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With CPC RATE at NORM, the rate of climb is limited to 500 ft/min.
With CPC RATE at HIGH, the rate of climb is automatically limited to:
• 540 ft/min if airplane vertical speed is <2300 ft/min.
• 800 ft/min if airplane vertical speed is >6000 ft/min.
• Between the above values the cabin rate of change is proportional to airplane vertical
speed.
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−47
MODES OF OPERATION (CONT'D)
Flight Sequences with FMS (Primary Mode) (Cont’d)
• Descent − This sequence is active as long as the airplane is descending >500 fpm. The
scheduled cabin pressure takes the lowest value between the theoretical cabin pressure and
destination landing pressure −300 ft plus barometric correction.
−300 ft
RATE +500 ft/Min
BOTH OUTFLOW VALVES
FULL OPEN
Time
ALTITUDE
P
AIRPLANE
30Apr97
CABIN ALTITUDE
GF0210_053
DESCENT
With CPC RATE at NORM, the rate of descent is limited to 300 ft/min.
With CPC Rate at HIGH, the rate of descent is automatically limited to:
• −300 ft/min if airplane vertical speed is < −2300 ft/min
• −800 ft/min if airplane vertical speed is > −6000 ft/min.
• Between the above values the cabin rate of change is proportional to airplane vertical
speed.
CABIN RATE
AIRPLANE RATE OF DESCENT
(>−2300 ft / min )
(<−6000 ft /min )
(−300 f t / min)
(−800 ft / min)
GF0210_054
OF DESCENT
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−48
MODES OF OPERATION (CONT'D)
Flight Sequences without FMS (Secondary Mode)
When the LGECU indicates the airplane is in flight, the normal flight sequence is initiated (except
during the take-off sequence).
During this sequence:
• Cabin pressurization is controlled with calculated rates of change according to selected
landing elevation and theoretical cabin altitude schedule.
• The theoretical cabin altitude schedule provides a relation between airplane altitude and
theoretical cabin altitude/pressure by taking into account the maximum climb performance of
the airplane at the minimum airplane weight and the maximum differential pressure (10.33
psid) providing a cabin altitude of 5,670 feet at 51,000 feet. The theoretical schedule is
designed in order to reach the maximum differential pressure at the lowest airplane altitude,
with a minimum cabin rate of climb.
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.
The theoretical cabin altitude schedule provides a relation between airplane altitude and
theoretical cabin altitude/pressure by taking into account the maximum climb performance of
the airplane at the minimum airplane weight and the maximum differential pressure (9.64 psid)
providing a cabin altitude of 7,230 feet at 51,000 feet. The theoretical schedule is designed in
order to reach the maximum differential pressure at the lowest airplane altitude, with a
minimum cabin rate of climb.
The rate of change is automatic during Climb. The rate of climb is directly taken from the
theoretical cabin altitude schedule and the cabin rate of change is proportional to airplane vertical
speed. The rate of climb will be maximized and limited to a climb of 540 ft/min with the CPC RATE
at HIGH. The rate of climb will be limited to 500 ft/min with the CPC RATE at NORM.
CABIN RATE
OF CLIMB
CABIN ALTITUDE
CABIN RATE
OF DESCENT
(300 FT/MIN)
LANDING
ELEVATION
FGF0210_019
CRUISE ALTITUDE
AIRPLANE ALTITUDE
• Descent − The nominal rate of descent is limited to −300 ft/min. In case of high speed
descent, if CPC RATE HIGH is selected, the rate of descent is increased according to the
calculation of the remaining flight time. The remaining flight time is calculated from the
airplane speed received from the ADC. This increased cabin rate of change demand is
automatically limited, according to the airplane vertical speed:
• 300 ft/min if airplane vertical speed is < −2300 ft/min.
• 800 ft/min if airplane vertical speed is > −6000 ft/min.
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
　
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