Final
None
Oct 26, 2016
N855NW accident at Seattle, WA
Airbus A330 223 — Powerplant sys/comp malf/fail at SEA (Seattle, WA)
DateOct 26, 2016
Tail numberN855NW
AircraftAirbus A330 223 · Airbus A330 · A332
LocationSEA — Seattle, WA
Phase of flightInitial Climb
OperationPart 121
InjuriesNone
NTSB caseENG17IA003
Probable cause
A No. 1 engine fire caused by a fuel manifold supply line high cycle fatigue crack which led to a fuel leak that subsequently ignited on hot engine case surfaces. The fatigue crack originated and progressed due to elevated fuel manifold assembly vibration levels. Engine vibration testing identified a combustor tone that excites a natural (resonant) frequency of the fuel manifolds at specific engine speeds on Pratt & Whitney PW4000-94 and -100 inch fan series engines that feature a TALON II combustor.
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