F61080
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 21-31-00
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 ú  01  Page 124
 ú  Mar 15/96 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

FROM SHEET 3 (BLOCK 4)

YES
NO
5 GET ACCESS TO THE E/E

COOLING OVERBOARD EXHAUST
VALVE WHICH IS UNDER THE FLOOR
IN THE FORWARD CARGO COMPART-
MENT.
MANUALLY CLOSE THE EXHAUST VALVE WITH A WRENCH OR SCREW-DRIVER.
 DID THE EXHAUST VALVE CLOSE NORMALLY WITHOUT BIND-ING?
YES

The Cabin Pressure Control System (CPCS) Cannot Maintain Cabin Pressure Due to
Excessive Air Leakage or There Is a Problem with the Air Supply System
Figure 105 (Sheet 4)

F61082
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SYSTEM FAILS IN PREREQUISITES "AUTO" MODE,
NONE "STANDBY" MODE
NORMAL

MAN" MODE AND "DC MAN" MODE AND "DC MAN" MODES? OPERATE NORMALLY IN "AC MAN" DID THE AFT OUTFLOW VALVE (AMM 21-31-00/501). PRESSURIZATION CONTROL SYSTEM" THIS TASK: "SYSTEM TEST -FOR THE AFT OUTFLOW VALVE IN  VALVE (AMM 21-31-11/401). CONTROLLER (AMM 21-31-21/41). REPLACE THE CABIN PRESSURE IF THE PROBLEM CONTINUES, 
YES 
(BLOCK 3) SEE SHEET 2 

System Fails in AUTO Mode, STANDBY Mode Normal
Figure 106 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ú  01  Page 126
 ú  Mar 15/96 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F61096
A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 1 (BLOCK 2)

YES
YES

3 DO THIS TASK:
"FUNCTIONAL TEST OF THE PRES-SURE CONTROLLER"
(AMM 21-31-00/501).

____ THE TEST MEASURES
NOTE: VOLTAGES AT THE TEST PINS (OR TEST JACKS) ON THE CABIN PRESSURE CONTROLLER TO DETERMINE WHICH CABIN PRESSURE CONTROL SYSTEM COM-PONENTS HAVE FAILED.
WAS THERE A PROBLEM WITH THE VOLTAGES MEASURED AT THE TEST PINS (OR TEST JACKS)?

NO
SEE SHEET 3 (BLOCK 4)

55 DO THE APPLICABLE STEPS
WHICH CORRESPOND TO THE TEST
PINS (OR TEST JACKS) WHICH
HAD THE VOLTAGE PROBLEM:

1.
REPLACE THE CABIN PRESSURE CONTROL MODULE (AMM 21-31-25/401) IF THERE WAS A PROBLEM WITH THE VOLTAGES MEASURED AT TEST PINS A,B,C,E OR G (OR TEST JACKS 1,2,3,5 OR 7)

2.
REPLACE THE AFT OUTFLOW VALVE (AMM 21-31-11/401) IF THERE WAS A PROBLEM WITH THE VOLTAGES MEASURED AT TEST PINS J,K, OR L (OR TEST JACKS 9,10, OR 11). IF THE PROBLEM CONTINUES, REPLACE THE CABIN PRESSURE CONTROLLER (AMM 21-31-21/ 401)

3.
REPLACE THE CABIN PRESSURE CONTROLLER (AMM 21-31-21/ 401) IF THERE WAS A PROBLEM WITH THE VOLTAGES MEASURED AT TEST PINS M,N,P, OR R (OR TEST JACKS 12,13,14, OR 15)

4.
REPLACE THE CAPTAIN'S ALTIMETER (AMM 34-12-21/ 401) IF THERE WAS A PROBLEM WITH THE VOLTAGES MEASURED AT TEST PIN D (OR TEST JACK 4). IF THE PROBLEM CONTINUES, DO A CHECK OF THE WIRING BETWEEN THE CAPTAIN'S ALTIMETER AND THE CABIN PRESSURE CONTROLLER (WDM 21-34-01)

5.
REPLACE THE FIRST OFFICER'S ALTIMETER (AMM 34-12-21/ 401) IF THERE WAS A PROBLEM WITH THE VOLTAGES MEASURED AT TEST PIN F (OR TEST JACK 6). IF THE PROBLEM CONTINUES, DO A CHECK OF THE WIRING BETWEEN THE FIRST OFFICER'S ALTIMETER AND THE CABIN PRESSURE CONTROLLER (WDM 21-34-01).

System Fails in AUTO Mode, STANDBY Mode Normal
Figure 106 (Sheet 2)

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