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

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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. Page 10 of 20
RTCA Paper No. 021-13/SC226-010 February 6, 2013 2.5.6 Magnetic Effect Test a. Aircraft Microphones (except Carbon): During the test, the following requirements shall be met: The requirements of the appropriate RTCA/DO-160x category. It is recommended that microphones intended for use in the cockpit, should meet the requirements of categories Z and A. It is strongly recommended that a cautionary note citing possible effects to magnetic compasses, be packed with microphones meeting requirements other than Class Z. b. Aircraft Headsets, Handsets and Loudspeakers: During the test, the following requirements shall be met: The requirements of the appropriate RTCA/DO-160x category. It is recommended that headsets and handsets intended for use in the cockpit, should meet the requirements of categories Z and A. It is strongly recommended that a cautionary note citing possible effects to magnetic compasses, be packed with headsets and handsets meeting requirements other than Class Z. STANDARD NORMAL OPERATING CONDITIONS MINIMUM SUPPLY VOLTAGE EMERGENCY SUPPLY VOLTAGE Rated Power -3 dB REF: 0 dB = Rated Power in Paragraph 2.4.2 -6 dB REF: 0 dB = Rated Power in Paragraph 2.4.2 Distortion 20% 30% No Signal Noise -50 dB Cat. A & B -60 dB Cat. Z -40 dB Cat. A & B -40 dB Cat. Z Listening Test Intelligible Intelligible TABLE 2-1 TABULATION OF REQUIREMENTS FOR POWER INPUT TEST Page 11 of 20
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SC-226 MEETING MINUTES Working Group JANUARY 14 ... - RTCA

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