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On a large jet transport aircraft, the flap/slat asymmetry protection system...

  • A
    uses the yaw damper actuators and assists the crew with trimming the aircraft in the case of a flap/slat asymmetry condition.
  • B
    constantly monitors the flap/slat positions on both wings and stops the flap/slat motion immediately if it detects an emerging asymmetry condition.
  • C

    is incorporated within the flight control computers and will assist the pilot with trimming the aircraft through ailerons and rudder control if a flap/slat asymmetry condition occurs.

  • D
    uses mechanical springs in combination with aerodynamic forces to automatically retract flap/slat surfaces if an asymmetric flap/slat condition occurs.
Learning Objective 021.05.02.01.07: Explain how a flap/slat asymmetry protection device functions, and describe the implications of a flap/slat asymmetry situation.

A flap asymmetry situation can be disastrous. This is because flaps change the coefficient of lift of the wing massively, in order to provide more lift, and therefore allow flight at slower speeds. Flaps can easily double the coefficient of lift from a wing, whilst also increasing the drag, possibly by a lot.

An aircraft will fly terribly with even a medium sized flap asymmetry, with high drag and high lift on one wing but not the other. A way to avoid this situation is by having a flap/slat asymmetry protection system. This detects the actual flap/slat position in each wing with great accuracy, and as soon as an asymmetry is detected, the system will stop the flaps/slats from moving, and show up a warning or caution to the pilots.

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