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Attachment A -Joint Agreement for 800 MHz CCCS Page 51 of 83 Due to the interference potential from the larger coverage footprint of aircraft operated radios, the FCC rules for operation of these radios limits the output power to help reduce interference, as frequency reuse is applicable in the CCCS and other radio systems. Installation of aircraft mounted radios is governed by the Federal Aviation Administration (FAA) and permanent installations must be performed by FAA certified personnel. Operational Context Subscribers that acquire a large coverage footprint due to high altitude operations need to take into consideration potential interference due to frequency reuse in other systems. This could cause Interference to their users. This interference could appear as an interruption, loss of communications, or as tailgating to other talkgroup transmissions on other sites. Protocol/Standard All permanently installed aircraft radios shall comply with the FCC 90.423 power output limitation of 10 watts, the Effective Radiated Power (ERP) being no more than 5 watts. Only unity gain antennas will be allowed. Permanently mounted aircraft radios should be programmed with the following: • BER threshold of 2.5% For aircrews that are assigned portable radios, these portable radios should be programmed for the following: • 2.5% or 2.9% BER threshold These settings apply for both aircraft installed radios using remote mounted mobile or portable radios and Technisonic-type aircraft control panel mounted avionics packages using intemal portable radios. Procedures for landing zone areas where communications with ground personnel are conducted are recommended on a simplex, non-trunked, channel. In addition to the SOP training requirement, training for users of aircraft radios shall include a description of the issues surrounding airborne operation of System radios including: • Issues of potential interference to other systems due to frequency reuse; • Personnel using portable radios in a limited capacity (observers, guests, etc.) and the potential for FAA and FCC rule violation, and interference, Recommended Procedure Installation and programming should be performed as outlined in this section. Operation of Aircraft landing zone coordination should be performed as outlined in this section. In-flight transmissions should be as brief as possible due to the potential interference. Management