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exhaust fan. The fan is mounted at the rear of the under floor avionics bay and is oriented to direct
its exhaust directly through ducts towards the forward outflow valve.
The avionics rack is ventilated by an avionics rack fan that blows air through supply piccolo tubes.
The avionics exhaust fan extracts air from the sealed avionics rack through extraction piccolo
tubes connected to the exhaust ducting.
Main
Door
AVIONICS EQUIPMENT
AVIONICS EXHAUST
FAN
DISPLAY UNITS
FORWARD OUTFLOW
VALVE
FGF0210_005
UNDER FLOOR
AVIONICS
RACK FAN
AVIONICS
RACK
The avionics rack and exhaust fans can run at two speeds, high or low and are controlled by the
ACSCs. The ACSCs exchange fan status with each other. If one fan fails the ACSCs will cause
the operative fan to run at high speed. The avionics rack fan is controlled by ACSC 1, the avionics
exhaust fan by ACSC 2.
The fans are driven at high speed when one fan has failed, or the cockpit (ventilated) temperature
exceeds 27°C.
The fans are driven at low speed when cockpit (ventilated) temperature equals 27°C or below and
both fans are running.
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−33
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Avionics and Cockpit Display Ventilation (Cont’d)
Fan failure signals are created by the avionics rack fan itself or, for the avionics exhaust fan, by its
converter. The following EICAS messages are generated:
• AV FANS FAIL (caution if both fans fail on ground).
• AVIONIC FAN FAIL (advisory for avionics exhaust fan failure)
• AV RACK FAN FAIL (advisory for avionics rack fan failure)
• 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.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−34
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Auxiliary Pressurization (Cont’d)
An EICAS message is displayed when AUX PRESS switch is selected.
GF0210_043
BLEED BLEED
RAM AIR
23 °C 23 °C 23 °C
10 °C
TRIM AIR
10 °C
R PACK
AUX PRESS ON
L PACK
AUX PRESS ON
AUX PRESS
ON
AUX PRESS
ON
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:
• Humidifier water boiler assembly (HWB);
• humidifier trim air valve (TAV-H);
• humidifier water shutoff valve (HWSOV);
• humidifier water feed valve (HWFV);
• humidifier drain valve (HDV);
• humidifier cabin humidity sensor (HCHS); and
• humidifier control unit (HCU).
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−35
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Humidifier System (Option) (Cont’d)
GF0210_088
POTABLE
WATER
SYSTEM
HWSOV
HWFV
HDV
HWB
TO AIRPLANE
WATER DRAIN
TO AFT
CABIN
TO
COCKPIT
TO FWD
CABIN
FROM LEFT
AIR−CONDITIONING
PACK
FROM RIGHT
AIR−CONDITIONING
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