The answer to this question is unique to every operator. Especially in the Northern and Southern Latitudes.Įventually, parts obsolescence, repair costs, and operational limitations will force every legacy FMS operator to replace his FMS. The older FMS cannot apply forecast changes in magnetic variation, and as the years progress this will add more and more error into the FMS computed aircraft position. The world’s magnetic variation model is changing. Sometimes this forces the aircrew to land the aircraft enroute to load a new section of the Nav database. Many legacy FMSes don’t have the storage capacity to hold the entire world navigation database. The legacy FMS memory capacity and older Data Transfer Units are placing restrictions on operators. The constraints the legacy FMS puts on your operations in today’s airspace is also an issue to consider. Universal Avionics will do everything they can to keep your FMS in service, but the situation is only going to get worse over time. Parts obsolescence for LCDs, CPU boards, GPS boards, and GPS sensors limits their repair capabilities. Universal Avionics has supported these products for well over 20 years, but the availability of repair parts is becoming a huge problem. Legacy FMSes face several issues as they age.
If you operate one of the following FMSes then your FMS is considered to be a Legacy FMS: There are vast numbers of UNS-1 equipped aircraft operating, of which many are now dealing with obsolescence and increased operating costs.
Universal Avionics has fielded over 30,000 FMS systems in over 50 different types of aircraft since 1983. Understanding The Impact Of Universal Avionics Legacy UNS-1 FMS Systems May 2021
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