Installation Planning and Considerations
190-01810-00 GDL 82 TSO Installation Manual
Rev. 5 Page 4-9
4.6 Interference Considerations
THE USE OF GROUND-BASED CELLULAR TELEPHONES, WHILE AIRCRAFT ARE AIRBORNE, IS PROHIBITED
BY FCC RULES. DUE TO THE POTENTIAL INTERFERENCE WITH ON-BOARD SYSTEMS, THE USE OF
GROUND-BASED CELL PHONES, WHILE THE AIRCRAFT IS ON THE GROUND, IS SUBJECT TO FAA
REGULATION 14 CFR §91.21. FCC REGULATION 47 CFR §22.925 PROHIBITS AIRBORNE OPERATION OF
GROUND BASED CELLULAR TELEPHONES. WHEN ANY AIRCRAFT LEAVES THE GROUND, ALL
GROUND-BASED CELLULAR TELEPHONES ON BOARD THAT AIRCRAFT MUST BE TURNED OFF.
GROUND-BASED CELL PHONES THAT ARE ON, EVEN IN A MONITORING STATE, CAN DISRUPT
GPS/SBAS PERFORMANCE.
Certain non-aviation radios, including marine transceivers, can interfere with civil aviation navigation and surveillance
equipment, including the GDL
82. The installer is responsible to ensure any modifications are compatible with all
previous aircraft modifications. If the GDL 82 is installed with non-aviation radios, verify there is no interference.
If interference is found it must be eliminated. Recommended methods of eliminating interference include:
1. Relocating antennas.
2. Rerouting cables.
3. Using filters to attenuate unintentional harmonic frequency transmissions.
4. Removing or replacing the interfering radio with a model that does not interfere.
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