Service Bulletins are:

Service Bulletins are:

• A. Issued by FAA; mandatory
• B. Issued by NTSB; recommended
• C. Issued by manufacturer; recommended
• D. Issued by manufacturer; not mandatory but recommended

Answer: (D)

Service Bulletins are notices from the aircraft’s manufacturer about potential safety or reliability issues and describe recommended inspections, modifications, or procedures to address them. They are not issued by the FAA or other regulatory bodies, and they aren’t automatically mandatory. Compliance is optional unless an Airworthiness Directive from the FAA requires it or an operator policy mandates it. So a Service Bulletin is best understood as a manufacturer’s recommendation that may become mandatory only if tied into an AD or adopted by the operator.

Service Bulletins are notices from the aircraft’s manufacturer about potential safety or reliability issues and describe recommended inspections, modifications, or procedures to address them. They are not issued by the FAA or other regulatory bodies, and they aren’t automatically mandatory. Compliance is optional unless an Airworthiness Directive from the FAA requires it or an operator policy mandates it. So a Service Bulletin is best understood as a manufacturer’s recommendation that may become mandatory only if tied into an AD or adopted by the operator.