TM 1-1520-238-T-4
Change 5
6–73
6–15.
HOD NGB 1 READING – DISPLAYS 0 LB OIL PRESSURE
6–15
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-23
TM 55-1500-323-24
TM 9-1230-476-20-2
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200 access panel and
LN6, L60 fairings 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
If OIL PSI NOSE GRBX 1 indicator is also
illuminated, troubleshoot Task 6–15.3
before proceeding.
1. Detach P61. Check for open between:
P61–L and P61–M,
P61–L and P61–P,
P61–L and P61–R.
Does open exist?
YES
Go to step 3.
NO
Go to step 2.
2. Check for short between:
P61–L and ground,
P61–M and ground,
P61–P and ground,
P61–R and ground.
Does short exist?
YES
Go to step 3.
NO
Go to step 4.
3. Locate open or short in wire harness between
P61 and MT11.
Can wire harness be repaired?
YES
Repair wiring harness
(TM 55-1500-323-24).
Go to paragraph 6–13.
NO
Replace MT11.
Go to paragraph 6–13.
4. Reconnect P61. Detach P673. Check for open
between:
P673–85 and P673–84,
P673–85 and P673–112,
P673–85 and P673–113.
Does open exist?
YES
Repair open wire between:
P673–85 and J403–B4,
P673–84 and J403–B5,
P673–112 and J403–B15,
P673–113 and J403–B16,
P403–B4 and J61–L,
P403–B5 and J61–M,
P403–B15 and J61–P,
P403–B16 and J61–R.
Go to paragraph 6–13.
NO
Go to step 5.
