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Aviation Maintenance Powerplant Chapter 4
Oral questions
11
Aviation
Undergraduate 2
02/13/2014

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Term
Why are compressor washes performed and what methods are commonly used?
Definition
To remove and contaminants from the compressor section and improve engine performance. The fluid wash and abrasive grit wash are commonly used
Term
How can you tell if a turbofan or turbojet engine is out of trim?
Definition
There will be a high exhaust gas temperature at the target engine pressure ratio for takeoff power.
Term
Name the different types of compressor blade damage that may be found during inspection
Definition
Dents, cracks, galling, pitting, scratches, burrs, burns, gouges.
Term
What kind of markers can be used to mark the in hot and cold sections during repair?
Definition
Layout dye, felt tip marker, chalk
Term
How does relative humidity affect turbine engines?
Definition
Negligible effect
Term
What criteria determines replacement of life limited turbine engine components?
Definition
Cycles, hours and/or calendar time.
Term
If turbine blades are removed from the turbine disc, why should they be re-installed in the same location?
Definition
To maintain the balance of the turbine engine wheel
Term
How are gas turbine engine tachometers calibrated?
Definition
They are calibrated in percent r.p.m.
Term
On a turbine engine, what is the engine pressure ratio and what does it indicate?
Definition
It is the ratio between the total inlet pressure and total turbine exhaust pressure and is used to indicate the thrust developed by the engine
Term
On a turbine engine, what does the exhaust gas temperature (EGT) indicate and how is it obtained?
Definition
EGT is the average temperature of the turbine discharge gasses and is obtained by thermocouples placed near the turbine exit
Term
Can the EGT system on a turbine engine be checked without running the engine?
Definition
Yes, by checking the resistance of the thermocouples and circuits.
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