ETSO-C145e A1

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.

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 ETSO2C204a 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 ETSO2C204a 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 ETSOC145e 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 and 4 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