12 Questions
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.
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.
What happens if the aircraft is sufficiently above flap placard speed?
The force limiters in the flap actuators trip, stopping flap motion.
What does the FECU do after the force limiters are tripped?
The FECU attempts to reverse the command and back out of an inferred symmetric lockup condition.
What happens if the attempt to back out of the symmetric flap lockout is unsuccessful?
The FECU shuts down the flap system.
What happens if the flap handle is out of a detented position for more than 5 seconds?
A message is displayed on CAS alerting the flightcrew to place the flap handle in a detented position.
What is the primary function of the Flap Electronics Control Unit (FECU)?
To control and monitor the flap actuation system
How does the Flap Hydraulic Control Module (HCM) control the flap system?
By responding to electrical commands from the FECU and controlling hydraulic flow
What is the purpose of the Shutoff Valve (SOV) in the Flap Hydraulic Control Module (HCM)?
To stop hydraulic flow when not energized
How does the pilot control the flap surfaces?
By manually adjusting the flap handle on the pedestal
What component provides directional and flow control to the Power Drive Unit (PDU)?
The Electro-Hydraulic Servo Valve (EHSV)
How does the flap surface deployment rate depend on the Electro-Hydraulic Servo Valve (EHSV)?
The deployment rate depends on the EHSV command current magnitude
Learn about the Flap Electronic Control Unit (FECU) in an aircraft's flap actuation system, its architecture, interfaces, and data communication with FCCs. Understand the role of the FECU in controlling the flaps and its electrical bonding to the aircraft structure.
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