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Touch-and-Go Mode
On airplane touchdown, the system will assume landing mode. As the thrust levers are advanced, the system will schedule prepressure mode.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.17
Oct 05/06
Typical Flight Pressurization Profile
Figure 02.10.8
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.18
Oct 05/06
High-Altitude Airfield Mode
The CPC includes a high-altitude airfield mode to support aircraft operation up to a maximum airport pressure altitude of 14,000 feet MSL.
During takeoff and landing at airport pressure altitudes above 8,000 feet, the CPC reduces the time at which cabin altitude exceeds 8,000, feet as explained below:
Operation to a High-Altitude Airfield (Above 8,000 feet)
When a landing field elevation above 8,000 feet is selected, the CPC will schedule cabin altitude versus aircraft altitude as follows:
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Climb phase: After takeoff, the CPC uses 8,000 feet as the control point. With the auto RATE knob selected at the “pip” mark, the cabin rate will climb at a rate of 500 feet per minute up until it reaches 8,000 feet.
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Cruise phase: The CPC maintains the cabin altitude at 8,000 feet.
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Landing phase: When the aircraft is in descent, and aircraft altitude is less than 25,000 feet MSL, the CPC will climb the cabin altitude to the selected landing field elevation at an increased rate (700 feet per minute at the “pip” mark). This altitude is maintained for the remainder of the flight.
Takeoff at Sea Level to Land at 14,000 feet
Figure 02.10.9
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.19
Oct 05/06
Operation from a High-Altitude Airport (Above 8,000 feet)
When departing from an airport above 8,000 feet, the CPC will schedule cabin altitude versus aircraft altitude as follows:
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Climb phase: After takeoff, the CPC immediately sets the cabin altitude control point to 8,000 feet, and descends the cabin altitude at an increased rate (600 feet per minute with the auto RATE knob selected at the “pip” mark) until it reaches 8,000 feet.
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Cruise phase: The cabin altitude remains at 8,000 feet until the aircraft is established in cruise. The CPC then controls the cabin altitude toward the autoschedule control point at the selected rate.
Takeoff at 14,000 feet to Land at Sea Level Figure 02.10.10
Operation From and To a High-Altitude Airport (Above 8,000 feet)
For operation from and to airfields above 8,000 feet, the cabin altitude profile can be obtained by combining Figure 02.10.9 and Figure 02.10.10.
Manual Pressurization Mode
When MANUAL is selected on the CABIN PRESSURIZATION control panel, the outflow valves are manually controlled. The MAN ALT lever and the MAN RATE knob on the CABIN PRESSURIZATION control panel are used to position the outflow valves. An UP selection on the MAN ALT lever will cause an increase in cabin altitude at the rate selected on the MAN RATE knob. A DN selection of the MAN ALT lever will cause the cabin altitude to decrease at the rate set by the MAN RATE knob. When the MAN ALT lever is released, it is spring-loaded to the neutral position, and the cabin altitude will be maintained regardless of changes to the aircraft altitude.
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