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Test Procedure
1) Place the ELT in a secure screen room to prevent radiation of signals on
emergency frequencies.
2) Apply 12 volts DC (from a power supply or external battery) to the test
terminals at the bottom of the unit. See figure 6 for polarity.
CAUTION: Do not attempt to test the ELT by immersing it in water.
Once activated, the internal battery will discharge and cannot be reused.
3) Check to see that red indicator is flashing approximately once per second.
4) The ELT is functional only if the red indicator light flashes without
interruption.
5) If the conditions specified in step 4) are not met, return the unit to ACR
5.3
Operational Test - Shop
Test Equipment Required:
1) Spectrum Analyzer, IFR A-7550 or equivalent.
2) Monopole antenna with BNC connector. Total length of 7.00 inches including
connector circular by 11/16 inch in diameter.
3) Aluminum Ground Plane 12 inches in diameter by 1/16 inch thick.
4) BNC female to BNC female UG-492 B/U feed through adapter to elevate top
of monopole antenna to 7 3/16 inches above ground plane.
5) 13 foot long 50-Ohm RG 58 A/U coaxial cable (0.9 dB loss at 121.5 MHz and
1.3 dB loss at 243 MHz) with BNC male connectors.
6) Test Fixture ACR #T2-01-0016 shown in Figure 3.
7) 12 volt power supply. Connect 12-volt power supply to the fixture banana
jacks.
8) RF screen room.
9) Spectrum Analyzer settings:
Horizontal Sensitivity
Center Frequency
Vertical Sensitivity
Resolution Bandwidth
Reference Level
20 MHz / Div
180 MHz
10 dB / Div
3 MHz
0 dBm
7
Y1-03-0090-2 Rev. D
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