STORY: Engines from a plane that crashed in Brazil, killing all 62 persons on board, were sent to Sao Paulo for investigation as authorities attempted to determine why the aircraft fell from the sky.
::How did the crash happen?
Here’s everything we know so far.
The ATR-72 turboprop passenger plane was flying from Cascavel, Parana, to Sao Paulo when it crashed at 1:30pm in Vinhedo, about 50 miles northwest of the city.
Brazil’s air force stated that the aircraft operated by the airline Voepass was flying regularly until 1:21 p.m., when it ceased responding to calls and radar contact.
was lost around 1:22 p.m. The plane did not report an emergency.
The sky was clear before the plane began spiralling in an odd circle motion, as seen on this flight monitoring software. 
::What do experts look for?
A U.S. aviation safety expert told Reuters that investigators will look at factors such as weather and how well the engines and controls were performing to help determine what caused the loss of control.
They do have the plane’s black box to help them, which contains the cockpit voice recorder and the FDR flight data recorder.
::What are some possible causes?
Aviation specialists analysed videos of the incident, and some speculated that ice had formed on the plane. On Friday, the airline stated that ice was expected at the altitudes where the plane was flying, but that it should have been within an acceptable range.
Based on the recordings he has seen, a Brazilian aviation engineer and crash investigator believes ice was the cause of the tragedy.
According to an American expert in a university department of aeronautics and astronautics, the rotation downward could have been caused by an engine failure on one side, which the crew mismanaged.
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