On 28 November 2004, a Challeger 601 operated by Global Aviation crashed on takeoff from Montrose, Colorado, USA, following loss of control due to airframe icing.
This is an extract from the Summary of the official report into the accident published by the National Transportation Safety Board (NTSB) (USA)
“On November 28, 2004, about 0958 mountain standard time, a Canadair, Ltd., CL-600-2A12, N873G, registered to Hop-a-Jet, Inc., and operated by Air Castle Corporation dba Global Aviation as Glo-Air flight 73, collided with the ground during takeoff at Montrose Regional Airport (MTJ), Montrose, Colorado. The on-demand charter flight was operated under the provisions of 14 Code of Federal Regulations (CFR) Part 135 on an instrument flight rules (IFR) flight plan. Instrument meteorological conditions prevailed, and snow was falling. Of the six occupants on board, the captain, the flight attendant, and one passenger were killed, and the first officer and two passengers were seriously injured. The airplane was destroyed by impact forces and postcrash fire. The flight was en route to South Bend Regional Airport (SBN), South Bend, Indiana.“
The probable cause of the accident was given as:
“…the flight crew's failure to ensure that the airplane’s wings were free of ice or snow contamination that accumulated while the airplane was on the ground, which resulted in an attempted takeoff with upper wing contamination that induced the subsequent stall and collision with the ground. A factor contributing to the accident was the pilots’ lack of experience flying during winter weather conditions.”
- NTSB Accident Brief AAB-06/03, Crash During Takeoff in Icing Conditions, Canadair CL-600-2A12, N873G, Montrose, Colorado, November 28, 2004: /bookshelf/books/1059.pdf