SIUYA,
What is your point? After the Roselawn ATR-72 accident all turboprop aircraft were required to be re-certified for flight in known icing conditions and these tests identified a deficiency with the ATR and resulted in the need for increased de-ice boot area on the ATR type. Both the Saab 340 and the Saab 2000 passed these tests by a wide margin along with the other turboprop types except the ATR.
Significantly the Roselown accident identified the 'beyond known icing conditions' supercooled water droplet phenomenon, which until that accident was not fully understood by meteorologists and the manufacturers of aircraft ice protection systems. Such information is now incorporated in the flight manuals of transport category turboprop aircraft.
The NTSB investigation of the Americal Eagle incident also identified the aircraft de-icing boots autocycling function was unserviceable on that flight and the aircraft was dispatched under the MEL which required both the manual inflation system to be operative and the crew to manually inflate the boots when in icing conditions. It was reported that up until the time the upset occurred the crew had not operated the boots in the manual mode despite having been flying in known icing conditions.
The American Eagle upset resulted from a combination of lack of adherance to standard operating procedures (proper IAS flight mode for climb in icing conditions to ensure speed control together with proper use of ice protection systems) and poor situational awareness of the circumstances. This combination of circumstances can occur with any aircraft if not correctly managed by the flight crew!!
At the October 2006 Saab operators conference in Florida the Saab Aircraft Chief Pilot (AKE Wargh) led the discussion and review session on flight in icing condition. At the commencement of that session he introduced the REX representative to the other operator representatives and asked REX to address this particular session as they (REX) had standard operating procedures which in Saab's view mitigated against any possibility of an inflight upset associated with flight in icing conditions for the Saab 340 type.
So SIUYA what is your point??