relationship between engine rpm and jet pipe pressure
Why can’t axial flow bypass engines use the same method as centrifugal compressor engines to interpret thrust
There is no direct relationship between engine rpm and thrust
How do axial bypass flow engines measure output
Comparison between static ambient pressure and exhaust gas pressure to indicate power output
What’s the torque monitoring system used to indicate
Power developed by a turboprop or turbo shaft engine
What is engine torque
Turning moment
What is engine torque proportional to
Horsepower and is transmitted through propeller reduction gear or power output shaft
What’s the most common type of sensing systems
Hydro-mechanical and electronic
How is torque displayed in the cockpit
Torque oil pressure
Torque percentage
Direct horse power read out
Why do we monitor parameters
Damages can be detected in development phase
How is the data on board the aircraft recorded
Aircraft condition monitoring system
Where is data transmitted to after being recorded
Data management unit
What is a boroscope
Internal visual inspection
Types of horoscope
Ridgit , flexible and electronic
What did we use to measure vibration
Piezoelectric accelerometers
How many and Where is accerlemetere installed
2 , One of fan case one of loop
What unit do piezoelectric accelerometers measure in
Inches per second or millimetres per second
What is hard time
Preventative process which involves the removal of items for overhaul or replacement at specified intervals
Hard time component failure would cause what
Affect airworthiness
What do the hard time intervals depends on
Number of landings or cycles
What is on condition
Process that involves inspection , test or check if an item at specified periods
What is scheduled servicing
Periodic recurring checks
What is unscheduled servicing
Work cause by malfunction or occurrences not related to time limits
What is condition monitoring
Information gained by operational experience
3 methods of ground monitoring
Flight deck indicatations
Inflight recorders
Ground indicators
Why do we inspect engine compressor
Ensure damage has not occurred
What do customary mechanical and aerodynamic imbalances cause
They generate vibrations / stalls or surges
What does accumulation of contaminants in compressor and turbine section do
Reduces efficiency of engine which affects performance
Why do we do a deslalinstion wash
Rinsing compressor with fresh water to get get rid of salt ingestion
If we can’t use a desalination wash what do we do
Perform a performance recovery wash
What treatment do we use on central compressor engines
Abrasive grit
What form is the grit
Walnut shells
What’s an abrasive method used to clean fan blades
Spraying coke into eye of fan while rotating
If non metallic damage is found where in the amm can help
Chapter 71
