What happened
A charter flight operated for the Military Air Command departed from Monterey Airport, California, destined for Columbus, Georgia, with an intended stop at Ardmore Municipal Airport, Oklahoma. The aircraft, carrying five crew members and 93 US soldiers, proceeded without incident until the arrival phase in Oklahoma. During the night approach under marginal weather conditions, the crew initially attempted an ADF instrument approach to runway 08 but subsequently transitioned to a visual approach for runway 30.
While descending toward runway 30 amidst poor visibility, the pilot-in-command experienced a sudden heart attack. This medical emergency led to an uncontrolled descent with a slight right bank. The aircraft type impacted the ground approximately 1.5 miles short of the runway, resulting in the total disintegration of the airframe. The accident resulted in 80 fatalities (comprising all five crew members and 75 passengers) and 18 serious injuries. Three survivors later succumbed to their wounds.
Findings
The investigation concluded that the primary cause was the sudden incapacitation of the pilot-in-command due to coronary insufficiency during a critical phase of the visual, circling approach. Investigators also identified that the pilot had an existing medical history of diabetes and cardiovascular disease, conditions that would have prevented him from legally holding a first-class medical certificate. It was further determined that the pilot had intentionally provided false information on his medical certification application.