Jeppesen Chapter 4 - Turbine Engine Operation, Instruments, Maintenance, and Overhaul (11 Items) Flashcards

0
Q

Q2. How can you tell if a turbofan or turbojet engine is out of trim?

A

A2. There will be a high exhaust gas temperature at the target engine pressure ratio for takeoff power.

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1
Q

Q1. Why are compressor washes performed and what methods sre commonly used?

A

A1. To remove any contaminants from the compressor section and improve engine performance. The fluid wash and abrasive grit wash are the commonly used.

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2
Q

Q3. Name the different types of compressor blade damage that may be found during inspection.

A

A3. (1)Dents, (2)cracks, (3)galling, (4)Pitting, (5)scratches, (6)burrs, (7)burns, (8)gouges

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3
Q

Q4 What kind of markers can be used to mark the parts in hot and cold sections during repair?

A

A4. Layout dye, felt tip marker, and chalk.

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4
Q

Q5. How does relative humidity affect turbine engines?

A

A5. Negligible effect.

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5
Q

Q6. What criteria determines replacement of life limited turbine engine components?

A

A6. Cycles, hours and/or calendar time.

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6
Q

Q7. If turbine blades are removed from a turbine disc, why should they be re-installed in the same location?

A

A7. To maintain the balance of the turbine wheel.

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7
Q

Q8. How are gas turbine engine tachometers calibrated?

A

A8. They are calibrated in percent r.p.m.

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8
Q

Q9. On a turbine engine, what is the engine pressure ratio and what does it indicate?

A

A9. 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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9
Q

Q10. On a turbine engine, what does exhaust gas temperature (EGT) indicate and how is it obtained?

A

A10. EGT is the average temperature of the turbine discharge gasses and is obtained by thermocouples placed near the turbine exit.

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10
Q

Q11. Can the EGT system on a turbine engine be checked without running the engine?

A

A11. Yes, by checking the resistance of the thermocouples and circuits.

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