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SPACER  OD  0.870  0.873  0.8680  X 
22 AND 18  BUSHING  ID  0.7500  0.7515  0.7530  0.0060  X  *[7] 
BUSHING  OD  0.7480  0.7490  0.7470  X 
23 AND 19  BUSHING  ID  0.5000  0.5015  0.5030  0.0055  X  *[3] 
BOLT  OD  0.4985  0.4995  0.4975  X 
24  BUSHING  ID  0.7727  0.7850  0.785  0.041  X 
BOLT  OD  0.7440  0.7490  0.744  X  *[6] 

Nose Wheel Well Aft Door Operator Wear Limits
Figure 601 (Sheet 5)

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A
747-400
MAINTENANCE MANUAL

INDEX NO.  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  REPLACE PART WORN  REPAIR WORN PART  REPAIR INSTR. 
DIAMETER  WEAR ALLOWED DIM. *[11]  DIAM CLEAR-ANCE MAX 
MIN  MAX 
25  BOLT  *[8]  5.720  5.740  5.740  *[10] 0.001  X  *[6] 
BUSHING  *[9]  5.745  5.750  5.741  X  *[6] 
26  BUSHING  ID  1.0000  1.0010  1.0030  0.0055  X  *[6] 
BOLT  OD  0.9975  0.9990  0.9955  X  *[6] 

*[1] INSTALL BUSHING PER 20-11-01 WITH INTERFERENCE FIT OF 0.0003 TO 0.0022 INCH. MAXIMUM OVERSIZE HOLE IN FITTING IS 0.880 INCH, IF REQUIRED. *[2] INSTALL BUSHING PER 20-11-01 WITH INTERFERENCE FIT OF 0.0004 TO 0.0023 INCH. MAXIMUM OVERSIZE HOLE IN FITTING IS 1.126 INCH, IF REQUIRED. *[3] INSTALL BUSHING PER 20-11-01 WITH INTERFERENCE FIT OF 0.0003 TO 0.0018 INCH. MAXIMUM OVERSIZE BUSHING AND HOLE IN FITTING IS 0.767 INCH, IF REQUIRED. *[4] INSTALL BUSHING PER 20-11-01 WITH INTERFERENCE FIT OF 0.0003 TO 0.0022 INCH. MAXIMUM OVERSIZE BUSHING AND HOLE IN FITTING IS 0.940 INCH, IF REQUIRED. *[5] INSTALL BUSHING PER 20-11-01 WITH INTERFERENCE FIT OF 0.0004 TO 0.0023 INCH. MAXIMUM OVERSIZE HOLE IN FITTING IS 0.9679 INCHES, IF REQUIRED. *[6] WORN PART IS REPAIRABLE. REFER TO OVERHAUL MANUAL FOR REPAIR INFORMATION. *[7] INSTALL BUSHING PER 20-11-01 WITH INTERFERENCE FIT OF 0.0004 TO 0.0023 INCH. MAXIMUM OVERSIZE BUSHING AND HOLE IN FITTING IS 1.000 INCH, IF REQUIRED. *[8] LENGTH OF BOLT SHOULDER TO SHOULDER ON 1-INCH DIAMETER. *[9] WIDTH OVER FLANGES OF BUSHINGS IN OUTER CYLINDER. *[10] ONE-INCH DIAMETER PORTION OF BOLT MUST NOT PROTRUDE FROM BUSHING WHEN SEATED. *[11] LIMITS SHOWN MAY BE EXCEEDED PROVIDED MAXIMUM CLEARANCE IS NOT EXCEEDED.
Nose Wheel Well Aft Door Operator Wear Limits
Figure 601 (Sheet 6)

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747-400 MAINTENANCE MANUAL
 NOSE WHEEL WELL FORWARD DOOR BELLCRANK - REMOVAL/INSTALLATION
_____________________________________________________________
 1.  General
_______
 A.  The bellcrank is connected to the bellcrank support fitting at the forward end of the wheel well.
 B.  Use the wrench to remove the bellcrank with the mechanical steps.
 C.  The installation of the bellcrank has more steps to make sure you adjust the rods correctly.
 TASK 32-22-05-004-001
 2.  Forward Door Bellcrank Removal (Fig. 401)
______________________________
 A.  References
 (1)  
AMM 09-11-00/201, Towing

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

 (3)  
AIPC 32-22-03 Fig. 2

 (4)  
AIPC 32-22-05 Fig. 1

 B.  
Access

 (1)  
Location Zone
 711 Nose Landing Gear Door, Forward, LH
 712 Nose Landing Gear Door, Forward, RH

 C.  
Procedure

 S 864-031
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
　
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