This document is intended to be a user’s manual to AC 25.954 1 on acceptable means of compliance for applicants with regards to 14 CFR 25.954 at Amendment 25 146 and to encourage a consistent approach to be applied across industry. This document is also intended to be a user’s manual to AMC 25.954 on acceptable means of compliance for applicants with regards to EASA CS 25.954 at Amendment 26.