For whom are maintenance records specifically required to indicate return to service?

Maintenance records are specifically required to indicate return to service for the owner or operator of the aircraft. This requirement is crucial because it ensures that the owner or operator has documentation that verifies the aircraft was properly maintained and meets the applicable airworthiness standards before being returned to service.

In aviation, maintaining accurate and complete records of maintenance actions is essential for ensuring safety and compliance with regulations. These records provide a historical account of the aircraft's maintenance history, which is vital for tracking parts and repairs. For the owner or operator, having these records helps in understanding the condition of the aircraft, enabling informed decisions about operation and maintenance.

While the aviation authority does require some documentation, their main interest lies in compliance with regulations rather than the detailed maintenance history of individual aircraft. Insurers may benefit from maintenance records for assessing risk, but they are not the primary audience for return to service documentation. Similarly, while pilots must be conscious of an aircraft's status and maintenance, the direct requirement for return to service documentation is placed on the owner or operator.