NTSB Identification: CHI07FA140B
Accident occurred Friday, May 11, 2007 in Sharonville, OH
Probable Cause Approval Date: 04/30/2008
Aircraft: Beech V35B, registration: N1835L
Injuries: 3 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

The radar screen depictions of the flights showed an airplane departing from the airport about 1452. A pilot representing N1835L requested flight following. The flight following was not available due to controller workload. The radar showed that the airplane was performing maneuvers north of the airport between 2,600 and 2,900 feet above mean sea level. The radar showed that airplane descending and returning to the airport. The radar showed another airplane departing from the airport to the north about 1500. The second airplane was climbing. The radar data showed that about 1502, the airplanes' radar returns came together. A witness stated, "I looked out my window right in front of my desk after [a co-worker] said 'Oh My God.' I then saw the two planes within about 1/2 mile apart and heading in a direction towards each other but not directly head on. When the planes were very close, ... both rolled inside towards each other and that is when the wings clipped each other. No pre-impact anomalies were detected during the examination of either airplane. The sky condition was clear. Both airplanes were communicating on the airport's Unicom frequency. 14 CFR Part 91.113 stated that the pilots in both airplanes are responsible to see and avoid each other.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The inadequate visual lookout of the pilots in both airplanes and their not maintaining clearance from each others airplane during climb.

Full narrative available

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