TM 1-1520-238-23
6-426
Change 9
6.97.
MAIN ROTOR SUPPORT MAST REMOVAL/INSTALLATION
6.97.1. Description
This task covers:
Removal. Cleaning. Inspection. Repair. Installation.
6.97.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Aircraft mechanic’s tool kit (item 376, App H)
Electrical tool kit (item 378, App H)
Light duty laboratory apron (item 27, App H)
Fluorescent inspection kit (item 138, App H)
0 - 12-inch micrometer depth gage (item 146, App H)
Chemical protective gloves (item 154, App H)
Sling set kit (item 194, App H)
Ohmmeter (item 218, App H)
Adjustable air filtering respirator (item 262, App H)
Materials/Parts:
Nut (18)
Preload indicating washer (18)
Cloth (item 48, App F)
Cloth (item 51, App F)
Corrosion preventive compound (item 62, App F)
Corrosion preventive compound (item 63, App F)
Cushioning material (item 68, App F)
Dry cleaning solvent (item 74, App F)
Epoxy primer coating kit (item 78, App F)
Isopropyl alcohol (item 106, App F)
Lubricant (item 115A, App F)
Lubricant (item 116, App F)
Primer coating (item 147, App F)
Polyurethane coating (item 141, App F)
Sealing compound (item 177, App F)
Tape (item 206, App F)
Personnel Required:
67R
Attack Helicopter Repairer
68D
Aircraft Powertrain Repairer/NDI
68X
Armament/Electrical System Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 55-1500-323-24
TM 55-1500-335-23
TM 55-1500-344-23
TM 55-1500-345-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
1.98
Crane adjustment - hoisting
6.95
Main rotor gearshaft removed
5.21
Main rotor head removed
11.6
Swashplate removed
WARNING
FLIGHT SAFETY PART
The main rotor support mast 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.
GO TO NEXT PAGE
