(3)  
Do this task: "Remove Electrical Power" (AMM 24-22-00/201).

 S 865-059
 S 095-138
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  Do this task: "Wing Landing Gear Door Lock Removal"
 (AMM 32-00-30/201).

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747-400 MAINTENANCE MANUAL
 TASK 27-62-00-735-061
 4.  System Test - Speed Brake Control System________________________________________
 A. General
 (1)  
This procedure does a check of the manual and the automatic operation of the flight and ground spoilers.

 B.
Standard Tools and Equipment

 (1)  
Spring scale, 0 to 50 pounds capacity

 (2)  
Stopwatch

 C.
References

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

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

 (3)  
AMM 31-61-00/201, Integrated Display System

 (4)  
AMM 32-09-02/201, Air/Ground Relay System

 D.
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 E.
Prepare for the Speed Brake Control System Test

 S 865-062
 (1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-063

 (2)
Do this task: "Supply Hydraulic Power" (AMM 29-11-00/201).

 S 865-064

 (3)  
Do this task to supply power to the EICAS system: "Airplane System Data Access" (AMM 31-61-00/201).

 S 865-065

 (4)  
Monitor the thrust resolver angle (TRA) on the EICAS maintenance display.

 F.
Do a Test of the Manual Control of the Speed Brake Control Lever

 (1)  
Move the speed brake lever to the DN position.

 S 215-139

 (2)  
Make sure the speed brake quadrant at the sequence mechanism touches the stop.

 S 865-066
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747-400 MAINTENANCE MANUAL
 G. Examine the Operation of the Spoilers
 S 865-067
 (1)  
Make sure the captain's aileron control wheel is in the neutral position.

 S 215-069

 (2)  
Make sure all spoilers are in the fully down position.

 S 725-070

 (3)  
Do a test of the operation from the DN to the FLIGHT DETENT
 position:

 (a)  
Move the speed brake lever from the DN position to the FLIGHT DETENT position.

 (b)  
Make sure that spoilers No. 3, 4, 9 and 10 are up 30.80 |0.98 inches (782.32+/-24.89mm) (45 |1.5 degrees).

 (c)  
Make sure that spoilers No. 5 6, 7 and 8 are up 18.70 |1.45 inches (474.98+/-36.83mm) (20 |1.5 degrees).

 S 725-071
 (4)  
Do a test of the operation from the FLIGHT DETENT to the UP
 position:

 (a)  
Move the speed brake lever from the FLIGHT DETENT position to the UP position.

 (b)  
Make sure that spoilers No. 1, 2, 11 and 12 move up 30.80 |0.98 inches (782.32+/-24.89mm) (45 |1.5 degrees).

 (c)  
Make sure that spoilers No. 5 thru 8 move up 41.78 |1.68 inches (1061.21+/-42.67mm) (45 |1.5 degrees).

 S 725-072
 (5)  
Do a test of the operation from the UP to the FLIGHT DETENT
 position:

 (a)  
Move the speed brake lever from the UP position to the FLIGHT DETENT position.

 (b)  
　
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