CTSO-C139 AIRCRAFT AUDIO SYS/TEMS AND EQUIPMENT.pdf

Number:CTSO-C139 Date of approval:Sep 19 2011 CAAC Approved by:Yin Shijun China Civil Aviation Technical Standard Order This technical standard order is issued according to Part 37 of the Chinese 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 SYSTEMS AND EQUIPMENT 1.Applicability (1)Minimum Performance Standard.This CTSO is the minimum performance standard that aircraft audio system and equipment must meet for approval and identification with the applicable CTSO marking.New models of audio equipment identified and manufactured on or after the effective date of this TSO must meet the MPS in Section 2 of RTCA/DO-214 Audio Systems Characteristics and Minimum Performance Standards for Aircraft Audio Systems and Equipment (March 1993).CTSO-C50c Audio Selector Panels and Amplifiers CTSO-C57a Headsets and Speaker and CTSO-68a Aircraft Microphones(Except Carbon)are caeled after publishing this CTSO-C139. (2)Failure Condition Classification.Failure of the intended function is a major failure condition.Develop audio systems and -1- CAAC CTSO-C139 equipment to at least the design assurance level for this failure condition. (3)Environmental Qualification.RTCA/DO-160E Environmental Conditions and Test Procedures for Airborne Equipment dated December 9 2004. (4)Software Qualification.If the article includ...