What should be included in an aircraft's maintenance schedule?

An aircraft's maintenance schedule is essential for ensuring the safety and airworthiness of the aircraft, and it must adhere to specific regulations and standards. Including the annual inspection and compliance with regulations in the maintenance schedule is vital because these inspections are mandated by aviation authorities to ensure that all aircraft meet safety and performance standards.

The annual inspection typically involves a comprehensive assessment of the aircraft's systems, structures, and components, ensuring that everything is functioning correctly and meets the regulatory requirements. Compliance with regulations not only safeguards the aircraft’s operation but also helps in documenting maintenance history, thereby enhancing the safety record and longevity of the aircraft.

In contrast, the other options fall short of addressing the comprehensive nature of a proper maintenance schedule. Monthly engine checks alone do not encompass all the necessary inspections and maintenance required to keep an aircraft safe and airworthy. Similarly, routine pilot training updates and inspections conducted only before long flights do not provide a thorough framework for ongoing maintenance needs that ensure the aircraft is always ready for safe operation. A well-rounded maintenance schedule must include regular and scheduled inspections in accordance with regulatory guidance.