GFA AD 663 Cancelled.pdf
PROHIBITION OF ALL FLIGHTS
CANCELLED Refer EASA AD 2011-0135
A fatal accident occurred to a L-13 Blanik sailplane in which the main spar of the right wing failed near the wing root due to positive load. The right wing detached from the aircraft and the pilot lost control of the sailplane. The preliminary investigation has revealed that the fracture may have been due to fatigue. EASA reassessed the the inspection method as described in Aircraft Industries a.s. Mandatory Bulletin No. L13/109a and concluded that the inspection method may not be sufficient for detecting potential fatige cracks, as a conservative measure, this AD is prohibiting any operations of L-13 and L-13 A Blanik sailplanes. This AD is considered to be an interim measure, until a modification and/or a proper inspection program has been developed.