On 31 October 1994, a turboprop airliner heading for Chicago, Illinois, crashed into a soybean field at Roselawn in Indiana. All 68 people aboard died. Although the weather was cold and damp that day, no one could believe it when investigators revealed that the crash was caused by a build-up of ice on the wings. Not only did this modern plane have a fully functional de-icing system, but according to US Federal Aviation Administration (FAA) standards, the French-built ATR-72 should have had no problems flying in the cold, damp conditions. The pilots even knew their craft was icing up and attempted to clear it, following de-icing procedures exactly.