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A 737-300/400/500MAINTENANCE MANUAL
 (f)  
Use shims to lift the speed brake lever an additional 0.01 inch or more. 1) Make sure there is no continuity between the C and NO

 terminals.

 (g)  
Remove the shims.

 (h)  
Tighten the attachment screws.

 (i)  
Connect the switch wires.

 S 084-010
 (4)  
Remove the ohmmeter.

 S 864-011

 (5)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  P6 Load Control Center - Right
 1) LANDING GEAR LIGHTS

 S 714-009
 (6)  Do this task: "Takeoff Warning System Test" (Ref 31-26-00/501).
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737-300/400/500MAINTENANCE MANUAL
 CABIN ALTITUDE WARNING SWITCH - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The tasks are a removal and an
 installation of the cabin altitude warning switch (S128).

 TASK 31-26-31-024-002
 2.  Cabin Altitude Warning Switch Removal_____________________________________
 A.  Access
 (1)  
Location Zone
 203 Nose Wheel Well

 (2)  
Access Panel
 1103L Forward Access Door

 B.  Procedure
 S 864-001
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center - Right
 1) AURAL WARN
 2) LEVER LATCH AND PRESS WARN

 S 014-003
 (2)  
Remove the forward access door 1103L.

 S 024-004

 (3)  
Remove the switch:

 (a)  
Disconnect the electrical plug.

 (b)  
Remove the attachment fasteners.

 (c)  
Remove the switch.

 TASK 31-26-31-424-005
 3.  Cabin Altitude Warning Switch Installation__________________________________________
 A.  Standard Tools and Equipment
 (1)  Vacuum source - 5 psi vacuum (10 psia), with an adapter for a hose connection to the vent port of the cabin altitude switch.
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A 737-300/400/500MAINTENANCE MANUAL

PLUG

Cabin Altitude Warning Switch Installation

Figure 401

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737-300/400/500MAINTENANCE MANUAL
 B. References
 (1)  
24-22-00/201, Manual Control

 (2)  
31-26-00/501, Aural Warning System

 C. Access
 (1)  
Location Zone
 101/102 Control Cabin
 203 Nose Wheel Well

 (2)  
Access Panel
 1103L Forward Access Door

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

 (b)  
Attach the fasteners.

 (c)  
Connect the electrical connector to the switch.

 S 414-007
 (2)  
Install the forward access door.

 S 864-008

 (3)  
Supply electrical power (Ref 24-22-00/201).
　
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