TM 1-1520-238-23
5-128
Change 3
5.26.
MAIN ROTOR PITCH HOUSING INSTALLATION
5.26.1. Description
This task covers:
Installation.
5.26.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Electrical tool kit (item 378, App H)
Light duty laboratory apron (item 27, App H)
Chemical protective gloves (item 154, App H)
Heat protective gloves (item 155, App H)
Electric gun type heater (item 163, App H)
Multimeter (item 215, App H)
Adjustable air filtering respirator (item 262, App H)
150 - 750 inch-pound 3/8-inch drive click type torque
wrench (item 442, App H)
0 - 30 inch-pound 1/4-inch drive dial indicator torque
wrench (item 445, App H)
Materials/Parts:
Insulation sleeving (item 99, App F)
Lubricant (item 114, App F)
Sealing compound (item 175, App F)
Strap (item 191, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
One person to assist
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
WARNING
FLIGHT SAFETY PART
The main rotor pitch housing 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
Pitch housings are matched according to weight. Maximum weight should not exceed 26.9 pounds.
Opposite housings must be within 1.5 pounds of each other. Weigh the pitch housing/s and record the
weight/s on DA form 2408-16, in block 6.C below the serial number of the respective pitch housing.
Prior to installation, match marks on pitch housings to facilitate proper installation, i.e., 1 opposite 3
and 2 opposite 4, or A opposite C and B opposite D.
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