What is the primary controlling document for maintenance and inspection of aircraft under 14 CFR Part 135?

The primary controlling document for maintenance and inspection of aircraft under 14 CFR Part 135 is the operator's FAA-approved manual. This manual outlines the specific maintenance and operational procedures required to comply with the regulations set forth in Part 135, which are designed for commuter and on-demand operations.

The operator's FAA-approved manual serves as the definitive guide that operations must follow for ensuring airworthiness and safety. It contains policies, procedures, and standards that the operator must adhere to, including those concerning maintenance schedules, inspections, and training requirements.

While the other options may provide valuable information or guidelines, they do not hold the same regulatory authority as the operator's FAA-approved manual. For instance, AC 43.13-2B provides advisory guidance for acceptable methods and practices but is not mandatory. The aircraft manufacturer's service manual offers specifications and maintenance procedures specific to the aircraft but may not encompass all operational procedures required for compliance with Part 135. Similarly, the maintenance technician's handbook could offer useful insights, but again, it does not serve as the controlling document mandated by the FAA for Part 135 operations.

Thus, the operator's FAA-approved manual is essential for compliance and safety in the context of aircraft maintenance and inspection under this regulation.