TM 1-1520-238-T-4
6–118
Change 5
6–51.
OIL PSI MAIN XMSN 1 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS NORMAL
6–51
XMN 1 OIL PRESSURE
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
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:
67R
Attack Helicopter Repairer
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 –
L60 fairing and L325,
T250L, T250R,
T290L, T290R 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.
NOTE
Verify transmission system operating
temperature is normal during flight. Low oil
pressure may have resulted from high NGB
1 oil temperature.
1. Detach P18.
Is OIL MAIN XMSN 1 indicator lighted?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot the pilot
caution/warning system.
NO
Go to step 2.
2. Detach P755. Check for short between P18–9
and ground.
Does short exist?
YES
Repair shorted wire between
P18–9 and P755–25. Go to
paragraph 6–13.
NO
Go to step 3.
3. Check for open between:
P18–9 and P456–A7,
P755–26 and ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 6–13.
NO
Go to step 4.
4. Attach P18 and P755. Check for open between
J456–A7 and ground.
Does open exist?
YES
Replace main transmission oil
system 1 oil pressure switch
(TM 1-1520-238-23).
NO
Go to step 5.
