(a) Except as provided in this section and §43.17, no person, other than the Administrator, may approve an aircraft, airframe, aircraft engine, propeller, appliance, or component part for return to service after it has undergone maintenance, preventive maintenance, rebuilding, or alteration.
2.1. 2 A new maintenance release is required to be issued by a person who is authorised by CASA for the purpose of sub regulation 43 (1) of CAR, using the CASA Form 918 or an approved alternative, at the completion of the required maintenance release inspection.
Certification Maintenance Requirements (CMR) Definition. A CMR is a required scheduled maintenance task established during the design certification of the airplane systems as an operating limitation of the type certificate (TC) or supplemental type certificate (STC).
A Certificate of Release to Service is a statement signed by an Licensed Aircraft Engineer (LAE), with the appropriate certifying approvals, which asserts that the aircraft is airworthy to the degree appropriate for safe flight.
An Approval for Return to Service is a documentation in your aircraft's logbook with the signature and certificate number of the person approving your aircraft for return to service. It is a written certification that tells you whether or not the aircraft is airworthy and ready to fly.