Go Back  PPRuNe Forums > Flight Deck Forums > Rumours & News
Reload this Page >

United B777 engine failure

Rumours & News Reporting Points that may affect our jobs or lives as professional pilots. Also, items that may be of interest to professional pilots.

United B777 engine failure

Old 20th Feb 2021, 21:11
  #1 (permalink)  
Thread Starter
 
Join Date: Jan 2008
Location: It used to be an island...
Posts: 233
United B777 engine failure

Reports on Twitter that a UAL 777-200 has had an uncontained engine failure on the way from DEN (Denver, Colorado, USA) to HNL (Honolulu, Hawai'i, USA) and returned safely to DEN. Local news report: https://thepostmillennial.com/colora...nited-airlines

There's a twitter post by user @stillgray with video of the failed engine from in the aircraft that PPRuNe doesn't seem to want to include here...


UAL 777

Ground debris
nicolai is offline  
Old 20th Feb 2021, 21:20
  #2 (permalink)  
 
Join Date: Jun 2019
Location: Milano (Italy)
Posts: 23

The video you mentioned was also posted on YT few moments ago
Grav is offline  
Old 20th Feb 2021, 21:29
  #3 (permalink)  
 
Join Date: Jun 2002
Location: Geneva, Switzerland
Age: 55
Posts: 1,748
Whoops fairly dramatic, both the footage and the debris.
Pretty lucky that no-one was hurt.
atakacs is offline  
Old 20th Feb 2021, 21:42
  #4 (permalink)  
 
Join Date: Jan 2008
Location: downunda
Age: 73
Posts: 121
Looks mostly contained, but perhaps a couple of compressor blades seem missing. There is a gap there when you slow down the video.
flynerd is offline  
Old 20th Feb 2021, 21:46
  #5 (permalink)  
 
Join Date: Feb 2017
Location: In an ivory tower
Posts: 24
The high vibration would support a fan blade issue. See the recent JAL event.

Busy days at PW flight safety department.
armagnac2010 is offline  
Old 20th Feb 2021, 22:32
  #6 (permalink)  
 
Join Date: Jul 2013
Location: Everett, WA
Age: 66
Posts: 3,217
Yep, fan blade release, extreme vibration fails the inlet attachment and it detaches, resultant aero loads and vibration fail most of the rest of the nacelle.

It was during the 777 program that Boeing discovered that the fan blade out vibration levels where considerably higher than what had been previously assumed (presumably aided by the much higher bypass ratio that the 777 engines had compared to previous big fan engines).
Given this even and the fore mentioned JAL event - it would seem that even the higher loads that were used during the 777 design/cert program were not high enough
tdracer is offline  
Old 20th Feb 2021, 22:40
  #7 (permalink)  
 
Join Date: Sep 2007
Location: US
Posts: 3
tower audio

Local radio station KDVR has the tower audio. About what you would expect.

Evidently I'm not allowed to post URLs. Try this instead:
kdvr dot com slash news/local/listen-mayday-call-from-crew-of-united-flight-328/

dumbled0re is offline  
Old 20th Feb 2021, 22:47
  #8 (permalink)  
 
Join Date: Feb 2017
Location: In an ivory tower
Posts: 24
Given this even and the fore mentioned JAL event - it would seem that even the higher loads that were used during the 777 design/cert program were not high enough
Underestimation of the fan blade out loads has been a general trend, apparently. See the 737NG and the Southwest event. Perhaps nobody really wants to carry around that heavy structure to cover a rare event.
armagnac2010 is offline  
Old 20th Feb 2021, 22:53
  #9 (permalink)  
 
Join Date: May 2011
Location: Brazil
Age: 60
Posts: 3
A curious question from an amateur

It looked like the engine was still receiving fuel and burning away happily after the pilot would no doubt have hit the fuel cutoff switch. Why would that be?
Mr Joshua is offline  
Old 20th Feb 2021, 23:28
  #10 (permalink)  
Thread Starter
 
Join Date: Jan 2008
Location: It used to be an island...
Posts: 233
There is also the engine oil, and some hydraulic fluid, out there.
nicolai is offline  
Old 20th Feb 2021, 23:29
  #11 (permalink)  
 
Join Date: Jul 2010
Location: Asia
Posts: 1,228
Who was the engine manufacturer ?
krismiler is offline  
Old 20th Feb 2021, 23:38
  #12 (permalink)  
 
Join Date: Oct 2004
Location: Boston USA
Age: 65
Posts: 75
It might just be some of the epoxy composite containment got hot enough to burn. Plenty air to feed the combustion.
jewitts is offline  
Old 20th Feb 2021, 23:42
  #13 (permalink)  
 
Join Date: Nov 2010
Location: Canada
Posts: 82
ETOPS

Would of been interesting midway between the west coast and the destination Hawaii.
MLHeliwrench is offline  
Old 20th Feb 2021, 23:45
  #14 (permalink)  
 
Join Date: Sep 2006
Location: Midlands
Posts: 124
Pratt & Whitney
Back at NH is offline  
Old 20th Feb 2021, 23:45
  #15 (permalink)  
 
Join Date: Dec 2006
Location: Germany
Posts: 61
Engine oil or maybe hydraulic fluid.
EDML is offline  
Old 20th Feb 2021, 23:45
  #16 (permalink)  
 
Join Date: Mar 2002
Location: Florida
Posts: 0
Some similarity with the South West secondary events. The engine itself does a good job of capturing the high energy blade pieces. Unfortunately some of the blade pieces find their way forward of the containment belts and chew into the soft inlet. with a big slashing effect. If the slash gets very long circumferentially then the cowl becomes limited in vibration. looking at the various video feeds on the nws, the shiny front lip of the cowl can be seen after the initial event still attached. Later on in the flight it is now missing.

It is not good that the engine nacelle (reverser) caught fire. The smoke behind the engine does not match a fuel fire and neither does the flame color in the videos. Quite possibly the non-metallic vanes in the reverser are what is burning. The ability to extinguish this in flight is challenging, but at least the slip stream keeps it away from the wing spar. I would be interested to know how the fire fighters addressed this on the ground.

I suspect there will be a few lessons learned here
lomapaseo is offline  
Old 20th Feb 2021, 23:48
  #17 (permalink)  
 
Join Date: Nov 2010
Location: Canada
Posts: 82
VAS summary video of incident


VAS aviation video
MLHeliwrench is offline  
Old 20th Feb 2021, 23:51
  #18 (permalink)  
 
Join Date: Apr 2007
Location: Lisbon
Age: 50
Posts: 5
I donít see any hole in the casing. Donít see any report of debris hitting the fuselage. Is it really an uncontained failure?
Mike_UEM is offline  
Old 21st Feb 2021, 00:05
  #19 (permalink)  
 
Join Date: Mar 2015
Location: antipodies
Posts: 65
if bits fall off its uncontained!
phylosocopter is offline  
Old 21st Feb 2021, 00:08
  #20 (permalink)  
568
 
Join Date: Aug 2002
Location: Castletown
Posts: 227
TD,

Was the vibration levels the same on all engine types?
Thanks.
568 is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.