The failure of the hydraulic system caused the crash of the Mil Mi-28N helicopter at Dubrovichi testing ground near Ryazan, Russian Air Force Commander-in-Chief Col. Gen. Viktor Bondarev told the press on Sunday.
"During a training flight of Berkuty piloting group today at the moment of breaking up the control system of the Mi-28 failed, a warning about the failure of the second hydraulic system appeared and the voice signal 'Failure of the hydraulic system' switched on," he said.
A spokesperson for the Russian Defense Ministry also said on Sunday that "all demonstration flights that were made today as part of the Aviamix program at the Dubrovichi testing ground in the Ryazan region, where the Mi-28 helicopter had crash landed, were performed strictly in accordance with the safety requirements."
"The aerobatic flights were carried out within a safe distance from spectators. Any risk to spectators and journalists at such events is ruled out," the spokesperson told reporters.
Previously the Defense Ministry press service said that a Mi-28N helicopter during demonstration flights of Berkuty piloting group at Dubrovichi testing ground in Ryazan region entered a flat spin and made a crash landing.
It said one of the pilots died and the other survived and was in satisfactory condition.
At the crash scene, efforts are underway to promptly dismantle the flight recorders which will be handed over to a panel of experts for deciphering and examination, the Russian Defense Ministry spokesperson told Interfax.
"The exact cause of today's crash of the Berkuty aerobatic team's Mi-28 helicopter at the Dubrovichi testing ground will be established after the flight data have been studied," the spokesperson said.
An Air Force Central Command commission is working at the scene.
Earlier on Sunday Russian Air Force Commander-in-chief Col. Gen. Viktor Bondarev ordered all Mi-28 helicopter flights to be temporarily grounded after the air crash that occurred during demonstration flights at the Aviadarts air show near Ryazan.
All demonstration flights at the Dubrovichi airfield that had yet to be carried out today have been canceled.
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