Appendix 3 to ETSO-C199 A1 –
Environmental Testing for Class
B Equipment
ED Decision 2020/011/R
A3 Environmental Test Considerations
A3.1 The environmental tests and performance requirements described in this subsection provide a laboratory means of determining the overall performance characteristics of the equipment under conditions that are representative of those that may be encountered in actual aeronautical operations.
A3.2 The following test procedures must be run when performing environmental testing on Class B equipment. Class B equipment only needs to be tested under DO-160D change 3 or later Environmental Test, Section 4 Temperature and Altitude, and Section 5 Temperature Variation Testing.
A3.3 The test procedure provided below is considered satisfactory for use in determining the performance of the equipment under environmental conditions. Although specific test procedures are cited, it is recognised that other methods may be preferred. These alternative procedures may be used if the manufacturer can show that they provide at least equivalent information. In such cases, the procedures cited herein should be used as one criterion in evaluating the acceptability of the alternative procedures.
Note: The intent of this section is to minimise the testing of commercial off-the-shelf (COTS) devices.
A3.4 Class B Equipment System Test
A3.4.1 Equipment Required: A representative antenna of what will be installed in an actual airborne TABS.
A3.4.2 Figure 1 provides a representation of the test setup.
Figure 1 — Test Set-up
A3.4.3 Measurement Procedure:
A3.4.3.1 Set the test equipment to measure the output of the position source.
A3.4.3.1.1 Verify that the position information output by the GPS to the TABS is correct for:
A3.4.3.1.1.1 The latitude and longitude of the surveyed location when connecting the device to a live (e.g. rooftop) antenna, or;
A3.4.3.1.1.2 The output by the GPS simulator for the scenario outlined in Section A2.2.6.3.3
A3.4.3.1.2 Using the test set-up in A3.4.2, monitor the sensor-provided HFOM, or HFOM derived from the sensor-provided HDOP per paragraph A1.2.5.8. This output SHALL be compared against the horizontal position error for each valid position estimate. In order to pass the test, the horizontal position accuracy output must be greater than the actual position error for at least 95 % of the samples. The horizontal position error SHALL not exceed 0.5 NM at any time during the test.
[Amdt ETSO/13]
[Amdt ETSO/16]