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EOOW > GTM Parameters > Flashcards

GTM Parameters Flashcards

0
Q

What are the parameters of the GTM compressor?

A

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

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1
Q

Bleed Air Regulating Valves Set point

A

75 Psig

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2
Q

What does 8th stage bleed air provide?

A

Sump pressurization and cooling

GG balance and piston air

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3
Q

What does 9th stage bleed air provide?

A

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

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4
Q

What does 13th stage bleed air provide?

A

Cooling 2nd Stage HP Turbine Nozzles

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5
Q

What does 16th stage bleed air Provide?

A

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.

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6
Q

Discharge static pressure rated?

A

250 Pisa max

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7
Q

How many stages in the HP turbine?

A

Two stage

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8
Q

How many stages in the gas generator?

A

16 stages

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9
Q

What is the idle speed of the GTM?

A

5000 rpm +/- 100rpm

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10
Q

What is the overspeed alarm point?

A

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

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11
Q

Windmilling limits

A

100 rpms for 2 weeks

>1000 rpms w/ scavenge oil temp <300F

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12
Q

GG High vibration alarm set point

A

4 MILS (NGG >4850)

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13
Q

GG high vib trip

A

7mils, ( NGG >4850)

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14
Q

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

A

14 mins @ idle

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15
Q

How many stages in the power turbine?

A

6 stages

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16
Q

What is idle speed of the power turbine?

A

1600-2200 rpms

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17
Q

What is the PT speed high alarm set point?

A

3852 rpms

18
Q

What is the overspeed trip for GTM?

A

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

19
Q

When is speed limiting active?

A

3672 rpm

20
Q

PT high vibes set point?

A

7 MILS (NGG > 4850)

21
Q

PT High vibe trip point

A

10 MILS (NGG >4850)

22
Q

Idle T5.4

A

1000 F

23
Q

Hight T5.4

A

1600F

24
Q

High T5.4 trip

A

1625 F

25
Q

What bearing is in A sump?

A

3 roller

26
Q

What bearing is in B sump?

A

4 roller and 4 ball

27
Q

What bearing is in C sump?

A

5 roller 6 ball

28
Q

What bearing is in D sump?

A

7 ball 7 roller

29
Q

What type of fuel?

A

F-76, F-44 in emergencies

30
Q

Fuel pump rating is at?

A

78 GPM

31
Q

Fuel filter rating?

A

46-76 microns

32
Q

DP alarm set point for fuel filter

A

27 psid (7 psi at idle)

33
Q

What is the Bypass valve set point.

A

30-40 psid

34
Q

How many nozzles are in the LM2500?

A

30 dual office, swirl atomizer with internal flow divider

35
Q

When does the flow divider open?

A

Opens at 330 -350 psi

36
Q

What is the flame out trip?

A

< 400F T5.4 and > 50 Psig FMP

38
Q

What is the idle FMP?

A

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

39
Q

How much fuel does the Purge Valve Use?

A

Approx 3 GAL

40
Q

Ignition Exciter Voltage

A

20,000 Volts

41
Q

Start Air Pressure

A

35-45 PSI

42
Q

Motor Pressure

A

20-22 PSI

43
Q

Max Temp for starter system

A

200F

44
Q

Starter CutOut

A

NGG 4500+/- 200 RPM

EOOW (8 decks)

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