Incident Overview
United Airlines Flight 227 was operating a scheduled service from New York-LaGuardia to San Francisco. The flight path included scheduled stops at Cleveland, Chicago, Denver, and Salt Lake City. After departing Denver at 16:54, the aircraft climbed to its assigned cruising altitude of FL310 before beginning its descent for the final destination.
Approach and Impact
At 17:38, the flight initiated its descent for Salt Lake City. Radar vectors guided the aircraft until it was handed off to Approach Control. At 17:47, the approach controller cleared the aircraft for an ILS runway three-four left approach. The pilot reported slowing to two-fifty knots at ten thousand feet with the runway in sight, requesting to cancel and standby for traffic. Control was subsequently transferred to the tower, which issued landing clearance at 17:49:40.
During the final approach, the aircraft crossed the outer marker more than 2,000 feet above the ILS glide slope. The descent rate exceeded 2,000 ft/min, approximately three times the airline's recommended limit for landing approaches. Although the first officer attempted to apply power, the captain intervened and stopped him. Power was applied too late to arrest the rapid descent.
The airplane touched down 335 feet short of the threshold of runway 34L. The main landing gear separated upon impact, causing the aircraft to slide onto the runway. Severe upward and rearward forces from the right main gear assembly ruptured fuel lines and generator leads on the right side of the fuselage between stations 1030 and 1130. Fire ignited due to sparks from the fuselage scraping the runway or severed electrical leads.
Casualties
The accident resulted in significant loss of life and injuries. Thirteen passengers were uninjured, while 35 individuals sustained wounds. Tragically, 43 other occupants were killed in the incident.