Where would you log the side number of an aircraft?

Logging the side number of an aircraft is typically done in the section of the aircraft's maintenance or production control documentation that pertains to tracking aircraft data, such as registration, identification, and maintenance history. The side number serves as a unique identifier for each aircraft within a fleet, making it crucial for maintenance records and operational tracking.

Choosing the first option indicates that the side number would be logged in the appropriate section to ensure that personnel can easily reference the specific aircraft. This is essential for maintenance scheduling, ensuring that all records are up to date, and that any work conducted on the aircraft is accurately matched with its side number for safety and compliance.

The other options, while they may represent different sections or codes within maintenance documentation, do not serve the specific purpose of accurately and appropriately logging the aircraft's side number, which is critical for inventory control and operational effectiveness in managing the fleet.