(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 32-09-02/201, Air/Ground Relay System
(4)
AMM 31-61-00/201, Integrated Display System
B.
Access
(1)
Location Zone
221 Control Cabin
C.
Thermal Relief Valve Leakage Check
S 865-191
(1)
Do this task: "Spoiler/Speedbrake Deactivation".
S 985-182
(2)
Use hand force only to push up with a load of 30-40 lbs on the trailing edge surface of the spoiler panel. If the surface moves up and continues to move with the load applied, the thermal relief valve is defective.
NOTE: With a serviceable thermal relief valve it should not be
____
possible to move the surface up.
S 965-183
(3)
If the outboard flight spoiler thermal relief valve is defective, then do these tasks to replace the valve:
(a)
"Remove Thermal Relief Valve" (AMM 27-61-05/201).
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747-400 MAINTENANCE MANUAL
(b) "Install Thermal Relief Valve" (AMM 27-61-05/201).
S 965-189
(4)
If the inboard flight spoiler thermal relief valve is defective, then do these tasks to replace the valve:
(a)
"Remove Thermal Relief Valve" (AMM 27-61-04/201).
(b)
"Install Thermal Relief Valve" (AMM 27-61-04/201).
S 965-190
(5)
If the ground spoiler thermal relief valve is defective, then do these tasks to replace the valve:
(a)
"Remove Thermal Relief Valve" (AMM 27-62-05/201).
(b)
"Install Thermal Relief Valve" (AMM 27-62-05/201).
S 715-184
(6)
If the thermal relief valve is replaced, do this task: "Operational Test of the Spoiler Control System" (AMM 27-61-00/501).
D.
Prepare for the Operational Test of the Spoiler Control System
S 865-002
(1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 865-003
(2)
Do this task: "Supply Hydraulic Power" (AMM 29-11-00/201).
S 865-004
(3)
Make sure the FLT CONTROL HYD POWER - WING switches on the pilot's overhead panel P5 are in the NORM position.
S 865-005
(4)
Do this task to supply power to the EICAS system: "Airplane System Data Access" (AMM 31-61-00/201).
E.
Do the Operational Test of the Spoiler Control System
S 715-006
(1)
Do the test of the spoiler control system with the speed brake lever in the DOWN position:
(a)
Put the aileron trim in the neutral position.
(b)
Put the speed brake lever in the DOWN position.
(c)
Turn the aileron control wheel fully clockwise. 1) Make sure the spoilers No. 1 thru 5 are in the fully down
position. 2) Make sure that spoiler No. 8 is up 20 degrees. 3) Make sure that spoilers No. 9 thru 12 are in the fully up
position (45 degrees). 4) Make sure the trailing edges of spoilers No. 9 and 10, and No. 11 and 12 align in the limit of 0.50 inch.(12.7mm) 5) Make sure the trailing edges of spoilers spoilers No. 10 and 11 align in the limit of 1.40 inches.(35.6mm) 6) Make sure the left spoiler position indicator on the EICAS status page is at the lower scale mark.
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