C. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
D.
Access
(1)
Location Zone
585 Spoiler No. 1
584 Spoiler No. 2
583 Spoiler No. 3
582 Spoiler No. 4
682 Spoiler No. 9
683 Spoiler No. 10
684 Spoiler No. 11
685 Spoiler No. 12
E.
Procedure
S 862-091
(1) Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 862-092
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 PRESSURE IN THE HYDRAULIC SYSTEMS, THE SPOILERS WILL AUTOMATICALLY RETRACT. THIS CAN CAUSE INJURY TO PERSONS.
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7G6, SPEED BRAKE AUTO CONT
S 862-093
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.
(3)
Do this task: "Hydraulic System Pressurization" (AMM 29-11-00/201).
S 862-094
(4)
Put the flap control lever in the 30-unit position to extend the outboard trailing edge flaps.
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747-400 MAINTENANCE MANUAL
S 012-095
WARNING: DO NOT PUT A PART OF YOUR BODY BETWEEN THE SPOILER AND THE WING
_______ UNLESS THE SPOILER ACTUATOR IS LOCKED OR THE HYDRAULIC POWER IS RELEASED. THIS CAN CAUSE INJURY TO PERSONS.
(5)
Open the applicable trailing edge access panel and lower the flaps, or lift the spoilers to get access to the spoiler control package.
(a)
Install the spoiler actuator locking tool if you lifted the spoilers.
S 862-097
(6)
Do this task: "Hydraulic System Depressurization"
(AMM 29-11-00/201).
S 862-098
(7)
Put the FLT CONTROL HYD POWER - WING switches for systems No. 2 and No. 3 on the pilots' overhead panel P5 to the SHUTOFF position.
S 862-099
(8)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P180, DC Power Distribution Panel
1) 180E6, LATERAL CONT VLV SYS 2
2) 180H23, LATERAL CONT VLV SYS 3
S 022-100
(9)
Remove the thermal relief valve:
(a)
Put a container below the spoiler control package to catch the hydraulic fluid.
(b)
Use a 5/16-18 bolt to remove the thermal relief valve cap (20) and the valve (21).
TASK 27-61-05-402-101
7. Thermal Relief Valve Installation (Fig. 201)
_________________________________
A. Standard Tools and Equipment
(1)
Bolt - 5/16-18, at least 3 inches long
B.
Consumable Materials
(1)
D00054, Lubricant - Hydraulic System, MCS 352
(2)
D00196, Fluid - Hydraulic, BMS 3-11, Class 1
(3)
D00149, Fluid - Hydraulic, BMS 3-11, Class 2 (optional to class 1)
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747-400 MAINTENANCE MANUAL
C. Parts
~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 20 | Thermal Relief Valve Cap | 27-61-05| 05 | 35 | | | 21 | Thermal Relief Valve | | | 50 | | | 22 | Backup Ring | | | 55 | | | 23 | Packing (O-ring) | | | 60 | | | 24 | Backup Ring | | | 40 | | | 25 | Packing (O-ring) | | | 45 | 2......…........…...................................…..........….....….........1
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