Boeing grounder B777 med PW4000 motoren - CNN

Omtrent samtidig skjedde et tilsvarende PW4000 motorhavari på en B747 i Nederland. (Red.)

Engine debris rained over a mile across a Denver suburb. Now Boeing recommends suspending its 777s with that engine

(CNN)Kieran Cain was playing basketball with his kids Saturday afternoon at an elementary school in greater Denver when he heard what sounded like a sonic boom and looked up.

"We could see there was a giant black cloud of smoke high up in the sky, immediately followed by, you know what looked like pieces of the aircraft," Cain told CNN. "Basically a shower of things that were falling out of the sky."

About 10,000 feet above, Travis Loock heard the same boom, but coming from the plane he was in -- United Flight 328. Just minutes after taking off for Honolulu, the engine failed. As the plane returned to Denver International Airport, it dropped more engine debris through the roofs of homes and into yards.

In this aerial view from a drone, people walk past a home with a hole in the roof from falling debris from an airplane engine on February 20 in Broomfield, Colorado.

The National Transportation Safety Board (NTSB) said Sunday an initial examination of the Pratt & Whitney PW4077 engine from United Airlines Flight 328 showed that two fan blades were fractured and the remaining blades exhibited damage "to the tips and leading edges."

These are preliminary findings and should not be taken as conclusive of what went wrong Saturday, but they are still significant.

Boeing has recommended suspending the use of 777s that have a Pratt & Whitney 4000 engine, and United Airlines has already pulled them following the incident. Both the Federal Aviation Administration (FAA) and the NTSB are investigating.

Date:	20-FEB-2021
Time:	c. 12:55
Type:	Boeing 777-222
Owner/operator:	United Airlines
Registration:	N772UA
C/n / msn:	26930/5
Fatalities:	Fatalities: 0 / Occupants: 241
Other fatalities:	0
Aircraft damage:	Unknown
Location:	near Denver International Airport (DEN/KDEN), Denver, CO -    United States of America
Phase:	Take off
Nature:	Passenger - Scheduled
Departure airport:	Denver International Airport, CO (DEN/KDEN)
Destination airport:	Honolulu-Daniel K. Inouye International Airport, HI (HNL/PHNL)
Investigating agency:	NTSB

Narrative:
United Airlines flight UA328, a Boeing 777-200, experienced an uncontained no. 2 engine failure (PW4077) after departure from Denver International Airport (DEN/KDEN), Colorado, USA.
The aircraft took off from runway 25 at 13:04 hours local time (20:04 UTC), bound for Honolulu, Hawaii.
About four minutes after takeoff the right hand engine experienced an uncontained failure. Parts of the engine inlet cowl and fan cowls separated and came down in a residential area of Broomfield.
The flight circled back and landed safely on runway 26 at 13:28 hours.

There are no reported injuries onboard the aircraft or on the ground.