SW-10-43 – Rotorcraft/ All/ All Models

Various government agencies, emergency medical services (EMS), electronic news gathering (ENG), and other special service operators have a valid need for non-aviation, multi-band mission radios to be installed in rotorcraft. These non-aviation radios may be capable of transmitting directly on radio frequencies reserved for aviation. In all instances, these non-aviation radios are capable of generating harmonics while transmitting that creates interference with and adversely affects the operation of required communication, navigation, and surveillance equipment in the rotorcraft. This interference may cause the loss of a function or introduce misleading information to the flight crew. 14 CFR 29.1431 addresses interference to required radios on all Part 29, as well as Part 27 IFR rotorcraft. 14 CFR 27/29.1309 addresses required systems functioning under any foreseeable operating condition for VFR normal category rotorcraft. Hence the interference caused by non-aviation radios to required systems is a foreseeable operating condition and needs to be addressed in all installations.

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