Thirty months after a United Airlines flight out of Denver suffered an engine failure, raining debris down over Broomfield neighborhoods, the NTSB released its final report.
DENVER — Thirty months after a United Airlines flight out of Denver suffered an engine failure, raining debris down over Broomfield neighborhoods, the National Transportation Safety Board on Friday released its final report, outlining what caused the right engine fan blade to malfunction and recommended safety and design changes following the February 21, 2021 incident.
None of the 239 passengers or crew were injured, but a vehicle and home were damaged when part of the engine’s inlet lip skin and fan cowl support beam fell to the ground, according to the NTSB. No one on the ground was injured. Updated inspection procedures were developed to adequately ensure fan cowls are inspected for moisture damage which the FAA said can over time, degrade the cowl strength.
Responding to the emergency over the Denver metro skies, The NTSB report noted the UA 328 flight crew followed the emergency checklist procedures including activating the engine’s dual fire extinguishers but as video shared by passengers noted, the flames continued during the flight. This was due to the extent of the engine damage caused by the fan blade out event.
In identifying further causes behind the fire, the report also pointed to the failure of flange bolts which attach the main gearbox to the engine. Flange bolts attached to the engine that did not initially fail eventually failed resulting “ in the total separation of the “K” flange, which allowed hot, compressed gases to escape the engine core and provided an ignition source in the engine nacelle,” the report said.
The report said the fan blade failure during the February 2021 United Airlines flight was a result of a fatigue crack that began “at the surface of an internal radius in a hollow cavity within the blade,”
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