Incident Overview
A near midair collision occurred at 5,000 feet MSL in uncontrolled airspace, within the 30-mile veil of Chicago O'Hare International Airport. The area is subject to a Mode C transponder requirement. The two aircraft involved were a commuter aircraft and a twin-engine Beech Baron. The closest horizontal separation was approximately 200 feet, with vertical separation of about 100 feet.
Evasive Maneuver
The crew of the commuter executed an evasive maneuver consisting of a steep 45-degree bank combined with a nose-down pitch of about 15 degrees to avoid the Beech Baron. The maneuver was performed to increase separation and prevent a potential collision.
Traffic Advisory
O'Hare Approach Control had previously issued a traffic advisory to the commuter, which was identified as a Midway commuter. The advisory warned of the presence of the other aircraft. Despite this, the two aircraft converged to within close proximity, prompting the evasive action.