Serious incident Boeing 777-222 N773UA,
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ASN Wikibase Occurrence # 206147
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Date:Tuesday 13 February 2018
Time:13:02 LT
Type:Silhouette image of generic B772 model; specific model in this crash may look slightly different    
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)
Destination airport: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:
Investigating agency: NTSB
Report number: DCA18IA092
Status: Investigation completed
Download report: Final report


History of this aircraft

Other occurrences involving this aircraft
20 July 2010 N773UA United Airlines 0 In flight over Kansas non



Photo: NTSB

Photo: NTSB


Revision history:

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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