Where can the appropriate instructions for inspecting a light twin-engine airplane under Part 135 be found?

The appropriate instructions for inspecting a light twin-engine airplane under Part 135 are found in the Operations Specifications. Operations Specifications (OpSpecs) are provided by the FAA and outline the specific authorizations, limitations, and requirements for the operation of an air carrier. They serve as a formal document that details the specific operational capabilities of the operator, including maintenance and inspection requirements for the aircraft being operated.

Under Part 135, which pertains to commuter and on-demand operations, the OpSpecs will specify the maintenance standards and procedures that must be followed, including inspection protocols. This documentation is critical because it ensures that the operation adheres to safety standards and regulatory compliance, tailored to the specific needs of the operation and the aircraft type.

While the Flight Manual includes operational details and guidance for flight operations, it does not cover the regulatory requirements for inspections. A Regulatory Compliance Guide may provide general guidance but does not replace the specific authorizations found in OpSpecs. The Inspection Authorization Handbook is more focused on the standards for maintenance personnel and the requirements for obtaining Inspection Authorization rather than the actual specifications for operating under Part 135. Therefore, the Operations Specifications are the definitive source for inspection instructions for light twin-engine airplanes under this regulation.