31-26-24
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 SPEED BRAKE TAKEOFF WARNING SWITCH - REMOVAL/INSTALLATION
_________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The tasks include a removal and an installation of the speed brake takeoff warning switch (S651).
 B.  The switch is installed on the control stand in the top left forward position. The switch is operated by an actuator on the speed brake lever.
 TASK 31-26-26-024-001
 2.  Speed Brake Takeoff Warning Switch Removal__________________________________________
 A.  Access
 (1)  Location Zone
 101/102 Control Cabin

 B.  Procedure
 S 864-002
 (1) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6 Load Control Center - Right
 1) LANDING GEAR LIGHTS

 S 014-003
 (2)  
Remove the switch cover from the control stand.

 S 024-004

 (3)  
Remove the switch:

 (a)  
Disconnect the electrical wires from the switch.

 (b)  
Remove the attachment nuts and screws.

 (c)  
Remove the switch (Fig 401, Detail A).

 (d)  
Remove the actuator from the switch.

 TASK 31-26-26-424-005
 3.  Speed Brake Takeoff Warning Switch Installation_______________________________________________
 A.  Standard Tools and Equipment
 (1)  Ohmmeter
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

INDICATOR PLATE
SPEEDBRAKE LEVER
SWITCH 
TAKEOFF  COVER 
WARNING 
SWITCH  CONTROL 
(S651)  STAND 
SEE  A 

SPEEDBRAKE LEVER
LEVER ACTUATOR
SWITCH ACTUATOR
INDICATOR
PLATE LEVER DOWN AND LOCKED DETENT
TAKEOFF WARNING
SWITCH (S651)
SWITCH ATTACHMENT STUD (IN SLOTTED HOLE)
SWITCH ATTACHMENT SCREW
CONTROL STAND
A

Speedbrake Takeoff Warning Switch Installation

Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B.  References
 (1)  31-26-00/501, Aural Warning System
 C.  Access
 (1)  Location Zone
 101/102 Control Cabin

 D.  Procedure
 S 424-006
 (1)  Install the switch:
 (a)  
Put the actuator on the switch.

 (b)  
Attach the switch to the indicator plate with the bolts (Fig 401, Detail A).

 NOTE: Do not tighten the attachment nuts until you adjust the
____
 switch.

 S 864-007
 (2)  
Put the speed brake lever in the DOWN position.

 S 824-008

 (3)  
Adjust the switch:

 (a)  
Lift the speed brake lever out of the DOWN position and move it aft.

 (b)  
Connect an ohmmeter between terminals C and NC of the switch. 1) Make sure there is continuity between the terminals.

 (c)  
Put the speed brake lever back into the DOWN position.

 (d)  
Connect an ohmmeter between terminals C and NO of the switch. 1) Make sure there is continuity between the terminals. 2) If it is necessary, adjust the switch attachment screw

 until you get continuity.

 (e)
Use shims to lift the speed brake lever directly up 0.01 to

 0.02 of an inch.
 1)  Make sure the continuity stays between the C and NO terminals.
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