United Airlines Flight 328

2021 B777-200 airliner incident with PW4000-112 engine failure over Broomfield, CO, USA

United Airlines Flight 328 was a scheduled flight from Denver International Airport in Denver, Colorado, to Daniel K. Inouye International Airport in Honolulu, Hawaii. On February 20, 2021, the Boeing 777-222 (registered N772UA) operating the route suffered an engine failure while flying over Broomfield, Colorado. The airplane then returned to Denver International Airport.[1][2]

United Airlines Flight 328
United Airlines - N772UA - Boeing 777-200 - San Francisco International Airport-0406 (cropped).jpg
N772UA, the aircraft involved in the incident, photographed in 2014
DateFebruary 20, 2021 13:08 MST (2021-02-20UTC20:08Z)[1]
SummaryNominally contained engine failure with parts departing aircraft and subsequent emergency landing; under investigation
SiteOver Broomfield, Colorado, U.S.
39°55′44″N 105°03′18″W / 39.929°N 105.055°W / 39.929; -105.055Coordinates: 39°55′44″N 105°03′18″W / 39.929°N 105.055°W / 39.929; -105.055
Aircraft typeBoeing 777-222[a]
OperatorUnited Airlines
IATA flight No.UA328
Call signUnited 328
Flight originDenver International Airport (DIA), Denver, Colorado
DestinationDaniel K. Inouye International Airport (HON), Honolulu, Hawaii
Survivors241 (all)
Ground casualties
Ground injuries0

The failure to the engine caused a fire in the engine damage to the aircraft's body.[3]


The incident aircraft, N772UA, is a Boeing 777 which flies for United Airlines. It was built in November 1994 and given to United Airlines in September 1995.[4] At first, the aircraft was a part of a test to approve its entry to fly commercially.[4]


As of July 25, 2021, the National Transportation Safety Board (NTSB) is looking into the incident. Debris was collected. The NTSB found that two blades on the engine were broken and the damage done to be the same as metal fatigue.[5][6]


  1. The airliner was a Boeing 777-200 model; Boeing assigns a unique code for each company that buys one of its airliners, which is applied as an infix to the model number at the time the aircraft is built, hence "777-222" designates a 777-200 built for United Airlines (customer code 22).


  1. 1.0 1.1 Petchenik, Ian (21 February 2021). "United UA328 suffers engine failure departing Denver". FlightRadar24. Retrieved 28 February 2021.
  2. "Investigative Update: United Airlines Flight 328 Boeing 777 Engine Incident". www.ntsb.gov. National Transportation Safety Board. Retrieved February 22, 2021.{{cite web}}: CS1 maint: url-status (link)
  3. "FAA Statement on Pratt & Whitney Engine Emergency Airworthiness Directive". Federal Aviation Administration. February 24, 2021.{{cite web}}: CS1 maint: url-status (link)
  4. 4.0 4.1 Birtles, Philip (1998). Boeing 777: Jetliner for a New Century. MBI Publishing Company. ISBN 978-0-7603-0581-2.
  5. "Damage to fan blade in United Boeing 777 engine consistent with metal fatigue -NTSB". Reuters. Reuters Staff. 2021-02-23. Retrieved 2021-02-23.
  6. Frost, Jamie; Freed, David; Shepardson, Laurence (2021-02-23). "Boeing engine blowouts investigated as older 777s are suspended". Reuters. Retrieved 2021-02-23.