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. (B)</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. (D)</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. (C)</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 (D)</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 (B)</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 (D)</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 (D)</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) (B)</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 (B)</p> Signup and view all the answers

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