Inspections for a Cessna 421B operated as a 14 CFR Part 91 airplane are conducted according to which regulation?

The correct regulation for conducting inspections on a Cessna 421B operated under 14 CFR Part 91 is found in 14 CFR Part 91, §91.409. This section specifically outlines the requirements for aircraft inspections, including the frequency and types of inspections that must be performed for aircraft used in private operations, such as those governed by Part 91.

In the context of this regulation, it details the necessity for annual inspections and the conditions under which a progressive inspection program may be employed, which are essential for ensuring the airworthiness of the aircraft and compliance with federal standards.

The reference to other options illustrates that while they relate to aircraft maintenance and regulations, they do not govern the overall inspection requirements as directly as Part 91, §91.409 does. For instance, Appendix D of Part 43 outlines specific maintenance tasks and standards, but not the routine inspection obligations for private operators. Similarly, §43.16 discusses airworthiness limitations but is not solely focused on inspection intervals or types pertinent to flight operations under Part 91. Part 147 pertains to schools and training, which is outside the scope of operational inspection requirements.

Thus, focusing on Part 91, §91.409 gives the most accurate and relevant