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
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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
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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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