Aircraft altitude annunciator

Details Aircraft altitude annunciator Aircraft altitude annunciator

1976-10-18

1978-06-06

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340 27AT, 340181, 340221, 360 12, G08G 500

Patent

active

040939383

ABSTRACT:
There is disclosed an improved annunciator for verbalizing altitude-related messages during the descent of an aircraft. In the past, announcements such as "nine hundred," "eight hundred," etc. were made when the aircraft crossed a respective "hundreds" level. During circle-to-land maneuvers multiple announcements of the same level sometimes occurred, primarily due to small terrain variations which in effect caused the aircraft altitude to vary above and below a "hundreds" level. In accordance with the invention, the annunciator is enabled following a previous announcement only if the aircraft first passes through a mid-"hundreds" level, e.g., 750 feet. Terrain variations are usually no more than twenty feet or so; thus multiple announcements of the same level are inhibited.

REFERENCES:
patent: 3538264 (1970-11-01), Van Dyke
patent: 3668621 (1972-06-01), Boyd
patent: 3715718 (1973-02-01), Astengo
patent: 3925751 (1975-12-01), Bateman et al.
patent: 3936796 (1976-02-01), Bateman
patent: 3988713 (1976-10-01), Bateman

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