TM 1-1520-238-T-4
Change 1
6–111
6–46.
HOD NGB 1 READING – DISPLAYS LOW OIL PRESSURE
6–46
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Personnel Required:
67R
Attack Helicopter Repairer
68X
Armament/Electrical Systems Repairer
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 1 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 1 oil temperature
reading.
Is reading 140 C or higher?
YES
Go to paragraph 6–45 to
troubleshoot HOD NGB 1
display.
NO
Go to step 2.
2. Check pilot caution/warning panel OIL PSI
NOSE GRBX 1 indicator.
Is indicator lighted?
YES
Go to paragraph 6–48 to
troubleshoot NGB 1 OIL PSI
indicator.
NO
Go to step 3.
3. Check pilot caution/warning panel OIL HOT
NOSE GRBX 1 indicator.
Is indicator lighted?
YES
Go to paragraph 6–62 to
troubleshoot OIL HOT NOSE
GRBX 1 indicator.
NO
Go to step 4.
4. Check HOD display for NGB 1 oil pressure
reading.
Is oil pressure 35 LB or higher?
YES
Replace NGB 1 lube pump
(TM 1-1520-238-23).
NO
NGB 1 oil pressure not critically
low. Go to paragraph 6–13.
END OF TASK
