Business jet operators flying with Honeywell NZ-2000 flight management systems are responding to an FAA airworthiness bulletin describing a software glitch that could send airplanes to the wrong instrument arrival waypoint.

The FAA has issued special airworthiness information bulletins NM-10-12 and NM-10-13 to address an issue with software for 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.

The glitch was discovered during an Rnav approach by a Bombardier Challenger with NZ-2000 software version 5.2. on the WAATS Three Arrival into Salt Lake City International Airport.

“A different runway was selected in the FMS during the Star, and this resulted in the FMS navigating the airplane toward the initial Star waypoint instead of the next sequential Star waypoint,” the FAA said. Honeywell has issued a service information letter to provide operators with guidelines for flight plan modifications made on the “arrival” page on the FMS, including a destination runway change.