Three ATR 72's have since crashed due to icing: TransAsia Airways Flight 791 crashed on 21 December 2002, killing both pilots. Aero Caribbean Flight 883 crashed on 4 November 2010, killing all 68 people on board. UTair Flight 120 crashed on 2 April 2012, due to a lack of de-icing of the aircraft prior to takeoff. 33 of the 43 people on board were killed. The crash of TransAsia Airways Flight 791 was attributed to water droplet size that was beyond Part 25, Appendix C of the FAA design certification.