On September 27, 2012, during the test flight of an ANKA prototype aircraft, a technical problem occurred that caused it to crash.
The ANKA performed its first flight in December 2010, and has flown a six-month-long development test flights programme (for a total of about 100 sorties), began acceptance testing activities on September 24, 2012.
The Turkish aircraft had been flying for 120 minutes and was at 10,000 feet, when it reportedly lost contact with its ground control station and crashed 4 kilometers from Eskisehir.
Investigations to determine the origin of the fault continue, and acceptance test activities will be continued with other airframes.
Source: Defence Professionals