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A
747-400 MAINTENANCE MANUAL
S 864-002
WARNING:_______OPEN THE CIRCUIT BREAKER TO PREVENT THE SPOILER RETRACTION. IF YOU USE THE SPEED BRAKE LEVER TO LIFT THE SPOILERS, AND IF YOU RELEASE PRESSURE IN HYDRAULIC SYSTEMS NO. 1 AND 4, THE SPOILERS WILL AUTOMATICALLY RETRACT. THIS CAN CAUSE INJURY TO PERSONS.
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7G6, SPEED BRAKE AUTO CONT
S 864-003
(2)
Do this task to pressurize hydraulic systems No. 1 and No. 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).
S 864-004
(3)
Put the speed brake lever in the UP position to lift the spoilers.
S 864-046
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
(4)
Put the flap control lever in the 30-unit detent to extend the trailing edge flaps.
S 494-006
(5)
Install the spoiler locking tool to keep the spoiler actuator in the extended position.
S 864-007
(6)
Do this task to depressurize hydraulic systems No. 1 and No. 4: "Hydraulic System Depressurization" (AMM 29-11-00/201).
S 494-008
(7)
Attach the safety device to the top surface of the wing, forward of the spoiler hinge line.
F.
Remove the Spoiler
S 494-009
(1)
Attach the sling assembly, the load positioner, and a hoist to the spoiler (Fig. 401).
(a)
Balance the load positioner for 90 pounds.
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747-400
MAINTENANCE MANUAL
SEE A
SPOILER GROUND POINT ATTACHMENT HOIST ASSEMBLY SLING
SEAL ADJUSTABLE
BSEE HINGE NO. 1 CSEE HINGE NO. 2 DSEE HINGE NO. 3 SPOILER GROUND
BONDING JUMPER (2 LOCATIONS)
BSEE HINGE NO. 1
EDGE BEAM TRAILING
ESEE CONTROL PACKAGE PISTON ROD END
____NOTE: ON RIGHT WING, HINGE NO. 2 IS INBOARD OF HINGE NO. 3 SPOILERS NO. 6 AND 7 EXAMPLE OF GROUND A
Figure 401 (Sheet 1) Ground Spoiler Installation
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747-400 MAINTENANCE MANUAL
1
15. WASHER
1. SPOILER
3. WASHER
14. NUT 20. BUSHING
1. SPOILER
18. NUT
2. SEAL PLATE
13. CAPTIVE
3. WASHER
BEARING
19. WASHER
4. BOLT
12. NUT
17. WASHER
6. WASHER
HINGE
16. BOLT BRACKET 5. BUSHING
5.
BUSHING
6.
WASHER
HINGE NO. 2
7. BOLTHINGE
BRACKET
C
8.
BOLT
9.
WASHER
11. BONDING 10. NUTJUMPER
HINGE NO. 1
1. SPOILER
B
1. SPOILER 28. WASHER
18.
NUT
19.
WASHER
35. BOLT
34. WASHER
33. NUT
20. BUSHING 27. ANTIROTATION
20. BUSHING PLATE21. ANTIROTATION
WASHER
31. BUSHING 28. WASHER
22. BOLT
29. NUT
26. BOLT 25. SPACER 31. BUSHING
24. WASHER 23. NUT
30. BOLT (PISTON ROD END) 32. CONTROL PACKAGE
HINGE NO. 3
D E
1
INSTALL 1 TO 6 WASHERS AS NECESSARY
Ground Spoiler Installation
Figure 401 (Sheet 2)
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