What is the difference between Release to Service and Certification to Release in maintenance tasks, and who authorizes it?

• A. Release to Service is the official authorization that a task is fit for flight after maintenance; Certification to Release is the inspector's or authorized person's sign-off confirming compliance with all requirements.
• B. Release to Service is the pilot's badge; Certification to Release is the maintenance supervisor's sign-off.
• C. Release to Service is the same as an inspection checklist; Certification to Release is a post-flight report.
• D. They are interchangeable terms.

Answer: (A)

The difference hinges on two linked but distinct actions in making maintenance safe to fly. Certification to Release is the formal sign-off by an inspector or another authorized person confirming that all required maintenance data, checks, inspections, and documentation are complete and meet all regulations and standards. It’s the verification step that everything was done correctly and in accordance with approved procedures.

Release to Service is the actual authorization to put the aircraft back into service. It declares that, based on that verification, the aircraft is fit for flight. In other words, CTR confirms compliance, and RTS grants the permission to operate the aircraft.

So, the inspector/authorized person signs off the Certification to Release, and then the Release to Service is the official authorization that the aircraft may be flown. The two steps ensure both compliance and airworthiness before flight.