Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Powerplant > Chapter 3 Midterm > Flashcards

Chapter 3 Midterm Flashcards

1
Q

A blank is defined as one takeoff and landing.

A

Cycle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What three elements in order are needed to start a gas turbine engine

A

Starter, ignition, fuel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

During gas turbine engine starting the most critical parameter is?.

A

Egt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Please indicate two variations of a bore scope.

A

** flexible and ridged **

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

If the engine fails to self accelerate or does not reach idle rpm position the engine is said to have had a ?.

A

Hung start.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define hot start

A

Is indicated if the exhaust gas temp exceeds specified limits.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are two methods for permanently marking aircraft turbine parts?.

A

Laser etching, engraving

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Please list and define the different part tags and their associated color coding.

A

Red- not airworthy, green-repair, not airworthy, yellow- good/airworthy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What type of starter is generally used for small turbine engines

A

Starter generator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What type of starter is generally used for large turbofan engines

A

Air turbine starter uses bleed air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Please define engine trim

A

A maintenance procedure in which the turbine engine fuel control is adjusted

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is dry trim?. Wet trim?

A

Dry trim- no water. Wet trim- water injection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is a partial power stop

A

Trim tool used to adjust fcu

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is meant by a remote trimmer

A

Trim tool used to remotely adjust fcu

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When is trim normally accomplished please give four examples

A

Major fuel comp, R&R, engine change/overhaul, failed power assurance check, pilot write up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is trend analysis and how is it used with turbine engines

A

Engine performance monitoring over a period of time looking for anything unusual.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is FOD

A

Demise caused by engine ingestion of foreign materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

List the steps of the overhaul process

A

Receiving, tear down, cleaning, inspection, repair, re assembly, testing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Common repairs made during engine overhaul process

A

Thread repairs, blending, tubing repairs

20
Q

What is a helicoil insert used for

A

Thread repair

21
Q

What is a labyrinth seal

A

Oil seal

22
Q

Three types of non destructive inspection techniques used during turbine overhaul

A

Mag particle, dye penetrant, ultrasonic, eddy current

23
Q

What is the purpose of balancing the rotating assemblies of an engine

A

Eliminate vibration

24
Q

What are three methods used to balance the rotating within the engine

A

Blade mapping, dynamic balance, static balance

25
Q

What parts of a turbine engine are balanced

A

Rotating assemblies

26
Q

What is blade mapping

A

Locate/ match blade weights and install on opposite ends of the disc

27
Q

What are stress rupture cracks and where are they commonly found

A

Hot section perpendicular to the le/te

28
Q

What is blade creep and where would you typically find this condition?

A

Permanent elongation of turbine wheels

29
Q

What are the atmospheric conditions that affect thrust output

A

Temp, density, pressure

30
Q

CDP

A

Compressor discharge pressure

31
Q

TIT

A

Turbine inlet temp

32
Q

EGT

A

Exhaust gas temp

33
Q

CIT

A

Compressor inlet temp

34
Q

EPR

A

Engine pressure ratio

35
Q

Pb

A

Burner pressure

36
Q

Pt7

A

Total pressure at station 7

37
Q

Dry motoring

A

Dry turning the engine with ignition but no fuel

38
Q

Wet motoring

A

Turning the engine with fuel but no ignition

39
Q

Define hung start

A

Engine fails to reach self acceleration

40
Q

Define hot start

A

Where the engine starts but exceeds egt limits

41
Q

Purpose of a hot section inspection

A

Check integrity of turbine, combust ears, and exhaust for cracks and distortion

42
Q

Common types of damage that occurs in the hot section

A

Cracks

43
Q

Manufacturers base engine overhauls based on operating hours or

A

Cycles

44
Q

Why is it important to not mark the hot section with a lead pencil

A

Causes cracks

45
Q

Engines are normally disassembled horizontally or?

A

Vertically

46
Q

Describe long term preservation process

A

Place silica bags, close all ducts, drain oil, add preservation oil, remove engine place in sealed container with humidity card

Powerplant (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions