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Impending aircraft tail strike warning display symbology

  • US 6,121,899 A
  • Filed: 04/16/1999
  • Issued: 09/19/2000
  • Est. Priority Date: 04/16/1999
  • Status: Expired due to Term
First Claim
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1. In an aircraft optical display system that produces images for observation by a pilot, the display system including an image source providing an image carried by light propagating along an optical path and an optical display surface positioned so as to provide an image for observation by the pilot, a method of providing for display on the display surface aircraft tail strike warning symbology that alerts the pilot to a possible impending incident in which the aircraft tail strikes the ground as the aircraft moves, comprising:

  • providing a nominal aircraft tail strike pitch attitude parameter established by aircraft-specific dimension criteria;

    deriving actual aircraft pitch attitude information, the actual aircraft pitch information derived from aircraft pitch attitude sensor information;

    offsetting the nominal aircraft tail strike pitch attitude parameter by the actual aircraft pitch attitude information to produce an aircraft margin signal; and

    producing for display aircraft tail strike warning symbology whenever a signal corresponding to the aircraft pitch margin signal is not within a preassigned operational tolerance.

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