TM 1-1520-238-23
2-556.2
Change 2
2.150A. FIREWALL ASSEMBLY NO. 1 OR NO. 2 AFT INBOARD ENGINE MOUNT SUPPORT BEARING
BORE REPAIR
2.150A.1. Description
This task covers:
Repair. Installation.
2.150A.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Airframe repairman’s tool kit (item 377, App H)
Light duty laboratory apron (item 27, App H)
1/2-inch portable pneumatic drill (item 115, App H)
13/16-inch twist drill (item 120A, App H)
Chemical protective gloves (item 154, App H)
Universal puller kit (item 243, App H)
Adjustable hand reamer (item 253A, App H)
Adjustable air filtering respirator (item 262, App H)
Materials/Parts:
Support bushing (figure D-442.2, App D)
Brush (item 34, App F)
Cellophane (item 41, App F)
Sealing compound primer (item 146, App F)
Sealing compound (item 167, App F)
Tape (item 206, App F)
Personnel Required:
67R
Attack Helicopter Repairer
68G
Aircraft Structural Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.150
No. 1 or No. 2 aft engine mount support
bearing removed
2.150A.3. Repair
NOTE
This task is typical for left and/or right aft
engine mount supports.
a. Repair elongated hole.
(1) Drill bearing bore to 0.8125 INCH. Use
pneumatic drill and twist drill.
(2) Ream enlarged bearing bore 0.8295-0.8305
INCH. Use hand reamer.
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M04-5117-5
