sule 66The objective of Part 66 is to set standards, specifications, restrictions, and requirements for the issue of aircraft maintenance personnel licences and ratings under the Civil Act 2025,19024 M I N E R A L S P I R I T S 663 Revision 10 2025 Mineral Spirits 663 is a medium-boiling aliphatic solvent consisting primarily of C9-C12 saturated hydrocarbons with