TM 1-1520-238-T-4
Change 5
6–161
6–80.
NGB OIL LOSS IS INDICATED
6–80
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Personnel Required:
67R
Attack Helicopter Repairer
References:
TM 1-1520-238-23
1. Visually inspect area around NGB expansion
plugs for leakage.
Is leakage present?
YES
Replace gearbox
(TM 1-1520-238-23).
NO
Go to step 2.
2. Inspect NGB for visible damage.
Is damage present?
YES
Replace NGB
(TM 1-1520-238-23).
NO
Go to step 3.
3. Visually inspect for oil being forced out NGB
breather.
Is oil leakage present at breather?
YES
Replace NGB filler plug packing
(TM 1-1520-238-23).
NO
Go to step 4.
4. Visually inspect area around NGB seals and
packing for leakage.
Is leakage present?
YES
Replace seal or packing
(TM 1-1520-238-23).
NO
Refer to special inspection
number 26 (NGB oil loss)
(TM 1-1520-238-23).
END OF TASK
