When performing an annual inspection on a rotorcraft, when is a maintenance manual required?

The correct choice emphasizes the importance of following regulatory requirements and adherence to the manufacturer's specifications when conducting maintenance activities, including annual inspections on rotorcraft.

In this context, the requirement for a maintenance manual is mandated based on the type certificate data sheet. The data sheet outlines specific maintenance and inspection criteria that are necessary for the safe operation of the aircraft. When an aircraft is type-certified, the manufacturer provides detailed instructions in a maintenance manual that must be followed to ensure that all components are maintained properly and that safety standards are met.

While there might be scenarios where maintenance manuals are beneficial or even essential, such as during periods of critical repairs or when partaking in specific inspection programs, the foundational requirement as per the aircraft’s type certificate emphasizes their use. This ensures compliance with Federal Aviation Administration (FAA) regulations and promotes an understanding of the specific maintenance needs that arise from the unique characteristics of the rotorcraft.