(2)  
32-33-08/401, Body Gear Uplock Mechanism

 (3)  
IPC 32-33-08 Fig. 2, IPC 32-33-14 Fig. 2

 B.  
Access

 (1)  
Location Zone
 137 Body Landing Gear Wheel Well, LH
 138 Body Landing Gear Wheel Well, RH

 C.  
Procedure (Fig. 601)

 S 026-002
 (1)  
Remove the uplock actuator from the uplock mechanism (Ref 32-33-08/401).

 S 226-003

 (2)  
Examine these parts for worn areas:

 (a)  
The uplock hook and the roller

 (b)  
The rod end bolt and bushing of the actuator

 (c)  
The head end bolt and bushing of the actuator.

 (3)  
Measure the dimensions shown on figure 601.

 S 226-006
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A

747-400 MAINTENANCE MANUAL
SEE A
ELECTRIC ACTUATOR
SEE B
B
HYDRAULIC
B
UPLOCK
ACTUATOR

A
UPLOCK-OPERATED SEQUENCE
FWD  UPLOCK ASSEMBLY
A A
Body Gear Uplock Mechanism Wear Limits
Figure 601 (Sheet 1)

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747-400
MAINTENANCE MANUAL

ROD END ACTUATOR 
2.53 2.52  1.  UPLOCK ROLLER/ HOOK  ACTUATOR/ BOLT BUSHING 2. CRANK ASSEMBLY 
1  B-B 
HOOK A-A 
HEAD END ACTUATOR 3.  BUSHING/ PIN  ACTUATOR UPLOCK 
HOOK PIVOT PIN 
C-C  FRAME ASSEMBLY  C FWD  C 
1  FOR REPAIR, YOU CAN HARD CHROME PLATE AROUND ROLLER WHERE THE HOOK TOUCHES (0.010 MAX THICK) THE FULL WIDTH ALL THE ROLLER  B 
Body Gear Uplock Mechanism Wear Limits Figure 601 (Sheet 2) 

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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. 3  ANCE MAX CLEAR-DIAM 
MIN  MAX 
1  HOOK  ID  2.520  2.530  2.570  0.080  X  1 
ROLLER  OD  2.490  2.510  2.470  X 
2  BUSHING  ID  0.4370  0.4375  0.4410  0.0040 
BOLT  OD  0.4360  0.4370  0.4335  X 
3  BUSHING  ID  0.4995  0.5000  0.5040  0.0050  X 
PIN  OD  0.4980  0.4990  0.4950  X  X  2 

FOR REPAIR, YOU CAN HARD CHROME PLATE (0.010 MAXIMUM THICK) THE FULL WIDTH ALL AROUND ROLLER WHERE THE HOOK TOUCHES THE ROLLER. SEE OVERHAUL MANUAL SEE OVERHAUL MANUAL THE PART DIMENSION CAN BE MORE THAN THE LIMITS SHOWN BUT NOT MORE THAN THE MAXIMUM CLEARANCE
Body Gear Uplock Mechanism Wear Limits
Figure 601 (Sheet 3)

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747-400 MAINTENANCE MANUAL
　
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