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CABIN PRESSURIZATION Panel
Figure 02.10.7
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.15
Oct 05/06
Cabin Pressurization Operation
The normal operating mode is automatic, where cabin altitude is maintained at a control value determined by the CPC, from the highest of the destination airport elevation or the cabin pressure schedule. Each flight segment has an automatic operating mode as explained below.
The alternative mode of operation is manual, where the crew manually selects and controls cabin altitude.
Ground Mode
The ground mode drives both outflow valves fully open, to provide maximum ventilation on the ground.
Prepressure Mode
The prepressurization mode is activated when thrust levers are advanced to takeoff when the aircraft is on the ground. Prepressurizing the aircraft allows the outflow valves to achieve a controlling position prior to takeoff. This eliminates any noticeable pressure bumps. The cabin is pressurized between –150 to –200 feet below airfield elevation at the selected rate limit (approximately 300 feet per minute at the “pip” mark (▼)).
Takeoff Abort Mode
The takeoff abort mode is entered when the thrust levers are retarded during a rejected takeoff. The cabin altitude climbs back to field elevation at 500 feet per minute for 20 seconds, then the outflow valves are driven fully open. Ground mode is then re-established.
Flight Mode
Flight mode is entered when the CPC receives a weight-off-wheels signal from the PSEU. A fixed schedule of cabin altitude versus aircraft altitude is used to establish cabin pressurization. The CPC selects whichever is higher, selected landing field elevation or fixed schedule, as the control value, then either maintains or drives cabin altitude toward this control value.
With the auto RATE knob selected at the “pip” mark , the cabin rate will climb at a rate of 500 feet per minute up, or descend at a rate of 300 feet per minute down.
Should pressure of the fuselage reduce to –0.5 psid, the outflow valves will automatically open to equalize the pressure.
Flight Abort Mode
The flight abort mode is set by the CPC when:
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Less than 10 minutes have elapsed since takeoff;
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Aircraft has climbed less than 6,000 feet; and
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Descent is detected by the CPC (aircraft descends by more than 1,000 feet from its maximum altitude).
When the CPC sets the flight abort mode, it automatically drives the cabin altitude to takeoff field elevation at the selected up/down rate.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.16
Oct 05/06
Landing Mode
The landing mode is entered when the CPC receives a weight-on-wheels signal from the PSEU, and the thrust levers are at idle. The cabin altitude is driven up at the selected rate for 60 seconds, and then the CPC reverts to ground mode (outflow valves are driven fully open).
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