Investigators give timeline leading up to Florida plane crash

About 12:47 p.m. Eastern time, the crew transmitted to ATC that they were encountering light, clear ice, which was manageable and also moderate turbulence. While in contact with Miami Air Route Traffic Center, the crew transmitted that they were at 35,000 feet. With moderate turbulence, with altitude deviations of about 700 feet, the crew reported the outside temperature was minus 47 Celsius, which is minus 53 Fahrenheit, and they were managing the ice, but were in moderate turbulence. Very soon after, the crew transmitted, we are picking up precipitation, requesting to climb to 37,000 feet if able, which was approved by FAA. Air traffic control. Less than 30 seconds later, a transmission from the airplane announced the descent, followed by a mayday call. About 12:48 Eastern, the airplane transmitted, we are in an overspeed condition descending, with the rest unintelligible. Subsequent communications described that the airplane was descending rapidly and gave an altitude call out. Sadly, all aboard were lost.