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NTSB Report
September 27, 1991 · Mitsubishi MU-2B-60 · CFFSS
Utica, NY
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 27, 1991
Injury Outcomes
No injuries (2 uninjured)
Location
Utica, NY
Aircraft
Mitsubishi MU-2B-60
Tail Number
CFFSS
Operator
Air 500
Injuries
None
Aircraft Damage
Substantial
NTSB Number
NYC91LA250
DURING CLIMB, ONE OF THE FOUR PROPELLER BLADES ON THE NUMBER TWO ENGINE SEPARATED FROM THE PROPELLER HUB, DAMAGING ANOTHER PROPELLER BLADE AND THE FUSELAGE. SHORTLY THEREAFTER, THE ENGINE SHUT DOWN. THE ROTATIONAL UNBALANCE WAS ACCOMPANIED BY EXTREME VIBRATION AND RESULTED IN DISTORTION AND DAMAGE TO THE ENGINE/COWL ASSEMBLY AND THE WING. THE UPPER PORTION OF THE ENGINE COWL WAS DEFLECTED UPWARD OVER THE WING AT AN ANGLE OF ABOUT 30 DEG, RESULTING IN DISTORTION OF AIRFLOW, BUFFETING, AND DEGRADATION OF ROLL CONTROL. DUE TO EXCESSIVE DRAG, MAXIMUM POWER WAS REQUIRED ON THE NUMBER ONE ENGINE IN ORDER TO CONTROL THE RATE OF DESCENT AND LAND SUCCESSFULLY. A METALLURGICAL EXAMINATION DISCLOSED EVIDENCE OF FATIGUE CRACKING OF THE PROPELLER HUB ARM.
Full Narrative
DURING CLIMB, ONE OF THE FOUR PROPELLER BLADES ON THE NUMBER TWO ENGINE SEPARATED FROM THE PROPELLER HUB, DAMAGING ANOTHER PROPELLER BLADE AND THE FUSELAGE. SHORTLY THEREAFTER, THE ENGINE SHUT DOWN. THE ROTATIONAL UNBALANCE WAS ACCOMPANIED BY EXTREME VIBRATION AND RESULTED IN DISTORTION AND DAMAGE TO THE ENGINE/COWL ASSEMBLY AND THE WING. THE UPPER PORTION OF THE ENGINE COWL WAS DEFLECTED UPWARD OVER THE WING AT AN ANGLE OF ABOUT 30 DEG, RESULTING IN DISTORTION OF AIRFLOW, BUFFETING, AND DEGRADATION OF ROLL CONTROL. DUE TO EXCESSIVE DRAG, MAXIMUM POWER WAS REQUIRED ON THE NUMBER ONE ENGINE IN ORDER TO CONTROL THE RATE OF DESCENT AND LAND SUCCESSFULLY. A METALLURGICAL EXAMINATION DISCLOSED EVIDENCE OF FATIGUE CRACKING OF THE PROPELLER HUB ARM.
Flight
Event TypeAccident
Event Time14:15 EDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMitsubishi MU-2B-60
Tail NumberCFFSS
Aircraft CategoryAir
DamageSubstantial
OperatorAir 500
Operating RulePart 129
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · TPE331-10511M · Turboprop · 715
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 27 · First Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility15 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Weather SourcePILO