Excessive descent-rate warning system particularly useful for he

Details Excessive descent-rate warning system particularly useful for he Excessive descent-rate warning system particularly useful for he

1979-09-11

1981-10-06

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

73178H, 244 1713, 340 27SS, 364433, G08B 2100, G01C 500

Patent

active

042938406

ABSTRACT:
In an excessive descent-rate warning systems particularly useful for helicopters, a descent-rate signal is produced corresponding to the rate of change of altitude, and is used for producing a warning signal whenever the descent-rate exceeds the maximum one for the respective altitude according to a predetermined relationship which relationship includes an offset value defining the maximum descent rate at "0" altitude. An increase in the forward-speed of the aircraft is used to reduce the offset in the above predetermined relationship, and thereby to decrease the maximum descent rate at "0" altitude producing the warning signal. A described system may be operated according to a "Take-Off Mode" effective upon take-off to cause a warning signal to be produced upon any descent of the aircraft until it reaches a preselected altitude, at which time the system is automatically actuated to operate according to the above-described Flight Mode.

REFERENCES:
patent: 3936796 (1976-02-01), Bateman
patent: 3947810 (1976-03-01), Bateman et al.
patent: 3979717 (1976-09-01), Barnum et al.
patent: 4115755 (1978-09-01), Cotton
patent: 4189777 (1980-02-01), Kuntman

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