(4)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 864-003
 S 864-006
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MAINTENANCE MANUAL

 S 864-007
 (5)  
Put the FLT CONTROL HYD POWER - WING system 4 switch on the P5 panel to the SHUTOFF position.

 S 864-008

 (6)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180 DC Power Distribution Panel
 1) 180E22 LATERAL CONT VLV SYS 4

 S 014-009
 (7)  
Open the access panel 572FB on the left wing or 672FB on the right wing below the inboard spoiler actuator.

 D.
Remove the Ratio Changer Actuator

 S 034-010
 (1)
Disconnect the hydraulic lines from the actuator (Fig. 401).

 (a)  
Install the caps on the hydraulic lines and the actuator ports.

 S 024-012
 (2)  
Remove the ratio changer actuator:

 (a)  
Disconnect the piston rod of the actuator from the ratio changer linkage.

 (b)  
Remove the bolt that attaches the actuator to the quadrant mounting bracket.

 (c)  
Remove the ratio changer actuator.

 TASK 27-61-13-404-014
 3. Ratio Changer Actuator Installation (Fig. 401)
___________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-61-13/601, Inboard Flight Spoiler Ratio Changer Actuator

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 B.
Access

 (1)  
Location Zone
 575 Spoiler No. 5
 675 Spoiler No. 8

 (2)  
Access Doors
 572FB Access Panel - Trailing Edge Lower, LH
 672FB Access Panel - Trailing Edge Lower, RH

 C.
Procedure

 S 224-028
 (1)  Do this task: "Ratio Changer Actuator Inspection"
 (AMM 27-61-13/601).

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747-400 MAINTENANCE MANUAL
SEE A
SPOILER HINGE
SPOILER CONTROL PACKAGE
SEE B
QUADRANT
RATIO CHANGER
INBD FWD LINKAGE
QUADRANTRATIO MOUNTING
CHANGER BRACKET
ACTUATOR
INBOARD FLIGHT SPOILER NO. 8 RATIO CHANGER ACTUATOR SHOWN SPOILER NO. 5 EQUIVALENT
A
Inboard Flight Spoiler Ratio Changer Actuator Installation Figure 401 (Sheet 1)
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 S 424-027
 (2)  
Install the ratio changer actuator:

 (a)  
Attach the actuator to the quadrant mounting bracket with a bolt, a washer and a nut.

 (b)  
Install the cotter pin in the nut.

 (c)  
Attach the piston rod end of the actuator to the ratio changer linkage with a bolt, a washer, and a nut.

 (d)  
Install the cotter pin in the nut.

 S 434-018
 (3)  
Connect the hydraulic lines to the actuator:

 (a)  
Remove the caps from the hydraulic lines and the actuator ports.

 (b)  
Connect the hydraulic lines to the actuator.

 D.
　
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