Do Not Delay. The Universal Avionics FMS GPS Rollover Software Update Is Only Months Away

November 2024

May 31, 2025. That is the deadline for the Universal Avionics FMS (FC06) GPS week number rollover software update. If you wait until 2025 to perform this update, this is what you can expect.

1. Longer turnaround time. As the deadline for this update approaches, the demand for it will only get higher, and you may have to wait longer to get your unit back.
2. Price increase. It is expected that Universal will increase the price of this update in January 2025.
3. Service interruptions. If your unit is not upgraded by the deadline, you may experience service interruptions.

FMS (FC06) GPS Software Update

Duncan Aviation Component Repair Services are now authorized to perform the FC06 FMS GPS week number rollover software update on the following Universal Avionics LRUs and applicable Service Bulletins (SBs):

These SBs Mods apply to UNS-1Espw, UNS-1Lw, UNS-1Ew, and UNS-1Fw Universal FMS (Flight Management Systems). These are minor software changes to the GPS/SBAS (Global Positioning System/Satellite-Based Augmentation Systems) module intended to adjust the start date of the 1024-week cycle the internal GPS uses for date calculation.

The GPS week number rollover occurs every 1024 weeks, or about 19.6 years. After the 1023rd week rolls back to zero, software that is not coded to anticipate the rollover may stop working or cause the FMS to mistakenly display a date 20 to 40 years old.

With the current software, the correct date will be calculated up to May 31, 2025. With the new Mods software, the correct date will be calculated up to Dec 8, 2040.

If your Universal FMS needs repairs we recommend that you have this SB installed at that time. Universal Avionics will not cover the cost of labor or the removal and replacement of units but will pay to have the unit returned if it is still under warranty.

In the United States, the modifications described in these SBs may only be installed by Universal Avionics or Duncan Aviation Component Repair Services. Contact a Duncan Aviation Customer Account Rep to schedule your service.

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