How a Service Bulletin is born…

A good example of how a mechanical failure leads to a manufacturer’s Service Bulletin (SB) being issued:

Accident: NTSB Accident Brief of Accident

Which leads to…

Service Bulletin: Robinson R44 Service Bulletin SB-86 – Rotor RPM Sender Magnets

Side note – good job on the safe landing!

Service Bulletin’s are not mandatory* – that would be a FAA Airworthiness Directive, which often evolve from SBs.

* See Mike’s comment below

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