21-31-00
 ALL  ú
 ú  01  Page 127
 ú  Mar 15/96 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F61110
A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 2 (BLOCK 3)

NO
NO

4 DO THIS TASK: "PRESSURIZATION OUTFLOW VALVE

RESISTANCE TESTS"
(AMM 21-31-00/501).
WAS THERE A PROBLEM WITH THE RESISTANCE VALUES MEASURED DURING THE TEST?

YES
NO

5 DO THIS TASK:
"FORWARD OUTFLOW VALVE SYSTEM

TEST" (AMM 21-43-11/501).
 DID THE FORWARD OUTFLOW VALVE OPERATE NORMALLY?

YES
YES
6 EXAMINE THE AMBIENT SENSE LINE FROM THE CABIN PRESSURE

CONTROLLER PORT TO THE PITOT-
STATIC PORT FOR BLOCKAGE AND
LEAKAGE.
 IS THERE BLOCKAGE OR LEAKAGE IN THE SENSE LINE?

NO
YES
7 DO THIS TASK: "BLEED AIRCONTROL SYSTEM OPERATIONAL

TEST" (AMM 36-11-05/501).
WAS THE DUCT PRESSURE TOO LOW DURING THE TEST?
NO

56 REPLACE THE AFT OUTFLOW VALVE (AMM 21-31-11/401).
 IF THE PROBLEM CONTINUES, DO A CHECK OF THE WIRING AND REPAIR THE PROBLEMS THAT YOU FIND.

57 REPLACE THE FORWARD
OUTFLOW VALVE (AMM 21-43-11/
401).
IF THE PROBLEM CONTINUES, DO A CHECK OF THE WIRING AND REPAIR THE PROBLEMS THAT YOU FIND.

58 REMOVE THE BLOCKAGE IN THE SENSE LINE OR REPLACE THE SENSE LINE IF THERE IS LEAK-AGE.

59 DO THE TROUBLESHOOTING
TASK: "LOW DUCT PRESSURE.
THE ENGINE WAS THE BLEED
SOURCE (AMM 36-11-05/101,
FIG. 104).
 REPAIR THE PROBLEMS THAT YOU FIND.

60 DO THE "FLOW AND PRIMARY
HEAT EXCHANGER TEST" FOR EACH
AIR CONDITIONING PACK IN THIS
TASK: "OPERATIONAL TEST -
AIR CYCLE SYSTEM"
(AMM 21-51-00/501).
REPLACE THE COMPONENT(S) OF EACH AIR CONDITIONING PACK WHICH CAUSED THE LOW AIR FLOW PROBLEM.
 IF THE PROBLEM CONTINUES, DO A CHECK OF THE WIRING AND REPAIR THE PROBLEMS THAT YOU FIND.
System Fails in AUTO Mode, STANDBY Mode Normal
Figure 106 (Sheet 3)

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 21-31-00
 ALL  ú ú 01 Page 128 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F61099
A
737-300/400/500MAINTENANCE MANUAL
 PRESSURIZATION CONTROL SYSTEM - MAINTENANCE PRACTICES
_____________________________________________________
 1.  General_______
 A.  You must do an operational test of the pressurization control system for this procedure. The operational test makes sure that the pressurization control system can change modes of operation. The test does not do a full check of the pressurization control system. The test does makes sure the system can change from automatic to standby. The test also makes sure that standby and manual control will operate during the flight if it is necessary. Refer to the Adjustment/Test for a full functional test of the system.
 B.  The L and R PACK switches and RECIRC FAN switch must be OFF to do an operational test of the forward outflow valve. The check of the forward outflow valve is done during the operation of the aft outflow valve.
 TASK 21-31-00-702-001
 2.  Operational Test - Pressurization Control System________________________________________________
 A.  References
 (1)  24-22-00/201, Manual Control
 B.  Access
 (1)  Location Zones
 101 Left Control Cabin
 102 Right Control Cabin
 208 Forward Cargo Compartment

 C.  Prepare for the test
 S 862-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 (2)  
Set the L and R PACK switches to OFF.

 (3)  
Set the RECIRC FAN switch(es) to OFF.

 S 862-005

 (4)
Make sure these circuit breakers on the P6 panel are closed:

 S 862-003
 S 862-004
 (a)  BEJ 061, 062, 101-112 WITH SB 21-1118, AND BEJ 113; 6B6, NO.2 AIR DATA COMPUTER-2 26V AC
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