Communications: electrical – Aircraft alarm or indicating systems – Flight alarm
Patent
1997-04-29
1998-07-14
Hofsass, Jeffery A.
Communications: electrical
Aircraft alarm or indicating systems
Flight alarm
340945, 340946, 340977, 73178H, 73178T, 244 1711, 701 4, 701 5, G08B 2300
Patent
active
057811261
ABSTRACT:
The present invention provides ground proximity warning system and method for aircraft, particularly rotary wing aircraft such as helicopters. The warning system generally includes a barometric altitude rate detector, such an altimeter and a rate circuit, disposed to detect the rate of change of the barometric altitude of the aircraft. A controller is coupled to the detector for receiving the barometric altitude rate signals and adjusting the signals based on the ground effect from the main rotors when the aircraft is near the ground. Typically, the controller decreases the barometric altitude rate signals to compensate for the apparent increase in barometric altitude rate caused by ground effects. This reduces the number of nuisance warnings that may otherwise occur during takeoffs, landings or other low altitude flight conditions.
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Loos Alden L.
Ostrom Gary A.
Paterson Noel S.
Allied-Signal Inc.
Hofsass Jeffery A.
Lee Benjamin C.
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