(a)
An extension of the flaps
(b)
An extension of the spoilers
(c)
The removal of the control package.
(2)
The control package installation procedure has these parts:
(a)
The installation of the control package
(b)
An adjustment of the control package
(c)
A check of the control package operation
(3)
The thermal relief valve removal has these parts:
(a)
An extension of the flaps
(b)
An extension of the spoilers
(c)
The depressurization of the hydraulic system No. 4
(d)
The removal of the thermal relief valve.
(4)
The thermal relief valve installation has these parts:
(a)
The installation of the new O-rings on the thermal relief valve
(b)
The installation of the thermal relief valve
(c)
The pressurization of the hydraulic system
(d)
A retraction of the flaps.
TASK 27-62-05-002-001
2. Ground Spoiler Control Package Removal (Fig. 201)______________________________________
A. Special Tools and Equipment
(1)
G27002-1, No. 6 and No. 7, Spoiler Actuator Locking Tool
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AIPC 27-62-07, Fig. 1
C.
Access
(1)
Location Zone
574 Spoiler No. 6
674 Spoiler No. 7
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-62-05
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A
747-400
MAINTENANCE MANUAL
(2)
Access Panels
572CB Trailing Edge Inboard, LH
672CB Trailing Edge Inboard, RH
D.
Procedure
S 862-003
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 HYDRAULIC 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 862-005
(2) Do this task to pressurize hydraulic systems No. 1 and 4:
"Hydraulic System Pressurization" (AMM 29-11-00/201).
S 862-089
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.
(4)
Put the speed brake lever in the UP position.
S 862-007
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A
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MAINTENANCE MANUAL
THERMAL RELIEF VALVE
TRAILING SEE A
EDGE BEAM
1. SPOILER
CONTROL
PACKAGE
LOCKING DEVICE
6. BOLT A
2. HYDRAULIC
7.
WASHERS (QTY 2)
LINE-UP 2
8.
NUT
(4 LOCATIONS)
3. HYDRAULIC LINE-UP 1
5A. SHIM
GROUND
(4 LOCATIONS) A SPOILER
4. HYDRAULIC 9. WASHER LINE-RETURN
5. HYDRAULIC 16. BOLT
GROUND
LINE-PRESSURE
SPOILER
EXTENSION 15. WASHER
CHECK VALVE
SEE B 14. NUT
CHECKNUT SWITCHING
VALVE
13. BUSHING 10. ANTIROTATION PLATE
A
1. CONTROL PACKAGE
9. WASHER
(PISTON ROD END)
17. THERMAL 11. NUT
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