The NTSB investigation found that the nose gear was improperly maintained.
Key Lime Air had a previous incident at DIA on April 5, 2006, when the pilot took off, experienced a control problem and landed without incident, the NTSB said.
The NTSB found that maintenance personnel improperly routed a cable and that the maintenance inspector failed to notice the problem.
Key Lime Air's fatal crashes
Date Place Fatalities Cause
* March 17, 2000 Dighton, Kan. 3 Weather and pilot error
* June 5, 2000 Kiowa 2 Pilot error
* Sept. 24, 2001 Pagosa Springs 2 Pilot error
Source: National Transportation Safety Board
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The NTSB said that most of the Key Lime Air crashes were the result of pilot error and poor maintenance.
Key Lime Owner Honeycutt said that the snow, and piles of old snow, partially to completely obscured the ground markings, the signs and the runway lights that help guide pilots.
An early NTSB report found the Key Lime cargo plane was in a danger zone for over a minute before alarms went off.