Incident / UTair Aviation ATR-72 (VQ-BLJ), while undergoing engine runs during a maintenance inspection, rolled forward until it collided with a stored SKOL Yak-40 (RA-87340) at Surgut Airport (USRR), Russia. No injuries reported.
According to Ria.ru, the incident occurred on the evening of April 1st at Surgut Airport. The UTair ATR 72 was undergoing maintenance at the airport at this time, with its engines on.
The Ural Investigative Directorate for Transport report states that the aircraft suffered a breakdown of the braking system and then began spontaneously moving, colliding with a nearby aircraft.
The other aircraft was a Yakovlev Yak-40, a regional trijet produced from 1967 to 1981. Reports suggest the plane belonged to the charter operator Skol Airlines. While the ATR 72 suffered some mechanical damage, the Yak-40 saw its nose crushed by the impact. The turboprop was left wedged under the Yak’s wing, with the engine hitting the nose.
The incident is currently under investigation by the authorities and will report back soon. It’s extremely rare for aircraft to roll away, given the advanced systems onboard. However, bizarre incidents do occur from time to time.