190-01004-02
GTN 625/635/650 TSO Installation Manual
Rev. F
Page 6-67
6.12.11 EMI/RFI Check
After installing the GTN and verifying that all interfaces to external equipment are working correctly, a
brief EMI/RFI check must be conducted. This check will verify that the GTN does not produce
unacceptable interference in other avionics systems, and other avionics systems do not produce
unacceptable interference in the GTN.
1. Start the aircraft engines and switch to aircraft power.
2. Turn on all avionics except the GTN.
3. With the GTN switched off, verify that all existing avionics systems are functioning properly.
4. Turn the GTN on and verify that all existing avionics systems continue to function properly.
5. Keep the GTN switched on and remove power from all other avionics systems.
NOTE
Removing power from systems interfaced to the GTN will cause the associated system
flags on the GTN to be displayed. This is normal behavior and does not constitute a test
failure.
6. Turn the display brightness level up to 100%.
7. Apply power to the other avionics systems one at a time and verify that the system functions
properly without any unacceptable interference caused by the GTN.
8. Wait for the system to begin functioning normally before applying power to the next system.
9. Once all of the systems are powered up, transmit on the COM over several different frequencies.
10. While transmitting, verify that the other aircraft systems function normally.
6.12.12 GDL 88 Interface Check
When testing the GDL 88, the aircraft must be located outside and have an unobstructed view of the sky. If
the GDL 88 is installed and connected to the GTN, check the operation as follows:
1. Start all GTNs in Configuration Mode as described in Section 6.4.
2. Access the GDL 88 page from the External Systems page.
3. Touch the ‘Diagnostics’ key followed by the ‘GPS/SBAS Data’ key.
4. Verify that the GDL 88 is receiving valid position source data.
5. Verify that the status of the External PPS connection(s) is valid.
If a TAWS/HTAWS system is installed in addition to the GDL 88, check the operation as follows:
6. Access the GDL 88 Discrete Input page on the GDL 88 Diagnostics page.
7. Verify the Audio Inhibit #1* discrete input indicates Active when the TAWS/HTAWS system is
playing audio, and Inactive otherwise. See Section 6.9.6.
Summary of Contents for GTN 625
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