What does the 100-hour inspection pertain to?

The 100-hour inspection specifically pertains to a limited inspection that is required for certain aircraft, particularly those used for passenger transport and hire. This type of inspection is mandated by aviation regulations to ensure that aircraft are safe and remain airworthy after a specified number of flight hours, which in this case is 100 hours of operation.

This inspection includes a thorough examination of critical components and systems of the aircraft to check for any wear and tear, necessary repairs, and overall compliance with safety standards. While general maintenance checks may encompass a wide range of aircraft assessments, and emergency safety checks are focused on addressing immediate safety issues, the 100-hour inspection is more about ensuring ongoing safety and compliance related to passenger transport operations. A routine yearly certification typically refers to a broader timeframe and scope than the specificity of the 100-hour inspection. Therefore, the option correctly identifies the focused nature of the 100-hour inspection relevant to passenger transport aircraft.