Originally Posted by
Bonway
American Eagle 4184 from Indianapolis to Chicago was the first such incident involving an ATR 72. Following this Aérospatiale did extensive icing testing and found the aircraft safe for icing conditions with a mod including larger de-icing boots.
I recommend to you the book "Unheeded Warning, The Inside Story of American Eagle Flight 4184", published in 1996, by Stephen A. Fredrick, former American Eagle ATR pilot.
The ATR 42 and ATR 72 has the same wing design.
From the NTSB report available at:
http://libraryonline.erau.edu/online...s/AAR96-01.pdf
1.16.2
Previous ATR 42 and 72 Incidents/Accidents
The service histories of the ATR 42 and 72 airplanes were examined by the Safety Board, with an emphasis placed on previous roll control incidents. Twenty-four roll control incidents were found to have been reported since 1986, all of which involved the ATR 42. The Safety Board determined that 13 of the 24 roll control incidents were related to icing conditions. Of these 13 icing-related incidents, the following 5 occurred in weather conditions consistent with freezing drizzle/freezing rain, and involved varying degrees of uncommanded aileron deflections with subsequent roll excursions:
• AMR Eagle/Simmons Airlines at Mosinee, Wisconsin, December 22, 1988;
• Air Mauritius over the Indian Ocean, April 17, 1991;
• Ryan Air over Ireland, August 11, 1991;
• Continental Express at Newark, New Jersey, March 4, 1993;
• Continental Express at Burlington, Massachusetts, January 28, 1994.
From the NTSB:
NTSB Safety Recommendation A-94-182
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: PROHIBIT THE INTENTIONAL OPERATION OF ATR-42 AND ATR-72 AIRPLANES IN KNOWN OR REPORTED ICING CONDITIONS UNTIL THE EFFECT OF UPPER WING SURFACE ICE ON THE FLYING QUALITIES AND AILERON HINGE MOMENT CHARACTERISTICS ARE EXAMINED FURTHER AS RECOMMENDED IN A-94-181 AND IT IS DETERMINED THAT THE AIRPLANES EXHIBIT SATISFACTORY FLIGHT CHARACTERISTICS. (URGENT)