LM2500 Stops and Sutdowns Flashcards
1
Q
What is the Normal Stop Sequence
A
- SCU drives DFC to idle, Normal stop then initiated.
- UEC starts 5 Min timer.
- At end of 5 min, FSOVs close, start 90 sec timer
- Off light will illuminate when Ngg is less then 3500 RPM and FMP has decreased below 50 PSIG.
- If T5.4 has not decreased below 400F or FMP has not decreased below 50 PSIG within 90 sec, “NORMAL STOP FAILURE” Displayed, primary indication of Post-Shutdown Fire.
- PT Brake will apply whn PT speed is below 500 RPM and FMP is less than 50 PSIG
- If outside air temp is less than 50, cooling fan will stop, otherwise it will run for 10 min then secure.
- If outside air temp is above 70F, damper will remain open. If between 70 and 125F operate fan for minimum of 10 mins. If above 125 Vent dampner fan auto run.
2
Q
What is an emergency stop?
A
- UEC will close FSOV
- PT Brake applied when PT SPEED is below 500 RPM
- Cooling fan stops/vent damper closes.
3
Q
What is a fire stop?
A
- E-Stop the engine, then Halon is released.
4
Q
PT Inlet Gas Temp High Shutdown
A
T5.4 is 1625F
5
Q
GG Overspeed Shutdown
A
9700 RPM
6
Q
PT Overspeed Shutdown:
A
Npt is 3960 RPM
7
Q
G/T lube oil supply pressure low shutdown
A
6 psig
8
Q
What is a Stall?
A
When the negative rate of change of compressor static discharge presure is great the High shutdown setpoint for 30 Msec.
9
Q
GG Vib High
A
4 mils
10
Q
GG Vib trip
A
7 Mils
11
Q
PT Vib High
A
7 Mils
12
Q
PT High trip
A
10 Mils
13
Q
PT inlet High alarm
A
1600 F
14
Q
Max PT Inlet temp during start
A
1350F
15
Q
Max PT Inlet temp at idle
A
1000F
