(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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A
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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