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Select MAN/ALT toggle switch to mid position, to maintain landing elevation.
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−59
OUTFLOW VALVES (OFV)
The two electrical OFVs modulate the discharge airflow to control cabin pressure in both AUTO
modes and in the Manual mode.
CABIN PRESSURE
CONTROLLERS
OUTFLOW VALVE #1 OUTFLOW VALVE #2
VALVES
The two OFVs are located:
GF0210_071
SAFETY
In both AUTO modes, the OFV provides its position to the CPC. In Manual mode it provides its
position to the STATUS page.
STATUS
PAGE
CABIN
PRESSURE
CONTROLLER
#1
CABIN
PRESSURE
CONTROLLER
#2
MANUAL
MANUAL
CONTROL
PANEL
LIM
LIM
AUTO 1
AUTO 1
AUTO 2
AUTO 2
MAN
MAN
OUTFLOW
VALVE
#1
OUTFLOW
VALVE
#2
GF0210_072
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.
GF0210_073
SAFETY VALVE OPEN
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−60
SYSTEM SAFETIES
The system safety features incorporated in the CPCS are:
• Dual redundant positive and negative pressure relief valves.
• Dual (segregated) cabin altitude limiters, each dedicated to one outflow valve (OFV).
• An OFV travel limiter on each OFV.
• Automatic Ditching provision.
• Emergency Depressurization provision.
• Two OFV closure override circuitry.
• 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. The differential pressure shall not
exceed 0.1 psi during taxi and 1.0 psi upon initial landing. The maximum positive 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.
Effectivity:
• Airplanes 9002 thru 9158 not incorporating Service Bulletin:
• SB 700−21−034, Modification − Pressurization Control − Cabin Altitude Reduction 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. The differential pressure shall not
exceed 0.1 psi during taxi and 1.0 psi upon initial landing. 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
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−61
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.
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