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Aircraft tailstrike avoidance system

  • US 20020066829A1
  • Filed: 01/08/2002
  • Published: 06/06/2002
  • Est. Priority Date: 12/02/1999
  • Status: Active Grant
First Claim
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1. In an aircraft flight control system having a normal pitch command signal provided to a pitch control device for altering the aircraft'"'"'s pitch attitude, an improvement for reducing the likelihood of an aircraft tailstrike, the improvement comprising:

  • (a) determining a current tailskid height and a current tailskid closure rate;

    (b) comparing the current tailskid closure rate with a threshold closure rate to determine an excess closure rate amount, the threshold closure rate being dependent upon the current tailskid height; and

    (c) adding an incremental nose-down pitch command signal to the normal pitch command signal to avoid a potential aircraft tailstrike, the incremental nose-down pitch command signal being calculated as a function of the excess closure rate amount.

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