Aviation Incident Preliminary Report - National Transportation Safety Board: https://app.ntsb.gov/pdf
Delta Air Lines Inc: http://registry.faa.gov/N668US
Scheduled 14 CFR Part 121: Air Carrier operation of Delta Air Lines
Incident occurred Wednesday, June 07, 2017 in Tokyo, Japan
Aircraft: BOEING 747 451, registration: N668US
Injuries: 324 Uninjured.
This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft incident report.
On June 6, 2017, about 0950 UTC, Delta Air Lines flight 276, a Boeing 747-400, N668US, experienced a loss of power during cruise flight from the No. 1 engine, a Pratt & Whitney PW4056 while in cruise flight over the Pacific Ocean.
The flight crew reported the airplane was level at FL 320 when they heard a thump that was followed by a yawing of the airplane as the exhaust gas temperature increased to redline and then the engine auto shutdown.
The flight crew declared an emergency and deviated from the track as the airplane descended to FL280 where they accomplished the checklist items.
After consultation with dispatch and maintenance, the flight crew diverted back to Tokyo Narita International Airport (NRT), Japan where it landed without further incident.
The post landing examination of the engine revealed metal in the tailpipe and a 360 degree crack in the low pressure turbine case just forward of the rear flange.
The airplane was operating on an instrument flight rules flight plan under the provisions of 14 Code of Federal Regulations Part 121 as an international passenger flight from NRT to Detroit, Michigan.
There were no injuries to the 4 pilots, 14 flight attendants, and 309 passengers on board.
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