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K18904
A
747-400
MAINTENANCE MANUAL
A
A
B
B DSEE UPLOCK HOOK
14. WASHER 13. WASHER 14. WASHER
18. BOLT 15. COTTER PIN LINK ASSEMBLY 16. NUT
ASSEMBLY SPRING 21. WASHER 20. NUT 19. COTTER PIN 22. BOLT
17. HOOK ASSEMBLY 23. WASHER
A-A 17. HOOK ASSEMBLY B-B
Wing Landing Gear Uplock Hook Installation Figure 401 (Sheet 2)
K19254
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A
747-400
MAINTENANCE MANUAL
C
C
UPLOCK HOOK D
FRAME ASSEMBLY
6. HOOK PIVOT PIN
24.
COTTER PIN
25.
NUT
26.
WASHER
17. HOOK ASSEMBLY
C-C
Wing Landing Gear Uplock Hook Installation
Figure 401 (Sheet 3)
K19282
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747-400
MAINTENANCE MANUAL
RUBBER SLEEVE
(1/2 INCH ID X 1/8 INCH THICK)
_______DO NOT USE THIS TOOL IF THE RUBBER SLEEVE IS DAMAGED.
CAUTION: EXAMINE THE SLEEVE FOR DAMAGE BEFORE AND AFTER USE. INSTALL A NEW SLEEVE IF IT IS DAMAGED. THE TOOL CAN CAUSE DAMAGE TO THE UPLOCK MECHANISM.
ACTUATING TOOL
LOCK OPEN (PREFERRED METHOD)
LOCK CLOSED
Wing Landing Gear Uplock Hook Tool Installation
Figure 402
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K18938
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747-400 MAINTENANCE MANUAL
C. Parts
~...................................................................... | QUANTITY | NAME | AIPC # |ITEM #| ........................................................................ | 1 |Hook | 350 | 17 | ........................................................................ | 1 |Cotter Pin (CP) - Link | 171 | 19 | ........................................................................ | 1 |CP - Spring | 158 | 15 | ........................................................................ | 1 |CP - Pin | 325 | 24 | ........................................................................ | 1 |CP - Actuator Pin End | 205 | 2 | ........................................................................ | 1 |CP - Actuator Link End | 182 | 8 | 2...........….......................................…...........…......1
D. Access
(1)
Location Zone
755 Body Landing Gear, LH
765 Body Landing Gear, RH
E.
Install the Uplock Hook.
S 644-053
(1)
Apply a thin layer of BMS 3-27 corrosion preventive compound to the threads of pivot pin (6).
S 424-054
(2)
Align hook (17) with assembly. Install pivot pin (6) with head toward hydraulic actuator. Install washer (26) and nut (25), tighten nut to 100 lb-in (0.11 N-m). Loosen nut if necessary to install cotter pin (24). View C-C.
S 644-055
(3)
Apply a thin layer of grease to faying surfaces of link and hook (17).
S 424-056
(4)
Align hook (17) and link. Install bolt (22) with washer (23) under head. Install washer (21) and nut (20). Torque to 100 lb-in (0.11 N-m). Loosen as needed to install cotter pin (19). View B-B.
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