21-31-00
 ALL  ú ú 01 Page 8 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 F. The characteristics of the pressurization control system in the event of
 a power loss and restoration are as follows: ~.............................................................................. | POWER | EFFECT ON | SYSTEM | SYSTEM | POWER | | LOSS |OUTFLOW VALVE| INDICATION | AVAILABLE | RESTORED | ................................................................................ |AUTO MODE | | | | | ................................................................................ |AUTO AC for|Valve locked |AUTO FAIL, AIR |STBY, MAN AC,|3 seconds after power |
 |up to 12.0 |in last  |COND and MASTER|MAN DC  |is restored system  |
 |seconds  |position by  |CAUTION lights |  |returns to AUTO.  |
 |  |ac actuator  |come on  |  |Lights go out.  |
 |  |*[1]  |  |  |  |

 ................................................................................ |AUTO AC for|None *[3] |AUTO FAIL, |STBY, MAN AC,|System still in | |14.9 |3.0 | |STANDBY, AIR |MAN DC |STANDBY. Place mode | |seconds | |COND and | |selector switch to | |*[2] | |MASTER CAUTION | |STBY then to AUTO. | | | |lights come on | |AUTO FAIL and STANDBY | | | | | |lights will go out. | ................................................................................ |AUTO DC |Outflow valve|AUTO FAIL, |STBY, MAN AC,|System returns to | | |response is |STANDBY, AIR |MAN DC |normal. | | |sluggish and |COND and MASTER| | | | |valve may go |CAUTION lights | | | | |to closed |may come on | | | ................................................................................ |Total power|Valve locked |AUTO FAIL, |None |3 seconds after power | |loss |in last |STANDBY, AIR | |is restored system | | |position by |COND and MASTER| |returns to AUTO. AUTO| | |ac actuator |CAUTION lights | |FAIL and STANDBY | | |*[1] |come on | |lights go out. | ................................................................................ |Total power|Valve locked |AUTO FAIL, |MAN DC |3 seconds after power | |loss except|in last |STANDBY, AIR | |is restored system | |MAN DC |position by |COND and MASTER| |returns to AUTO. AUTO| | |dc actuator |CAUTION lights | |FAIL and STANDBY | | |*[1] |come on | |lights go out. |
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 21-31-00
 ALL  ú ú 01 Page 9 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | POWER | EFFECT ON | SYSTEM | SYSTEM | POWER | | LOSS |OUTFLOW VALVE| INDICATION | AVAILABLE | RESTORED | ................................................................................ |STBY MODE | | | | | ................................................................................ |MAN DC |Valve locked |Cabin pressure |AUTO, MAN AC |System returns to | | |in last |may drift from | |STBY. | | |position by |altitude | | | | |ac actuator |selected | | | ................................................................................ |STANDBY AC |Valve locked |Cabin pressure |AUTO, MAN AC,|System returns to |
 |  |in last  |may drift from |MAN DC  |STBY.  |
 |  |position by  |altitude  |  |  |
 |  |dc actuator  |selected  |  |  |
 |  |*[1]  |  |  |  |

 ................................................................................ |STANDBY DC |None |None |AUTO, MAN AC,|No effect on STBY. | | | | |MAN DC | | ................................................................................ |AUTO AC |None |None |MAN AC, |No effect on STBY. | | | | |MAN DC | | ................................................................................ |AUTO DC |None |None |MAN AC, |No effect on STBY. | | | | |MAN DC | | ................................................................................ |Total power|Valve locked |AUTO FAIL, AIR |None |System returns to | |loss |in last |COND and MASTER| |STBY. AUTO FAIL light| | |position by |CAUTION lights | |goes out. | | |ac actuator |come on | | | ................................................................................ |Total power|Valve locked |AUTO FAIL, AIR |MAN DC |System returns to | |loss except|in last |COND and MASTER| |STBY. AUTO FAIL light| |MAN DC |position by |CAUTION lights | |goes out. | | |dc actuator |come on | | |
　
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