ETSO-C201

• ED Decision 2016/013/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-C201 *ED Decision 2016/013/R* ##### Attitude and Heading Reference Systems (AHRS) **1 Applicability** This ETSO provides the requirements which Attitude and Heading Reference Systems (AHRSs) 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 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 RTCA Document No RTCA/DO-334 ‘Minimum Operational Performance Standards (MOPS) for Solid-State Strap-Down Attitude and Heading Reference Systems (AHRS)’, dated 21.3.2012. This ETSO applies to solid state strap-down AHRS intended to output pitch and roll attitude that does not use gimbaled sensors. It also addresses the optional functions of heading, turn, slip and the display of information provided by an AHRS. When the article provides heading, turn and slip, degraded mode, uses aiding, includes a display, or provides information generated by the AHRS to a stand-alone display, it must, in particular, meet the requirements as listed in the table below. <table bgcolor="#d9d9d9" cellpadding="7" cellspacing="0"> <col/> <col/> <tr valign="top"> <td bgcolor="#808080"><p align="center"> <b>Optional Functions/Mode/Source</b></p> </td> <td bgcolor="#808080"><p align="center"> <b>Requirement</b></p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="center"> Heading</p> </td> <td bgcolor="#d9d9d9"><p align="center"> 2.2.3</p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="center"> Turn and Slip</p> </td> <td bgcolor="#d9d9d9"><p align="center"> 2.2.5</p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="center"> Degraded Mode</p> </td> <td bgcolor="#d9d9d9"><p align="center"> 2.2.4</p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="center"> Aiding</p> </td> <td bgcolor="#d9d9d9"><p align="center"> 2.2.6</p> </td> </tr> <tr valign="top"> <td bgcolor="#d9d9d9"><p align="center"> Display</p> </td> <td bgcolor="#d9d9d9"><p align="center"> 2.5</p> </td> </tr> </table> 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 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. **4 Marking** 4.1 General Marking as 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/11]