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This signal isolates the automatic control and the manual control of the OFV and closes the OFV through the manual channel of the OFV, until the cabin altitude drops below 14,500 ± 500 feet.
The cabin altitude limitation function includes a cabin rate limitation of 3,000 ft/min to close the OFV, when the cabin altitude rate exceeds the setting value. The altitude rate limitation is not active in case of Emergency Depressurization and Ditching.
GF0210_076
Outflow Valve Travel Limiter
An OFV travel limiter device is included on each OFV to limit the OFV opening (for differential pressure higher than 7 ± 0.5 psid) to a safe value (maximum 50%) at high altitudes.
When the pressure differential is above 7 ± 0.5 psid, the travel limiter device prevents the OFV opening beyond 50%. The travel limiter will not prevent movement from open to close.
GF0210_077
Ditching
Safety in case of ditching is achieved in both AUTO and MAN modes, ensuring that the cabin is fully depressurized and that the outflow valves are fully closed.
The AUTO sequence is generated from the DITCHING switch selection and the following occurs:
.
PACKS flow shutoff.
.
Cabin is depressurized.
.
OFVs are driven to the closed position.
The AUTO ditching sequence is inhibited above 15,000 feet. The altitude rate limitation is inoperative, whenever DITCHING is selected ON.
When the DITCHING switch is selected ON, the OFVs are displayed on the STAT page and status messages are displayed on EICAS.
GF0210_078
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
SYSTEM SAFETIES (CONT'D) Ditching (Cont’d)
The MAN sequence is:
.
Select PACKS OFF.
.
Select EMER DEPRESS ON.
.
Select both OUTFLOW VLVs CLOSED.
GF0210_079
Emergency Depressurization
When the EMER DEPRESS switch is selected ON, a fast depressurization is performed, in AUTO or MAN mode, by opening both OFVs through the manual drive of the OFVs.
Cabin altitude limitation functions override this function and will not allow the cabin altitude above 14,500 ± 500 feet. The cabin rate of climb limitation is inoperative.
GF0210_080
Close Outflow Valve
The OFVs can be manually closed, both in AUTO and MAN, by selecting the OUTFLOW VLV switch(es) on the Cabin Pressure Control Panel. The OFV is driven to the closed position, through the manual drive of its actuator. The outflow valves’ position will be displayed on the STATUS page and a message is displayed on EICAS.
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
Door open protection, prevents cabin pressurization if the main entrance door is not closed and fully locked.
If the main entrance door is open:
. If both packs are ON, both outflow valves are driven to the open position.
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