ASN Wikibase Occurrence # 314221
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| Date: | Wednesday 7 June 2017 |
| Time: | 09:50 LT |
| Type: |  Boeing 747-451 |
| Owner/operator: | Delta Air Lines |
| Registration: | N668US |
| MSN: | 24223/800 |
| Year of manufacture: | 1990 |
| Engine model: | P&W PW4000 SER |
| Fatalities: | Fatalities: 0 / Occupants: 326 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | NE of Japan -
 Pacific Ocean
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Tokyo-Narita Airport (NRT/RJAA) |
| Detroit-Metropolitan Wayne County Airport, MI (DTW/KDTW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On June 7, 2017, about 0950 universal coordinated time, Delta Air Lines flight 276, a Boeing 747-451 airplane, N668US, experienced a loss of power from the No. 1 engine, a Pratt & Whitney (P&W) PW4056, while in cruise flight over the Pacific Ocean northeast of Japan. The pilots reported that the airplane was level at FL 320 on the G344 airway between the CUTEE and CARTO waypoints when there was a sudden thump and the airplane yawed to the left. The pilots further reported that following the thump; the No. 1 engine's EPR [engine pressure ratio] and N1 were decreasing, the EGT [exhaust gas temperature] was increasing, and the oil quantity indicated about 9 quarts. The airplane was stabilized with the rudder and as the engine's EGT limit was reached, the engine's thrust lever was retarded to idle. The Engine Failure Checklist was accomplished and the VNAV drift down procedure was initiated while turning 45° off track to the right. The pilots declared an emergency and the airplane descended to FL 280. After consulting with Delta Air Lines' dispatch and maintenance at Atlanta, Georgia, it was determined that the airplane would divert back to Tokyo Narita International Airport (NRT), Tokyo, Japan. The pilots reported that about 30 minutes prior to landing, they jettisoned fuel to reduce the airplane's weight to below the maximum landing weight. The airplane landed at NRT without further incident.
Accident investigation:
 |
|
Sources:
NTSB ENG17IA026
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Jun-2023 14:23 | ASN Update Bot | Added |
| 02-Jun-2023 14:25 | harro | Updated |
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