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