Which document must be checked to understand the aircraft’s current maintenance status?

The Aircraft Discrepancy Book is the essential document to review when determining an aircraft's current maintenance status. This book serves as a comprehensive record of any discrepancies identified with the aircraft, including mechanical issues, maintenance actions taken, and the status of various systems. It provides a clear overview of any existing problems that could affect the aircraft's performance and safety.

Reviewing the Aircraft Discrepancy Book allows aircrew and maintenance personnel to quickly assess what needs to be addressed before the aircraft is deemed airworthy. It is crucial for ensuring that all known issues are corrected and that the aircraft meets all safety and operational standards before it is put into service.

Other documents, such as the Flight Log and Aircraft Maintenance Manual, serve important functions, but they do not give a complete picture of the ongoing maintenance status. The Flight Log records flight hours and operational details, while the Aircraft Maintenance Manual provides guidelines for maintaining the aircraft but does not document current discrepancies or repairs. The Safety Checklist is primarily a pre-flight tool designed to ensure safety has been evaluated as part of pre-flight preparations but does not reflect the aircraft’s overall maintenance history. Therefore, for assessing current maintenance status, the Aircraft Discrepancy Book is the most relevant resource.