NONE · BOEING 737-824 · 2019-12-23 · Denver, CO, USA
Event
NTSB number
DCA20LA047
Event ID
20200107X35017
Type
Accident
Date
2019-12-23
Location
Denver, CO, USA
Coordinates
39.749443, -105.000801
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
181
Total aboard
181
Aircraft
Make
BOEING
Model
737-824
Registration
N87513
FAR Part
121
Engines
2
Damage
SUBS
Conditions
Light
NITE
Weather
VMC
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.