LM2500 GTM

Question 1

What types of engines do we have on board and how many?

Answer 1

4- LM2500 GTM

3- Allison K-34 GTG

Question 2

What drives the reduction gear to turn?

Answer 2

The power turbine drives the output shaft which in turn drives the reduction gear.

Question 3

What is the alarm for GG overspeed?

Answer 3

9700 RPM

Question 4

What is the max GG speed?

Answer 4

10,122 RPM, requires overhaul

Question 5

What is the alarm for PT overspeed?

Answer 5

3852 RPM

Question 6

What is the PT overspeed trip?

Answer 6

3960 RPM

Question 7

What is the max PT speed?

Answer 7

4,585 RPM, requires overhaul

Question 8

What is the high vibes alarm and shutdown on GG?

Answer 8

Alarm: 6mils
Trip: 7mils

Question 9

What is the high TIT alarm and trip on LM2500?

Answer 9

Alarm: 1600* F
Trip: 1625* F

Question 10

What is the max temp the module can withstand?

Answer 10

2000* for 15 minutes

Question 11

What type of oil do we use in the GTM?

Answer 11

23699

Question 12

What is the capacity of the LOSCA?

Answer 12

40 gallons

Question 13

What is the low L/O pressure alarm on the GTM?

Answer 13

15 PSI

Question 14

What is the low L/O pressure trip on the GTM?

Answer 14

6 PSI

Question 15

What is the normal sump level on the LOSCA?

Answer 15

19-24 gallons

Question 16

What is the sump low level alarm on the LOSCA?

Answer 16

9.6 gallons

Question 17

What are the start permissives on receiving start available?

Answer 17

• MRG L/O pressure >13 PSI

- LM2500 GG speed

Question 18

When do we us battle override, and who can authorize it?

Answer 18

RMD, CO

Question 19

What does battle override inhibit?

Answer 19

-Auto Shutdowns
High vibes
Low L/O
High PTIT
-Engine torque limiting
-PT speed limiting
-Fail to idle relay

Question 20

What does battle override not inhibit?

Answer 20

• PT overspeed trip
• Operator initiated stops (Normal/E-STOP)
• Flame out (Fuel manifold pressure >50 PSI, T5.4

Question 21

What is a compressor stall?

Answer 21

A disruption of normal air flow through the GG

Question 22

What are the two types of stalls?

Answer 22

• Steady state (occurs at fixed throttle position, most severe stall).
• Transient state (occurs during a speed change).