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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 CABIN ALT
15,000
0.0
3000
1000
CAB ALT
P
CAB RATE
LDG ELEV
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
50% 50%
OPEN OPEN
OUTFLOW VALVES
1 2
6500
7.74
500
1000
CAB ALT
P
CAB RATE
LDG ELEV
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
0% 0%
OPEN OPEN
OUTFLOW VALVES
1 2
DITCHING ON
L−R PACK OFF
OUTFLOW VLV 1−2 CLSD
DITCHING
ON
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−62
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
0% 0%
OPEN OPEN
OUTFLOW VALVES
1 2
EMER DEPRESS
L−R PACK OFF
OUTFLOW VLV 1−2 CLSD
R PACK
OFF
FAIL
L PACK
OFF
FAIL
OUTFLOW VALVE
CLOSED
1
CLOSED
2
DEPRESS
ON
EMER
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
0% 0%
OPEN OPEN
OUTFLOW VALVES
1 2
EMER DEPRESS
L−R PACK OFF
14,800
7.74
5000
1000
CAB ALT
P
CAB RATE
LDG ELEV
DEPRESS
ON
EMER
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.
GF0210_081
0% 13%
OPEN OPEN
OUTFLOW VALVES
1 2
OUTFLOW VLV 1 CLSD
OUTFLOW VALVE
CLOSED
1
CLOSED
2
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−63
SYSTEM SAFETIES (CONT'D)
Door Open Protection
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.
GF0210_082
100% 100%
OPEN OPEN
OUTFLOW VALVES
1 2
PASSENGER DOOR
• If one pack is OFF, one OFV is driven close with preference to aft OFV over forward OFV
(i.e. if forward OFV is already closed, the aft OFV will not then be driven close). GF0210_083
0% 100%
OPEN OPEN
OUTFLOW VALVES
1 2
PASSENGER DOOR
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−64
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