D.Flap System Electronics: FECU and Flap Control
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Questions and Answers

What happens if the aircraft is above the flap placard speed when flap deployment is commanded?

  • The airspeed digits on the primary flight display turn red and an audible warning sounds, but the FECU still tries to deploy the flaps. (correct)
  • The airspeed digits on the primary flight display turn green and an audible warning sounds, but the FECU still tries to deploy the flaps.
  • The airspeed digits on the primary flight display turn green and an audible warning sounds, and the FECU does not try to deploy the flaps.
  • The airspeed digits on the primary flight display turn red and an audible warning sounds, and the FECU does not try to deploy the flaps.

    • What happens if the aircraft slows below the flap placard speed for that flap position?

  • The warning indications cease and the flaps extend to the selected position. (correct)
  • The warning indications cease and the flaps do not extend to the selected position.
  • The warning indications continue and the flaps do not extend to the selected position.
  • The warning indications continue and the flaps extend to the selected position.

    • What happens if the aircraft is sufficiently above flap placard speed?

  • The FECU shuts down the flap system.
  • The FECU tries to deploy the flaps regardless of airspeed.
  • The force limiters in the flap actuators do not trip, allowing flap motion.
  • The force limiters in the flap actuators trip, stopping flap motion. (correct)

    • What does the FECU do after the force limiters are tripped?

    <p>The FECU attempts to reverse the command and back out of an inferred symmetric lockup condition.</p> Signup and view all the answers

    What happens if the attempt to back out of the symmetric flap lockout is unsuccessful?

    <p>The FECU shuts down the flap system.</p> Signup and view all the answers

    What happens if the flap handle is out of a detented position for more than 5 seconds?

    <p>A message is displayed on CAS alerting the flightcrew to place the flap handle in a detented position.</p> Signup and view all the answers

    What is the primary function of the Flap Electronics Control Unit (FECU)?

    <p>To control and monitor the flap actuation system</p> Signup and view all the answers

    How does the Flap Hydraulic Control Module (HCM) control the flap system?

    <p>By responding to electrical commands from the FECU and controlling hydraulic flow</p> Signup and view all the answers

    What is the purpose of the Shutoff Valve (SOV) in the Flap Hydraulic Control Module (HCM)?

    <p>To stop hydraulic flow when not energized</p> Signup and view all the answers

    How does the pilot control the flap surfaces?

    <p>By manually adjusting the flap handle on the pedestal</p> Signup and view all the answers

    What component provides directional and flow control to the Power Drive Unit (PDU)?

    <p>The Electro-Hydraulic Servo Valve (EHSV)</p> Signup and view all the answers

    How does the flap surface deployment rate depend on the Electro-Hydraulic Servo Valve (EHSV)?

    <p>The deployment rate depends on the EHSV command current magnitude</p> Signup and view all the answers

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