Iv the manufacturer shall determine the effects if

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(iv) The manufacturer shall determine the effects, if any, of ice accumulation on the antenna (including performance) and include this information in the installation instructions. (11) Environmental Standard. RTCA DO-208 incorporates as a reference RTCA Document DO-160C, "Environmental Conditions and Test Procedures for Airborne Equipment," dated December 1989. (12) Software Standard . If the equipment design includes a digital computer, the software must be developed in accordance with RTCA Document No. DO-178B, “Software Considerations in Airborne Systems and Equipment Certification,” dated December 1, 1992. The applicant must develop all software that affects navigation and integrity functions to at least the 1Page 41
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TSO-C129a Level C criteria. For software which was developed to a different software standard, Section 12.1.4 provides a method for upgrading a baseline for software development so that changes can be made in accordance with the criteria contained in RTCA/DO-178B. NOTE: If the equipment incorporates more than one software level, appropriate partitioning of different software levels is required. If the applicant elects to use the criteria of Level D or Level E when developing software which does not affect navigation or integrity functions, the applicant must substantiate the use of these levels through a safety assessment process as outlined in RTCA/DO-178B. (b) Marking . In addition to the marking specified in 14 CFR Part 21.607(d), the following information shall be legibly and permanently marked on the major equipment components: (1) Each separate component of equipment that is manufactured under this TSO must be permanently and legibly marked with at least the name of the manufacturer and the TSO number. (2) With regard to 14 CFR Part 21.607(d)(2), the part number is to include hardware and software identification, or a separate part number may be utilized for hardware and software. Either approach must include a means for showing the modification status. (3) The software level or levels in accordance with RTCA/DO-178B. NOTE: If multiple software levels are marked, then the installation instructions must clearly identify the software level for each function. (4) The equipment class. (c) Data Requirements . (1) In addition to meeting the requirements of 14 CFR Part 21.605, the manufacturer must furnish the Manager, Aircraft Certification Office (ACO), Federal Aviation Administration, having purview of the manufacturer's facilities, one copy each of the following technical data: (i) Operating instruction. (ii) Equipment limitations. (iii) Installation procedures and limitations (including any necessary sensor interface restrictions for Class B( ) and Class C( ) equipment). (iv) Schematic drawings as applicable to the installation procedures. Page 42    (a)(3)(vii)  
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TSO-C129a (v) Wiring diagrams as applicable to the installation procedures.
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