M15.21 Operation and Monitoring Flashcards
What are the circumstances when maintenance personnel are required to operate a gas turbine engine?
- Confirming a flight crew reported fault
- Post-maintenance basic engine or aircraft system checkout
- Deterioration of engine performance
- Aircraft control linkage wear
- Moving an aircraft from one maintenance location to another
- To taxi-check an aircraft system
What types of engines do the engine operating procedures apply to?
- Turbofan
- Turboprop
- Turboshaft
- Auxiliary Power Units (APU)
What must be checked before any engine start?
The engine air inlet must be checked to confirm free movement of the compressor and turbine assembly, and that the engine run-up area is clean and free of Foreign Object Debris (FOD)
How is a turbofan engine controlled?
By one control thrust lever for each engine
What must be ensured before starting the engine?
- Undercarriage is down and locked
- Engine oil levels are satisfactory
- All panels are secure
- Sufficient fuel for the ground run
- Intakes and exhausts are inspected for foreign objects and damage
What is the appropriate fire extinguisher needed during engine ground running?
CO2 fire extinguisher
What must be done during engine start monitoring?
- Engine speed indicator (tachometer)
- Oil pressure
- Exhaust Gas Temperature (EGT)
What is the recommended cool-down time before shutting down an engine that has been operated at high power levels?
5 minutes at idle power
What does the Engine Pressure Ratio (EPR) indicate?
The thrust output of the engine
What are the indications used for engine monitoring?
- Engine Pressure Ratio (EPR)
- Rotor speed, N1 and N2 (and N3)
- Fuel Flow (FF)
- Exhaust Gas Temperature (EGT)
What is the purpose of torque monitoring systems in turbo-prop or turbo-shaft engines?
- Indicate power developed by the engine
- Automatically operate the propeller feathering system
- Assist in the automatic operation of a water injection system
- Limit engine power output
- Balance power output between engines
What is the function of the Aircraft Condition Monitoring System (ACMS)?
To record operating parameters and generate reports for engine trend monitoring
What is the purpose of oil analysis in engine monitoring?
To provide information about the condition of the engine by identifying wear particles in the oil
What is the Spectrometric Oil Analysis Program (SOAP)?
A process used to detect wear particles in engine oil
What are the four primary groups of magnetic particles?
- Swarf
- Magnetic fines
- Metal flakes
- Chip
Fill in the blank: The ___________ must be checked to confirm sufficient fuel for the ground run.
fuel tanks
True or False: It is acceptable to start the engine without ensuring that the areas in front and behind the aircraft are clear.
False
What is the purpose of the torque meter in a turbo-prop or turbo-shaft engine?
To provide continuous indication of the horsepower output of the engine
What is required to identify metal particles in engine oil?
Spectrometric Oil Analysis Program (SOAP)
What must be established with the ground crew before starting the engine?
Communications for clearance and safety confirmation
What is the significance of monitoring Exhaust Gas Temperature (EGT)?
To recognize and prevent overheating conditions
What happens if the EGT exceeds the red line?
Immediate inspections of the critical engine are required
What is the role of the Data Management Unit (DMU)?
To record and compile ACMS reports
What should be done if abnormal deteriorations in engine efficiency are detected?
Schedule engine removal before the defect fully develops