ETSO-C147a

• ED Decision 2016/029/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-C147a *ED Decision 2016/029/R* ##### **Traffic Advisory System (TAS) Airborne Equipment** **1 Applicability** This ETSO gives the requirements that new models of active traffic advisory system (TAS) airborne equipment that are designed and manufactured on or after the date of this ETSO must meet in order to be identified with applicable ETSO marking. Equipment Classes are: — Class A. Equipment incorporating a horizontal situation display that indicates the presence and relative location of intruder aircraft, and an aural alert informing the crew of a Traffic Advisory (TA). — Class B. Equipment incorporating an aural alert and a visual annunciation informing the crew of a TA. **2 Procedures** 2.1 General Applicable procedures are detailed in CS-ETSO [Subpart A](#_DxCrossRefBm920220672). 2.2 Specific None. **3 Technical Conditions** 3.1 Basic 3.1.1 Minimum Performance Standard Standards set forth in RTCA Document No. RTCA/DO-197A, “Minimum Operational Performance Standards for An Active Traffic Alert and Collision Avoidance System I (ACTIVE TCAS 1),” Section Two (2) September 12, 1994, as amended by [Appendix 1](#_DxCrossRefBm920220880) of this document. 3.1.2 Environmental Standard See CS-ETSO, Subpart A, paragraph 2.1. 3.1.3 Computer Software See CS-ETSO, Subpart A, paragraph 2.2. 3.1.4 Electronic Hardware Qualification See CS-ETSO, Subpart A, paragraph 2.3. 3.2 Specific None 3.2.1 Failure Condition Classification See CS-ETSO, Subpart A, paragraph 2.4. Failure of the function defined in paragraph 3.1.1 of this ETSO has been determined to be a major failure condition for malfunctions causing the display or annunciation of hazardously misleading information in airborne aircraft. Loss of the function defined in paragraph 3.1.1 is a minor failure condition. **4 Marking** 4.1 General Marking is detailed in CS-ETSO Subpart A paragraph 1.2. 4.2 Specific None. **5 Availability of Referenced Document** See CS-ETSO Subpart A paragraph 3. [Amdt ETSO/12]