2021 Colorado mid-air collision
Key Lime Air Flight 970 · BB CO LLC N416DJ

Mid-air collision
Date	12 May 2021 (12 May 2021)
Summary	Mid-air collision on final approach to parallel runways
Site	Cherry Creek State Park, Arapahoe County, Colorado 39°37′30″N 104°51′07″W / 39.62500°N 104.85194°W / 39.62500; -104.85194
Total fatalities	0
Total injuries	0
Total survivors	3 (on both planes)
First aircraft
A Key Lime Air Swearingen SA226 Metroliner similar to the aircraft involved in the crash
Type	Swearingen SA226TC Metroliner
Operator	Key Lime Air
IATA flight No.	KG970
ICAO flight No.	LYM970
Call sign	KEY LIME 970
Registration	N280KL
Flight origin	Harriet Alexander Field, Salida, Colorado
Destination	Centennial Airport, Colorado
Occupants	1
Passengers	0
Crew	1
Fatalities	0
Injuries	0
Survivors	1
Second aircraft
N416DJ, the Cirrus SR22 GTS G5 carbon involved in the accident
Type	Cirrus SR22 GTS G5
Operator	private flight owned by BB CO LLC
Call sign	NOVEMBER 416 DELTA JULIET
Registration	N416DJ
Flight origin	Centennial Airport, Colorado
Destination	Centennial Airport, Colorado
Occupants	2
Passengers	1
Crew	1
Fatalities	0
Injuries	0
Survivors	2

The 2021 Colorado mid-air collision (also known as The Centennial Miracle, The Centennial Mid-Air Miracle or Miracle on the Centennial) occurred on approach to Centennial Airport near Denver, Colorado, on 12 May 2021.

Events

At about 10:20 AM local time, a Cirrus SR22 light aircraft collided in mid-air with Key Lime Air Flight 970, an air charter cargo flight from Salida, Colorado, operated by a Swearingen SA226-TC Metroliner over Cherry Creek State Park in Arapahoe County. The collision destroyed a large section of the cabin of the Metroliner and damaged the empennage, but the pilot—who was the sole aircraft occupant and, based on communications with air traffic control (ATC), was initially unaware of the extent of the damage—was able to make a safe landing at Centennial Airport despite the significant damage to the fuselage and subsequent difficulties with the right-hand engine. The pilot of the Cirrus, which was a private rental aircraft on a local flight from Centennial Airport, deployed the Cirrus Airframe Parachute System (CAPS) and made a safe parachute-assisted forced landing near Cherry Creek Reservoir; the pilot and single passenger were not injured.^[1] It was covered heavily by local and national media outlets due in part to the lack of fatalities or injuries to the parties involved, a rare outcome in a midair collision.^[2] Aviation news site AVweb dubbed the incident "the Centennial Miracle".^[3]

Investigation

The National Transportation Safety Board determined that the accident was caused by failures of airmanship and ATC. The SR22 pilot flew too fast in the airfield traffic pattern and overshot his turn, resulting in the SR22 crossing the extended centerline of the parallel runway where the Metroliner was on final approach for landing. When the collision occurred, the SR22 wing flaps had been lowered to 50% but the aircraft was flying at 140 kn (160 mph; 260 km/h), much faster than the recommended speed of 85–90 kn (98–104 mph; 157–167 km/h) per the aircraft flight manual. Furthermore, the two parallel runways were being worked by different ATC controllers using different radio frequencies; the controller talking to the SR22 pilot issued traffic advisories regarding the Metroliner as required by regulations, but the other controller did not tell the Metroliner pilot about the approaching SR22, and thus the Metroliner pilot was unaware of the other aircraft and did not know to take evasive action.^[4][5]

References