What document must be completed after performing maintenance on an aircraft?

Completing a maintenance log entry after performing maintenance on an aircraft is crucial for several reasons. This document serves as an official record that details the nature of the maintenance performed, any parts that were replaced or repaired, the date of the work, and the individual or team that completed the maintenance.

This record-keeping is essential for maintaining airworthiness, as it provides a history of the aircraft's maintenance activities. It enables future mechanics or inspectors to quickly assess the condition of the aircraft and understand the maintenance history, which is vital for ongoing safety and compliance with regulatory requirements.

In contrast, while a service bulletin may contain important information about recommended maintenance or modifications, it is not an official record of work performed. A pre-flight checklist is used prior to flight to ensure safety and readiness but does not document maintenance. The pilot's operating manual provides operational guidance for the aircraft but does not relate to maintenance records. Therefore, the maintenance log entry is the critical document required to ensure that all maintenance activities are properly recorded and traceable.