(2)  
WDM 31-51-17

 (3)  
SSM 31-51-07

 B.  Access
 (1)  Location Zone 211, 212 Passenger Cabin - Nose to First Door
 C.  Procedure
 S 864-025
 (1)  
Make sure the hydraulic power is not available to the airplane (AMM 29-11-00/201).

 S 864-002

 (2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P7 overhead circuit breaker panel
 1) 7A01 MAWEA PWR A
 2) 7A03 AURAL WARN L
 3) 7A04 AURAL WARN R
 4) 7B01 MAWEA PWR B
 5) 7G6 SPEED BRAKE AUTO CONT

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 31-51-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SPEED BRAKE CONTROL LEVER
DN POSITION
INFLIGHT
STOP LEVER
MANUAL INPUT CONTROL ROD
DRUM MECHANISM
A 747-400 MAINTENANCE MANUAL 
FLIGHT FLIGHT DETENT UP POSITION (STOP) POSITION 
SEE  A 
CONTROL ROD ACTUATOR INPUT 
SWITCH ARMING  AUTOMATIC SPEED BRAKE ACTUATOR  CAM  SPRING TENSION  SWITCH BRAKE SPEED 
BRACKET SUPPORT LOWER  ACTUATOR INPUT CONTROL ROD CAM FOLLOWER ROLLER 
SWITCH ARMING 
STRIKE PLATE ARMING SWITCH 
FWD  A 
Speed Brake Switch Installation Figure 401 

H59210
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-004
 (3)  Remove the speed brake switch as follows:
 (a)  
Disconnect the electrical connectors from the switch.

 (b)  
Remove the screws and washers that hold the speed brake switch to the mount plate.

 (c)  
Remove the speed brake switch.

 TASK 31-51-04-404-005
 3.  Speed Brake Switch Installation (Fig. 401)_______________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

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

 (3)  
AMM 45-10-00/201, Central Maintenance Computer System

 (4)  
AIPC 27-62-55, Fig. 1

 B. Access
 (1)  Location Zone 211, 212 Passenger Cabin - Nose to First Door
 C. Procedure
 S 424-006
 (1)  Install the speed brake switch as follows:
 (a)  
Put the speed brake switch on the mount plate.

 (b)  
Install the screws and washers that hold the speed brake switch to the mount plate.

 (c)  
Tighten the screws.

 (d)  
Connect the electrical connector to the speed switch.

 S 864-009
 (2) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P7 overhead circuit breaker panel
 1) 7A01 MAWEA PWR A
 2) 7A03 AURAL WARN L
 3) 7A04 AURAL WARN R
 4) 7B01 MAWEA PWR B
 5) 7G6 SPEED BRAKE AUTO CONT

 D. Speed Brake Switch Installation Test
 S 864-010
 (1) Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 864-020

 (2)  On the CDU, prepare the CMC for input monitoring (AMM 45-10-00/201).
 (a)  
Push the line select key (LSK) adjacent to the <CMC prompt until you see the CMC menu.

 (b)  
　
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