Diagnostics in ground proximity warning systems

Details Diagnostics in ground proximity warning systems Diagnostics in ground proximity warning systems

G - Physics

01

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343/1

G01S 13/94 (2006.01) G01C 5/00 (2006.01) G01S 13/86 (2006.01) G01S 13/91 (2006.01) G05D 1/06 (2006.01)

Patent

CA 1145014

PHF 76560 25.5.77 ABSTRACT: In a ground proximity warning system used in aircraft to warn of the proximity of dangerous terrain conditions by reference to specified flight warning mode envelopes, an automatic diagnostic sys- tem is used to monitor system errors, particularly in the acquisition channels for analog input para- meters HR, HB and GS which are monitored continuous- ly at all altitudes. The diagnostic system substitutes test values for the said parameters which are com- pared against stored reference values, the results being displayed in diagnostic form after filtering by a time constant which takes into account the ef- fects of transient errors. In addition to diagnos- ties visually displayed both on the front panel of the system and in the cockpit of the aircraft in a manner which defines non-operational parameters and flight warning modes, back-up diagnostics in the form of crew initiated audio test sequences are provided. -31-

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