Editing Vortex generator (section)

==Maximum landing weight==
Because the landing weights of most light aircraft are determined by structural considerations and not by stall speed, most VG kits increase only the takeoff weight and <u>not</u> the landing weight.  Any increase in landing weight would require either structural modifications or re-testing the aircraft at the higher landing weight to demonstrate that the certification requirements are still met.<ref name="Busch"/>  However, after a lengthy flight, sufficient fuel may have been used, thereby bringing the aircraft back below the permitted maximum landing weight.