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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

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.

대표청구항 ▼

An excessive descent-rate warning system particularly useful for helicopter aircraft, characterized in that it includes means for measuring the aircraft altitude and for producing an altitude signal corresponding thereto; means for differentiating the altitude signal and for producing a descent-rate

An excessive descent-rate warning system particularly useful for helicopter aircraft, characterized in that it includes means for measuring the aircraft altitude and for producing an altitude signal corresponding thereto; means for differentiating the altitude signal and for producing a descent-rate signal corresponding to the rate of change of the altitude signal; comparator means for comparing the altitude and descent-rate signals and 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; means for measuring the forward speed of the aircraft and for producing a forward-speed signal corresponding thereto; and forward-speed controlled means for causing an increase in said forward-speed signal to reduce said offset and thereby to decrease the maximum descent-rate at “0”altitude which produces said warning signal; said forward-speed controlled means including a sensitivity selector presettable by the pilot to permit him to preset the rate at which said latter means will reduce said offset.