The crash of a military aircraft in a rice filed in Hanoi Wednesday was caused by a technical problem, the Defence Ministry's Air Force sources were quoted as saying by a local newspaper.
Initial investigation shows that the engine's oil system broke down when senior lieutenant-colonel Vu Duy Minh of Unit C21 of the Air Force Division B71 was on his way back after a training session, the sources told the Quan Doi Nhan Dan (People's Military) newspaper.
Upon detecting the problem, Minh flew the Mig-21 to the suburban area of Hanoi and managed to eject himself and parachute to safety before the aircraft crashed into the field in Me Linh District.
The crash didn't cause any casualty and loss for local people.
Meanwhile, the VnExpress website reported that further investigations are ongoing and the black box has been found.
This is the third MiG-21 to crash over the past eight months because of technical problems, including the accident that killed two pilots last November, VnExpress said.