FAA Approved Installation Manual for the Report No 908
EDM-900 and EDM-930 Page 31 of 56 Rev I
Primary Engine Data Management System Date 1-18-2013
30. EMI Radio Test and functional check:
Even through the EDM-900/930 has been tested to DO-160E Section 20 (EMI) the installation itself could creates radio
interference on specific frequencies. The following test is to insure 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-900/930 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-900/930 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-900/930 system
to check if it is the source of this noise. If the EDM-900/930 system is not the source of ‘unusual noise’ then mark the
table with a ‘PASS’.
Frequency NAV/COM 1
(PASS/FAIL)
NAV/COM 2
(PASS/FAIL)
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