ASN Wikibase Occurrence # 277182
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Date: | Wednesday 6 April 2022 |
Time: | 04:12 UTC |
Type: | Boeing 767-322ER (WL) |
Owner/operator: | United Airlines |
Registration: | N670UA |
MSN: | 29240/763 |
Year of manufacture: | 1999 |
Total airframe hrs: | 78893 hours |
Engine model: | Pratt & Whitney PW4060 |
Fatalities: | Fatalities: 0 / Occupants: 126 |
Aircraft damage: | None |
Category: | Serious incident |
Location: | about 80nm S of Shannon, Ireland -
Atlantic Ocean
|
Phase: | En route |
Nature: | Passenger - Scheduled |
Departure airport: | Washington-Dulles International Airport, DC (IAD/KIAD) |
Destination airport: | Zürich-Kloten Airport (ZRH/LSZH) |
Investigating agency: | AAIU |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:United Airlines flight UA52, a Boeing 767-322ER, suffered an engine failure while en route from Washington-Dulles International Airport,(IAD/KIAD) to Zürich Airport (ZRH/LSZH).
The flight crew shut down engine no.1 and diverted to Shannon Airport (SNN/EINN), Ireland.
Probable Cause
Migration of the No. 4 bearing Magnetic Chip Detector probe from its housing on the oil pump assembly on the No. 1 engine, followed by a loss of oil through the valve in the Magnetic Chip Detector housing, which remained partially open, due either to debris in the valve or as a result of a partially migrated probe.
Contributory Causes
1. The MCD probe was not in the installed and locked position.
2. The Operator’s MCD maintenance procedures were not followed when maintenance was performed on the MCD probe prior to the occurrence flight.
3. There was no red paint in the alignment grooves on the grip of the MCD probe or on the MCD housing; this was permitted by the Operator’s MCD inspection procedures.
4. The presence of debris within the MCD housing.
5. The MCD probe’s o-ring (primary seal) and Teflon® (secondary) seal were damaged.
Accident investigation:
|
| |
Investigating agency: | AAIU |
Report number: | 2024-001 |
Status: | Investigation completed |
Duration: | 1 year and 10 months |
Download report: | Final report |
|
Sources:
https://www.breakingnews.ie/ireland/transatlantic-jet-diverts-to-shannon-after-engine-failure-off-irish-coast-1286367.html https://www.flightradar24.com/data/aircraft/n670ua#2b67c481 ATC Shannon
History of this aircraft
Other occurrences involving this aircraft
30 May 2018 |
N670UA |
United Airlines |
0 |
near München-Franz Josef Strauss Airport (MUC/EDDM) |
|
unk |
Engine failure |
3 August 2022 |
N670UA |
United Airlines |
0 |
100 kms northwest of Mayo |
|
non |
Inflight smoke |
Revision history:
Date/time | Contributor | Updates |
07-Apr-2022 14:22 |
harro |
Added |
07-Apr-2022 15:22 |
RobertMB |
Updated [Location, Source, Narrative] |
29-Feb-2024 12:06 |
ASN |
Updated [Narrative, Accident report] |
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