Final answer:
Aircraft operators are responsible for keeping maintenance records up to date, with aviation maintenance technicians typically handling the task. They must comply with regulations set forth by authorities like the FAA.
Step-by-step explanation:
The entity responsible for ensuring that all of the aircraft maintenance records are kept up to date is typically the aircraft operator or owner.
However, the actual task of updating and maintaining these records is usually delegated to the certified aviation maintenance technicians (AMTs) or engineers who perform the maintenance duties. Airlines and other large operators may have dedicated departments for maintaining these records.
In addition to this, the task is heavily regulated by authorities such as the Federal Aviation Administration (FAA) in the United States, or equivalent civil aviation bodies in other countries, which set forth the regulations that govern how records must be kept. It is crucial for both safety and legal reasons that these records are accurate, complete, and promptly updated after each maintenance action.