TM 1-1520-238-T-4
6–126
Change 1
6–56.
OIL PSI MAIN XMSN 2 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS LOW XMN 2
6–56
OIL PRESSURE
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Tool Kit, Powertrain
SC518099CLA013
Repairer’s
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
68X
Armament/Electrical Systems Repairer
152FG
Maintenance Test Pilot
References:
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 temperature
reading.
Is oil temperature 121 C or higher?
YES
Replace main transmission 2
primary lube pump
(TM 1-1520-238-23).
NO
Go to step 2.
2. Check pilot caution/warning panel OIL HOT
MAIN XMSN 2 indicator.
Is indicator lighted?
YES
Go to paragraph 6–53 to
troubleshoot HOD XMN2
display.
NO
Go to step 3.
3. Check HOD display for XMN 2 oil pressure.
Is reading 35 LB or lower?
YES
Go to step 4.
NO
Go to paragraph 6–55 to
troubleshoot OIL PSI MAIN
XMSN 2 indicator.
4. Check HOD display for XMN 2 oil pressure
reading.
Is reading 28 LB or lower?
YES
Replace main transmission
(TM 1-1520-238-23).
NO
Go to step 5.
5. Visually inspect oil system 2 for low oil level and
physical damage (TM 1-1520-238-23).
Is damage present?
YES
Replace main transmission
(TM 1-1520-238-23).
NO
Go to step 6.
6. Replace main transmission primary lube pump
(TM 1-1520-238-23).
Is HOD display still 28 LB or lower?
YES
Replace main transmission 2
float diverter valve
(TM 1-1520-238-23).
NO
Go to paragraph 6–13.
END OF TASK
