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Aircraft trim actuator shutdown monitor system and method

  • US 4,599,698 A
  • Filed: 05/02/1983
  • Issued: 07/08/1986
  • Est. Priority Date: 05/02/1983
  • Status: Expired due to Term
First Claim
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1. Apparatus for selectively disabling the trim actuator of an aircraft outer loop axis control channel having an inner loop stability augmentation system (SAS) actuator which in combination with the trim actuator maintains aircraft attitude in an associated control axis, each actuator capable of reciprocating motion within a related range of position values, and each having a position sensor for providing a signal indicative of the actual actuator position value in the range, the rate of change of position and direction of travel of the trim actuator determinating the position and direction of travel of the SAS actuator to provide, in combination, supportive effect on the aircraft attitude in the associated axis, the apparatus comprising:

  • direction indicating means, responsive to each actuator position signal, for providing a trim actuator direction signal indicative of the direction of travel of the trim actuator at a rate of change of position, and for providing a SAS actuator direction signal indicative of the direction of travel of the SAS actuator within a selected range of SAS actuator position values;

    opposite direction detector means, responsive to said direction indicating means, for providing a trim actuator disable signal in response to the simultaneous presence of said trim actuator direction signal and said SAS actuator direction signal indicating directions of travel having opposing effects on the aircraft attitude in the control axis; and

    means for disabling operation of the trim actuator in response to the presence of said trim actuator disable signal.

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