For an appliance major alteration, which type of data can be used without further approval?

The correct answer is that the manufacturer's manual can be used without further approval for an appliance major alteration. This is because the manufacturer's manual is typically recognized as the authoritative guide for the equipment, detailing specifications, procedures, and standards that have been established by the manufacturer. When performing major alterations, it's crucial to follow the guidelines set forth by the manufacturer to ensure compliance with safety and performance requirements.

In the context of regulatory standards, the FAA considers the manufacturer's manual to be a reliable source of technical data. This means it can be utilized directly during the alteration process without necessitating additional approval from the FAA, provided the work is carried out within the parameters specified in the manual.

Advisory Circulars, while they provide valuable guidance and best practices regarding regulatory compliance and safety, do not carry the same authoritative weight as manufacturer's manuals for specific alteration procedures. They are intended to support the understanding of regulations and may provide information on acceptable practices, but using them as the sole basis for major alterations would typically require further approval or verification, as they are not specifically tailored to a particular appliance.

FAA Advisory Information generally serves as a means to inform the aviation community about useful practices or emerging issues in aviation safety but does not constitute a primary source of technical data necessary for alterations.