10 Questions
What component stops hydraulic flow when not energized?
SOV (Solenoid Operated Valve)
What provides directional and flow control to the PDU?
EHSV (Electro-Hydraulic Servo Valve)
What happens if flap deployment is commanded at an airspeed higher than the flap placard speed?
The airspeed digits turn red on the primary flight display and an audible warning sounds.
What happens if the aircraft slows below flap placard speed for a specific flap position?
The flaps extend to the selected position.
What stops flap motion if the aircraft is sufficiently above flap placard speed?
Force limiters in the flap actuators.
Where are the flap positions and system status transmitted to for display to the flightcrew?
Modular avionics units and primary flight displays.
What records system status and fault information for later analysis?
FECU (Flap Electronic Control Unit).
What provides the 28 Vdc required to energize the solenoid coil?
FECU (Flap Electronic Control Unit).
What determines the flap surface deployment rate?
The EHSV command current magnitude.
What is the purpose of the HCM (Hydraulic Control Module) in relation to the PDU?
The HCM contains components that control hydraulic flow to the EHSV, which in turn provides control to the PDU.
Learn about the flap actuation system in aircraft, which controls the flap surfaces on the wings. Understand how hydraulic systems, control modules, and actuators work together to extend and retract flaps. Explore the role of the Flight Electronics Control Unit (FECU) in driving hydraulic actuation.
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