What is flap asymmetry? What will be the action should there is a flap asymmetry?

What is flap asymmetry? What will be the  action should there is a flap asymmetry?
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1 Answer

Answer :

If flaps of left and right wing are moving at  different speed or the inboard and outboard  flap of the same wing are moving a different  speeds, then one flap will travel to a higher  angle than the other. This condition is called  flap asymmetry.
Flap asymmetry is detected by the Asymmetry  Position Pick-off Unit or in short APPU. The  signal is sent to the SFCC. If flap asymmetry has  reached a certain value, the SFCC will command  the Wing Tip Brakes to activate. Then the WTB  
advanced above the cruise position. However,  the full authority type EEC takes control of  engine during its entire range of operation – starting from reverse to maximum take-off  thrust. The full authority type EEC is called  FADEC or Full Authority Digital Electronic  Control.
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