TM 1-1520-238-23
Change 4
6-433
6.98.
MAIN ROTOR MAST SUPPORT BASE SPACER PLATE REMOVAL/INSTALLATION
6.98.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.98.2. 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)
0.000 - 0.125-inch dial indicator depth gage (item 145,
App H)
Chemical protective gloves (item 154, App H)
1 1/4-inch blade putty knife (item 199, App H)
Ohmmeter (item 218, App H)
Adjustable air filtering respirator (item 262, App H)
Materials/Parts:
Cloth (item 52, App F)
Corrosion resistant coating (item 66, App F)
Methyl ethyl ketone (item 124, App F)
Sealing compound (item 176, 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
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
6.97
Rotor support mast removed
WARNING
FLIGHT SAFETY PART
The main rotor mast support base 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.
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