DVI-300 Installation Manual
Document Rev. 01.004 DOC0456 Page 26 of 31
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Operate the DVI-300 unit for at least 10 minutes. During this time use the keypad on the DVI-300 to send
several text messages. These operations will exercise the ISAT-200 to DVI-300 communications link.
Because the DVI-300 only instructs the ISAT to place a phone call, it is not necessary to place test phone
calls when testing the DVI-300. The DVI-300 does not perform any satellite communication and therefore
testing the satellite communication for EMI is out of the scope of this test.
The EMI test for the ISAT (See ISAT-200 Installation Manual DOC0334) exercises the ISAT functionality
(including satellite communication) and should be completed separately for new ISAT installations.
Observe the GPS for any degradation in satellite status, availability or flags. Listen for any noise or
detected audio signals on the VHF Communication. Listen for any noise or detected audio signals on the
VOR/LOC receiver audio; look for any movement of flags or needles on the VOR/LOC/GS navigation
display(s). Observe the transponder for any loss of reply or spurious reply.
List the power plant, fuel and other electric instruments on the EMI/RFI Test Report and note any
anomalies that occur while transmitting. Assess the results.
If the aircraft is equipped with an autopilot or stability augmentation system, then test fly the aircraft and
verify that operation of the DVI-300 unit does not have adverse effects on these systems. After checking
for gross effects at a safe altitude, fly an approach with each of the different navigation systems coupled
to the autopilot (ILS, GPS ETC.) and look for any anomalies.
If the installed system passes all of the applicable EMI tests, then no further action is required. If
interference is observed then the interference must be assessed against the appropriate standards of
airworthiness for the system in question. For example it is permissible for a VFR certified GPS to lose
navigation capability under certain conditions, providing that it recovers properly and promptly, but it is not
permissible for an IFR Approach certified GPS to be affected in the same way. A complete discussion of
all the standards of airworthiness to be applied in assessing EMI effects is beyond the scope of this
document.
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