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Fly-by-wire lateral control system

  • US 4,472,780 A
  • Filed: 09/28/1981
  • Issued: 09/18/1984
  • Est. Priority Date: 09/28/1981
  • Status: Expired due to Term
First Claim
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1. In an aircraft, a fly-by-wire type lateral control system, comprising:

  • a first set of lateral control surfaces comprising a plurality of control surfaces;

    a separate first-set electrohydraulic actuator drivingly connected to each lateral control surface of said first set;

    a second set of lateral control surfaces comprising a plurality of control surfaces;

    a separate second-set one/one fail-operational electrohydraulic actuator drivingly connected to each lateral control surface of said second set, each said actuator having two hydraulic sections for redundant operation;

    a third set of lateral control surfaces comprising a plurality of control surfaces;

    a separate third-set two/one fail-operational, electrohydraulic actuator drivingly connected to each lateral control surface of said third set, each said actuator having two hydraulic sections for redundant operation;

    four separate hydraulic pressure supplies;

    four separate electric control signal command channels;

    control means for said system comprising;

    first means associating each first-set actuator with a single one of said channels and a single one of said hydraulic pressure supplies;

    second means associating each second-set actuator with three of said channels and associating each redundant hydraulic section of each second-set actuator with a single hydraulic pressure supply;

    third means associating each third-set actuator with all four of said channels and associating each redundant hydraulic section of each third-set actuator with a single hydraulic pressure supply; and

    failure responsive means for causing the lateral control system to continue to be operable after three electric channel failures, or three hydraulic pressure supply failures, or a combination of three electrical channel and three hydraulic pressure supply failures.

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