Sequence of Events
Aircraft N8267W was conducting a practice NDB approach to runway 29 under an air traffic control clearance. The flight instructor served as the pilot-in-command in the right seat, while a hooded student pilot occupied the left seat and was flying. The aircraft was proceeding level at the minimum descent altitude for a low pass.
Simultaneously, aircraft N30019 had entered the downwind leg for runway 24 and was in a left turn during a visual flight rules approach to that runway at the time of the collision.
Communications and Awareness
The crew of N8267W broadcast their position and intentions on the UNICOM frequency using a 'blind' broadcast. The pilot of N30019 had received a UNICOM advisory that runway 24 was in use but did not broadcast their own position or intentions. The instructor pilot in N8267W did not see N30019 until after the collision occurred.
Collision Dynamics
Evidence indicates that N30019 passed beneath N8267W while in a left turn. The right wing outer panel of N30019 struck the underside of N8267W's right wing and landing gear. Witness statements estimated the closing angle at 130 degrees. Examination of impact scratch marks allowed investigators to calculate the collision angle as 92 degrees.