Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
21 Cards in this Set
- Front
- Back
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? |
Turbine damage or loss of turbine efficiency do to wear. |
|
Why are compressor washes performed and what methods are commonly used? |
To remove any contaminants from the compressor section and improve a engine performance. The fluid wash and abrasive grit wash are commonly used. |
|
How can you tell if a turbo fan or turbo jet engine is out of trim? |
There will be a high exhaust gas temperature at the target engine pressure ratio for takeoff power. |
|
Name the different types of compressor blade damage that may be found during inspection. |
Dents, cracks, galling, pitting, scratches, burrs, burns, gouges. |
|
What kind of markers can be used to mark the parts in hot and cold sections during repair? |
Layout dye, felt tip marker, Chalk. |
|
How does relative humidity affect turbine engines? |
Negligible affect. |
|
Why are hot section inspections performed by turbine engines? |
To determine the integrity and wear of the hot section components. |
|
When inspections must be performed following a turbine engine overspeed? |
Refer to the engine manufacturers maintenance manual for the required procedures. |
|
What inspections must be performed on a turbine engine if the exhaust gas temperature exceeds limit? |
A hot section inspection. |
|
Where are life limited parts of an engine listed? |
Engine maintenance manuals, type certificate data sheet, and the airworthiness limitation section of the instructions for continued airworthiness. |
|
What criteria determines replacement of life limited turbine engine components? |
Cycles, hours/or calendar time. |
|
If turbine blades are removed from a turbine disc, why should they be reinstalled in the same location? |
To maintain the balance of the turbine wheel. |
|
Where can Engine operating limits be found? |
Engine manual, engine specification, type certificate data sheet, and aircraft manufacturers maintenance manual. |
|
What FAA approvals are required when installing an engine that is not on the aircraft type certificate? |
An STC (supplemental type certificate) or an FAA field approval. |
|
Under what conditions is compliance with an engine service bulletin mandatory? |
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. |
|
What is fan blade shingling? |
It is the overlapping of the mid span shrouds of the fan blade. |
|
When a turbo fan what turbo jet engine is shut down, what should a mechanic listen for doing coastdown? |
Any rubbing sound or other unusual noises from the engine. |
|
How are gas turbine engine tachometers calibrated? |
They are calibrated in percent rpm. |
|
On a turbine engine, what is the engine pressure ratio and what does it indicate? |
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. |
|
On a turbine engine, what does exhaust gas temperature (EGT) indicate and how is it obtained? |
EGT is the average temperature of the turbine discharge gases and is obtained by thermal couples place near the turbine exit. |
|
Can the EGT system on a turbine engine be checked without running the engine? |
Yes, but checking the resistance of the thermal couples and circuits. |