How is time-in-service defined in relation to maintenance records?

Time-in-service refers specifically to the duration an aircraft is in operation during flights, beginning when it takes off and concluding when it lands. This definition is vital for maintenance records as it accounts for the actual time the aircraft is subject to flight conditions, which can impact the wear and tear of various components. Additionally, many maintenance schedules and requirements are based on flight time because it directly influences the reliability and safety standards that must be maintained.

The notion of time-in-service is crucial for maintenance tracking, as it provides a clear and standardized means to determine how long an aircraft has been actively operating. By focusing on flight time, this definition allows maintenance personnel to schedule inspections and checks in accordance with regulatory requirements and manufacturer guidelines that are often tied to hours flown.