ETSO-2C177a

• ED Decision 2020/011/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-2C177a *ED Decision 2020/011/R* ##### Data Link Recorder Equipment **1 Applicability** This ETSO provides the requirements that new models of data link recorder systems that are designed and 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 The applicable procedures are detailed in CS-ETSO, [Subpart A](#_DxCrossRefBm920220672). 2.2 Specific All the information specified in EUROCAE ED-112A, Section 2-1, 2-1.3.4, excluding item 6, shall be documented in a manual and be made available to the accident investigation authorities on request. In addition, if special tools or recovery techniques are used to retrieve recorded information from any memory device used within the crash-protected memory module removed from a crash-damaged recorder, these tools/recovery techniques shall be also made available to the accident investigation authorities on request. Note: Requests from accident investigation authorities can be independent of any ongoing investigation. **3 Technical Conditions** 3.1 Basic 3.1.1 Minimum Performance Standard The applicable standards are those provided in the applicable sections of EUROCAE document ED-112A ‘Minimum Operational Performance Specification for Crash Protected Airborne Recorder Systems’ dated September 2013 that pertain to the types of data link recorder as defined in Table 1 below, except for the following exclusions: Chapters IV-1 and IV-6, and Sections 2-1.1, 2-1.5, 2-1.6, 2-1.11, 2-1.12, 2-3.1, 2-5, 3 and Annex IV-B and other ED-112A requirements related to aircraft-level equipment installation, flight testing and aircraft maintenance and as amended by Appendix 1 to this ETSO. <table bgcolor="#d9d9d9" cellpadding="7" cellspacing="0"> <col/> <col/> <tr valign="top"> <td bgcolor="#808080"><p align="left"> <b>Recorder Type </b> </p> </td> <td bgcolor="#808080"><p align="left"> <b>ED-112A Reference </b> </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> Single DLR in a non-deployable recorder</p> </td> <td bgcolor="#d9d9d9"><p align="left"> Section 2 and Part IV. </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> DLR function in a deployable recorder </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Section 2 (except for the tests covered by ETSO-2C517) and Part IV.</p> <p align="left">The recorder shall also comply with ETSO‑2C517. </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> DLR function in a combined non-deployable recorder </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Section 2, Section 4 and Part IV. </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> CVR function in a combined deployable recorder</p> </td> <td bgcolor="#d9d9d9"><p align="left"> Section 2 (except for the tests covered by ETSO-2C517), Section 4 and Part I.</p> <p align="left">The recorder shall also comply with ETSO‑2C517.</p> </td> </tr> </table> ***Table 1 — MPS Requirements per recorder type*** 3.1.2 Environmental Standard See CS-ETSO, [Subpart A](#_DxCrossRefBm920220672), paragraph 2.1 3.1.3 Software See CS-ETSO, [Subpart A](#_DxCrossRefBm920220672), paragraph 2.2 3.1.4 Airborne Electronic Hardware See CS-ETSO, [Subpart A](#_DxCrossRefBm920220672), paragraph 2.3 3.2 Specific 3.2.1 Failure Condition Classification See CS-ETSO, [Subpart A](#_DxCrossRefBm920220672), paragraph 2.4. A loss or erroneous behaviour of the function defined in paragraph 3.1.1 of this ETSO has been determined to be a minor failure condition. Note: The failure classification is driven by the use of recorders in accident investigations. **4 Marking** 4.1 General See CS-ETSO, [Subpart A](#_DxCrossRefBm920220672), paragraph 1.2 4.2 Specific The equipment shall comply with the identification requirement in EUROCAE ED-112A Section 2-1, paragraph 2-1.16.3, if it is fixed, and those of ETSO-2C517, if it is deployable. **5 Availability of Referenced Documents** See CS-ETSO, [Subpart A](#_DxCrossRefBm920220672), paragraph 3 [Amdt ETSO/6] [Amdt ETSO/12] [Amdt ETSO/16]