TM 1-1520-238-T-4
6–140
Change 1
6–66.
OIL HOT MAIN XMSN 1 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS NORMAL
6–66
XMN 1 OIL TEMPERATURE
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Tool Kit, Powertrain
SC518099CLA013
Repairer’s
Adapter, Straight Pipe
A1100-4-4
to Tube, Female
Pipe End, 37 Flared
Gage Pressure, Dial
GGG76
Indicating
(0-200 PSI)
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
TM 9-1230-476-20-2
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200, L325, R290R, R295,
T250L, T250R, T290L and
T325
access doors open
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 XMN 1 oil pressure reading.
Is reading 28 LB or lower?
YES
Go to step 3.
NO
Go to step 2.
2. Check for short between J755–29 and J755–27.
Does short exist?
YES
Replace main transmission oil
system 1 chip detector
(TM 1-1520-238-23).
NO
Go to step 4.
3. Visually inspect oil system 1 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 5.
4. Check for short between P755–29 and P18–65.
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.
5. Remove engine system 1 heat exchanger
pressure transducer (TM 1-1520-238-23). Install
pressure gage. Start engine 1 and place PWR
lever to FLY (TM 1-1520-238-CL). Operate until
readings stabilize.
Is oil pressure above 28 LB on pressure
gage?
YES
Go to step 6.
NO
Replace main transmission
(TM 1-1520-238-23).
6. Check for 28 VDC between P755–2 and
P755–6.
Is voltage present?
YES
Go to step 7.
NO
Go to step 8.
