Boeing has selected a remedy for the wing drop problem on the F/A-18E/F Super Hornet after flight testing at the Naval Air Station at Patuxent River, Maryland. A slotted fairing allows air to flow both ways through the wing fold hinges, making it aerodynamically invisible and preventing the asymmetric stall which led to a roll of up to 30° in high speed subsonic manoeuvres.
Source: Flight International