Final
None
May 14, 2024
N27957 accident at Singapore, Singapore
Boeing 787 — Uncontained engine failure at Singapore, Singapore
DateMay 14, 2024
Tail numberN27957
AircraftBoeing 787
LocationSingapore, Singapore
Phase of flightInitial Climb
OperationPart 121
InjuriesNone
NTSB caseENG24LA014
Probable cause
The uncontained left engine failure was caused by the failure and liberation of the HPT stage 1 aft blade retainer as a result of a fatigue crack in the upper collet radius that originated from a surface connected cluster of Oxide/Carbonitride/Nitride/Carbide (OCNC) particles.
Contributing to the failure of the HPT stage 1 aft blade retainer was an unknown material behavior unique to OCNC clusters in Rene 65 material that are surface connected in highly stressed material that may result in a localized reduction of material fatigue life capability.
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