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climb rate and cabin altitude.
• To decrease cabin altitude, select MAN/ALT toggle switch to DN momentarily and monitor
descent rate and cabin altitude.
• To maintain cabin altitude, select MAN/ALT toggle switch to mid position, when reaching
target cabin altitude (see the chart below).
Cruise Flight
Level
180 200 220 240 260 280 290 310 330
Target Cabin
Altitude
600 800 1000 1200 1400 1700 1900 2200 2400
Target Δ P 7.05 7.55 8.00 8.40 8.75 9.05 9.20 9.40 9.65
Cruise Flight
Level
350 370 390 410 430 450 470 490 510
Target Cabin
Altitude
2700 2900 3300 3700 4100 4500 4900 5300 5700
Target Δ P 9.90 10.05 10.20 10.25 10.30 10.30 10.30 10.30 10.30
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−59
MODES OF OPERATION (CONT'D)
Manual Mode Operation (Cont’d)
Effectivity:
• Airplanes 9127 thru 9158 not incorporating Service Bulletin:
• SB 700−1A11−21−004, Modification − Pressurization Control − Cabin Altitude Reduction
During Flight for Improved Passenger Comfort.
Cruise Flight
Level
180 200 220 240 260 280 290 310 330
Target Cabin
Altitude
1100 1400 1600 1900 2200 2600 2800 3100 3400
Target Δ P 6.75 7.20 7.65 8.00 8.35 8.60 8.70 8.95 9.15
Cruise Flight
Level
350 370 390 410 430 450 470 490 510
Target Cabin
Altitude
3800 4100 4500 5000 5500 6000 6400 6900 7200
Target Δ P 9.35 9.50 9.60 9.60 9.60 9.60 9.60 9.60 9.60
• During descent, select MAN/ALT toggle switch adjust Up or DN to achieve landing elevation.
After landing, select MAN/ALT toggle switch to mid position, to maintain landing elevation.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−60
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
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−61
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. 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.
Effectivity:
• Airplanes 9127 thru 9158 not incorporating Service Bulletin:
• SB 700−1A11−21−004, Modification − Pressurization Control − Cabin Altitude Reduction
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