Jan 20, 2011 3:43 PM by Bea Karnes
DENVER -- Investigators are studying weather conditions at the time a single-engine airplane crashed in the southern Colorado mountains and killed a doctor and a retired businesswoman from Iowa.
The National Transportation Safety Board disclosed the study in a preliminary report late Wednesday.
The report doesn't suggest any possible causes for the crash, including weather.
The pilot, Michael O. Welton, 66, and Roswitha Marold, 70, of Waterloo, Iowa, were killed when the Piper Malibu crashed Jan. 9.
The wreckage was found the next day about 110 miles southwest of Denver.
Search-and-rescue officials say the wreckage was difficult to find in part because the plane appeared to fall nearly vertically, leaving few damaged trees.