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Service Bulletin (SB)
From SKYbrary Wiki
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| Category: | Airworthiness | 
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| Content source: | SKYbrary | 
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| Content control: | SKYbrary |
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| Publication Authority: | SKYbrary |
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Definition
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. In some cases, these may be issued as a Mandatory SB (or MSB) in which case a corresponding Airworthiness Directive (AD) will be issued by the appropriate National Aviation Authority (NAA).