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F.  When the controller is functioning in STDBY and the FLT-GRD switch is placed in the FLT position, the controller will try to maintain the cabin pressure at the cabin altitude control setting. When the FLT-GRD switch is placed in the GRD position and the controller is in the ground mode of operation while functioning in either AUTO or STDBY, the controller output signal will open the outflow valve at the rate required to depressurize the airplane at rate limit.
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G. The operational modes are as follows:
MODE SELECTOR POSITION  FLT-GRD SW POSITION  RESULTS 
AC MAN  GRD or FLT  AC actuator drives outflow valve. Valve movement will be continuous as long as toggle is applied. 
DC MAN  GRD or FLT  DC actuator drives valve. Valve movement will be continuous as long as toggle is applied. 
STBY  GRD (Airplane on ground) FLT  DC actuator drives valve. Pressure controller signals actuator to drive valve full open. DC actuator drives valve. Pressure controller signals actuator to maintain selected cabin pressure. Cabin pressure changes at selected rate. 
AUTO  GRD (Airplane on ground)  FLT (Airplane on ground)  FLT (Airplane airborne)  AC actuator drives valve. Pressure controller signals ac actuator to drive valve full open. AC actuator drives valve. Pressure controller signals ac actuator to modulate valve for 0.1-psi pressurization. AC actuator drives valve. Pressure controller signals ac actuator to modulate valve to achieve cabin pressure computed and scheduled by the pressure controller. 

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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

H. The characteristics of the pressurization control system in the event of a power loss and restoration are as follows:
POWER LOSS  EFFECT ON OUTFLOW VALVE  SYSTEM INDICATION  SYSTEM AVAILABLE  POWER RESTORED 
AUTO MODE AUTO AC for up to 12.0 seconds AUTO AC for 14.9 +3.0 seconds *[2] AUTO DC Total power Loss Total power loss except MAN DC  Valve locked in last position by ac actuator *[1] None *[3] Outflow valve response is sluggish and valve may go to closed. Valve locked in last position by ac actuator *[1] Valve locked in last position by dc actuator *[1]  AUTO FAIL, AIR COND and MASTER CAUTION lights come on AUTO FAIL, STANDBY AIR COND and MASTER CAUTION lights come on AUTO FAIL, STANDBY AIR COND and MASTER CAUTION lights may come on AUTO FAIL, STANDBY, AIR COND and MASTER CAUTION lights come on AUTO FAIL, STANDBY, AIR COND and MASTER CAUTION lights come on  STBY, MAN AC, MAN DC STBY, MAN AC, MAN DC STBY, MAN AC, MAN DC None MAN DC  3 seconds after power is restored system returns to AUTO. Lights go out. System still in STANDBY. Place mode selector switch to STBY then to AUTO. AUTO FAIL and STANDBY lights will go out. System returns to normal. 3 seconds after power is restored system returns to AUTO. AUTO FAIL and STANDBY lights go out. 3 seconds after power is restored and system returns to AUTO. AUTO FAIL and STANDBY lights go out. 

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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

POWER LOSS  EFFECT ON OUTFLOW VALVE  SYSTEM INDICATION  SYSTEM AVAILABLE  POWER RESTORED 
STBY MODE MAN DC STANDBY AC STANDBY DC AUTO AC AUTO DC Total power loss Total power loss except MAN DC  Valve locked in last position by ac actuator Valve locked in last position by dc actuator *[1] None None None Valve locked in last position by ac actuator Valve locked in last position by dc actuator  Cabin pressure may drift from altitude selected Cabin pressure may drift from altitude selected None None None AUTO FAIL, AIR COND and MASTER CAUTION lights come on AUTO FAIL, AIR COND and MASTER CAUTION lights come on  AUTO, MAN AC AUTO, MAN AC, MAN DC AUTO, MAN AC, MAN DC MAN AC, MAN DC MAN AC, MAN DC None MAN DC  System returns to STBY System returns to STBY No effect on STBY No effect on STBY No effect on STBY System returns to STBY. AUTO FAIL light goes out. System returns to STBY. AUTO FAIL light goes out. 

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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

POWER  LOSS  EFFECT ON OUTFLOW VALVE  SYSTEM INDICATION  SYSTEM AVAILABLE  POWER RESTORED 
　
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