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