Mode indication system

Patent

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Details

B64D 1300

Patent

active

041648951

ABSTRACT:
A cabin pressure control system has two independent controllers, one of which is the primary controller and the other the standby controller taking control in case of primary controller malfunction. The controllers switch roles automatically each flight. An annunciating system indicates the identity of the primary controller on the previous flight and maintains the designation in case of malfunction so that a defective unit may be readily identified.

REFERENCES:
patent: 2851254 (1958-09-01), Messinger et al.
patent: 2966109 (1960-12-01), Best
patent: 3192848 (1965-07-01), Townsend
patent: 3215057 (1965-11-01), Turek
patent: 3461790 (1969-08-01), Kinsell et al.
patent: 3473460 (1969-10-01), Emmons
patent: 3711044 (1973-01-01), Matulich

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