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

 E.
Procedure

 S 432-081
 (1)  
Install the filter:

 (a)  
Install the new O-rings (22 and 24) and the backup rings (21 and 23) on the filter (20) and the filter cap (19). 1) Apply the hydraulic fluid to the O-rings, the backup rings

 and the threads of the fittings.

 (b)  
Install the filter and the cap. 1) Tighten the cap to 60-70 pound-inches(6.78-7.91Nm). 2) Install the lockwire on the cap.

 S 862-083
 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

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

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747-400 MAINTENANCE MANUAL
 S 862-084
 (3)  
Put the FLT CONTROL HYD POWER - WING system 4 switch on the pilots' overhead panel, P5, to the NORM position.

 S 862-085

 (4)  
Do this task to pressurize hydraulic system No. 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).

 S 872-086

 (5)
Extend and retract the spoiler to bleed the hydraulic system.

 S 792-087

 (6)  
Examine the filter cap for leaks.

 F.
Put the Airplane Back to Its Usual Condition

 S 412-088
 (1)  
Close the access panel on the lower surface of the wing.

 S 862-089

 (2)  
Do this task to depressurize hydraulic system No. 4: "Hydraulic Systems Depressurization" (AMM 29-11-00/201).

 S 612-090

 (3)  
Do this task: Hydraulic Reservoir Servicing" (AMM 12-12-01/301).

 S 862-091

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

 S 862-092

 (5)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7G6, SPEED BRAKE AUTO CONT

 TASK 27-61-04-002-093
 6.  Thermal Relief Valve Removal (Fig. 201)____________________________
 A. Standard Tools and Equipment
 (1)  
5/16-18 bolt at least 3 inches long

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 C.
Access

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

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

 D.
Procedure

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747-400 MAINTENANCE MANUAL
 S 862-094
 WARNING:_______ OPEN THE CIRCUIT BREAKERS TO PREVENT THE SPOILER RETRACTION.
 IF YOU USE THE SPEED BRAKE LEVER TO LIFT THE SPOILERS, AND IF
 YOU RELEASE THE 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 862-095
 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).
　
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