TM 1-1520-238-23
5-222.2
Change 8
1.6.
MAIN ROTOR LOWER SHOE SCISSOR ATTACH SLEEVE BEARINGS REPLACEMENT
5.49A.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
5.49A.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Light duty laboratory apron (item 27, App H)
0.000 - 0.100-inch outside micrometer caliper (item 51,
App H)
0.3700 - 0.6300-inch cylinder gage (item 141, App H)
Heat protective gloves (item 155, App H)
Bearing removal/installation tool (item 257A, App H)
Materials/Parts:
Brush (item 34, App F)
Carbon dioxide (item 40, App F)
Cloth (item 49, App F)
Cloth (item 52, App F)
Dry cleaning solvent (item 74, App F)
Sealing compound (item 176, App F)
Corrosion preventive compound (item 62A, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
11.16
Load bearing main rotor scissor removed
or
11.18
Secondary main rotor scissor removed
WARNING
FLIGHT SAFETY PART
The main rotor lower shoe is a flight safety part. Failure to follow maintenance instructions
may result in serious injury or death of crewmembers and/or serious damage to the
helicopter.
Heat treat is a flight safety part critical characteristic of the main rotor lower shoe. Do not
apply heat to the main rotor lower shoe to aid removal and/or installation of the main rotor
lower shoe scissor attach sleeve bearing.
CAUTION
To prevent damage to the lower shoe and/or sleeve bearing, the ram load in pounds shall not exceed
500 times the OD of the bearing measured in inches.
NOTE
This task is typical for all main rotor lower shoe scissor attach sleeve bearings.
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