ETSO-C146e A1

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

#### ETSO-C146e A1 *ED Decision 2020/011/R* ##### **Stand-Alone Airborne Navigation Equipment Using the Global Positioning System Augmented by the Satellite-Based Augmentation System** **1 Applicability** This ETSO provides the requirements which stand-alone airborne navigation equipment using the Global Positioning System (GPS) augmented by the Satellite-Based Augmentation System (SBAS) that is designed and manufactured on or after the date of this ETSO must meet in order to be identified with the applicable ETSO marking. Note: Revision A1 provides applicants with an option to use an ETSO-2C205a Class Delta circuit card assembly (CCA) functional sensor as part of their ETSO application. There is no technical MOPS change in comparison with ETSO-C146e. **2 Procedures** 2.1 General The applicable procedures are detailed in CS-ETSO, [Subpart A](#_DxCrossRefBm920220672). 2.2 Specific This section only applies to ETSO articles that use an [ETSO-2C205a](#_DxCrossRefBm920220874) CCA. Applicants that use an ETSO-2C205a CCA will need to coordinate with their CCA supplier for at least the following aspects: 2.2.1 Access to the Information on the Selected ETSO-2C205a CCA The applicant is responsible for establishing the necessary communication channels with the ETSO-2C205a holder company. Applicants who use an ETSO-2C205a SBAS CCA will need to coordinate with their SBAS CCA supplier to obtain the documentation that supports ETSO-2C205a. The applicant’s organisation shall establish a means of communication to obtain timely notifications of design changes, open problem reports (at least the ones that impact the usage of the CCA), occurrence reports and airworthiness directives that affect or relate to the ETSO-2C205a article. 2.2.2 Assessment of Design Changes The applicant shall perform an impact analysis of the design changes to the ETSO 2C205a article, and shall perform the necessary development life-cycle activities that are impacted by the ETSO-2C205a changes. Note: When a major change (as assessed per point 21.A.611) is applied to the ETSO-2C205a article, which is installed into the ETSO-C146e article, it is systematically also considered to be a major change for the ETSO-C146e function. 2.2.3 Assessment and Reporting of Open Problem Reports (OPRs) The applicant shall perform the assessment of the ETSO-2C205a CCA OPRs. The applicant shall report the resulting OPRs that affect the ETSO-C146e article. **3 Technical Conditions** 3.1 Basic 3.1.1 Minimum Performance Standard The applicable standards are those provided for functional equipment Class Gamma or Delta in RTCA document DO-229E, Minimum Operational Performance Standards for Global Positioning System/Satellite-Based Augmentation System Airborne Equipment, dated 15 December 2006, Section 2, as amended by [Appendices 2](#_DxCrossRefBm920220873) and [4](#_DxCrossRefBm920220872) to this ETSO. Classes Gamma and Delta of equipment are defined in DO-229E, Section 1.4. The test procedures are defined in DO-229E, Section 2.5. The standards in this ETSO apply to equipment intended to accept a desired flight path and provide deviation commands keyed to that path. Pilots and autopilots will use these deviations to guide the aircraft. Except for automatic dependent surveillance with Class Gamma, these ETSO standards do not address integration issues with other avionics. Use of an ETSO-2C205a Class Delta CCA functional sensor Applicants for Class Delta-4 ETSO-146e have the option to use an ETSO-2C205a Delta CCA functional sensor. Applicants who choose to use an ETSO-2C205a Delta CCA can take credit for certification compliance by virtue of the ETSO-2C205a ETSOA for: — meeting the Class Delta-4 MPS requirements in Sections 2.1.1, 2.1.5, and 2.3; — the development assurance of the hardware/software; — the classification of failure conditions; — the MPS Section 2.5 performance testing (functional qualification), except that specified in Appendix 1 to this document; and — the partial environmental testing performed on the ETSO-2C205a CCA. After the integration of the ETSO-2C205a CCA into the ETSO-146e article, the applicant shall perform the testing described in Appendix 1. The applicant shall also complete the environmental qualification testing. The testing shall include the detailed functional test procedures delivered by the ETSO-2C205a CCA provider. This testing is required to address the paragraphs of this ETSO that are not covered by the items listed above. Note: An end-use manufacturer that uses an ETSO-2C205a SBAS CCA functional sensor assumes full responsibility for the design and its function under their ETSO-C146e authorisation. 3.1.2 Environmental Standard See CS-ETSO, Subpart A, paragraph 2.1. The required performance under test conditions is defined in RTCA document DO-229E, Minimum Operational Performance Standards for Global Positioning System/Satellite-Based Augmentation System Airborne Equipment, dated 15 December 2016, Section 2.4. 3.1.3 Software See CS-ETSO, Subpart A, paragraph 2.2. Applicants who use an ETSO-2C205a Class Delta CCA functional sensor may use the ETSO-2C205a authorisation as substantiation for compliance with the software development assurance aspects of the CCA. 3.1.4 Electronic Hardware Qualification. See CS-ETSO, Subpart A, paragraph 2.3. Applicants who use an ETSO-2C205a Class Delta CCA functional sensor may use the ETSO 2C205a authorisation as substantiation for compliance with the hardware development assurance aspects of the CCA. 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 is a: — major failure condition for a loss of function or malfunction of en route, terminal, approach lateral navigation (LNAV), and approach LNAV/vertical navigation (VNAV) position data, — major failure condition for a loss of function of approach localiser performance without vertical guidance (LP), and of approach localiser performance with vertical guidance (LPV) position data, and — Hazardous failure condition for the malfunction of approach (LP and LPV) position data that results in misleading information. Note: These failure condition classifications are considered to be the minimum classifications. Guidance for the installation of navigation systems at the aircraft level (e.g. Certification Specifications and Acceptable Means of Compliance for Airborne Communications, Navigation and Surveillance (CS-ACNS)) could require different failure condition classifications. 3.2.2 Additional Specific If the equipment can satisfy the requirements of RTCA/DO-229E only when used with a particular antenna, the use of that antenna (by part number) shall be a requirement on the installation. This requirement shall be included in the installation manual as a limitation. Applicants shall have all the data necessary to evaluate the geo stationary (GEO) satellite bias as defined in RTCA DO-229E, Section 2.1.4.1.5 available for review by EASA. If the equipment uses barometric-aiding to enhance the availability of the FDE, then the equipment shall meet the requirements in RTCA DO-229E, Appendix G. **4 Marking** 4.1 General See CS-ETSO, Subpart A, paragraph 1.2. 4.2 Specific At least one major component shall be permanently and legibly marked with the operational equipment class as defined in Section 1.4.2 of RTCA document DO-229E (e.g. Class 2). A marking of Class 4 indicates compliance with the Delta-4 requirements. The functional equipment class defined in Section 1.4.1 of RTCA document DO-229E (e.g. Gamma, Delta) is not required to be marked. It is sufficient to declare the proper functional equipment class in the declaration of design and performance (DDP). **5 Availability of Referenced Documents** See CS-ETSO, Subpart A, paragraph 3. [Amdt ETSO/6] [Amdt ETSO/13] [Amdt ETSO/16]