Officials in Ukraine said the crash on September 22 of a military training jet was most likely caused by pilot error.
Defense Ministry spokesman Volodymyr Zamana told Interfax that the flight-data recorders aboard the L-39 combat training craft have been studied and have shown that the aircraft was in working order.
Earlier, ministry officials were quoted as saying the crash was caused by an engine fire shortly after takeoff.
The L-39 crashed shortly after taking off from the Kharkiv Aviation Institute in Kharkiv Oblast.
The cadet pilot, who has not been identified, died in the incident.
Ukraine has grounded its fleet of L-39s pending the investigation.
Based on reporting by Interfax and ITAR-TASS