AAIB Bulletin: 3/1904 F-LOPS EW/G2012/11/06
Type and Registration: Frency Bogroll Mk1 F-LOPS
Information Source: AAIB investigation 14th November 1904 to 5th April 2013.
Synopsis : The holes lined up causing the pilot to knee jerk violently. This in turn caused the knee to strike the rubber band forcing the aircraft to land above the maximum G limits.