Aviation news release 2009

TSB # A01/2009

THE TRANSPORTATION SAFETY BOARD OF CANADA HAS IDENTIFIED A BROKEN MAIN GEARBOX FILTER BOWL ASSEMBLY MOUNTING STUD ON THE COUGAR HELICOPTER SIKORSKY S92-A

(Gatineau, Quebec, March 20, 2009) - Shortly after beginning the initial wreckage examination today, as part of the Transportation Safety Board of Canada (TSB) investigation into the March 12, 2009 accident of a Cougar Helicopter Sikorsky S92 A off the coast of St. John�s, Newfoundland and Labrador, the TSB immediately informed Transport Canada (TC), the National Transportation Safety Board (NTSB) and the Federal Aviation Administration (FAA) that they had found a broken main gearbox filter bowl assembly mounting stud.

On January 28, 2009, the manufacturer Sikorsky Aircraft Corporation had issued an Alert Service Bulletin (ASB92-63-014) indicating that the main gearbox filter bowl assembly mounting titanium studs should be replaced with steel mounting studs. This one-time modification was to be accomplished within the next 1250 flight hours or within one year of the issue date of the ASB, whichever occurred first.

In light of TSB�s discovery, the FAA will be issuing an emergency Airworthiness Directive stipulating that all operators of Sikorsky S92 A helicopters worldwide must install the improved studs in accordance with the existing ASB, before conducting any other flights.

Mike Cunningham, Investigator-in-Charge, will be available for comments in English by phone only between 4:30 p.m. and 6:30 p.m. Newfoundland and Labrador time.

Charles Laurence, Operations Team Lead, will be available for comments in French by phone only between 4:30 p.m. and 6:30 p.m. Newfoundland and Labrador time.

The TSB is an independent agency that investigates marine, pipeline, railway and aviation transportation occurrences. Its sole aim is the advancement of transportation safety. It is not the function of the Board to assign fault or determine civil or criminal liability.

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To schedule an interview, please contact:
Julie Leroux
Media Relations
Transportation Safety Board of Canada
Telephone: (613) 290-9875


The TSB is an independent agency that investigates marine, pipeline, railway and aviation transportation occurrences. Its sole aim is the advancement of transportation safety. It is not the function of the Board to assign fault or determine civil or criminal liability.

For more information, contact:
Transportation Safety Board of Canada
Media Relations
Telephone: 819-994-8053
Email: media@tsb.gc.ca