EASA SIB 2009-14
Garmin Global Positioning System (GPS) Navigation Units (400W / 500W series and GNS 480) — Upgrade to main unit software and GPS software
Summary
EASA Safety Information Bulletin SIB No. 2009-14 provides information on a software upgrade for Garmin Global Positioning System (GPS) Navigation Units, specifically the 400W / 500W series and GNS 480 models. These GPS units are installed on various Part 23 certificated aeroplanes and Part 27 certificated helicopters. The bulletin addresses software improvements to enhance navigation accuracy and reliability.
What Changed
The document introduces upgraded main unit and GPS software versions that correct several anomalies including flight plan sequencing, approach procedures with three-character airport identifiers, GPS/WAAS reception loss in specific regions, inaccurate VNAV advisories, and display issues. Additional fixes include improved map page panning, waypoint annunciation, and COM monitor behavior for the GNS 480. These changes enhance the operational performance and reliability of the affected Garmin GPS units.
Why It Matters
This upgrade is important for aviation professionals because it resolves known software anomalies that could affect navigation accuracy and situational awareness, especially during critical phases of flight such as approaches. Operators and maintenance teams benefit from improved system reliability and reduced nuisance alerts, which support safer and more efficient flight operations. Compliance with these recommendations helps maintain the airworthiness and operational integrity of aircraft equipped with these Garmin GPS units.
What To Do
Operators should assess whether their aircraft are affected by the described software anomalies and, if so, upgrade the GPS software accordingly. Although the recommendations are not mandatory, implementing the software upgrade is advised to ensure optimal GPS unit performance. Stakeholders can obtain the necessary service bulletins and advisories from Garmin dealers or the Garmin website. No explicit compliance deadline is stated.
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