How frequently must an aircraft undergo a 100-hour inspection?

The correct answer specifies that an aircraft must undergo a 100-hour inspection every 100 hours of flight time specifically for aircraft that are used for hire. This requirement is outlined in Federal Aviation Administration (FAA) regulations, which mandate regular inspections to ensure safety and airworthiness for aircraft operating commercially. The 100-hour inspection is a crucial maintenance check that allows mechanics to identify any potential issues that could compromise safety during flight operations.

This inspection is particularly focused on aircraft that are engaged in operations for hire, such as air taxis or charter services, as these aircraft tend to accumulate flight hours more rapidly and are exposed to higher operational stresses. Ensuring that these aircraft are regularly inspected helps in maintaining safety standards for both the passengers and crew.

Other choices do not align with the specific regulatory requirements established for flight operations. For example, an annual inspection does not encompass the necessary frequency of the 100-hour inspection for aircraft operating commercially, and there's no standard practice for inspecting solely after a specific number of flights or only in the first year of service. Thus, adherence to the 100-hour inspection for hire operations is pivotal in aviation maintenance practices.