English Translation Version for Reference Only Number:CTSO-C139a Date of approval:Mar 13 2017 CAAC Approved by:Yang Zhenmei China Civil Aviation Technical Standard Order This China Civil Aviation Technical Standard Order (CTSO)is issued according to Part 37 of the China Civil Aviation Regulations (CCAR-37).Each CTSO is a criterion which the concerned aeronautical materials parts or appliances used on civil aircraft must ply with when it is presented for airworthiness certification. Aircraft Audio System and Equipment 1.Purpose. This China Civil Aviation Technical Standard Order (CTSO)is for manufacturers applying for aircraft audio system and equipment CTSO authorization (CTSOA).This CBO prescribes the minimum performance standards(MPS)that aircaft audio system and equipment must first meet for approval and ideification with the applicable CTSO marking. 2.Applicability. This CTSO is applicable for new applications after the effective date of this CTSO. a.The applicant must submit an application according to this CTSO after its effective date.However up to six months after this CTSO's effective date if the applicant could show working against the prior MPS -1- English Translation Version for Reference Only CAAC CTSO-C139a before the new change became effective the application for previous revision could be accepted. b.The CTSOA article approved under a previous CTSO may still be manufactured under the provisions of original approval after the effective date of this CTSO. c....
CTSO-C139a Aircraft Audio System and Equipment.pdf
