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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
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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
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There will be a high EGT at the target EPR for takeoff power
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Name the different types of compressor blade damage that may be found during inspection
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1. Dents
2. Cracks 3. Galling 4. Pitting 5. Scratches 6. Burr's 7. Burns 8. Gouges |
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What kind of markers can be used to mark the parts in hot and cold sections during repair
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1. Layout dye
2. Felt tip marker 3. Chalk |
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How does relative humidity affect turbine engines
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Negligible effect
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What criteria determines replacement of life limited turbine engine components
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1. Cycles
2. Hours 3. Calendar time |
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If turbine blades are removed from a turbine disc, why should they be reinstalled in the same location
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To maintain the balance of the turbine wheel
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How are gas turbine engine tachometers calibrated
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They are calibrated in percent RPM
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On a turbine engine, what is the engine pressure ratio and what does it indicate
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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
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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
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Yes, by checking the resistance of the thermocouples and circuits
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