Airworthiness Directives; Gulfstream Model G-IV, GIV-X, GV, and GV-SP Series Airplanes

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The FAA is adopting a new airworthiness directive (AD) for all Gulfstream Model G-IV and GV series airplanes, and certain GIV-X and GV-SP series airplanes. This AD requires a one-time inspection to determine if a certain floor heater pad system is installed, and deactivation of the subject floor heater pad system if it is installed. This AD results from an incident of short-circuiting of the floor heater pads, in which no circuit breakers tripped in response to the short-circuiting. We are issuing this AD to prevent short-circuiting of the floor heater pad system, which could result in a fire in the airplane cabin.