GTM Parameters

Question 0

What are the parameters of the GTM compressor?

Answer 0

16 stage, 16:1 axial flow annular type
1 Stage inlet guide vane (IGV)
6 stages variable stator vanes (VSV)

Question 1

Bleed Air Regulating Valves Set point

Answer 1

75 Psig

Question 2

What does 8th stage bleed air provide?

Answer 2

Sump pressurization and cooling

GG balance and piston air

Question 3

What does 9th stage bleed air provide?

Answer 3

Mid frame strut cooling
PT Turbine Fwd Seal Pressurization
PT Balance piston cavity Press

Question 4

What does 13th stage bleed air provide?

Answer 4

Cooling 2nd Stage HP Turbine Nozzles

Question 5

What does 16th stage bleed air Provide?

Answer 5

Cooling 1st stage HP Turbine nozzles
Note: ship service -start , pairie anti-icing, masker. Ngg of 7500 rpms required to produce usable pressure for ships service.

Question 6

Discharge static pressure rated?

Answer 6

250 Pisa max

Question 7

How many stages in the HP turbine?

Answer 7

Two stage

Question 8

How many stages in the gas generator?

Answer 8

16 stages

Question 9

What is the idle speed of the GTM?

Answer 9

5000 rpm +/- 100rpm

Question 10

What is the overspeed alarm point?

Answer 10

9700rpm, if exceeds 10,122 rpms, then the engine must be overhauled

Question 11

Windmilling limits

Answer 11

100 rpms for 2 weeks

>1000 rpms w/ scavenge oil temp <300F

Question 12

GG High vibration alarm set point

Answer 12

4 MILS (NGG >4850)

Question 13

GG high vib trip

Answer 13

7mils, ( NGG >4850)

Question 14

How long can the engine be operated with the PT break engaged?

Answer 14

14 mins @ idle

Question 15

How many stages in the power turbine?

Answer 15

6 stages

Question 16

What is idle speed of the power turbine?

Answer 16

1600-2200 rpms

Question 17

What is the PT speed high alarm set point?

Answer 17

3852 rpms

Question 18

What is the overspeed trip for GTM?

Answer 18

3960 +- 40 rpm ( if 4585 rpms exceeded, PT must be overhauled)

Question 19

When is speed limiting active?

Answer 19

3672 rpm

Question 20

PT high vibes set point?

Answer 20

7 MILS (NGG > 4850)

Question 21

PT High vibe trip point

Answer 21

10 MILS (NGG >4850)

Question 22

Idle T5.4

Answer 22

1000 F

Question 23

Hight T5.4

Answer 23

1600F

Question 24

High T5.4 trip

Answer 24

1625 F

Question 25

What bearing is in A sump?

Answer 25

#3 roller

Question 26

What bearing is in B sump?

Answer 26

4 roller and 4 ball

Question 27

What bearing is in C sump?

Answer 27

5 roller 6 ball

Question 28

What bearing is in D sump?

Answer 28

7 ball 7 roller

Question 29

What type of fuel?

Answer 29

F-76, F-44 in emergencies

Question 30

Fuel pump rating is at?

Answer 30

78 GPM

Question 31

Fuel filter rating?

Answer 31

46-76 microns

Question 32

DP alarm set point for fuel filter

Answer 32

27 psid (7 psi at idle)

Question 33

What is the Bypass valve set point.

Answer 33

30-40 psid

Question 34

How many nozzles are in the LM2500?

Answer 34

30 dual office, swirl atomizer with internal flow divider

Question 35

When does the flow divider open?

Answer 35

Opens at 330 -350 psi

Question 36

What is the flame out trip?

Answer 36

< 400F T5.4 and > 50 Psig FMP

Question 38

What is the idle FMP?

Answer 38

230 - 350 psi. (80-160 psi at ignition)

Question 39

How much fuel does the Purge Valve Use?

Answer 39

Approx 3 GAL

Question 40

Ignition Exciter Voltage

Answer 40

20,000 Volts

Question 41

Start Air Pressure

Answer 41

35-45 PSI

Question 42

Motor Pressure

Answer 42

20-22 PSI

Question 43

Max Temp for starter system

Answer 43

200F

Question 44

Starter CutOut

Answer 44

NGG 4500+/- 200 RPM