TM 1-1520-238-T-4
6–152
Change 1
6–74.
OIL HOT NOSE GRBX 2 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS NORMAL
6–74
NGB 2 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 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.
1. Check HOD display NGB 2 oil pressure reading.
Is reading 28 LB or lower?
YES
Go to step 3.
NO
Go to step 2.
2. Detach P18.
Does indicator remain lighted?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot the pilot
caution/warning system.
NO
Go to step 4.
3. 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 5.
4. Check for short between J60–A and P18–53.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 6–13.
NO
Replace NGB 2 metallic chip
detector (TM 1-1520-238-23).
5. 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 6.
NO
Replace NGB 2
(TM 1-1520-238-23).
6. Check for 28 VDC between J60–F and J60–G.
Is voltage present?
YES
Go to step 7.
NO
Go to step 9.
