ETSO-C154c

• ED Decision 2012/009/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-C154c *ED Decision 2012/009/R* ##### Universal Access Transceiver (UAT) Automatic Dependent Surveillance - Broadcast (ADS-B) Equipment Operating on the Frequency of 978 MHz **1 Applicability** This ETSO gives the requirements which Universal Access Transceiver (UAT) Automatic Dependent Surveillance - Broadcast (ADS-B) Equipment Operating on the Frequency of 978 MHz that are manufactured on or after the date of this ETSO must meet in order to be identified with the applicable ETSO marking. **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 the Radio Technical Commission for Aeronautics (RTCA) Document DO-282B, Minimum Operational Performance Standards for Universal Access Transceiver (UAT) Automatic Dependent Surveillance Broadcast (ADS-B), dated 02/12/2009. 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 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. **4 Marking** 4.1 General Marking as detailed in CS-ETSO Subpart A paragraph 1.2. 4.2 Specific Transmitting and receiving components must be permanently and legibly marked. The following table explains how to mark components. Find the equipment class in RTCA/DO-282B, Section 2.1.11. <table bgcolor="#d9d9d9" cellpadding="7" cellspacing="0"> <col/> <col/> <col/> <tr valign="top"> <td bgcolor="#808080"><p align="left"> <b>If component can: </b> </p> </td> <td bgcolor="#808080"><p align="left"> <b>Mark it with: </b> </p> </td> <td bgcolor="#808080"><p align="left"> <b>Sample marking pattern: </b> </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> Transmit and receive </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Equipment class it supports </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Class A1H or Class A3 </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> Transmit, but not receive </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Equipment class it supports </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Class B1 or </p> <p align="left">Class A3 - Transmit Only </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> Receive, but not transmit </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Equipment class it supports </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Class A2 - Receive Only </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> Perform the optional frequency diplexer function developed under this ETSO </p> </td> <td bgcolor="#d9d9d9"><p align="left"> The words “UAT Diplexer,” </p> <p align="left"> Maximum amplitude attenuation between the antenna port (A) and UAT port (U) of the diplexer, and </p> <p align="left"> <br/> </p> <p align="left">Maximum amplitude attenuation between the antenna port (A) and transponder port (T) of the diplexer</p> </td> <td bgcolor="#d9d9d9"><p> UAT Diplexer</p> <p> A/U -0.x dB</p> <p>A/T -0.x dB</p> </td> </tr> </table> **5 Availability of Referenced Document** See CS-ETSO Subpart A paragraph 3. [Amdt ETSO/7]