Incident
A midair collision occurred between two aircraft while they were on final approach to runway 35L at a controlled airport. Numerous instructional and normal aircraft operations were being conducted at the time of the incident.
Sequence of Events
Initially, the pilots of both aircraft were in contact with the local controller and both had received approval for closed traffic. The pilot of one aircraft, a Cessna 152 (registration N94808), received clearance for a touch-and-go landing. The pilot of the other aircraft, a Cessna 150 (registration N9347U), had not communicated with the tower for approximately two minutes before the incident.
Witness Account
According to a witness, the Cessna 152 was established on final approach, and the pilot of the Cessna 150 made a continuous 180-degree turn from the downwind leg to the final approach. The Cessna 150 was reported to have converged on the Cessna 152 from above.
Collision
During the impact, the landing gear of the Cessna 150 broke the windshield of the Cessna 152.
Tower Controller Actions
The tower controller did not see the collision. When she first sighted the aircraft, they were side-by-side. She then cleared the Cessna 152 to land and instructed the Cessna 150 to go around.
Post-Incident Testing
A urine sample from the pilot of the Cessna 150, taken the day after the incident, showed a trace amount (72 ng/mL) of cannabinoid metabolite.