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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 normal differential pressure (9.64 psi) 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 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. when the
airplane climbs at maximum performance at minimum weight. The cabin rate of
climb is automatically limited to:
• 500 ft/min if airplane vertical speed is < 2300 ft/min
• 540 ft/min if airplane vertical speed is > 6000 ft/min
• Between the above values the cabin rate of change is proportional to aircraft
vertical speed.
An automatic rate of climb increase is active if vertical speed is less than 500 ft/min
for more than 10 seconds.
Cabin Rate
of Descent
(300FT/MIN)
Cabin
Altitude
Airplane
Altitude
Cabin Rate
Of Climb
Cruise Altitude
Landing
Elevation
GX_13_052
For Training Purposes Only
Sept 04
13-51
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
• Descent - The nominal rate of descent is limited to -500 ft/min and the rate is
proportional to the airplane rate of descent. In case of high speed descent, 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 if high rate selected
• Between the above values the cabin rate of change is proportional to airplane
vertical speed
LANDING SEQUENCE AT FIELD ELEVATION GREATER THAN 7,230
FEET
This sequence does not require additional crew action if the actual landing field
elevation was selected prior to takeoff. The scheduled cabin pressure is normally
limited to 7,230 feet during flight and then automatically reset to the landing field
elevation.
The CABIN ALT caution (cabin altitude exceeds limits) is normally set for 8,200 feet
and the CABIN ALT warning is set for 9,000 feet. When the airplane altitude
decreases below 41,000 feet, the CABIN ALT caution and warning start to increase
proportionally to the airplane altitude. The CABIN ALT caution and CABIN ALT
warning altitudes will increase 1,000 feet and 1,800 feet respectively, above the
landing field elevation. Both CABIN ALT caution and warning are limited to
14,500 feet. An advisory message is displayed on EICAS informing the crew that the
warning and caution limits have been reset.
Warning
Caution
Cabin Altitude
9,000 feet
8,200 feet
7,230 feet
Airplane Altitude 41,000 feet
12,800 feet
12,000 feet
Landing Elevation
11,000 ft
10,700 feet
Cabin Altitude
Example:
Landing Elevation 11,000 feet
GX_13_053
CAB ALT LEV HI
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-52 For Training Purposes Only
Sept 04
LEVELING OFF DURING DESCENT
If a leveling off occurs above 41,000 feet during descent, the cabin remains at
7,230 feet. If leveling off occurs at or below 25,000 feet during descent, the cabin
remains at current altitude. If leveling off occurs between 41,000 and 25,000 feet, the
cabin altitude will remain at the current altitude for 3 minutes.
If the leveling off lasts for more than 3 minutes, the cabin altitude will descend at a
rate of 300 ft/min until descent is initiated.
Warning
Caution
Cabin Altitude
9,000 feet
8,200 feet
7,230 feet
Airplane Altitude 41,000 feet 12,800 feet
12,000 feet
Landing Elevation
11,000 ft
10,700 feet
Cabin Altitude
Less than 3 minutes
Example:
Less than 3 minutes
GX_13_054
Warning
Caution
Cabin Altitude
9,000 feet
8,200 feet
7,230 feet
Airplane Altitude 41,000 feet
　
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