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During Flight for Improved Passenger Comfort.
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 positive differential pressure is controlled at
10.02 psi. At 9.92 ± 0.1 psi, the safety valve opens, and at 10.15 psi CABIN DELTA P will be
displayed on EICAS and the digital readout on the STAT page will appear red.
GF0210_074
CABIN DELTA P
1300
10.12
800
1000
CAB ALT
P
CAB RATE
LDG ELEV SAFETY VALVE OPEN
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
CABIN DELTA P
1300
−0.5
800
1000
CAB ALT
P
CAB RATE
LDG ELEV SAFETY VALVE OPEN
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−62
SYSTEM SAFETIES (CONT'D)
Cabin Altitude Limitation
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.
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
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−63
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.
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