What happened
A midair collision occurred approximately 38 miles southeast of the Nashville Metropolitan Airport involving a Boeing 737 operated by Piedmont Airlines as Flight 488 and a flight of four F-4 fighter jets with the call sign Peach 41. At the time of the incident, Flight 488 was inbound to Nashville under an Instrument Flight Rules clearance and had been cleared by Memphis Air Route Traffic Control Center to descend to 6,000 feet, passing through approximately 12,000 feet.
The military flight, Peach 41, had just completed a low-level, high-speed flight on military training route VR-1051. The first element of the formation, consisting of aircraft #1 and #2, began a left climbing turn to allow the trailing element (#3 and #4) to join. During this maneuver, the lead pilot requested an IFR clearance from air traffic control. Controllers instructed Peach 41 to maintain visual flight rules and advised both flights of each other's position.
Flight 488 had visually acquired the F-4s and was cleared to deviate to the left. The leader of Peach 41 obtained radar contact with Flight 488 and climbed above 13,000 feet. However, the second element of the F-4 formation saw Flight 488 and remained at a lower altitude to pass underneath the airliner. The crew of Flight 488 did not take evasive action, later reporting that no room existed for them to maneuver out of the military aircraft's flight path.
The investigation
The investigation examined the coordination between air traffic control and the two distinct flight operations. Key findings included the failure of the second element of F-4s to maintain separation from the commercial airliner despite visual contact. The crew of Flight 488 reported being unable to maneuver, indicating a critical loss of situational awareness or spatial conflict during the descent phase.
Findings
Contributing factors included the complex interaction between a descending commercial jet and a military formation executing tactical maneuvers. The air traffic control system provided position advisories but did not prevent the vertical overlap. The military flight leader's decision to climb while the trailing element remained low created a hazardous convergence point with the airliner's descent path.