Approved Installation Manual for the Experimental Report No 104
EDM-350 Page 28 of 46 Rev A
Engine Data Management System Date 7-10-2021
25. EMI Radio Test and functional check:
Even through the EDM-350 has been tested to DO-160E Section 20 (EMI) the installation itself could create radio
interference on specific frequencies. The following test is to ensure that this does not exist.
EMI/RFI TESTS: perform tests, in accordance to the table below, to insure wire routing and connectivity has not
compromised the signal integrity of the NAV/COM receivers. Power up the aircraft bus (or buses) in accordance with
normal engine prestart procedures (see Aircraft Pilot Operating Handbook). Verify that the EDM-350 is operating
normally and there are no bad probes or alarm messages. Set the frequency and audio panel to listen to that radio.
Loud buzzing/humming is considered ‘unusual noise’ in the context of these tests also the OBS needle should not
move. Should any EMI noise be found that is attributed to the EDM-350 system, it must be corrected by shielding
and/or rerouting wiring to eliminate the noise. If unusual noise is heard, remove power from the EDM-350 system to
check if it is the source of this noise. If the EDM-350 system is not the source of ‘unusual noise’ then mark the table
with a ‘PASS’.
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