ETSO-C145e A1

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

#### ETSO-C145e A1 *ED Decision 2020/011/R* ##### Airborne Navigation Sensors Using the Global Positioning System Augmented by the Satellite-Based Augmentation System **1 Applicability** This ETSO provides the requirements which airborne navigation sensors using the Global Positioning System (GPS) augmented by the Satellite Based Augmentation System (SBAS) 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. The standards of this ETSO apply to equipment intended to provide position information to a navigation management unit that outputs deviation commands referenced to a desired flight path, pilots or autopilots will use these deviations to guide the aircraft. Note: Revision A1 provides applicants with an option to use an ETSO-2C204a SBAS circuit card assembly (CCA) functional sensor as part of their ETSO application. There is no change to the technical MOPS in comparison with ETSO-C145e. **2 Procedures** 2.1 General The applicable procedures are detailed in CS-ETSO, [Subpart A](#_DxCrossRefBm920220672). 2.2 Specific This section applies only for ETSO articles that use an ETSO-2C204a Beta CCA. Applicants who use an ETSO-2C204a Beta CCA will need to coordinate with their Beta CCA supplier at least for the following aspects: 2.2.1 Access to the Information of the Selected ETSO-2C204a CCA The applicant is responsible for establishing the necessary communication channels with the ETSO 2C204a holder company. Applicants who use an ETSO-2C204a SBAS CCA will need to coordinate with their SBAS CCA supplier to obtain the documentation that supports ETSO 2C204a. 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 circuit card assembly), occurrence reports and airworthiness directives that affect or are related to the ETSO 2C204a article. 2.2.2 Assessment of Design Changes The applicant shall perform an impact analysis of the design changes to the ETSO-2C204a article, and shall perform the necessary development life-cycle activities that are impacted by the ETSO 2C204a changes. Note: When a major change (as assessed per point 21.A.611) is applied to the ETSO 2C204a article, which is installed in the ETSO-C145e article, it is systematically also considered to be a major change for the ETSO-C145e function. 2.2.3 Assessment and Reporting of Open Problem Reports (OPRs) The applicant shall perform an assessment of the ETSO-2C204a CCA OPRs. The applicant shall report the resulting open problem reports that affect the ETSO-C145e article. **3 Technical Conditions** 3.1 Basic 3.1.1 Minimum Performance Standard The applicable standards are those provided for functional equipment Class Beta in RTCA document DO-229E, Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System Airborne Equipment dated 15 December 2016, Section 2, as amended by [Appendices 2](#_DxCrossRefBm920220866) and [4](#_DxCrossRefBm920220865) to this ETSO. Class Beta equipment is 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 provide position, velocity, and time information for a navigation management unit application that outputs deviation commands keyed to a desired flight path, or a non-navigation application such as an automatic dependent surveillance — broadcast (ADS-B) or terrain awareness and warning system (TAWS). In navigation applications, pilots or autopilots will use the deviations output by the navigation management unit to guide the aircraft. In non-navigation applications, the position, velocity, and time outputs will provide the necessary inputs for the end-use equipment. These ETSO standards do not address integration issues with other avionics. Use of an ETSO-2C204a SBAS CCA functional sensor ETSO-145e applicants have the option to use an ETSO-2C204a SBAS CCA functional sensor. Applicants who choose to use an ETSO-2C204a SBAS CCA functional sensor can take credit for certification compliance by virtue of the ETSO-2C204a ETSOA for: — meeting the MPS Section 2.1 requirements; — the development assurance of the hardware/software; — the classification of the failure conditions; and — the MPS Section 2.5 performance testing (functional qualification) except those tests that are specified in Appendix 1 to this document; — the partial environmental testing performed on the ETSO-2C204a CCA. After the integration of the ETSO-2C204a CCA into the ETSO-145e 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-2C204a CCA provider. This testing is required to address the paragraphs of this ETSO that are not covered by the points listed above. Note: The manufacturer of end-use equipment that uses an ETSO‑2C204a SBAS CCA functional sensor assumes full responsibility for its design and function under their ETSO-C145e 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-2C204a SBAS CCA functional sensor may use the ETSO-2C204a authorisation as substantiation for compliance with the software development assurance aspects of the CCA. 3.1.4 Airborne Electronic Hardware See CS-ETSO, Subpart A, paragraph 2.3. Applicants who use an ETSO-2C204a SBAS CCA functional sensor may use the ETSO-2C204a 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 a for 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 a 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 a different failure condition classification. 3.2.2 Additional Specific If the equipment can satisfy the requirements of RTCA document 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. The applicant shall have all the data necessary to evaluate the geostationary (GEO) satellite bias as defined in RTCA document DO-229E, Section 2.1.4.1.5, available for review by EASA. If the equipment uses barometric-aiding to enhance availability of FDE, then the equipment shall meet the requirements in RTCA document 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 must 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). The functional equipment class defined in Section 1.4.1 of RTCA document DO-229E (e.g. Beta) 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]