飞行翻译_公务机_公务航空_Business Jet_Business Aviation

In case of unannounced system malfunction, operate system with manual control.
Automatic Pre-Pressurization Sequence On Ground
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.

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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

CABIN RATE
.300 FT/MIN

In case of take-off without packs, this sequence will close both outflow valves.
Rev 12, Aug 14, 2006 Flight Crew Operating Manual  Volume 2

AIR CONDITIONING AND PRESSURIZATION

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.

SCHEDULED

Volume 2  Flight Crew Operating Manual Rev 12, Aug 14, 2006

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.
CRUISE ALTITUDE

Rev 12, Aug 14, 2006 Flight Crew Operating Manual  Volume 2

AIR CONDITIONING AND PRESSURIZATION

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
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0 .2000

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