TM 1-1520-238-23
Change 7
5-256.1
5.57A.
TAIL ROTOR HUB ASSEMBLY REMOVAL/INSTALLATION (AVIM)
5.57A.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
5.57A.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Light duty laboratory apron (item 27, App H)
2 - 12-inch inside micrometer caliper (item 56, App H)
16-inch x 3/4-inch drive socket wrench extension
(item 122, App H)
Tail rotor fixture (item 136, App H)
0 - 18-inch height gage (item 149, App H)
Chemical protective gloves (item 154, App H)
9-inch x 1/2-inch drive hinged socket wrench handle
(item 171, App H)
0.0015 - 0.0250-inch thickness gage (item 152, App H)
15-inch master precision level (item 202, App H)
Adjustable air filtering respirator (item 262, App H)
11/16 x 1/2-inch drive socket wrench socket (item 304,
App H)
13/16 x 1/2-inch drive socket wrench socket (item 311,
App H)
Tail rotor strap pack centering tool kit (item 374, App H)
V-block (item 401, App H)
100 - 500 foot-pound 3/4-inch drive click type torque
wrench (item 438, App H)
0 - 75 inch-pound 1/4-inch drive dial indicator torque
wrench (item 446, App H)
Materials/Parts:
Spare bolt (2)
Nut (2)
Spacer (as required)
Brush (item 34, App F)
Corrosion preventive compound (item 62, App F)
Lubricant (item 114, App F)
Wax pencil (item 137, App F)
Sealing compound primer (item 146, App F)
Sealing compound (item 156A, App F)
Sealing compound (item 168, App F)
Tape (item 203, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 55-1500-344-23
Equipment Conditions:
Ref
Condition
5.60
Tail rotor head removed
WARNING
FLIGHT SAFETY PART
The tail rotor hub 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.
NOTE
This task applies to upper and lower tail rotor hubs.
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