Collision in the Traffic Pattern
A Cessna 172L (N7668G) was cleared to enter right traffic and instructed to report entering downwind and to watch for other aircraft in the pattern. When the pilot did not report as requested, the tower operator observed a collision course and instructed him to turn downwind, advising him of the traffic. As the pilot prepared to turn downwind, he saw another aircraft already in the pattern and immediately initiated a turn to avoid a collision. A few seconds later, he felt a bang on the tail of his aircraft.
Evasive Maneuvers by the Second Aircraft
The pilot of a Cessna 172M (N20858) was on downwind when he saw the other aircraft approaching from his left. He turned and dove his aircraft to avoid a collision. Within a few seconds, he felt a bump. After the collision, both aircraft landed without incident.
Pilot Observations
Neither pilot reported seeing the other aircraft until they were within a few hundred feet of each other. The source does not provide any information on injuries, damage, or other specifics beyond the reported sensations of a bang and a bump.