TM 1-1520-238-23
Change 4
6-97
SECTION II. ENGINE NOSE GEARBOX MAINTENANCE
6.17.
ENGINE NOSE GEARBOX INSPECTION
6.17.1. Description
This task covers:
Inspection.
6.17.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
Fluorescent inspection kit (item 138, App H)
0.000 - 0.125-inch dial indicator depth gage (item 145,
App H)
Chemical protective gloves (item 154, App H)
Adjustable air filtering respirator (item 262, App H)
Materials/Parts:
Brush (item 34, App F)
Methyl ethyl ketone (item 124, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
TM 55-1500-335-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
6.17.3. Inspection
a. Check components for damage and loose mounting.
b. Check for loose, missing, or damaged mounting hardware.
c. Check differential pressure indicator.
(1) If indicator button is extended, perform drive system dynamic maintenance operational check
(TM 1-1520-238-T).
d. Check lube oil leakage from gearbox housing or lube oil pump.
(1) Remove gearbox shroud for access (para 2.123).
(2) Replace seal if leakage rate exceeds one drop per minute (para 6.37 and 6.38).
GO TO NEXT PAGE
