S 862-005

 (2)  
Get access to the terminals of the AFT OUTFLOW HEATER circuit breaker.

 S 762-007

 (3)  
Measure the electrical resistance at the terminal 2 of the AFT OUTFLOW HEATER circuit breaker.

 S 762-008

 (4)  
Make sure the electrical resistance at terminal 2 is 25 to 45 ohms.

 S 752-009

 (5)  
Do these steps if the electrical resistance at terminal 2 is not 25 to 45 ohms:

 (a)  Apply a source of cold air or a heat sink to the thermostat until the electrical resistance is 25 to 45 ohms.
 NOTE: The temperature of the cold air or heat sink must be
____ approximately 32°F (0°C). The location of the thermostat is shown in Fig. 201.
 S 862-010
 (6)
Close the AFT OUTFLOW HEATER circuit breaker on the P6-4 panel.

 (7)  
Make sure the thermostat opens in less than 10 minutes.

 (8)  
Open the AFT OUTFLOW HEATER circuit breaker again.

 (9)  
Measure the electrical resistance at the terminal 2 again.

 S 762-014

 (10)
 Make sure the electrical resistance shows there is open electrical circuit.

 S 732-011
 S 862-012
 S 762-013
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737-300/400/500MAINTENANCE MANUAL
 S 862-015
 (11) Close the AFT OUTFLOW HEATER circuit breaker on the P6-4 panel.
 G. Put the Airplane Back to Its Usual Condition
 S 862-016
 (1) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6-4 panel 1) PRESSURIZATION CONTROL (6 locations) 2) OUTFLOW VALVE HEATER
 S 862-017
 (2)  Remove the electrical power if it is not necessary (Ref 24-22-00/201).
 TASK 21-31-12-002-027
 3.  Outflow Valve Heated Gasket Removal (Fig. 201)___________________________________
 A. References
 (1)  21-31-11/401, Cabin Pressurization Outflow Valve
 B. Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 C. Procedure
 S 012-019
 (1)  
Remove the cabin pressurization outflow valve (Ref 21-31-11/401).

 S 032-020

 (2)
Cut the wires which attach the gasket to the ship's wiring.

 (3)  
Remove the gasket.

 S 022-021
 TASK 21-31-12-402-026
 4.  Outflow Valve Heated Gasket Installation (Fig. 201)________________________________________
 A. References
 (1)  21-31-11/401, Cabin Pressurization Outflow Valve
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737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 C. Procedure
 S 422-022
 (1) Put the gasket in its position.
 NOTE: Make sure the gasket is installed with the thermostat
____ installed on the forward side of the outflow valve and towards the outboard end of the valve.
 S 432-023
 (2) Make the wires of the gasket and the ship's wiring into a splice.
 NOTE: Keep the length of the wires the same as the initial wires.
____
 S 412-024
 (3)
Install the cabin pressurization outflow valve (Ref 21-31-11/401).

 (4)
Do the adjustment/test procedure for the gasket.

 S 732-025
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