21-31-00
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A

737-300/400/500
MAINTENANCE MANUAL

PROCEDURE 1

PROCEDURE 2

PROCEDURE 3

OFF SCHED DESCENT light comes on momentarily (1 to 10 seconds) upon touchdown. 

Replace pressure control module (AMM 21-31-25/401). 

Cabin Pressure Control System AUTO Mode Troubleshooting
Figure 101 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 4
Ground pressurized or ground unpressurized circuits not functional. 

Test AC Manual Mode (AMM 21-31-00/501). IF -

Cabin Pressure Control System AUTO Mode Troubleshooting
Figure 101 (Sheet 2)

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A

737-300/400/500
MAINTENANCE MANUAL

PROCEDURE 5

PROCEDURE 6

STANDBY light comes on when fault is checked with STBY mode inoperative.Replace pressure controller (AMM 21-31-21/401).
PROCEDURE 7

AUTO FAIL light fails to reset or STANDBY light continually on regardless of control panel settings for AUTO or STBY. AC and DC MAN normal.
Replace pressure controller (AMM 21-31-21/401).
Cabin Pressure Control System AUTO Mode Troubleshooting
Figure 101 (Sheet 3)

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A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 8

_______TO AVOID INJURY TO PERSONNEL, STAY CLEAR OF LEADING EDGE SLATS,
WARNING: WHICH CAN MOVE AUTOMATICALLY (UNLESS OTHERWISE INHIBITED) DURING MAINTENANCE WHEN EITHER HYDRAULIC SYSTEM IS PRESSURIZED, AND TRAILING EDGE FLAPS ARE IN POSITION 1, 2, OR 5, AND NOSE OR MAIN LANDING GEAR AIR/GROUND RELAYS SENSE AN AIRBORNE CONDITION.
Cabin Pressure Control System AUTO Mode Troubleshooting
Figure 101 (Sheet 4)

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A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 9

Cabin Pressure Control System AUTO Mode Troubleshooting
Figure 101 (Sheet 5)

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A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 1

PROCEDURE 2

Outflow valve does not respond properly to isobaric schedule check. Barometric correction check is good and ground unpressurized and ground pressurized checks are good.
Check voltage at test pin H (or 8). Do the ADC altitude slew (AMM 21-31-00/501). IF -
VOLTAGE DROPS ABOUT 0.35 VOLTS/SEC VOLTAGE IS ZERO OR OUT OF RANGE -WHEN BUTTON IS PRESSED AND RETURNS TO Remove pressure controller ORIGINAL VALUE AT SAME RATE WHEN (AMM 21-31-21/401) and do a continuity BUTTON IS RELEASED - Replace pressure check into air data computer from wiper controller (AMM 21-31-21/401). to both sides of potentiometer across
pins D948B-12 to D948B-55 and pin D948B-2. Measure resistance across pins D948B-2 to D948B-55. IF -
　
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