ASN Aircraft accident Boeing 737-824 (WL) N87513 Denver International Airport, CO (DEN)
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Status:Accident investigation report completed and information captured
Date:Sunday 22 December 2019
Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different
Boeing 737-824 (WL)
Operator:United Airlines
Registration: N87513
MSN: 31621/2655
First flight: 2008-06-19 (11 years 6 months)
Engines: 2 CFMI CFM56-7B26
Crew:Fatalities: 0 / Occupants: 6
Passengers:Fatalities: 0 / Occupants: 165
Total:Fatalities: 0 / Occupants: 171
Aircraft damage: Substantial
Aircraft fate: Repaired
Location:Denver International Airport, CO (DEN) (   United States of America)
Phase: Landing (LDG)
Nature:Domestic Scheduled Passenger
Departure airport:Newark-Liberty International Airport, NJ (EWR/KEWR), United States of America
Destination airport:Denver International Airport, CO (DEN/KDEN), United States of America
A United Airlines Boeing 737-824, registration N87513, operating as flight 2429 from Newark Liberty International Airport in New Jersey, experienced a collapse of the left main landing gear during landing roll on runway 17R at Denver International Airport in Colorado. There were no injuries to the 165 passengers and 6 crew members onboard. The airplane was substantially damaged.

Probable Cause:

Probable Cause: Maintenance personnel’s excessive grinding of the left main landing gear’s aft trunnion pin during its initial overhaul, which caused heat damage to the base metal and led to the fatigue crack that caused the pin to fail during the accident flight. Contributing to the accident was the failure of maintenance personnel to detect the excessive grinding during the initial overhaul and the fatigue crack during the subsequent overhaul.

Accident investigation:

Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 9 months
Accident number: DCA20LA047
Download report: Summary report

Landing gear collapse
Runway mishap


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This map shows the airport of departure and the intended destination of the flight. The line is connecting ADS-B datapoints from Flightradar24.
Distance from Newark-Liberty International Airport, NJ to Denver International Airport, CO as the crow flies is 2559 km (1599 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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