J.P. Instruments EDM 960 Twin Primary Installation Manual - Manual (Page 29)

FAA Approved Installation Manual for the EDM-960 system Report No 909
Primary Engine Data Management System Page 29 of 46 Rev D
Date 2-6-2014
34. EMI Radio Test:
Even through the EDM-960 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-960 is operating
normally. 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-960 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-960 system to check if it is the source of this noise. If the EDM-
960 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) Comments
108.00
112.00
115.00
117.00
120.00
121.00
122.00
123.00
124.00
125.00
126.00
127.00
128.00
129.00
130.00
132.00