What does flap asymmetry refer to?

Flap asymmetry refers to a condition where the flaps on one wing are deployed to a different angle than those on the other wing. This misalignment can occur even with a difference as small as 5º, which can lead to compromised flight control and increased drag on the affected side. Proper flap extension is critical for maintaining the aircraft's aerodynamic balance.

The other choices do not accurately describe flap asymmetry. Uneven weight distribution during flight typically pertains to cargo or passenger loading rather than flap configuration. Flap retraction failure describes a mechanical failure rather than the asymmetrical positioning of deployed flaps. Mismatch in flap sensor feedback relates more to the electronic or indicator systems and how they report the flap positions rather than the physical alignment of the flaps themselves. Thus, the concept of flap asymmetry is specifically linked to the difference in flap extension across the wings, making the choice regarding the 5º difference the correct understanding of this condition.