Appendix 1 to ETSO-C146e A1- End-Use Equipment Manufacturer Tests after Integration of Delta CCA Functional Sensors Used for Navigation ApplicationsED

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

###### Appendix 1 to ETSO-C146e A1– End-Use Equipment Manufacturer Tests after Integration of Delta CCA Functional Sensors Used for Navigation ApplicationsED *ED Decision 2020/011/R* 1. SCOPE This Appendix describes the required supplementary equipment level testing, in addition to the environmental testing of RTCA document DO-229E, Section 2.4, that the manufacturer of end-use equipment is required to conduct to receive an ETSO-C146e Class Delta-4 authorisation when using an ETSO-2C205a Delta CCA functional sensor. To perform functional tests and to measure the performance in the environment, the applicant will use the detailed functional test procedures delivered with the ETSO-2C205a CCA. These test procedures are intended to streamline and simplify the ETSO-C146e authorisation process for the manufacturer of the end-use equipment by allowing credit for the design and for selected testing performed at the Delta CCA functional sensor level. However, the manufacturer of the end-use equipment remains fully responsible for the design and control of the article per their ETSO-C146e ETSOA. 2. GENERAL PRINCIPLES (a) Testing methods for GPS/SBAS equipment have been standardised by RTCA document DO-229E, and serve as the basis for ETSO-C146e. RTCA document DO-229E was written to cover equipment that can be installed on aircraft. Section 2.4 specifically addresses the issues of the environment in which the equipment operates, and provides the approved test methods to validate its performance in this environment. Section 2.4 represents the RTCA consensus in identifying which RTCA document DO-229E requirements are sensitive to environmental effects. These requirements are listed in the environmental tables referenced in Section 2.4.1. (b) The determination that a MOPS requirement is susceptible to the environment does not depend on whether or not the implementation is a CCA installed within ETSO-C146 article. This is the same concept as an equipment enclosure that is designed to protect against a benign environment compared with one designed for a severe environment; the identification of the susceptible requirements is the same. (c) Therefore, this Appendix uses the tables of RTCA document DO-229E, Section 2.4.1, to identify the MOPS requirements that are susceptible to environmental conditions for a Delta CCA functional sensor in the end-use equipment. The focus is on the change in environment seen by the Delta CCA functional sensor as a result of its installation in the end-use equipment. For example, other components inside the end-use equipment may radiate RF energy that could interfere with the GPS functions; therefore, the ambient testing performed at the CCA level is not equivalent to tests performed in the end-use equipment. This is the basis for defining the RTCA document DO-229E Section 2.5 performance tests that need to be repeated by the manufacturer of the end-use equipment. (d) The Class Delta-4 environmental table referenced in RTCA document DO-229E, Section 2.4.1, is the prime source to determine the MOPS performance requirements that are susceptible to environmental conditions. Based on that table, Class Delta-4 has the same susceptible requirements as Class Beta, but adds two additional requirements for navigation displays and databases that are optional capabilities for Class Delta-4. Those Delta-4 requirements that are similar to those for Class Beta can be grouped in two categories: those that are susceptible to most types of environmental conditions (described in Section 3) and those that are susceptible to only a few (described in Section 4). (e) The options for databases and navigation displays in Delta-4 equipment do not present any repeat MOPS testing requirements for a manufacturer who incorporates an ETSO-2C205a Delta CCA functional sensor in its ETSO-C146e article. The environmental qualification performed by the end‑use equipment manufacturer according to ETSO-C146e is sufficient. The rationale is stated below. (1) The database requirement testing in the environment is meant to ensure that the database storage hardware, which may be separate, is fully functional during the environmental testing. As the pass criterion for such testing is that the retrieved data is correct, the test procedures in the environment are as sensitive to hardware issues as any ambient environment test. Therefore, nothing justifies repeating the tests under ambient conditions in the end-use equipment. (2) Manufacturers of end-use equipment that includes a database must perform the environmental qualification specified by ETSO-C146e and MOPS Section 2.4 irrespective of whether the database is hosted in the Delta CCA functional sensor or elsewhere in the equipment. (3) It is impossible for the Delta CCA functional sensor to incorporate a display or to be a display. 3. PERFORMANCE REQUIREMENTS THAT ARE SUSCEPTIBLE TO MOST ENVIRONMENTAL CONDITIONS The RTCA document DO-229E requirements for accuracy (Section 2.1.5.1), and sensitivity and dynamic range (Section 2.1.1.10) are sensitive to most environmental conditions. However, these requirements are linked to the message loss rate requirement in Section 2.1.1.3.2. Sections 3.1 and 3.2 below identify the testing that manufacturers of end-use equipment are required to repeat to demonstrate that the Delta CCA functional sensor continues to meet the accuracy, dynamic range and message loss rate performance requirements after installation in the end-use equipment. All the tests shall be run under conditions in which the functions of the end-use equipment are fully enabled to create the worst‑case environment. 3.1. RTCA document DO-229E — 2.5.8 Accuracy Test (a) The accuracy test described in Section 2.5.8 is actually a joint test that covers accuracy, sensitivity and dynamic range. This joint testing also applies in the environment as stated in Section 2.4.1.1.5, with the environmental adaptations as described in Section 2.4.1.1.1. (b) The demonstration of accuracy is performed in accordance with Section 2.5.8.1 only for the test case with broadband external interference noise. This test must be repeated when the CCA is installed in the end-use equipment, and it is sufficient to perform it using broadband interference. (1) The environmental testing is limited to broadband interference, as it represents the worst‑case signal-to-noise condition, which is the most sensitive to environmental effects. This applies equally to the environment for the CCA that is created by the end-use equipment. (2) Section 2.5.8 contains a measurement accuracy test in Section 2.5.8.1, with the detailed test procedure in Section 2.5.8.2. The Section 2.5.8.1 test must be run under the worst-case environment identified in the section on ‘Additional considerations for internal interference sources’ below. The measurement accuracy testing can be combined with the message loss rate testing in Section 2.5.2.1. (3) Section 2.5.8.3 is a 24-hour actual satellite accuracy test. The Section 2.5.8.3 test exposes the equipment to a variety of signal conditions and data-processing conditions over varying satellite geometries that will increase the confidence that no unforeseen interactions between the components within the end-use equipment and the Delta CCA functional sensor will go undetected. The 24-hour testing in Section 2.5.8.3 can be combined with the 24-hour message loss rate testing in Section 2.5.2.4 (see the section on ‘Additional considerations for internal interference sources’). (4) Section 2.5.8.4 (SBAS Tracking Bias) is an analysis of the GPS hardware, and it is therefore not necessary to repeat it at the end-use equipment level provided that no extra RF components that affect the RF filtering response are inserted into the RF path. Otherwise, the manufacturer of the end-use equipment must also repeat the SBAS Tracking Bias test. (c) The test threshold is relaxed from 110 % to 125 % as specified in Table 2-25 of the Section 2.5.8.2.1 test procedure to shorten the duration of the test. However, the Section 2.5.8 testing (excluding the SBAS Tracking Bias test in 2.5.8.4) for the CCA in the end-use equipment shall be under ambient conditions per Section 2.5, with the 110-% test pass threshold for maximum test sensitivity. (d) The Section 2.5.8 testing (excluding the SBAS Tracking Bias test in Section 2.5.8.4) should be repeated against the accuracy requirement in Section 2.1.5.1. (e) Only the test case for broadband external interference noise using minimum satellite power will be executed in most cases to shorten the duration of the test. The Section 2.5.8.1 testing will be repeated for both the minimum and the maximum satellite power only for the worst-case environment. 3.2. RTCA document DO-229E — 2.5.2 Message Loss Rate Test (a) Section 2.5.2 specifies the message loss rate test for the 2.1.1.3.2 message loss rate requirement. This test is conducted in conjunction with the Section 2.5.8 accuracy testing. Section 2.5.2.2 defines the test procedure to collect data that verifies the SBAS message loss rate in the presence of interference using the test cases in which the SBAS satellite is at minimum power. Section 2.5.2.3 defines the pass-fail criteria. (b) The test in Section 2.5.2.2 will be performed during the measurement accuracy broadband interference test case described in paragraph 3.1. (c) The test procedure in Section 2.5.2.4.1 is run in conjunction with the 2.5.8.3 24-hour accuracy test. Section 2.5.2.4.2 defines the pass-fail criteria for the test case described in paragraph 3.1(b)(3). 4. PERFORMANCE REQUIREMENTS PARTIALLY SUSCEPTIBLE TO ENVIRONMENTAL CONDITIONS (a) The Class Delta-4 Table 2-20 in Section 2.4.1 of RTCA document DO-229E indicates that the requirements for initial acquisition time (2.1.1.7) and satellite reacquisition time (2.1.1.9) are sensitive to four environmental conditions: icing, lightning-induced transient susceptibility, lightning direct effects, and normal/abnormal operating conditions. The requirements for loss of navigation (Sections 2.1.1.13.2, 2.1.5.12.2, and 2.3.6.2) are sensitive to low and high operating temperatures. Note: Class Delta-4 provides deviation guidance only during the final approach segment of an LP/LPV approach, in which a loss of integrity is treated as a loss of navigation capability. (b) The lightning-induced transient susceptibility, lightning direct effects or icing environmental conditions are not pertinent to the environment created by the end-use equipment relative to the Delta CCA functional sensor. However, the manufacturer of the end-use equipment remains responsible for meeting the overall environmental qualification at the end-use equipment level. (c) Loss of navigation indications are limited to temperature testing, and the information in RTCA DO‑229E, Sections 2.4.1.1.2 and 2.4.1.1.3, is appropriate. The purpose is to ensure that the interface that is used to indicate the loss of navigation is functional under the environmental conditions that are present after the Delta CCA functional sensor is installed in the end-use equipment. Sections 2.4.1.1.2 and 2.4.1.1.3 indicate that any source that generates the indication can be used, since it is the interface, and not the detection mechanism, that is verified. The temperature testing performed at the end-use equipment level is the worst-case scenario. It is not necessary to repeat the CCA level test at room temperature in the end-use equipment since the environmental qualification adequately addresses testing for these requirements. Note: The Class Delta table requires more than just temperature testing under environment to support the optional display component of Class Delta. Since a CCA cannot be a display or incorporate a display, the additional testing in the environment does not apply. (d) EUROCAE ED-14 Section 16 relates to aircraft power supplies (refer to ETSO paragraph 3.1.2 for the environmental qualification requirements). Sections 16.5.1.2 and 16.6.1.2 are for supply voltage modulation (AC)/ripple (DC). Given the potential susceptibility of the Delta CCA functional sensor to power supply noise, it is prudent to repeat the tests at the end-use equipment level on this basis. (e) Sections 4.1 and 4.2 identify the testing that manufacturers of end-use equipment are required to repeat to demonstrate that the Delta CCA functional sensor continues to meet the acquisition time and reacquisition time performance requirements relative to the normal/abnormal operating conditions after installation in the end-use equipment. All tests shall be run under conditions where the functions of the end‑use equipment are fully enabled to create the worst-case environment. 4.1. RTCA DO-22 z9E — 2.5.4 Initial acquisition test procedures The information in RTCA document DO-229E, Section 2.4.1.1.4, on the initial acquisition test in Section 2.5.4 applies. The manufacturer of the end-use equipment shall repeat the initial acquisition testing described in RTCA document DO-229E, Section 2.5.4. 4.2 RTCA DO-229E — 2.5.6 Satellite reacquisition time test The manufacturer of the end-use equipment is required to repeat the satellite reacquisition time testing in RTCA document DO-229E, Section 2.5.6. 5. ADDITIONAL CONSIDERATIONS FOR INTERNAL INTERFERENCE SOURCES (a) Installing a Delta CCA functional sensor into end-use equipment that also includes other functions requires a careful evaluation of the potential internally radiated and conducted interference. The manufacturer of the end-use equipment must evaluate each operating mode to determine whether the mode changes the environment for the installed Delta CCA functional sensor. If there is only one environment or there is clearly one worst-case environment, then the accuracy and message loss rate testing in Section 3 can be run in that operating mode only. For example, if the end-use equipment includes an RF transmitter that radiates at one frequency, one could reasonably argue that setting the transmitter at full power with maximum data throughput would generate a clear worst-case environment in which to run all the testing. (b) In the case of multiple environments, the accuracy and message loss rate tests can either be run under each environment or the methodology in RTCA document DO-229E, Section 2.4.1.2.3, can be used to run an aggregate test with approximately equal time in each mode. The methodology in Section 2.4.1.2.3 must be used to identify the modes with the greatest susceptibility under which the combined accuracy and message loss rate tests are repeated in addition to the aggregate test. For example, the methodology of Section 2.4.1.2.3 is appropriate for end-use equipment that contains a high-power transmitter that operates on a large number of frequencies such that it is impractical to run a test at each frequency. This is analogous to the large number of frequencies that need to be tested during the EUROCAE ED-14 Section 19 testing on induced signal susceptibility and the Section 20 testing on radio frequency susceptibility, and this is the reason why the methodology of Section 2.4.1.2.3 was developed. (c) It is sufficient to identify one worst-case environment when performing the acquisition and 24-hour accuracy testing. 6. SUMMARY (a) The manufacturer of the end-use equipment that incorporates a Delta CCA functional sensor is required to repeat the following RTCA document DO-229E Section 2.5 testing under ambient conditions (see Section 5) after installing the Delta CCA functional sensor in the end-use equipment: — The Section 2.5.8 Accuracy testing (excluding the SBAS Tracking Bias test in 2.5.8.4) adapted per Section 2.4.1.1.1, except that the 110-% test pass threshold is used. Note: Excluding the SBAS Tracking Bias test is acceptable, provided that the end-use equipment does not insert into the RF signal path any components that affect the filtering response. Otherwise, the manufacturer of the end-use equipment must also repeat the SBAS Tracking Bias test. — The Section 2.5.2 message loss rate test. — The Section 2.5.4 initial acquisition test. — The Section 2.5.6 satellite reacquisition time test. (b) The manufacturer of the end-use equipment remains responsible for completing a full environmental qualification evaluation (see ETSO Section 3.1.2) at the end-use equipment level. The manufacturer of end-use equipment that incorporates a Delta CCA functional sensor is required to repeat the loss of navigation indication and loss of integrity indication testing as part of the environmental qualification according to RTCA document DO-229E, Sections 2.4.1.1.2 and 2.4.1.1.3. [Amdt ETSO/13] [Amdt ETSO/16]