C.
References
(1)
AMM 29-11-00/201, Main Hydraulic Supply System
D.
Access
(1)
Location Zone
575 Spoiler No. 5
675 Spoiler No. 8
E.
Prepare for the Removal
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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 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
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2)
Do this task to pressurize hydraulic systems No. 1 and 4:
"Hydraulic System Pressurization" (AMM 29-11-00/201).
S 864-004
(3)
Put the speed brake control lever in the UP position to lift the spoilers.
S 864-058
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)
Extend the trailing edge flaps.
S 494-006
(5)
Install the spoiler actuator locking tool to keep the control package in the extended position.
S 864-007
(6)
Do this task to depressurize hydraulic systems No. 1 and 4:
"Hydraulic System Depressurization" (AMM 29-11-00/201).
S 494-008
(7)
Install the safety device.
F.
Remove the Spoiler
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747-400
MAINTENANCE MANUAL
SAFTEY HARNESS
RECEPTACLE
SAFTEY HARNESS RECEPTACLE
SEE A
HOIST ATTACHMENT POINT
SLING ASSEMBLY
ADJUSTABLE
SEAL
HINGE NO. 1
INBOARD FLIGHT SEE
B SPOILER
HINGE NO. 2
SEE C SPOILER SLING INSTALLATION
INBOARD FLIGHT
CONTROL PACKAGE SPOILER
PISTON ROD END
SEE E
HINGE NO. 3
HINGE NO. 1
WING
SEE D
SEE BREAR SPAR
BONDING
JUMPER
(2 LOCATIONS)
FWD INBD
EXAMPLE OF FLIGHT NOTE: ON RIGHT WING, HINGE NO. 2 SPOILERS NO. 5 AND 8 IS INBOARD OF HINGE NO. 3
A
Inboard Flight Spoiler Installation
Figure 401 (Sheet 1)
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A
747-400 MAINTENANCE MANUAL
1. SPOILER
15. WASHERS
18.
NUT
19.
WASHER
3. WASHER
14. NUT
20. BUSHING
1.
SPOILER
2.
SEAL PLATE
13. CAPTIVE
3. WASHER BEARING
HINGE BRACKET
17. WASHER
4. BOLT
16. BOLT
12. NUT
6. WASHER
C
5. BUSHING
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