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1. General
A.  The speed brake takeoff warning switch (S651) is installed on the upper left forward end of the control stand and is operated by an actuator on the speed brake lever.
2.  Equipment and Materials
A.  Ohmmeter
3.  Remove Speed Brake Takeoff Warning Switch (S651) (Fig. 401)
A.  Open LANDING GEAR LIGHTS circuit breaker on P6 panel.
B.  Remove switch cover from control stand.
C.  Disconnect electrical leads from switch.
D.  Remove nuts and screws and remove switch (detail A).
E.  Remove actuator from switch.
4.  Install Speed Brake Takeoff Warning Switch (S651) (Fig. 401)
A.  Place switch actuator on switch and install together on indicator plate (detail A). Do not tighten fasteners until switch adjustment is completed.
B.  Adjust switch as follows:
(1)  
Place speed brake lever in DOWN position.

(2)  
Lower switch until clear of lever mounted switch actuator.

(3)  
Connect ohmmeter across terminals C and NC of switch and check that switch is not actuated (continuity through switch).

(4)  
Adjust switch upward against lever mounted switch actuator until switch actuates (no continuity through switch).

(5)  
Tighten attachment fasteners.

(6)  
Remove ohmmeter and connect electrical wiring to switch terminals.

C.  Test speed brake takeoff warning switch (Ref 31-26-0, Adustment/Test).
563 
Aug 15/77  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  31-26-26 Page 401 

Speed Brake Takeoff Warning Switch Installation  563 
31-26-26  Figure 401  Feb 15/77 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

CABIN ALTITUDE WARNING SWITCH - REMOVAL/INSTALLATION
1. General
A.  The cabin altitude warning switch is located on the underside of the control cabin floor near the airplane centerline at station 192. Access is gained by removing access door 1103 from just forward of the nose wheel well.
2.  Remove Cabin Altitude Warning Switch (Fig. 401)
A.  Remove access door 1103.
B.  Disconnect electrical plug at warning switch.
C.  Remove switch mounting fasteners and remove switch.
3.  Install Cabin Altitude Warning Switch (Fig. 401)
A.  Position switch against floor panel and install fasteners.
B.  Connect electrical connector to switch.
C.  Install access door 1103.
D.  Test Cabin Door Altitude Warning Switch
(1)  
Provide electrical power.

(2)  
Check that following circuit breakers are closed:

(a)  
LEVER LATCH AND PRESS WARNING

(b)  
AURAL WARN

 

(3)  
Connect vacuum source to vent port of switch.

(4)  
Evacuate system to about 5 psi vacuum (10 psia).

(5)  
Check that warning horn sounds intermittently,

(6)  
Press ALTITUDE HORN CUTOUT switch and check that horn stops blowing.

(7)  
Remove vacuum source electrical power, if no longer required.

 

501  Cabin Altitude Warning Switch Installation 
Feb 15/77  Figure 401  31-26-31 
Page 401 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 

　
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