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To maintain cabin altitude, select MAN/ALT toggle switch to mid position, when reaching target cabin altitude (see the chart below).
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
The two electrical OFVs modulate the discharge airflow to control cabin pressure in both AUTO modes and in the Manual mode.
In both AUTO modes, the OFV provides its position to the CPC. In Manual mode it provides its position to the STATUS page.
CABIN
The two outflow valves operate in a “slave and master” mode. During normal operations, OFV 2 is master on day 1 and 2 in a four day cycle and OFV 1 is master on day 3 and 4 in the same four day cycle.
SAFETY VALVES
The two safety valves (SFV 1 and SFV 2) are located on the aft bulkhead.
Each SFV ensures overpressure relief and negative pressure relief and provides an OPEN position signal to EICAS.
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
The system safety features incorporated in the CPCS are:
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Dual redundant positive and negative pressure relief valves.
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Dual (segregated) cabin altitude limiters, each dedicated to one outflow valve (OFV).
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An OFV travel limiter on each OFV.
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Automatic Ditching provision.
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Emergency Depressurization provision.
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Two OFV closure override circuitry.
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Door Open Protection.
Overpressure Relief
Overpressure relief is ensured pneumatically by each identical SFV and overrides the operation of both AUTO and MAN mode. When maximum differential pressure is reached, an overpressure valve, located on the safety valve, opens to outside pressure. During taxi and takeoff, the pressure differential must not exceed 1.0 psi. During initial landing (at touchdown), the pressure differential must not exceed 1.0 psi. The maximum relief differential pressure is controlled at 10.73 psi. At 10.63± 0.1 psi, the safety valve opens, and at 10.85 psi CABIN DELTA P will be displayed on EICAS and the digital readout on the STAT page will appear red.
GF0210_074
Negative Pressure Relief
Negative pressure relief is ensured pneumatically by each identical SFV and overrides the operation of both AUTO and MAN mode. During an emergency descent, without cabin airflow, when the outside pressure becomes slightly greater than cabin pressure, the SFV opens to control negative pressure at a value lower than or equal to . 0.5 psid. A warning message will be displayed on EICAS and the digital readout on the STAT page will appear red.
GF0210_075
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
The cabin altitude limiters override the operation of both AUTO and MAN mode. Two cabin altitude limiters are provided, one for each OFV. When the cabin altitude reaches 14,500 ± 500 feet, the cabin altitude limiter signal is active.
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