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The purpose of automatic pre-pressurization is to avoid cabin “bump” at take-off.
When the LGECU indicates an airplane weight on wheels condition and both thrust lever angles
are higher than 20°, the pre-pressurization sequence is initiated.
During this sequence:
• The scheduled cabin pressure is equal to the last measured cabin value (take-off
memorization), before the engine FADEC gives the “take-off power” position.
• The reference cabin pressure moves by computation towards the scheduled cabin pressure
with a pressure rate limit change equal to −300 ft/min.
In case of take-off with air conditioning packs operating, cabin pressurization is controlled with a
pressure rate equal to −300 ft/min limited to a cabin pressure of 300 S. L. feet below airfield.
ALTITUDE
MIN TAKE−OFF
POWER
CABIN RATE
−300 FT/MIN
TAKE−OFF MEMORIZATION
60 SECONDS
−300 FEET TIME
CABIN ALTITUDE
GF0210_049
In case of take-off without packs, this sequence will close both outflow valves.
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−43
MODES OF OPERATION (CONT'D)
Take-Off Sequence
The purpose of this sequence is to avoid the requirement to manually re-select the landing altitude
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
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−44
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
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−45
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
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−46
MODES OF OPERATION (CONT'D)
Flight Sequences with FMS (Primary Mode) (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.
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.
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