Turbine Engine Operation, Instruments, Maintenance, and Overhaul Flashcards Preview

Powerplant Orals > Turbine Engine Operation, Instruments, Maintenance, and Overhaul > Flashcards

Flashcards in Turbine Engine Operation, Instruments, Maintenance, and Overhaul Deck (11)
Loading flashcards...
1
Q

Why are compressor washes performed and what methods are commonly used?

A

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

2
Q

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

A

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

3
Q

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

A

Dents, cracks, galling, pitting, scratches, burrs, burns, and gouges.

4
Q

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

A

Layout dye, felt tip marker, and chalk.

5
Q

How does relative humidity affect turbine engines?

A

Negligible effect.

6
Q

What criteria determines replacement of life limited turbine engine components?

A

Cycles, hours, and/or calendar time.

7
Q

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

A

To maintain the balance of the turbine wheel.

8
Q

How are gas turbine tachometers calibrated?

A

They are calibrated in percent rpm.

9
Q

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

A

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.

10
Q

On a turbine engine, what does exhaust gas temperature indicate and how is it obtained?

A

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

11
Q

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

A

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