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MINUTE  TO BE PLACED ON THE 
FOLLOWING: 
OUTFLOW_______ 
WAS AIRPLANE LEAK DOWN 
DURING PART III OF 
AMM 21-00-05/201 LESS 
THAN 100 SECONDS?  IF SO, 
FIRST CHECK FOR CABIN 
LEAKS THEN RUN PART III 
OF AMM 21-00-05/201 
TEST AGAIN. 
INFLOW______ 
IF THE CABIN LEAK DOWN 
RATE WAS ACCEPTABLE, THEN 
THE PACK PERFORMANCE 
NEEDS TO BE INVESTIGATED. 
DO VARIOUS PACK SYSTEM 
HEALTH CHECKS 
(AMM 21-51-00/501). 
SINGLE PACK - HIGH FLOW  CABIN RATE OF CHANGE IS  CONFIDENCE IS HIGH THAT 
MODE  -500 FEET/MINUTE OR  AIRPLANE WILL MAINTAIN 
GREATER  PRESSURE WITH SINGLE PACK 
IN HIGH FLOW MODE WHILE 
AT CRUISE. 

Airplane Ability to Maintain Cabin Pressure in Flight
on Single Pack Operation - Troubleshooting
Figure 101 (Sheet 1)

K19508
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SYSTEM  MINIMUM REQUIREMENT  REQUIREMENT SATISFIED NOYES 
AIRPLANE/STRUCTURE AIR  LEAK DOWN RATE FROM  CABIN LEAKAGE IS  INSPECT AND REPAIR ANY 
LEAKAGE  4.0 TO 2.5 PSID IS  ACCEPTABLE.  AIR LEAKAGE AS NOTED ON 
100 SECONDS GREATER THAN OR EQUAL TO  CONSIDER CONDUCTING OPERATORS MAY WISH TO  SPECIFICALLY: THE DATA SHEET. 
AMM 05-51-91/201  _________________DOORS AND HATCHES -
LEAKAGE TEST ON C-CHECK  MISSING OR TORN SEALS, 
BASIS AND MONITOR  POOR CONTACT BETWEEN DOOR 
PERFORMANCE.  SEALS AND AIRPLANE DUE TO 
DIRT, ETC., INSPECT 
SEALING COMPOUND AREAS 
AND REPAIR DOOR SEALS 
(AMM 52-09-10/801). 
FORWARD OUTFLOW VALVE -_____________________ 
DO A TEST OF THE VALVE 
(AMM 21-43-11/401). 
EE COOLING VALVE -________________ 
P/N 10-60701-1 THROUGH -6 
SHOULD CLOSE AT 2.0 TO 
2.8 PSID AND THE -7 VALVE 
SHOULD CLOSE AT .7 
TO 1.1 PSID. 
BILGE DRAINS - SHOULD____________ 
CLOSE AT APPROXIMATELY 
2.0 PSID: 
- CABIN PRESSURE SAFETY 
RELIEF VALVE 
- OUTFLOW VALVE SEAL 
- NEGATIVE PRESSURE 
RELIEF VALVE SEAL 
- WATER SERVICE PANEL 
- FLIGHT DECK WINDOWS 
- PRESSURE BULKHEAD 
PENETRATIONS SHOULD ALL 
HAVE MINIMAL LEAKAGE 
- SIGNIFICANT LEAKS 
SHOULD BE RESOLVED 
AS REQUIRED. 

Airplane Ability to Maintain Cabin Pressure in Flight
on Single Pack Operation - Troubleshooting
Figure 101 (Sheet 2)

K19382
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-00-05
 ALL  ú
 ú  01  Page 103
 ú  Jul 12/99 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SYSTEM  MINIMUM REQUIREMENT  REQUIREMENT SATISFIED NOYES 
PRESSURE - GROUND IDLE ENGINE BLEED DUCT  (AMM 36-11-05/101) SHOULD BE 15 TO 20 PSI 20%, DUCT PRESSURE WITH N1 AT APPROXIMATELY  AS SPECIFIED IN MPD 36-11-KS ITEMS. ON 1C - CHECK INTERVALS BLEED SYSTEM COMPONENTS CONTINUE TO MAINTAIN  AMM 36-11-05/501 TO PERFORMANCE. HELP IMPROVE SYSTEM DISTRIBUTION SYSTEM THE ENGINE BLEED AIR CONSIDER ACCOMPLISHING 
PRESSURE - FLIGHT IDLE ENGINE BLEED DUCT  (AMM 36-11-05/101) SHOULD BE 26 TO 38 PSI 33%, DUCT PRESSURE WITH N1 AT APPROXIMATELY 
CONTROL SYSTEM CABIN PRESSURIZATION  PRESSURE CAN BE AMM 21-00-05/201 CABIN COMPLETION OF AFTER SUCCESSFUL MAINTAINED  MAINTAINED. CABIN PRESSURE CAN BE CONFIDENCE IS HIGH THAT  (AMM 21-31-00/501). SYSTEM TEST CABIN PRESSURIZATION CONSIDER ACCOMPLISHING 

Airplane Ability to Maintain Cabin Pressure in Flight
on Single Pack Operation - Troubleshooting
Figure 101 (Sheet 3)
　
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