Russia's UTair Aviation has suspended flights of its ATR 72-200 aircraft until it knows the results of an investigation into a deadly crash in Siberia, the company said.
A 21-year-old UTair ATR 72-200 crashed after takeoff from Tyumen in western Siberia on Monday, killing 31 of the 43 people on board. UTair said the plane crashed while trying to make an emergency landing.
Preliminary analysis of the "black box" data recorders showed both engines were working when the plane hit the ground, the Interstate Aviation Committee, which investigates air crashes in 12 ex-Soviet republics, said on Tuesday.
The plane rose to an altitude of about 210 meters after takeoff, then dipped to its right side and then sharply left as it crashed, the Moscow-based committee said.
UTair director Andrei Martirosov said there were no grounds for doubt so far that the plane was in a good technical condition and that the decision was made to reassure passengers.
UTair's website says it has three of the twin-engine, turbo prop planes. The statement said it would use ATR 72-500s built last year to replace the grounded planes.
The federal Investigative Committee said the plane had notched up 35,000 flying hours since going into operation in 1992 and had not had a "serious" technical check since 2010.
Russia and the former Soviet republics had one of the world's worst air-traffic safety records last year, with a total accident rate almost three times the world average, the International Air Transport Association said.