Sparks could be seen coming from the left main gear of a United Boeing 737-800, flight UA-2429 from Newark, NJ, to Denver, CO, USA, carrying 171 passengers and 7 crew.
The aircraft landed on runway 17R in Denver. The crew informed emergency services that they thought they could have blown a gear or a tyre and asked that they attend to the aircraft.

The left engine cowl, nose gear, and right main gear were all that were left of the aircraft when it crashed on the runway. Despite appearing to be down, the left main gear could not support the aircraft.
As soon as the plane touched down, passengers noticed sparks coming from the left main gear. Later, they left the ship by the main door on the right and the steps.
According to the airline, there was a mechanical problem with the aircraft upon landing, and all passengers were transported to the terminal by bus.
According to the FAA, the landing gear collapsed, the aircraft incurred unidentified damage, and there were no injuries.The next day, the plane was dragged off the runway while a flat-bed semi truck held the left wing.
The incident was classified as an accident by the NTSB on April 4th, 2020, and an investigation is ongoing.

On Denver’s runway 17R, the aircraft’s left main gear collapsed during the landing roll.
An accident involving a Ryanair B738 in Frankfurt on January 29, 2019, in which a gear strut entered the wing during retraction, may have been linked.
The NTSB released their preliminary report on September 14th 2021, briefly stating (with incorrect passenger and crew numbers):
A left main gear collapse occurred during the landing roll of United Airlines flight 2429, a Boeing 737-800, N87513, on December 22, 2019, at around 7:00 PM MST at Denver International Airport (KDEN), Denver, Colorado.
The 6 crew members and 165 passengers on board sustained no injuries.
The aircraft has significant damage. As part of a regularly scheduled passenger flight departing from Newark Liberty International Airport (KEWR), Newark, New Jersey, the aircraft was operating under 14 Code of Federal Regulations Part 121.
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