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A
737-300/400/500MAINTENANCE MANUAL
 F. Put the Airplane Back to Its Usual Condition
 S 864-017
 (1)  
Remove the electrical power if it is not necessary (Ref 24-22-00/201).

 S 414-018

 (2)
Close the overhead ceiling panel (Ref 25-21-45/401).

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A

737-300/400/500MAINTENANCE MANUAL
CABIN AIR SUPPLY TEMPERATURE BULB
SEE A
CABIN AIR SUPPLY
TEMPERATURE BULB

SEE B
FWD
OVERHEAD DISTRIBUTION MANIFOLD 
O-RING 
A  1 
TEMPERATURE BULB 
ELECTRICAL 
CONNECTOR 

TEMPERATURE BULB SEE B
FWD
B
DISTRIBUTION DUCTS FWD
OVERHEAD DISTRIBUTION DUCT
A2
1AIRPLANES WITH OVAL AIR DUCTS
AIRPLANES WITH ROUND AIR DUCTS2
Cabin Air Supply Temperature Bulb Installation Figure 401
E85132
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737-300/400/500MAINTENANCE MANUAL
 PASSENGER CABIN TEMPERATURE BULB - REMOVAL/INSTALLATION
_______________________________________________________
 TASK 21-62-25-004-038
 1.  Remove the Temperature Bulb for the Passenger Cabin (Fig. 401)___________________________________________________
 A. References
 (1)  
24-22-00/201, Electrical Power

 (2)  
25-23-61/201, Main Passenger Cabin Passenger Service Unit

 B. Access
 (1)  Location Zone
 107 Forward Half of Cabin

 C. Prepare for the Removal
 S 864-001
 (1) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6-4, circuit breaker panel for the load control 1) TEMP IND
 S 984-002
 (2)  Get access to the five screws that attach the bullnose to the PSU beam.
 (a)  Lower the passenger service unit for the main passenger cabin assembly (PSU).
 S 034-003
 (3)  Remove the screws and the bullnose (Ref 25-23-61/201).
 D. Remove the Bulb
 S 034-004
 (1)
Disconnect the electrical connector from the temperature bulb.

 (2)  
Remove the lockwire and remove the temperature bulb.

 S 034-012
 TASK 21-62-25-404-013
 2.  Install the Temperature Bulb for the Passenger Cabin (Fig. 401)____________________________________________________
 A. References
 (1)  
24-22-00/201, Electrical Power

 (2)  
25-23-61/201, Main Passenger Cabin Passenger Service Unit

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737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone
 107 Forward Half of Cabin

 C. Procedure
 S 434-014
 (1)  
Install the temperature bulb in the sensor duct and install the lockwire.

 S 434-024

 (2)  
Connect the electrical connector to the temperature bulb.

 D. Do a Test of the Temperature Bulb for the Passenger Cabin
　
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