Where can you find the operating conditions that mandate a 100-hour inspection?

The operating conditions that mandate a 100-hour inspection can be found in 14 CFR part 91. This section of the Code of Federal Regulations outlines general operating and flight rules, including maintenance requirements for aircraft operating under 14 CFR part 91. Specifically, it details the intervals for inspections necessary for aircraft that are used for hire or rental, which includes the stipulation for a 100-hour inspection.

While other options may contain relevant information regarding inspections and regulations, part 91 specifically addresses the operational context in which such inspections are required, making it the most appropriate source for understanding the 100-hour inspection criteria. 14 CFR part 43, for example, involves maintenance, preventive maintenance, and alterations, but does not focus specifically on the operational conditions triggering the inspections. Similarly, an aircraft manufacturer's manual contains manufacturer-specific maintenance recommendations but may not necessarily align with the regulatory requirements set forth in the CFR. Federal Aviation Regulations is a broad term that encompasses multiple parts, thus not indicating the specific section where the 100-hour inspection conditions are defined.