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LENGTH OF PIN
WORN PART REPAIRABLE. CHROME PLATE TO 0.007 THICKNESS AND GRIND TO DESIGN
DIMENSIONS GAP BETWEEN FLANGES OF BUSHINGS IN BELLCRANK WIDTH OVER BEARING IN ACTUATOR ROD END GAP BETWEEN FLANGES OF END CAPS. THE MAXIMUM DESIGN ALLOWABLE IS PIN LENGTH
PLUS POSSIBLE 1/6-TURN BACKOFF OF NUT WIDTH OVER OUTER FLANGES OF BUSHINGS IN BELLCRANK CHANGE WORN PARTS OR SHIM UNDER FLANGES OF BUSHINGS (0.015 MAXIMUM EACH)
NOTE:MINIMUM GAP OF 0.004 MUST BE RETAINED LIMITS SHOWN MAY BE EXCEEDED PROVIDED MAXIMUM CLEARANCE IS NOT EXCEEDED WORN PART IS REPAIRABLE. REFER TO OVERHAUL MANUAL FOR REPAIR INFORMATION.
Wing Gear Truck Positioning Actuator Wear Limits
Figure 601 (Sheet 3)

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A
747-400 MAINTENANCE MANUAL
 WING GEAR BELLCRANK ASSEMBLY POSITIONING MECHANISM - REMOVAL/INSTALLATION
_________________________________________________________________________
 1.  General_______
 A.  This procedure has two tasks:
 (1)  
The removal of the bellcrank mechanism.

 (2)  
The installation of the bellcrank mechanism.

 B.  
The bellcrank mechanism is connected to the rod end of the truck positioning actuator, the truck positioning link, and the torsion link apex. The removal and installation procedures for the two bellcranks are the same.

 TASK 32-11-21-004-001
 2.  Bellcrank Mechanism Removal (Fig. 401)__________________________
 A.  References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
AIPC 32-11-21 Fig. 1

 (5)  
AIPC 32-11-22 Fig. 1

 B.  
Access

 (1)  
Location Zone
 735 Wing Landing Gear, LH
 745 Wing Landing Gear, RH

 C.  
Procedure

 S 224-035
 CAUTION: MAKE SURE THAT YOU DO NOT MOVE OR DAMAGE THE WING GEAR TRUCK
_______ SENSORS OR TARGET BRACKET. IF THE TARGET BRACKET OR SENSORS ARE MOVED, THEN THE AIRPLANE SYSTEMS MAY NOT RECOGNIZE AN IN-AIR CONDITION.
 (1)  If the sensor or target bracket is moved or damaged, then do the task to measure the wing landing gear truck sensor clearance (AMM 32-61-22/201).
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747-400 MAINTENANCE MANUAL
SEE B
SEE A SEE C
1.  
POSITIONING ACTUATOR

2.  
NYLON SPACERS

4.  END CAP
3.  PIN 5. BOLT
UPPER TORSION LINK
COTTER PIN
12.  BELLCRANK
16.  CONDUIT BRACKET
11.  BOLT
APEX
LOWER TORSION LINK
10. PIN
9.  END CAP
FWD
8.  TRUCK
POSITIONING LINK

A
Bellcrank Assembly Installation Figure 401 (Sheet 1)
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747-400
MAINTENANCE MANUAL

UPPER CONDUIT

BRACKET
Bellcrank Assembly Installation
Figure 401 (Sheet 2)

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