A performance test is required for all Canadian installations during the annual checks. A performance test can only be done by a certified avionics shop with the proper equipment. The avionics shop will test per CAR Part V, Standard 571, appendix G for the following:
NOTE: The following annual checks are a requirement of Canada. However, the accumulated time of the tests will add significantly to the battery in use time. This may cause a seven flash error due to exceeding the one hour limit. Testing should minimize the “ON” time required. Replacing the battery is required if the seven flash error occurs.
4.2.2.1 Peak Power Check
Measure the peak power after 3 minutes of operation.
Remove the ELT from the aircraft per paragraphs 4.4.1 and 4.4.2. This test requires an RF screen room or attenuator chamber. Output power may be measured using a suitable Spectrum Analyzer connected to the output BNC connector of the ELT. Use a suitable impedance matching device and/or attenuator in line with the ELT. Refer to Specifications, paragraph 6.0 (page 51) for output power minimum acceptable limits. The output contains two active frequencies. The signal at 121.5 MHz is active except when the 406 MHz signal is active. The two power output levels are different.
4.2.2.2 Frequency Check
Measure the frequency after 3 minutes of operation.
This test is best performed using a tester designed specifically for beacons of this type. A spectrum analyzer can best measure the frequencies of the two active signals. Keep in mind the 406 MHz signal is a 440 millisecond burst approximately every 50 seconds.
4.2.2.3 Audio Modulation Check
The audio modulation shall be recognizable as a typical ELT signal, and shall meet the specifications of the ELT manufacturer.
Refer to paragraph 4.4.9 (page 45) to check the 121.5 MHz audio modulation sweep.
Refer to paragraph 4.4.10 (page 46) to check the 406 MHz coded message.
4.2.2.4 Current Draw Check
Measure the current draw in the “ARM” or “Auto” position, and in the “ON” position as specified by the ELT manufacturer.
Antenna connection must be terminated in 50. for current measurements to be accurate. Tests require an adapter to measure the battery voltage and current. Contact Artex technical support to order adapter P/N 500-0057.
Battery current in the “ARM” mode must be ≤ 2uA. When the ELT is “ON” and between 406 MHz bursts, the current will stabilize to approximately 78mA to 88mA (121.5 MHz only). The 406 MHz burst will draw approximately 3 to 4A. Burst current should not exceed 5 Amps.
4.2.2.5 Automatic Activation System Check
Paragraph 4.4.6, “G-Switch Check” provides a simple method of checking the automatic activation system.
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