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NTSB Report
April 20, 1987 · Bell 222U · N222HX
Oxford, MS
Overview
Report Status
Preliminary report
Event Type
Incident
Date
April 20, 1987
Injury Outcomes
No injuries (3 uninjured)
Location
Oxford, MS
Aircraft
Bell 222U
Tail Number
N222HX
Operator
Memphis Medical Center
Injuries
None
Aircraft Damage
Minor
NTSB Number
MIA87IA141
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time13:00 CDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 222U
Tail NumberN222HX
Aircraft CategoryHeli
DamageMinor
OperatorMemphis Medical Center
Operating RulePart 91
Engines2
Engine TypeTurboshaft
Engine DetailsLycoming · LTS-101-75001 · Turboshaft · 750
Seats7
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 37 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind310° @ 7 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point57
Altimeter30.00 inHg
Observation Time18:19
Weather SourceWFAC