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AV RACK FAN FAIL (advisory for avionics rack fan failure)
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AV FANS FAIL (advisory if both fans fail in flight) In the case of a failure, the avionics exhaust fan is automatically powered OFF by its converter. The converter tries to restart the fan by automatic reset (up to three times), then if failure is still
detected, it will shut off the fan and post a message on EICAS.
In case of a fan underspeed failure detected by the converter, a fault signal is provided to CAIMS,
but the fan remains running.
NOTE
Check limits on ground operation with failed Avionics fan and ECS OFF. Maximum operating time of 30 minutes at 35 °C.
Auxiliary Pressurization
The auxiliary pressurization system provides an alternative pressurization source for the cabin, in the event of loss of both cooling packs.
The AUX PRESS switch, when selected ON, sends a signal to each ACSC. The ACSC commands the HASOVs to mid position and the trim valves to full open, for use of trim air, for pressurization.
The recirculation system should be selected ON, to reduce the supply temperatures in the distribution ducts. Duct overheat detection is carried out by the ACSCs.
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
An EICAS message is displayed when AUX PRESS switch is selected.
GF0210_043
Humidifier System (Option)
The humidifier system provides additional humidity to the aircraft cabin compartments during high altitude cruise. The humidity is provided directly to the Environment Control System (ECS) mix manifold and then supplied to the cabin compartments via the ECS distribution ducting. The humidifier system is comprised of the following main components:
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Humidifier water boiler assembly (HWB);
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humidifier trim air valve (TAV-H);
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humidifier water shutoff valve (HWSOV);
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humidifier water feed valve (HWFV);
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humidifier drain valve (HDV);
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humidifier cabin humidity sensor (HCHS); and
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humidifier control unit (HCU).
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
TO AFT TO TO FWD
LEGEND
CABIN COCKPIT CABIN
FROM RIGHT ENGINE BLEED
FROM LEFT ENGINE BLEED
GF0210_088
Water is taken form the potable water system and routed to the boiler via 2 normally closed valves. When the system is activated, the Humidifer Control Unit (HCU) will open both valves to replenish the boiler. Trim air is used to heat the boiler. The generated steam is then supplied to the ECS mix manifold. A humidity sensor (HCHS) is installed in the aft cabin to monitor the temperature and moisture level. The reading from the sensor is feed to the HCU to determine the amount of steam needed to bring the humidity level within the acceptable range. The amount of steam generated by the boiler is controlled by the humidifier Trim Air Valve (TAV.H). The TAV.H modulates the air flow that reaches the boiler thus affecting the amount of steam generated. A restrictor is added to limit the maximum amount of trim air supplied to the boiler.
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