TM 1-1520-238-T-4
6–127
6–57.
HOD NGB 2 READING – DISPLAYS 28 LB OR LESS OIL PRESSURE
6–57
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 –
R200 access panel
and RN6, R60
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.
1. Visually inspect NGB 2 for low oil level and
damage (TM 1-1520-238-23).
Is damage present?
YES
Replace NGB 2
(TM 1-1520-238-23).
NO
Go to step 2.
2. Remove NGB 2 oil pressure transducer
(TM 1-1520-238-23). Install pressure gage. Start
engine 2 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 NGB 2
(TM 1-1520-238-23).
3. Check for open between:
P672–85 and P673–84,
P672–85 and P673–99,
P672–85 and P673–100.
Does open exist?
YES
Go to step 4.
NO
Go to step 5.
4. Check for open between:
P60–L and P60–M,
P60–L and P60–P,
P60–L and P60–R.
Does open exist?
YES
Replace NGB 2 oil pressure
transducer (TM 1-1520-238-23).
NO
Repair open wire between:
J60–L and P672–85,
J60–M and P672–84,
J60–P and P672–99,
J60–R and P672–100.
Go to paragraph 6–13.
5. Detach P672. Check for short between:
J60–L and P60–M,
J60–P and P60–R.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 6–13.
NO
Go to step 6.
