maxwelg2-
Just glanced thru the
accident investigation report published by the Canadian TSB again. What I read in section 1.18.3.4, if accurate, was rather disturbing.
"Approximately 58 flight hours before the July 2008 incident, on 09 June 2008, a MGB oil filter bowl mounting stud had fractured during removal of the attachment nut. Because a new stud and the proper tools were not immediately available, after consulting with Sikorsky's local field service representative, CHC carried out a temporary repair, installing a self-locking nut on the fractured stud. The self-locking feature of this nut did not fully engage the shortened length of the fractured stud so a hole was drilled in the nut to lockwire it for security. Although Sikorsky's engineering department was not specifically consulted, no technical objections to the temporary repair were presented by the Sikorsky field service representative."
I find it hard to believe that both the CHC maintenance techs and Sikorsky field service reps considered this to be an acceptable repair procedure. Primarily due to the fact that the proper replacement parts/tooling were not immediately available.