Embraer's first KC-390 prototype made a runway excursion while conducting ground tests. The company announced the incident on 5 May adding that an investigation into the causes of the occurrence has been initiated immediately.

The prototype, registration PT-ZNF, returned to flight two months ago after fixing damage caused by a dangerous incident in flight test on 12 October. In that incident, the crew recovered the aircraft after losing control during a slow-speed stall test.

The company’s first production aircraft is expected to enter service with the Brazilian Air Force later this year. whether the incident could delay to its entry into service is not yet announced. The aircraft was designed for cargo and troop transportation, aerial refuelling and search and rescue missions.