When the main issue is to find a new MRO to perform the maintenance of your aircraft, engines or components, select the best choice from different options or verify that your chosen MRO operates within the desired performance, an on site audit is always necessary to evaluate the actual compliance of its FAR/EASA 121 & 145 certification.
It must include an audit of the Quality Manual & Procedures Manual, the existence of appropriate technical documentation properly updated and an on site inspection that verifies the condition of the facilities to house the type of check and aircraft to be inspected, confirm that the required staff is properly qualified and available during the check slot, controls the existence in quantity, type and condition of special tools & test equipment and the actual compliance "on the floor" of the existing procedures