Brainscape's Knowledge GenomeTM

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


See full index

PT6 TURBINES > TEST > Flashcards

TEST Flashcards

1
Q

What are the three characteristics of the PT6A Engine?

A

Light weight free turbine reverse flow

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

What does Free Turbine mean?

A

An independent system that has no mechanical system and is only powered to driver the compressor turbines.

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

What does Reverse Flow mean?

A

Airflow is circled around 2 times inside the Gas section

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

hat is P3 in the engine?

A

compressor discharge

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

) What is P2.5 in the engine?

A

Interstage Air

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

What does black oil in the engine indicate?

A

It indicates that your carbon seal is deteriorating and depositing the dirt into the oil system. Change the seals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  • Interface between power section and gas generator section
A

Flange C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  • Power turbine vane assembly and power turbine
A

Flange D

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

CT Vane Assembly and shroud housing

A

Flange E

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

access to the compressor

A

Flange F

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

Flange G

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

Which of these flanges may be accessible by an overhaul shop only?

A

Flange A, B, F

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

) Name the type of bearings located from 1 - 6:

A

Ball Roller Roller Ball Roller Ball

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

) What type of loads do Ball Bearings take?

A

axial loads

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

What type of loads do Roller Bearings take?

A

Radial loads

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

) In what direction do the Compressor Turbines turn in?

A

CCW

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

In what direction does the Power Turbine turn in?

A

CW

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

What is the purpose of the master spline on the turbine disks?

A

Maintain balance with the shaft

19
Q

At what percentage of Ng does bleed valve close at?

A

91%

20
Q

What is the purpose and location of the Ng Tach Generator?

A

Purpose: Drives the the compressor in the Gas Generator Section (Gas Producer) - Location: Accessory Gearbox

21
Q

What is the purpose and location of the Nf Tach Generator?

A
  • Purpose: Drives the propeller through the RGB - Location: Reduction Gearbox (RGB)
22
Q

What is the purpose and location of the Breather Impeller?

A
  • Purpose: Vents breathed air overboard - Location: Accessory Gearbox
23
Q

What is the purpose and location of the Fuel Heater?

A

Purpose: Pre-heats the fuel to prevent ice crystal formation - Location: Accessory Gearbox

24
Q

What is the purpose and location of the Fuel Pump?

A
  • Purpose: Boost fuel pressure to supply the fuel to the engine - Location: Inside FCU
25
Q

What is the purpose and location of the Torque-Meter?

A
  • Purpose: Measures torque of rotating shaft - Location: Reduction Gearbox
26
Q

What is the purpose of the Accessory Gearbox?

A
  • To drive the accessories mounted on it.
27
Q

What is the purpose of the Reduction Gearbox?

A

To reduce the RPM for the propeller. It is reduced because of the airframe capacity to take such a speed/RPM

28
Q

) How many stages are in this engine’s gearbox?

A

2 stages

29
Q

What is the gear ratio at 100%?

A

Tach drive runs at 4200 RPM @ 100%

30
Q

How many fuel nozzles are on a PT6? And what type?

A
  • 10 Primary and 4 Secondary - Can be 7 and 7 as well - ALL ARE SIMPLEX
31
Q

What is the job of Oil in the engine?

A

To cool, clean and lubricate the bearings and propeller systems of the engine

32
Q

How much oil is consumed in the engine. Roughly

A

1 qt. In 10 hours of operation (MAXIMUM)

33
Q

How much is the oil pressure in the system?

A

80 to 100 psi

34
Q

What bearings have labyrinth seals on them?

A

1,2,3,4

35
Q

What is the purpose of the ignition system?

A

To provide a heat source/ spark to ignite the air/fuel mixture for combustion

36
Q

What are the 2 types of igniters?

A

Glow Plug - Spark Type

37
Q

What do you do if igniters are dropped?

A

Throw them away and get a new one. Do not reuse as they can be damaged.

38
Q

What must be done to the exciter while servicing?

A

Remove the exciter input lead before the high tension leads

39
Q

What must be always done to the exciter box plugs while servicing?

A

Always cap them off to prevent anything from entering and damaging the box.

40
Q

What is the purpose of the fuel system?

A

To supply clean fuel to the engine at a sufficient pressure to allow the burning in the combustor.

41
Q

PT6 - power percentage divides on:

A

67% of power to drive compressor 33% of power to drive propeller

42
Q

Engine two major sections:

A
  1. Gas generator section, also call [Gas producer Section] 2. Power Section
43
Q
A

PT6 TURBINES (1 decks)

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