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How does the ASCPC control the cabin pressurization?

April 26, 2017cabin CONTROL pressurization

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How does the ASCPC control the cabin pressurization?

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10 Posted

: data is sent to the ASCPC to calculate pressurization schedule from the FMC CRZ ALT, time to climb, T/D, time to descent, LDG ALT, ambient & cabin pressure. During T.O: ASCPC start to close the outflow valves. After T.O: the system goes to FLT mode. During climb: ASCPC uses average cabin rate based on T.O elevation, CRZ ALT, time to climb. Cruise: ASCPC goes to CRZ mode when time to climb becomes 0. Descend: At T/D the ASCPC calculate cabin rate of descent, LDG elevation, time to descend, and barometric correction (target descend set to 190 ft below LDG elevation).