What is a significant difference between a 100-hour inspection and an annual inspection?

Annual inspections are indeed more comprehensive than 100-hour inspections. The annual inspection is a thorough examination of the entire aircraft and all of its systems, as specified by the Federal Aviation Administration (FAA) regulations. It requires adherence to specific guidelines laid out in the aircraft's maintenance manual and the application of certified mechanics' expertise to ensure all aspects of the aircraft are compliant and safe for operation.

On the other hand, a 100-hour inspection is primarily intended for aircraft that are used for hire and is focused on certain key areas, but it is not as exhaustive as an annual inspection. The requirement for the annual inspection to be conducted by a certified mechanic is a crucial aspect, reinforcing the need for strict oversight concerning the airworthiness and safety of the aircraft.

The other options do not correctly represent the requirements or characteristics of these inspections. For instance, 100-hour inspections must also be performed by certified mechanics, and both inspections can be logged in a pilot's logbook, not just the 100-hour inspections. Furthermore, the annual inspection requirement applies to all operators of aircraft, not just private pilots, making "A" the only accurate statement regarding the significant difference between the two types of inspections.