ASN Wikibase Occurrence # 206147
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| Date: | Tuesday 13 February 2018 |
| Time: | 13:02 LT |
| Type: |  Boeing 777-222 |
| Owner/operator: | United Air Lines |
| Registration: | N773UA |
| MSN: | 26929/4 |
| Year of manufacture: | 1995 |
| Engine model: | Pratt & Whitney 4077 |
| Fatalities: | Fatalities: 0 / Occupants: 378 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Pacific Ocean ENE of Honolulu, Oahu, HI -
 Pacific Ocean
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | San Francisco International Airport, CA (SFO/KSFO) |
| Honolulu-Daniel K. Inouye International Airport, HI (HNL/PHNL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
United Flight 1175 from San Francisco International Airport, California to Honolulu-Daniel K. Inouye International Airport, Hawaii, experienced an in-flight separation of a fan blade and subsequent loss of the inlet and fan cowls
of the right engine, a Pratt & Whitney PW4077.
About 40 minutes before landing, passengers heard a loud bang and observed smoke coming from the no.2 engine. The cowling had separated and vibrations were felt throughout the aircraft. The flight crew declared an emergency and landed safely at its destination. There were no reported injuries to the incident.
NTSB Probable Cause: the fracture of a fan blade due to P&W's continued classification of the TAI inspection process as a new and emerging technology that permitted them to continue accomplishing the inspection without having to develop a formal, defined initial and recurrent training program or an inspector certification program. The lack of training resulted in the inspector making an incorrect evaluation of an indication that resulted in a blade with a crack being returned to service where it eventually fractured. Contributing to the fracture of the fan blade was the lack of feedback from the process engineers on the fan blades the inspectors sent to the process engineers for evaluation of indications that they had found.
Accident investigation:
 |
|
Sources:
https://app.ntsb.gov/pdfgenerator/ReportGeneratorFile.ashx?EventID=20180213X95634&AKey=1&RType=Prelim&IType=IA
https://www.pprune.org/rumours-news/605391-ua1175-emergency-landing-honolulu.html
https://us.cnn.com/videos/us/2018/02/14/united-emergency-landing-engine-cover-abc-orig-vstop.cnn/video/playlists/top-news-videos/
http://abc7news.com/travel/flight-from-sf-to-hawaii-lands-safely-after-engine-fails-over-pacific/3079027/
http://www.aviationpros.com/news/12401881/ntsbs-initial-probe-finds-likely-cause-of-engine-blowout-on-united-flight-to-hawaii
http://aerossurance.com/safety-management/ndi-failures-b777-pw4077-fbo/
________________
https://www.flightradar24.com/data/flights/ua1175/#106b682f
https://app.ntsb.gov/pdfgenerator/ReportGeneratorFile.ashx?EventID=20180213X95634&AKey=1&RType=HTML&IType=IA
History of this aircraft
Other occurrences involving this aircraft
| 20 July 2010 | N773UA | United Airlines | 0 | In flight over Kansas |  |
non |
| Turbulence | ||||||
Location
Images:
Photo: NTSB
Photo: NTSB
Media:
Weaknesses in procedures, training and facilities at a P&W #nondestructivetesting shop struggling with a backlog of novel inspections of PW4000 fan blades. https://t.co/wshEz8fghN#airworthiness #aviationmaintenance #humanfactors #aviationsafety #flightsafety pic.twitter.com/PzMgWk5hYJ
— Aerossurance (@Aerossurance) July 22, 2020
Another view of the engine on United #UA1175 from San Francisco. Lost engine parts on approach to Honolulu.
— Tom Podolec (@TomPodolec) 14 février 2018
📷@haleylora pic.twitter.com/TwO6Mybgsf
B777 PW4000 FBO incidents: comparison of the three fan blade fracture surfaces. More insight here: https://t.co/mIJ1BCHg33 #flightsafety #aviationsafety pic.twitter.com/UYn94MJMHD
— Aerossurance (@Aerossurance) March 6, 2021
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Feb-2018 23:55 | Geno | Added |
| 14-Feb-2018 05:38 | Iceman 29 | Updated [Source, Embed code] |
| 14-Feb-2018 05:52 | Iceman 29 | Updated [Time, Aircraft type, Registration, Cn, Source, Embed code] |
| 14-Feb-2018 06:14 | Iceman 29 | Updated [Time, Country, Embed code, Photo, ] |
| 14-Feb-2018 07:59 | harro | Updated [Source, Narrative] |
| 14-Feb-2018 18:32 | harro | Updated [Registration, Cn, Nature, Narrative] |
| 14-Feb-2018 18:40 | harro | Updated [Cn, Operator, Departure airport, Narrative] |
| 15-Feb-2018 08:30 | Iceman 29 | Updated [Embed code] |
| 08-Mar-2018 14:34 | harro | Updated [Time, Total occupants, Source, Embed code, Narrative] |
| 08-Mar-2018 17:02 | Iceman 29 | Updated [Source, Embed code, Narrative] |
| 22-Jul-2020 08:25 | Aerossurance | Updated [Destination airport, Source, Narrative] |
| 22-Jul-2020 09:00 | Aerossurance | Updated [Embed code] |
| 21-Feb-2021 07:20 | harro | Updated [Embed code, Narrative, Accident report, Photo] |
| 21-Feb-2021 07:23 | harro | Updated [Embed code, Photo] |
| 06-Mar-2021 11:47 | Aerossurance | Updated [Embed code] |
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