NTSB Identification: MIA87IA141.
The docket is stored on NTSB microfiche number 33741.
Incident occurred Monday, April 20, 1987 in OXFORD, MS
Probable Cause Approval Date: 07/10/1989
Aircraft: BELL 222U, registration: N222HX
Injuries: 3 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE PILOT EXECUTED A PRECAUTIONARY LANDING AFTER HEARING A LOUD BANG AND EXPERIENCING A LOSS OF THE NUMBER 1 ENGINE. POST ACCIDENT EXAMINATION REVEALED THAT THE POWER TURBINE WHEEL BLADES HAD FAILED, AND THE WHEEL PARTS LOGJAMMED AND PENETRATED THE ENGINE CASE. THE BLADE FRACTURES WERE HIGH CYCLE TRANSGRANULAR FAILURES EMINATING FROM THE TRAILING EDGE OF EACH BLADE ROOT. A REVIEW OF FAA SDR RECORDS REVEALED 87 SIMILAR FAILURES. SIX EMERGENCY AIRWORTHINESS DIRECTIVES WERE SUBSEQUENTLY ISSUED.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

TURBINE ASSEMBLY,TURBINE BLADE..FAILURE,TOTAL

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

MAINTENANCE,DESIGN CHANGE..IMPROPER..MANUFACTURER

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ACFT/EQUIP,INADEQUATE DESIGN..MANUFACTURER

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

INADEQUATE CERTIFICATION/APPROVAL,AIRCRAFT..FAA(ORGANIZATION)

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ACFT/EQUIP,INADEQUATE COMPLIANCE DETERMINATION..FAA(OTHER/ORGANIZATION)


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