Incident Saab 340A N146CA, Thursday 21 November 1991
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Date:Thursday 21 November 1991
Time:16:09
Type:Silhouette image of generic SF34 model; specific model in this crash may look slightly different    
Saab 340A
Owner/operator:Comair
Registration: N146CA
MSN: 340A-146
Total airframe hrs:6698 hours
Engine model:GE CT7-5A2
Fatalities:Fatalities: 0 / Occupants: 29
Other fatalities:0
Aircraft damage: Minor
Category:Incident
Location:near Buffalo, NY -   United States of America
Phase: En route
Nature:Passenger - Scheduled
Departure airport:Cincinnati/Northern Kentucky Airport, KY (CVG/KCVG)
Destination airport:Toronto-Pearson International Airport, ON (YYZ/CYYZ)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
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.

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.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: NYC92IA035
Status: Investigation completed
Duration:
Download report: Final report

Sources:

https://ntsb.gov/safety/safety-recs/_layouts/ntsb.recsearch/Recommendation.aspx?Rec=A-91-129

Revision history:

Date/timeContributorUpdates
20-Jan-2018 18:55 harro Added
20-Jan-2018 18:56 harro Updated [Narrative]

Corrections or additions? ... Edit this accident description

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