(a)
P7, Overhead Circuit Breaker Panel
(b)
7G6, SPEED BRAKE AUTO CONT
S 862-064
(2) Do this task to pressurize hydraulic systems No. 1 and 4:
"Hydraulic System Pressurization" (AMM 29-11-00/201).
S 862-093
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.
(3)
Put the flap control lever in the 30-unit detent to extend the flaps.
S 862-066
(4)
Put the speed brake lever in the UP position.
S 492-067
(5)
Install the spoiler actuator locking tool.
S 862-068
(6)
Do this task to depressurize hydraulic systems No. 1 and 4:
"Hydraulic System Depressurization" (AMM 29-11-00/201)
(7)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 862-070
(8)
Put the FLT CONTROL HYD POWER - WING system 4 switch on the pilots' overhead panel, P5, to the SHUTOFF position.
S 862-069
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747-400 MAINTENANCE MANUAL
S 862-071
(9)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P180, DC Power Distribution Panel
1) 180E22, LATERAL CONT VLV SYS 4
S 012-072
(10)
Open the wing access panel below spoiler control package (572CB, left wing; 672CB, right wing).
S 022-073
(11)
Remove the thermal relief valve:
(a)
Put a container below the spoiler control package to catch the hydraulic fluid.
(b)
Use a 5/8-18 bolt to remove the thermal relief valve cap (22) and valve (17).
TASK 27-62-05-402-074
5. Thermal Relief Valve Installation (Fig. 201)
_________________________________
A. Standard Tools and Equipment
(1)
Bolt - 5/8-18, at least 3 inches long (76.2mm)
B.
Consumable Materials
(1)
D00054 Lubricant - Hydraulic System, MCS 352
(2)
D00196 Fluid - Hydraulic, BMS 3-11, Type IV, Class 1
(3)
D00149 Fluid - Hydrualic, BMS 3-11, Type IV, Class 2 (optional to Class 1)
C.
Parts
~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 17 | Thermal Relief Valve | 27-62-28 | 01 | 60 | | | 18 | Backup Ring | | | 85 | | | 19 | Packing (O-Ring) | | | 90 | | | 20 | Backup Ring | | | 55 | | | 21 | Packing (O-Ring) | | | 80 | | | 22 | Thermal Relief Valve Cap | | | 50 | 2......…........…...................................…..........….....….........1
D. References
(1)
AMM 12-12-01/301, Hydraulic Systems
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
E.
Access
(1)
Location Zone
574 Spoiler No. 6
674 Spoiler No. 7
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A
747-400
MAINTENANCE MANUAL
(2)
Access Panels
572CB Trailing Edge Lower, LH
672CB Trailing Edge Lower, RH
F.
Procedure
S 422-094
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