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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 § 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. The FAA Advisory Circular (AC) and the EASA Acceptable Means of Compliance (AMC) documents appear to provide equivalent guidance, using identical wording in most sections. Applicants should coordinate with their certifying authority to ensure that their proposed approach is acceptable, and the means of compliance and compliance data planned are sufficient for certification. It is recommended that the applicant verify that use of the guidance in this document is acceptable to their certifying authority.