ETSO-2C123c

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

#### ETSO-2C123c *ED Decision 2020/011/R* ##### Cockpit Voice Recorder Systems **1 Applicability** This ETSO provides the requirements that cockpit voice recorder (CVR) 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 that is 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 EUROCAE ED-112A, MOPS for Crash Protected Airborne Recorder Systems, dated September 2013, that pertain to the CVR type, except Chapters I-1 and I-6, and Sections 2-1.1, 2-1.5, 2-1.6, 2-1.11, 2-1.12, 2-3.1, 2-5, 3, Annex I-A, Annex I-C, and other ED-112A requirements related to installation, flight testing, aircraft maintenance as amended by Appendix 1 to this ETSO*.* Table 1 lists CVR types and the ED-112A Section and Part containing the MPS for each type: ***Table 1 — CVR MPS Requirements*** <table bgcolor="#d9d9d9" cellpadding="7" cellspacing="0"> <col/> <col/> <tr valign="top"> <td bgcolor="#808080"><p align="center"> <b>CVR Type </b> </p> </td> <td bgcolor="#808080"><p align="center"> <b>ED-112A Reference </b> </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> Single-function CVR in a non-deployable recorder</p> </td> <td bgcolor="#d9d9d9"><p align="left"> Section 2 and Part I. </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> CVR function in a <u>deployable</u> recorder </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Section 2 (except for tests covered by ETSO‑2C517) and Part I.</p> <p align="left">The recorder shall also comply with <br/> ETSO-2C517. </p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="left"> CVR function in a <u>combined <br/> </u>non-deployable recorder </p> </td> <td bgcolor="#d9d9d9"><p align="left"> Section 2, Section 4, and Part I. </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 tests covered by ETSO 2C517), Section 4 and Part I.</p> <p align="left">The recorder shall also comply with <br/> ETSO-2C517.</p> </td> </tr> </table> Note: A CVR article may cover multiple types. A CVR may be a combined CVR and may also be deployable, in which case the applicable MOPS are Sections 2, 4, Part I and the MOPS of ETSO 2C517, following the table above. 3.1.2 Environmental Standard See CS-ETSO, Subpart A, paragraph 2.1. 3.1.3 Software See CS-ETSO, Subpart A, paragraph 2.2. 3.1.4 Airborne Electronic Hardware 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. A failure of the function defined in paragraph 3.1.1 of this ETSO is a minor failure condition. A loss of the function defined in paragraph 3.1.1 of this ETSO is a minor failure condition. The applicant must develop the system to be at least the development assurance level that is commensurate with these failure conditions. Note: The failure classification requirement is driven by the use of CVRs in accident investigations. **4 Marking** 4.1 General See CS-ETSO, Subpart A, paragraph 1.2. 4.2 Specific 4.2.1 Lettering Identification 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, paragraph 3. [Amdt ETSO/6] [Amdt ETSO/13] [Amdt ETSO/16]