If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user
Service Bulletin (SB)
From SKYbrary Wiki
(Redirected from Service Bulletin (SB))
A Service Bulletin is the document used by manufacturers of aircraft, their engines or their components to communicate details of modifications which can be embodied in aircraft. If an available modification is judged by the manufacturer to be a matter of safety rather than simply product improvement, then these would be issued as an Alert SB in which case a corresponding Airworthiness Directive (AD) would usually then be issued by the appropriate NAA.