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A
747-400
MAINTENANCE MANUAL

NO. INDEX  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  WORN PART REPLACE  PART WORN REPAIR  INSTR. REPAIR 
DIAMETER  PER-MITTED WEAR DIM.4  MAX ANCE CLEAR-DIAM 
MIN  MAX 
1  BEARING  ID  0.3745  0.3750  0.3770  0.0055  1 
BOLT  OD  0.3735  0.3745  0.3715  X 
2  BUSHING  ID  0.6250  0.6265  0.6280  0.0060  X  2 
BOLT  OD  0.6230  0.6240  0.6220  X 
3  BUSHING  ID  0.8750  0.8765  0.8780  0.0065  X  3 
BUSHING  OD  0.8730  0.8740  0.8715  X 

REPLACE THE DOOR ASSEMBLY AND REPAIR THE WORN PART. REFER TO THE OVERHAUL MANUAL FOR THE REPAIR INFORMAITON.
INSTALL THE BUSHING WITH AN INTERFERENCE FIT OF 0.0003 TO 0.0022 INCHES (REF 20-11-01/401). IF IT IS NECESSARY, MAKE THE HOLE A MAXIMUM OF 0.880 INCHES IN DIAMETER.
INSTALL THE BUSHING WITH AN INTERFERENCE FIT OF 0.0004 TO 0.0023 INCHES (REF 20-11-01/401). IF IT IS NECESSARY, MAKE THE HOLE A MAXIMUM OF 1.126 INCHES IN DIAMETER.
THE MEASURED DIMENSION CAN BE MORE THAN THE WEAR DIMENSION IF THE MEASURED CLEARANCE IS NOT MORE THAN THE MAXIMUM CLEARANCE.
Aft Nose Wheel Well Doors Wear Limits
Figure 601 (Sheet 3)

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747-400 MAINTENANCE MANUAL
 NOSE WHEEL WELL FORWARD DOOR OPERATOR RODS - REMOVAL/INSTALLATION
_________________________________________________________________
 1.  General_______
 A. This procedure contains three tasks:
 (1)  
The removal of the operator rods on the forward door of the nose wheel well.

 (2)  
The installation of the operator rods on theforward door of the nose wheel well.

 (3)  
The open and close operation of the release handle on the ground door.

 TASK 32-22-03-004-001
 2.  Nose Wheel Well Forward Door Operator Rods 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

 B.
Access

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

 C.
Prepare for the Procedure

 S 864-028
 (1) Install the ground locks in all landing gear (AMM 09-11-00/201).
 S 864-029
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Do this task: "Installation of the Door Locks on the Nose Landing Gear" (AMM 32-00-30/201).
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747-400
MAINTENANCE MANUAL

SEE A 
FORWARD DOOR 
ACTUATOR 
SEE  C 
BELLCRANK 
FWD 
BELLCRANK 
SUPPORT 
FITTING 
FORWARD DOOR 
OPERATOR ROD 
SEE  B 
SHOWN WITH DOORS OPEN 
A 

OPERATOR ROD
LOCKNUT
DOOR FITTING
DOOR FITTING
ATTACH BOLT
FORWARD
DOOR (LEFT)
B

Nose Wheel Well Forward Door Operator Rods Installation
Figure 401 (Sheet 1)

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