A US Air Force Douglas VC-47D (43-48758) plane had been involved in an accident and was considered damaged beyond repair. The aircraft was sold on the spot to Navega‡?o A‚rea Brasileira. Mechanics, not qualified for the job, were ordered to repair the aircraft. On September 21 the aircraft was authorized to carry out a 7-minute test flight. The day after, another test flight was planned. Shortly after takeoff on the second test flight, the left main undercarriage would not retract. Two minutes later the gear worked loose and struck the wing which folded upwards. The remaining (right) wing broke up and the airplane crashed vertically into the ground. PROBABLE CAUSE: “Utilisation of unqualified personnel for repairing an aircraft after an accident.”