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