Bristow S92 down west of Bergen Norway

[OttoRotate]

Originally Posted by Mitchaa

Not sure this design flaw has ever been fixed by Sikorsky other than increased monitoring -

https://skybrary.aero/accidents-and-...north-sea-2016

https://www.offshore-technology.com/...60853/?cf-view

I believe there were a handful of identical issues going back previously also as they issued an emergency AD just before that accident above.

https://www.ainonline.com/aviation-n...2-emergency-ad

Just a post to highlight previous loss of control events. Most likely unrelated to this event but you never know.

The TRPCS seizing did not have a root cause in the design. RCA determined a supplier failed to hold the upper tolerance on the roller bearing size. Bearings were too large, resulting in high heat during normal operation, burning up grease, and ultimately seizing the unit. This is supported by the fact that the AD was limited to low-hour assemblies. The issue was fully resolved at the supplier, all parts in the suspect population were inspected and dispositioned, and there have been no further recorded incidents or escapes.

Replying to a different topic, the recent FAA Emergency Airworthiness Directive AD #: 2024-05-51. Both Sikorsky and the US Army determined this to be a minor issue requiring no action, but the FAA dissented and forced compliance. I'm curious if anyone here can remember a similar instance with such a dramatic difference in reactions. Regardless, I don't think it played a factor in the thread topic.