What is required to determine if airframe and power plant accessories are functioning per predetermined standards?

To determine if airframe and power plant accessories are functioning according to predetermined standards, a Functional Check Flight is essential. This type of flight is specifically designed to validate the operational capability of the aircraft systems and components after maintenance or modifications. During a Functional Check Flight, various systems are tested under flight conditions to ensure they perform as expected.

Operational Check Flights focus on assessing specific systems or repairs but may not fully encompass all aspects of airframe and power plant accessories. Maintenance Check Flights are more comprehensive, examining general airworthiness and maintenance issues, and a Pre-flight Check is a routine inspection conducted before flight, which does not typically validate the performance of accessories under actual flight conditions. Therefore, the Functional Check Flight is the most appropriate choice for evaluating whether airframe and power plant accessories meet their operational standards.