The FAA late last week issued special airworthiness information bulletins NM-10-12 and NM-10-13 to address a glitch in software for Honeywell NZ-2000 and FMZ-2000/IC-615/IC-800/IC-1080 Primus Epic flight management systems. Affected units are installed on a wide range of business jets manufactured by Cessna, Bombardier, Dassault Falcon, Gulfstream, Hawker Beechcraft and Embraer, as well as several regional jets and airliners. The problem was discovered during an Rnav approach on a Bombardier Challenger programmed with NZ-2000 FMS software version 5.2. According to the FAA, the airplane was flying the WAATS Three Arrival STAR into Salt Lake City International Airport. (The FAA incorrectly identifies the arrival as “WATTS” in SAIB NM-10-12.) “A different runway was selected in the FMS during the STAR, and resulted in the FMS navigating the airplane toward the initial STAR waypoint instead of the next sequential STAR waypoint,” the FAA said. As a result of this incident, Honeywell issued a service information letter on October 15, to provide operators with guidelines for flight plan modifications made on the “arrival” page on the FMS, including a destination runway change. The FAA said this airworthiness concern is not an unsafe condition that would warrant issuance of an Airworthiness Directive.