Turbine Engine Operation, Maintenance, Inspection And Overhaul

Front 1

What are the possible causes for a turbojet or turbofan engine having high exhaust gas temperatures, low RPM, and high fuel flow at all engine pressure ratios?

Back 1

Turbine damage or loss of turbine efficiency do to wear.

Front 2

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

Back 2

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

Front 3

How can you tell if a turbo fan or turbo jet engine is out of trim?

Back 3

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

Front 4

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

Back 4

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

Front 5

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

Back 5

Layout dye, felt tip marker, Chalk.

Front 6

How does relative humidity affect turbine engines?

Back 6

Negligible affect.

Front 7

Why are hot section inspections performed by turbine engines?

Back 7

To determine the integrity and wear of the hot section components.

Front 8

When inspections must be performed following a turbine engine overspeed?

Back 8

Refer to the engine manufacturers maintenance manual for the required procedures.

Front 9

What inspections must be performed on a turbine engine if the exhaust gas temperature exceeds limit?

Back 9

A hot section inspection.

Front 10

Where are life limited parts of an engine listed?

Back 10

Engine maintenance manuals, type certificate data sheet, and the airworthiness limitation section of the instructions for continued airworthiness.

Front 11

What criteria determines replacement of life limited turbine engine components?

Back 11

Cycles, hours/or calendar time.

Front 12

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

Back 12

To maintain the balance of the turbine wheel.

Front 13

Where can Engine operating limits be found?

Back 13

Engine manual, engine specification, type certificate data sheet, and aircraft manufacturers maintenance manual.

Front 14

What FAA approvals are required when installing an engine that is not on the aircraft type certificate?

Back 14

An STC (supplemental type certificate) or an FAA field approval.

Front 15

Under what conditions is compliance with an engine service bulletin mandatory?

Back 15

When an airworthiness directive references the service bulletin or when compliance is part of the approved operating specifications for a commercial or air carrier operator. When engine or component overhaul procedures require compliance at time of overhaul.

Front 16

What is fan blade shingling?

Back 16

It is the overlapping of the mid span shrouds of the fan blade.

Front 17

When a turbo fan what turbo jet engine is shut down, what should a mechanic listen for doing coastdown?

Back 17

Any rubbing sound or other unusual noises from the engine.

Front 18

How are gas turbine engine tachometers calibrated?

Back 18

They are calibrated in percent rpm.

Front 19

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

Back 19

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.

Front 20

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

Back 20

EGT is the average temperature of the turbine discharge gases and is obtained by thermal couples place near the turbine exit.

Front 21

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

Back 21

Yes, but checking the resistance of the thermal couples and circuits.