>If we think about it logically
Logically, known problems with the aircraft type and previous examples of icing-related incidents for this aircraft type should be considered along with speculation about remote hacking:
"The National Transportation Safety Board determines that the probable cause of this accident was the loss of control, attributed to a sudden and unexpected aileron hinge moment reversal, that occurred after a ridge of ice accreted beyond the deice boots while the airplane was in a holding pattern during which it intermittently encountered supercooled cloud and drizzle/rain drops, the size and water content of which exceeded those described in the icing certification envelope. The airplane was susceptible to this loss of control, and the crew was unable to recover."
On October 31, 1994, at 1559 Central Standard Time, an Avions de Transport Regional, Model 72-212 (ATR-72), registration number N401AM, crashed during descent after uncommanded roll excursions and a loss of control. The aircraft was leased to and operated by Simmons Airlines, Incorporated, and doing business as American Eagle Flight 4184. … The airplane was destroyed by impact forces, and the flight crew of four (captain, first officer and two flight attendants) and 64 passengers received fatal injuries.
https://www.faa.gov/lessons_learned/transport_airplane/accidents/N401AM
Of the recent air carrier accidents, the one with arguably the most significant implications regarding in-flight icing is the October 31, 1994, crash of an ATR-72 turbopropeller transport aircraft. The aircraft was on a flight from Indianapolis, Indiana, to Chicago’s O’Hare International Airport, flying with the autopilot engaged and in a holding pattern, descending to 8,000 feet through supercooled clouds and SLD.
According to the NTSB, the encounter with the icing conditions in the hold resulted in a ridge of ice accreting aft of the aircraft’s wing deicing boots and in front of the aircraft’s unpowered ailerons. As the aircraft descended to its cleared altitude, its AOA increased and the airflow began to separate in the area of the right aileron. This resulted in a sudden and unexpected aileron hinge reversal that exceeded the autopilot’s ability to control the aircraft, and it disconnected. This left the flightcrew in a full right-wing-down position within a quarter of a second, which was followed by a series of unsuccessful attempts to correct the aircraft’s attitude, resulting in a descent that at times reached 24,000 feet per minute and precipitated the structural failure of the aircraft’s elevators. The aircraft then impacted a soybean field at high speed resulting in the deaths of all 68 passengers and crew.
https://www.faa.gov/sites/faa.gov/files/2022-11/AC_91-74A_0.pdf