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 WARNING:_______OUTFLOW VALVE IS MOTOR OPERATED. DO NOT INSERT HAND OR TOOLS IN OUTLET DURING ANY GROUND OPERATION OR INJURY TO PERSONNEL MAY OCCUR.
 B.  Outflow valve operation may be observed from outside the airplane by looking into the valve outlet. Check the outflow valve for movement if the VALVE position indicator does not move. This would indicate a possible malfunction in the valve position indication system.
 C.  To simulate a flight condition with the airplane on the ground, the landing gear lights circuit breaker must be opened to de-energize the airplane landing gear ground safety sensor relay. The AUTO FAIL and STANDBY lights will remain on continuously if the circuit breakers for the 28-volt dc bus No. 1 and 2 are both open. This is normal for power input conditions. To remedy the situation, close all circuit breakers and place FLT-GRD switch to GRD.
 D.  The rate of cabin pressure change is shown on the CLIMB indicator in feet per minute.
 E.  If a rapid cabin pressure rate-of-climb (depressurization) occurs during descent and the forward and aft outflow valves are operating properly, check the entire airframe for signs of obvious air leakage such as around door seals and skin cracks. Such cracks or leaks will be well defined with a nicotine stain. If no obvious leaks are present perform cabin depressurization and excessive leak checks per Chapter 5.
 2.  Fault Isolation Procedures__________________________
 A. Figure 101 Cabin Pressure Control System AUTO Mode Troubleshooting
 (1)  
Procedure 1 OFF SCHED DESCENT Light Does Not Illuminate During Vacuum Test (AMM 21-31-00/501)

 (2)  
Procedure 2 OFF SCHED DESCENT Light Comes On But Does Not Go Out After a Short Time (approximately 3 minutes) in AUTO Mode.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
 (3) (4)  Procedure 3 Procedure 4  OFF SCHED DESCENT Light Comes On Momentarily (1 to 10 seconds) Upon Touchdown.Ground Pressurized or Ground Unpressurized Circuits Not Functional
 (5) (6) (7)  Procedure 5 Procedure 6 Procedure 7  AUTO FAIL and STANDBY Lights Do Not Come On with all Power Applied with Mode Selector in CHECK.STANDBY Light Comes On when Fault is Checked with STBY Mode InoperativeAUTO FAIL Light Fails to Reset or STANDBY Light Continually on Regardless of Control Panel Settings for AUTO or STBY. AC and DC MAN Normal.
 (8)  Procedure 8  Outflow Valve Does Not Respond to Barometric Correction. Ground Unpressurized and Ground Pressurized Checks are Normal.
 (9)  Procedure 9  Outflow Valve Does Not Respond Properly to Isobaric Schedule Check. Barometric Correction Check is Good
 and Ground Unpressurized and Ground Pressurized Checks are good.

Figure 102 Cabin Pressure Control System STANDBY Mode Troubleshooting
 (1)
Procedure 1  STANDBY Light Not Illuminated.

 (2)  
Procedure 2 Outflow Valve Does Not Respond to Isobaric Schedule Check. Barometric Correction Check is Good and Ground Unpressurized and Ground Pressurized Checks are Good.

 (3)
Procedure 3  Outflow Valve Does Not Respond at All.

 (4)  
Procedure 4 Outflow Valve Does Not Go Open with FLT-GRD Switch in GRD. Other Responses Normal

 (5)  
Procedure 5 Outflow Valve Does Not Respond to Barometric Correction Input. Ground Operation Normal.

 (6)
Procedure 6  Outflow Valve Does Not Respond Properly to CAB ALT

 Control.Figure 103 Cabin Pressure Control System DC MANUAL Mode Troubleshooting

 (1)  
Procedure 1 Outflow Valve Does Not Respond in Ground or Flight Operation.

 (2)
Procedure 2  MANUAL Light Does Not Illuminate.

 (3)
Procedure 3  Outflow Valve Responds to OPEN/CLOSE Toggle Switch in

 One Direction Only.Figure 104 Cabin Pressure Control System AC MANUAL Mode Troubleshooting

 (1)  
Procedure 1 Outflow Valve Does Not Respond in Ground or Flight Operation.

 (2)
Procedure 2  Outflow Valve Responds to OPEN/CLOSE Toggle Switch in

 One Direction OnlyFigure 104A Cabin Pressure Controller Internal Fuse Tests

 (1)
Procedure 1  AC and DC Clutch Coil Fuse Test (Fuse F2 and Fuse F1)

　
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