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TO ACSC
SCAVENGE AIR LINE TO RAM AIR OUTLET DUCT TO TRIM AND AUXILIARY PRESSURIZATION SYSTEM
TO ACSC
GF0210_022
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
Flow selections are as follows:
NORM:
The flow demand per pack decreases linearly with airplane altitude from 30 lb/min at sea level to 18 lb/min at 51,000 feet. Flow is limited to a maximum value of 40lb/min per pack. The BMC will prevent two packs being supplied by one engine. In case of single pack operation, the high flow schedule is automatically selected by the ACSC.
HIGH:
The flow demand per pack decreases linearly with airplane altitude, from 40 lb/min at sea level to 23 lb/min at 51,000 feet (controlled by ACSC).
LO:
The flow demand is half, 20 lb/min, of the high flow demand but is limited to a minimum of 18 lb/min (controlled by the ACSC).
MAN:
The flow control valve is driven to the full open position (ACSC is disabled).
GF0210_023
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
An alternate supply of fresh air is available via the ram air system and has been designed for use inflight at an altitude of 15,000 feet or less.
The ram air system is picked up at the ram air inlet at the base of the vertical fin and is used primarily to provide cooling for the heat exchangers of the cooling packs.
The ram air valve is closed in normal operations. It can be switched ON manually by means of a guarded switch on the BLEED/AIR COND panel. The ram air valve is opened for unpressurized flight operations below 15,000 feet.
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
In normal operation, with the packs in AUTO mode and trim system ON, the pack discharge temperature is automatically controlled by the ACSC.
Each ACSC is divided into two fully redundant channels A and B. During flight, only one channel is active and controls the ECS. The inactive channel also computes the control data but does not command outputs.
ACSC 1 controls the temperature in the cabin (forward and aft trim air valves) and ACSC 2 controls the temperature of the cockpit (cockpit trim air valve).
DC BUS2
DC BUS1
DC BUS2
DC BUS1
DC ESS
DC ESS
FGF0210_002
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
The temperature selectors, when selected COLD will cause the ACSC to modulate the TRIM AIR valves towards closed and when selected HOT will cause the ACSC to modulate the TRIM AIR valves towards open. The affected compartment trim valve will modulate to attain and maintain the selected temperature.
The selected temperature and actual temperature will be displayed on the SYSTEMS page and AIR CONDITIONING synoptic page.
Actual Temperature Selected Temperature
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
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