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English Translation Version for Reference Only Number:CTSO-C139a Date of approval:Mar 13,2017 Approved by:Yang Zhenmei China Civil Aviation Technical Standard Order - 1 - 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 comply 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 CTSO prescribes the minimum performance standards(MPS) that aircraft audio system and equipment must first meet for approval and identification 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 English Translation Version for Reference Only CAAC CTSO-C139a - 2 - 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. Major design changes to article approved under this CTSO will require a new authorization in accordance with section 21.310 of CCAR-21R3. 3. Requirements. New models of aircraft audio systems and equipment identified and manufactured on or after the effective date of this CTSO must meet the MPS qualification and documentation requirements in Section 2 of RTCA, Inc., document RTCA/DO-214A, Audio Systems Characteristics and Minimum Performance Standards for Aircraft Audio Systems and Equipment, dated December, 18, 2013. a. Functionality. This CTSO’s standards apply to equipment intended to support aircraft audio systems’ response characteristics. In this document, it is recommended how users and designers can improve communications equipment. It is also recommended minimum standards and test procedures for aircraft microphones (except carbon), headsets, handsets and loudspeakers, audio systems and equipment.
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