TM 1-1520-238-T-4
6–143
6–68.
HOD XMN 2 READING – DISPLAYS 140 C OR HIGHER OIL TEMPERATURE
6–68
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
68F
Aircraft Electrician
152FG
Maintenance Test Pilot
References:
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 –
T250L, T250R,
T290L, R290R, R295,
L325 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. 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 2.
2. Remove oil 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 3.
NO
Replace main transmission
(TM 1-1520-238-23).
3. Check for 28 VDC between P755–3 and
P755–5.
Is voltage present?
YES
Go to step 4.
NO
Go to step 5.
4. Check for 10 VDC between P682–84 and
P682–85.
Is voltage present?
YES
Refer to TM 9-1230-476-20-2 to
troubleshoot multiplex
subsystem.
NO
Go to step 6.
5. Check for 28 VDC at P755–3.
Is voltage present?
YES
Repair open wire between
P755–5 and GS572–J.
Go to paragraph 6–15.
NO
Refer to chapter 4 to
troubleshoot power plants.
