TM 1-1520-238-T-4
6–132
Change 1
6–60.
OIL PSI NOSE GRBX 2 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS LOW NGB 2
6–60
OIL PRESSURE
Tools:
Nomenclature
Part Number
Tool Kit, Powertrain
SC518099CLA013
Repairer’s
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
152FG
Maintenance Test Pilot
References:
TM 1-1520-238-23
TM 1-1520-238-CL
Equipment Conditions:
Ref
Condition
TM 1-1520-238-CL
Engine 2 operating
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 for NGB 2 oil temperature
reading.
Is oil temperature 121 C or higher?
YES
Replace NGB 2 lube pump
(TM 1-1520-238-23).
NO
Go to step 2.
2. Check pilot caution/warning panel OIL HOT
NOSE GRBX 2 indicator.
Is indicator lighted?
YES
Go to paragraph 6–57 to
troubleshoot HOD NGB 2
display.
NO
Go to step 3.
3. Check HOD display for NGB 1 oil pressure
reading.
Is reading 35 LB or lower?
YES
Go to step 4.
NO
Go to paragraph 6–59 to
troubleshoot OIL PSI NOSE
GRBX 2 indicator.
4. Check HOD display for NGB 2 oil pressure
reading.
Is reading 28 LB or lower?
YES
Replace NGB 2
(TM 1-1520-238-23).
NO
Go to step 5.
5. 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
Replace NGB 2 lube pump
(TM 1-1520-238-23).
END OF TASK
