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737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | POWER | EFFECT ON | SYSTEM | SYSTEM | POWER | | LOSS |OUTFLOW VALVE| INDICATION | AVAILABLE | RESTORED | ................................................................................ |MAN AC MODE| | | | | ................................................................................
|MAN AC |Valve locked |Cabin pressure |AUTO, STBY |System returns to MAN |
| |in last |will not change|MAN DC |AC. |
| |position by |when valve is | | |
| |ac actuator |toggled | | |
................................................................................ |MAN DC |None |None |AUTO |No effect on MAN AC. | ................................................................................ |STANDBY AC |None |None |AUTO, MAN DC |No effect on MAN AC. | ................................................................................ |STANDBY DC |None |None |AUTO, STBY, |No effect on MAN AC. | | | | |MAN DC | | ................................................................................ |AUTO AC |None *[1] |None |STBY, MAN DC |No effect on MAN AC. | ................................................................................ |AUTO DC |None |None |AUTO, STBY, |No effect on MAN AC. | | | | |MAN DC | | ................................................................................ |MAN DC MODE| | | | | ................................................................................ |MAN AC |None |None |AUTO, STBY |No effect on MAN DC. | ................................................................................ |MAN DC |Valve locked |Cabin pressure |AUTO, MAN AC |System returns to MAN | | |in last |will not change| |DC. | | |position by |when valve is | | | | |ac actuator |toggled | | | ................................................................................ |STANDBY AC |None *[1] |None |AUTO, MAN AC |No effect on MAN DC. | ................................................................................ |STANDBY DC |None |None |AUTO, STBY |No effect on MAN DC. | | | | |MAN AC | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | POWER | EFFECT ON | SYSTEM | SYSTEM | POWER | | LOSS |OUTFLOW VALVE| INDICATION | AVAILABLE | RESTORED | ................................................................................ |AUTO AC |None |None |STBY, MAN AC |No effect on MAN DC. | ................................................................................ |AUTO DC |None |None |AUTO, STBY |No effect on MAN DC. | | | | |MAN AC | | 2...........….............…...............….............…......................1
*[1] Valve position indicator will indicate valve in closed postion *[2] System automatically transfers to standby *[3] No effect on outflow valve until standby transfer occurs
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737-300/400/500MAINTENANCE MANUAL
PRESSURIZATION CONTROL SYSTEM - TROUBLE SHOOTING
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1. General_______
A. Trouble shooting of the pressurization control system is broken down to correspond to the four operational modes. Refer to Adjustment/Test to verify that any mode is malfunctioning. The trouble shooting chart isolates the trouble to a particular system component, i.e. pressure controller, pressure control panel, cabin pressurization outflow valve, or to an input which is not part of the system i.e. air data computer or landing gear ground safety sensor. If adjustment/test shows pressurization control system is operable and a flight complaint is received, check the airplane ambient pressure sensing lines for leakage.
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