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Avionics Cooling System
The underfloor avionics bay is cooled by a combination of cockpit exhaust air and a portion of the cold air output from each pack. Adaptive flight displays (AFDs) and instruments in the flight compartment instrument panel, control panels, and display units in the center pedestal, and some of the electronic units in the underfloor avionics bay (e.g. IRUs, DCUs) are cooled with recirculated air from their integral fans. In addition, an automatic cooling system, with its own fan, draws hot air from behind the flight compartment instrument panel and exhausts it under the copilot’s seat area. All fans activate automatically when AC power is applied to the airplane.
If the avionics cooling fan drops to less than 60% of its rated speed when cooling is demanded, a DISPLAY FAN FAIL status EICAS message will be displayed. This message extinguishes when fan speed recovers, or when cooling is no longer demanded.
Ram Air Valve
If both packs are inoperative (unpressurized flight), the ram air valve can be opened to allow air from the ram air scoop to enter the mixing manifold and ventilate the cockpit and the passenger cabin. The ram air valve is controlled by the RAM-AIR switch/light located on the AIR CONDITIONING panel. The white OPEN legend will illuminate when the valve is opened.
NOTE
An airspeed of 250 KIAS is recommended during cruise to provide sufficient airflow to passengers within the cabin.
PRESSURIZATION SYSTEM
Description
Cabin pressurization is achieved by controlling the leakage rate, or outflow, of aircraft cabin air through two outflow valves. The outflow valves are located on the aft pressure bulkhead, and are normally controlled by the cabin pressure controller (CPC).
During normal operation, the pressurization system automatically maintains cabin pressure through all phases of flight. The flight crew only needs to set the landing field elevation and baro-correction input. Controls are provided on the CABIN PRESSURIZATION panel, and indications are on the EICAS page and SUMMARY page.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.10
Oct 05/06
Components and Operation
Cabin Pressure Acquisition Module
The cabin pressure acquisition module (CPAM) provides the data concentrator units (DCUs) with pressurization data for display on the EICAS.
EICAS indications include:
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Cabin altitude (ALT);
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Cabin rate of climb or descent (RATE); and
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Differential pressure (.P).
The CPAM also provides the DCUs with data to generate the following EICAS messages:
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CABIN ALT caution message when cabin altitude between 8,500 and 10,000 ft;
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CABIN ALT warning message when cabin altitude exceeds: 10,000 ft during low-altitude airfield operation, or 14,000 ft during high-altitude airfield operation;
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