21-31-11
 ALL  ú ú 01 Page 803 ú Jul 15/98
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A
737-300/400/500MAINTENANCE MANUAL
 S 868-013
 (12) Remove the safety collars and close these circuit breakers on the P6 panel:
 (a)
AUTOMATIC AC and DC

 (b)
STBY AC and DC

 (c)
MAN AC and DC

 S 868-014
 (13) Remove electrical power (Ref 24-22-00/201).
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 21-31-11
 ALL  ú ú 01 Page 804 ú Nov 15/92
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737-300/400/500MAINTENANCE MANUAL
 OUTFLOW VALVE HEATED GASKET - MAINTENANCE PRACTICES
___________________________________________________
 1.  General_______
 A.  This procedure has three tasks for the outflow valve heated gasket. The first task is the adjustment/test of the gasket. The second task is the removal of the gasket. The third task is the installation of the gasket.
 B.  The outflow valve is in the equipment bay of the aft cargo compartment. The gasket for the outflow valve seals the valve to the airplane structure. The gasket has a heating element, a thermostat, and an overheat fuse. The gasket supplies heat during flight at high altitudes in order that the valve will not freeze in the closed position.
 C.  The P6-4 circuit breaker panel supplies 115v ac power to the gasket. The thermostat keeps the temperature of the area between 40|5°F (4.4|2.7°C) and 70|5°F (21.1|2.7°C). The overheat fuse will open if the gasket temperature gets to approximately 165|5°F (73.9|2.8°C).
 TASK 21-31-12-702-018
 2.  Outflow Valve Heated Gasket Adjustment/Test___________________________________________
 A.  Special Tools and Equipment
 (1)  Source of cold air or ice (to cool the gasket thermostat to approximately 35°F (1.7°C))
 B.  Standard Tools and Equipment
 (1)  Multimeter (to measure electrical resistance)
 C.  References
 (1)  24-22-00/201, Electrical Power
 D.  Access
 (1)  Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 220 Aft Cargo Compartment Equipment Bay

 E.  Prepare for the Test
 S 862-002
 WARNING:_______DO NOT OPERATE THE OUTFLOW VALVE. THE ACCIDENTAL OPERATION OF THE OUTFLOW VALVE CAN CAUSE INJURY TO PERSONS.
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6-4 panel 1) PRESSURIZATION CONTROL (6 locations)
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 21-31-12
 ALL  ú ú 01 Page 201 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
SAFETY RELIEF VALVES
CABIN PRESSURIZATION OUTFLOW VALVE
SEE A
FWD 
AC 
ACTUATOR 
ELECTRICAL  THERMOSTAT 
CONNECTOR 
AFT LATCH (3) 
HEATED 
GASKET 
WIRES 
DC 
ACTUATOR 
ELECTRICAL 
FWD  INBD  GASKET HEATED  CONNECTOR 
FWD LATCH (3) 
(NONROTATING LUGS) 
OUTFLOW VALVE 
A
Outflow Valve Heated Gasket 
Figure 201 

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 21-31-12
 ALL  ú ú 01 Page 202 ú Oct 25/84
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737-300/400/500MAINTENANCE MANUAL
 2) OUTFLOW VALVE HEATER
 S 862-004
 (2)  Supply electrical power (Ref 24-22-00/201).
 F. Do a Test of the Gasket
 S 862-006
 (1)
Open the AFT OUTFLOW HEATER circuit breaker on the P6-4 panel.
　
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