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Air-ground logic system and method for rotary wing aircraft

  • US 6,259,379 B1
  • Filed: 11/29/1999
  • Issued: 07/10/2001
  • Est. Priority Date: 07/29/1996
  • Status: Expired due to Term
First Claim
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1. A ground proximity warning system for rotary wing aircraft comprising:

  • a sensor disposed on the aircraft to detect a flight condition;

    a warning computer having an input connected to the sensor, the warning computer including a controller coupled to the input for generating a signal representing the flight condition and a warning device coupled to the controller for receiving the signals and generating an aural warning to the pilot indicating the flight condition; and

    an air-ground detector wherein the air-ground detector comprises an engine torque detector disposed to detect the torque of one or more of the aircraft'"'"'s engines, wherein the condition when the torque is below one of an on ground torque or an autorotation torque is a sufficient condition for causing the controller to move into a ground state whereby said air-ground detector is disposed to detect whether the aircraft is on the ground or in the air, the air-ground detector being coupled to the warning computer and disposed to disable the controller or the warning device when the aircraft is on the ground.

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