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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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A
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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