(CNN) -- The pilots of TransAsia Airways Flight GE235 grappled with problems with both the plane's engines before it clipped a bridge and crashed
into a river, Taiwan's Aviation Safety Council said Friday.
The stall warning went off in the cockpit five times, starting from about 37 seconds after takeoff, the aviation agency told reporters, citing information from the aircraft's flight recorders.
The two engines on the ATR 72 twin-engine turboprop aircraft stopped producing power one after the other, and the pilots failed in an attempt to
restart one of them, according to the agency.
The pilots issued a mayday alert to air traffic control, announcing an engine flameout, or power failure.
Flight GE235 crashed into the Keelung River in Taiwan's capital, Taipei, shortly after taking off Wednesday with 58 people on board.
Authorities say that so far, 35 people have been confirmed dead, 15 survived and 8 are still missing, according to Taiwan's official news agency CNA. Two people on the ground were also hurt.
The Aviation Safety Council said Friday it was still collecting information on the disaster and wasn't yet able to say what caused the engines to
shut down.
The agency says it will take months to carry out a full analysis of the contents of Flight GE235's flight data recorder and cockpit voice recorder.
The reported engine problems tally with the account of Huang Chin-shun, a 72-year-old survivor of the crash.
"I thought something's wrong with the engine because I always take this flight," Huang told CNN affiliate ETTV from his hospital bed on Thursday.
Stephen Fredrick, a pilot who once flew ATRs for American Airlines, told CNN this week that it looked like Flight GE235 was gliding when dashboard cameras on the ground captured the moments before it crashed into the river.
Fredrick pointed to the position of the nose, slightly down, and the wings, level. He said he thought the plane may have lost power in one or
both of the engines.
TransAsia was involved in another deadly disaster in July. Forty-eight people died after an ATR 72 aircraft operated by the airline crashed as
it was attempting to land in the Taiwanese Penghu Islands during bad weather
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