TM 1-1520-238-T-4
6–148
Change 1
6–71.
OIL HOT MAIN XMSN 2 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS HIGH XMN
6–71
2 OIL TEMPERATURE
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Tool Kit, Powertrain
SC518099CLA013
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
68X
Armament/Electrical Systems Repairer
152FG
Maintenance Test Pilot
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
TM 1-1520-238-CL
Equipment Conditions:
Ref
Condition
TM 1-1520-238-CL
Engine 2 operating
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. Check HOD display for XMN 2 oil pressure
reading.
Is oil reading 28 LB or lower?
YES
Go to paragraph 6–70 to
troubleshoot OIL HOT MAIN
XMSN 2 indicator.
NO
Go to step 2.
2. Check pilot caution/warning panel OIL PSI MAIN
XMSN 2 indicator.
Is indicator lighted?
YES
Go to paragraph 6–68 to
troubleshoot HOD XMN 2
display.
NO
Go to step 3.
3. Check HOD display for XMN 2 oil temperature
reading.
Is oil temperature 121 C or higher?
YES
Go to step 5.
NO
Go to step 4.
4. Check for short between J755–17 and J755–19.
Does short exist?
YES
Replace main transmission oil
system 2 chip detector
(TM 1-1520-238-23).
NO
Go to step 6.
5. Check heat exchanger 2 for obstruction and
damage (TM 1-1520-238-23).
Is there obstruction or damage?
YES
Remove obstruction or replace
main transmission 2 heat
exchanger if it has damage
(TM 1-1520-238-23).
NO
Replace main transmission 2
primary lube pump
(TM 1-1520-238-23).
6. Check for short between P755–17 and P18–66.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 6–13.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot the pilot
caution/warning system.
END OF TASK
