This SAE Aerospace Recommended Practice (ARP) describes the multi-pass method for evaluating the filtration performance of fine lube filter elements@ commonly utilized in aerospace power and propulsion lubrication systems: gas turbine engines@ auxiliary power units (APUs)@ helicopter transmissions@ constant speed drives (CSDs)@ and integrated drive generators (IDGs). Introduction Variation in filter element testing methods and requirements make comparison of results difficult. In order to minimize these problems@ this document describes standard filtration ratings and test procedures. Both manufacturer and customer will have a common means to specify@ control@ and evaluate filter elements.