ETSO-C194

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

#### ETSO-C194 *ED Decision 2012/009/R* ##### Helicopter Terrain Awareness and Warning System (HTAWS) **1 Applicability** This ETSO gives the requirements which Helicopter Terrain Awareness and Warning System (HTAWS) 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-309, Minimum Operational Performance Standards (MOPS) for Helicopter Terrain Awareness and Warning System (HTAWS) Airborne Equipment, dated 13/03/2008. 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 None. **5 Availability of Referenced Document** See CS-ETSO Subpart A paragraph 3. [Amdt ETSO/7]