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Appendix B Appendix B. Acronyms 14 CFR Title 14 of the Code of Federal Regulations AC Advisory circular ACO Aircraft certification office ALS Airworthiness limitation section AD Airworthiness directive AMOC Alternative method of compliance CMO Certificate management office DER Designated engineering representative ELOS Equivalent level of safety findings FAA Federal Aviation Administration FSDO Flight standards district office ICA Instructions for continued airworthiness IFO International field office N/A Not applicable ODA Organization designation authorization TCDS Type certificate data sheet UM Unit member B-1