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• 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
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−47
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 9002 thru 9158 not incorporating Service Bulletin:
• SB 700−21−034, 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 climb of 540 ft/min with CPC Rate at
HIGH. The rate of climb will be limited to 500 ft/min with CPC Rate at NORM.
CABIN
ALTITUDE
CABIN RATE
OF DESCENT
(300 FT/MIN)
LANDING
ELEVATION
GF0210_055a
CRUISE ALTITUDE
AIRPLANE ALTITUDE
CABIN RATE
OF CLIMB
• Descent − The nominal rate of descent is limited to −300 ft/min. In case of high speed
descent. In case of high speed descent with CPC Rate at HIGH, 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.
• Between the above values the cabin rate of change is proportional to airplane vertical
speed.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−48
MODES OF OPERATION (CONT'D)
Landing Sequence at Field Elevation greater than 5,670 Feet
NOTE
This sequence is not active during manual pressurization operation.
This sequence does not require additional crew action, if the actual landing field elevation was
selected prior to take-off. The scheduled cabin pressure is normally limited to 5,670 feet during
cruise and then automatically reset to the landing field elevation as airplane is descending for
landing.
41,000 feet
CABIN ALTITUDE
5,670 Feet
LANDING ELEVATION 11,000 feet
Landing Elevation 11,000 feet
Example:
CAUTION
WARNING
9,000 feet
8,200 feet
12,470 feet
11,670 feet
10,700 feet
GF0210_056b
CAB ALT LEVEL HI
CABIN ALTITUDE
AIRPLANE ALTITUDE
7,330 feet
The CABIN ALT caution (cabin altitude exceeds limits) is normally set for 8,200 feet and
theCABIN ALT warning is set for 9,000 feet. When the airplane altitude decreases below 41,000
feet, with landing elevation selected to 7,230 feet or higher, the CABIN ALT caution and CABIN
ALT warning start to increase proportionally to the airplane altitude. The CABIN ALT caution is
active up to 1,000 feet above landing field elevation and the CABIN ALT warning up to 1,800 feet
　
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