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NTSB Report
November 21, 1991 · Saab-Fairchild SF-340A · N146CA
Buffalo, NY
Overview
Report Status
Probable Cause
Event Type
Incident
Date
November 21, 1991
Injury Outcomes
No injuries (29 uninjured)
Location
Buffalo, NY
Aircraft
Saab-Fairchild SF-340A
Tail Number
N146CA
Operator
Com Air
Injuries
None
Aircraft Damage
Minor
NTSB Number
NYC92IA035
THE FLIGHT CREW DETECTED VIBRATION COMING FROM THE RIGHT PROPELLER AND MADE A DECISION TO SHUT THE ENGINE DOWN. DURING THE SHUTDOWN PROCESS THE PROPELLER SEPARATED FROM THE AIRPLANE. EXAMINATION OF BOTH PORTIONS OF THE FAILED PROPELLER SHAFT REVEALED THE SHAFT FAILED DUE TO FATIGUE. METALLURGICAL EXAMINATION FOUND A SLAG INCLUSION JUST BELOW THE FRACTURE SURFACE. THIS DEFECT OCCURRED DURING THE MELTING OF THE ORIGINAL INGOT.
NTSB Probable Cause
A FATIGUE FRACTURE ON THE PROPELLER SHAFT, THAT ORIGINATED AT A SUBSURFACE SLAG INCLUSION, WHICH REMAINED IN THE MATERIAL USED TO MANUFACTURE THE SHAFT.
Full Narrative
THE FLIGHT CREW DETECTED VIBRATION COMING FROM THE RIGHT PROPELLER AND MADE A DECISION TO SHUT THE ENGINE DOWN. DURING THE SHUTDOWN PROCESS THE PROPELLER SEPARATED FROM THE AIRPLANE. EXAMINATION OF BOTH PORTIONS OF THE FAILED PROPELLER SHAFT REVEALED THE SHAFT FAILED DUE TO FATIGUE. METALLURGICAL EXAMINATION FOUND A SLAG INCLUSION JUST BELOW THE FRACTURE SURFACE. THIS DEFECT OCCURRED DURING THE MELTING OF THE ORIGINAL INGOT.
Flight
Event TypeIncident
Event Time16:09 EST
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSaab-Fairchild SF-340A
Tail NumberN146CA
Aircraft CategoryAir
DamageMinor
OperatorCom Air
Operating RulePart 135
Engines2
Engine TypeTurboprop
Engine DetailsGe · CT7-5A2 · Turboprop · 1735
Seats36
People & Injuries
Injury SummaryNo injuries (29 uninjured)
Fatal0
Serious0
Minor0
Uninjured29
Total29
Crew 1Age 38 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind120° @ 6 kt
Visibility20 sm
CeilingBroken clouds 2100 ft
Temperature / Dew Point46 / 41 C
Altimeter0
Observation Time20:50
Weather SourceWFAC