SC-226 MEETING MINUTES Working Group JANUARY 14 ... - RTCA

RTCA Paper No. 021-13/SC226-010
February 6, 2013
Due to the reduced strains and weight of the earpiece, Therefore the maximum pulling load of
1.0 kg shall be applicable for the earpiece – cable interface.
EASA deviation ETSO.DevP.56c.pdf Deviation request #56 for an ETSO approval for CS-ETSO applicable
to Aircraft Microphones (ETSO- C58a) Consultation Paper – Christian Kast, Holmco
Added section 2.2.2.3 to address the EASA deviation allowing 3.5dB output increase instead of 5dB
required for all other microphones based on testing done by Holmco and submitted and approved by
EASA.
2.2.2.3 Handset Microphone
When tested in accordance with the test procedure in subparagraph 2.6.2.3, the
total harmonic distortion contributed by the microphone shall not exceed five
percent over the frequency range of 350 to 6000 Hz at a sound pressure input of
114 dB SPL (re: 20 pPa). Increasing the sound pressure input by 6 dB must yield
an output increase of at least 3.5 dB.
DO-160x references issues: Todd Blackstock – AEM
We have previously changed all references to DO-160C to DO-160x. Todd Blackstock has re-reviewed
the edited standard and found additional references to specific subparagraphs within DO-160C that are
still referenced. Specific subparagraph numbers within DO-160C should not be referenced in the
revised standard because DO-160 is revised so often and specific subparagraph numbers could change.
The consensus is that we can use the section title and major section number (e.g. 16.0) from DO-160 as
a more reliable reference since these are less likely to change as new revisions of DO-160 are produced
in the future. Additional references within the standard, to specific categories from DO-160 need to be
reviewed and edited as appropriate as well. Highlighted below.
2.4.11.1 Audio Noise Without Signal
When tested in accordance with the test procedures in subparagraph 2.8.2.11.1,
the level of the noise output of the system shall be at least 50 dB below the
rated output of the system for Category A and B and 60 dB for Category Z
(RTCA/DO-160x Definitions, Subsection 19.2).
2.5.1 Temperature and Altitude Tests
RTCA/DO-160x contains several temperature and altitude test procedures that
are specified according to equipment category. These categories are included
in Subsection 4.3 of RTCA/DO-160x. The following subparagraphs
contain the applicable test conditions specified in Section 4.0 of RTCA/DO-
160x.
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