ASN logo
ASN Wikibase Occurrence # 204761
Last updated: 14 June 2020
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:21-NOV-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
C/n / msn: 340A-146
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:International Scheduled Passenger
Departure airport:Cincinnati/Northern Kentucky Airport, KY (CVG/KCVG)
Destination airport:Toronto-Pearson International Airport, ON (YYZ/CYYZ)
Investigating agency: NTSB
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.

Sources:

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

Safety recommendations:

Safety recommendation A-91-129 issued 1 February 1992 by NTSB to FAA
Safety recommendation A-91-129 issued 2 January 1992 by NTSB to FAA
Safety recommendation A-91-130 issued 1 February 1992 by NTSB to FAA
Safety recommendation A-91-130 issued 2 January 1992 by NTSB to FAA

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


Images:

Photo of N146CA courtesy AirHistory.net


Detroit - Metropolitan Wayne County (KDTW / DTW)
4 June 1991; (c) Danny Grew

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