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in case of an aborted flight and emergency return to the departure airport.
When the LGECU indicates the airplane is no longer Weight on Wheels, the automatic take-off
sequence is initiated.
During this sequence, in primary mode:
• When the airplane vertical speed is ≥−500 ft/min, the scheduled cabin pressure is equal to
the lowest value between theoretical pressure and destination landing pressure.
• When the airplane vertical speed is <−500 ft/min (aborted take-off), the sequence switches
over to secondary mode (without FMS) and the cabin pressure is controlled with nominal
rate change (500 ft/min to −300 ft/min sea level) towards the scheduled cabin pressure
value of the pre-pressurization sequence.
ABORTED
TAKE−OFF
MEMORIZED
TAKE−OFF ALTITUDE
CABIN ALTITUDE
SCHEDULED
CRUISE ALTITUDE
CABIN
CRUISE ALTITUDE
TAKE−OFF SEQUENCE
( 10 minutes at the latest )
AIRPLANE ALTITUDE
GF0210_050
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−43
MODES OF OPERATION (CONT'D)
Take-Off Sequence (Cont’d)
During this sequence, in secondary mode:
• The scheduled cabin pressure remains constant, equal to the scheduled cabin pressure of
the pre-pressurization sequence for 10 minutes or as long as scheduled cabin pressure is
lower than the theoretical cabin pressure.
GF0210_051
ALTITUDE
AIRPLANE
ABORTED
MEMORIZED TAKE−OFF
TAKE−OFF ALTITUDE
CABIN ALTITUDE
CRUISE ALTITUDE
CABIN
CRUISE ALTITUDE
TAKE−OFF SEQUENCE
( 10 minutes at the latest )
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−44
MODES OF OPERATION (CONT'D)
Flight Sequences with FMS (Primary Mode)
When the LGECU indicates that the airplane is in flight, the flight sequence with FMS (primary
mode) is initiated (except during the take-off sequence).
50000
40000
30000
20000
10000
0
−2000
0 2 4 6 8 10 12 14 16 18 20
GF0210_052c
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−45
MODES OF OPERATION (CONT'D)
Flight Sequences with FMS (Primary Mode) (Cont’d)
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.
50000
40000
30000
20000
10000
0
−2000
0 2 4 6 8 10 12 14 16 18 20
GF0210_052b
During this sequence, in primary mode:
• Climb − This sequence is active as long as cabin pressure is lower than the theoretical cabin
pressure. The scheduled cabin pressure takes the lowest value between theoretical cabin
pressure, destination landing pressure plus −300 ft, plus barometric correction. Theoretical
cabin pressure is computed from the airplane altitude cruise flight level, received from FMS.
With CPC Rate at NORM, the rate of climb is limited to 500 fpm.
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
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−46
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 fpm.
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.
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