What type of inspection can a turbine rotorcraft operator additionally select aside from the inspection programs under 14 CFR Section 91.409(e)?

The correct answer is the annual inspection. Operators of turbine rotorcraft have the flexibility to select an annual inspection as a comprehensive maintenance option. An annual inspection adheres to a more thorough checklist and is completed only once a year, making it suitable for operators who wish to ensure a high level of airworthiness over an extended period. This inspection is more detailed than some other types, providing a complete assessment of the aircraft’s systems and structures.

While the 100-hour inspection is mandatory for aircraft used for hire and is applicable for certain operational scenarios, it is not an additional option specifically available to turbine rotorcraft operators beyond the inspection programs established under the mentioned regulation. The progressive inspection, on the other hand, allows for maintenance items to be addressed throughout the year in a segmented manner, but it is generally not an option for turbine rotorcraft operators seeking additional inspection choices; rather, it is a system designed for larger, more complex aircraft fleets. Pre-flight inspections are typically brief and primarily focus on ensuring the aircraft is ready for immediate flight rather than being a formal, comprehensive inspection program.