EASA SIB SW-11-39
FreeFlight Systems (formerly Trimble) 2000 and 2101 Approach (series) GPS navigation units
Summary
The Special Airworthiness Information Bulletin SAIB: SW-11-39 is an FAA advisory concerning FreeFlight Systems (formerly Trimble) 2000 and 2101 Approach series GPS navigation units. It addresses service difficulties related to software version 24xM, which causes long computational delays during flight planning operations in affected GPS units. This bulletin does not apply to specific aircraft or engine models but focuses on the GPS navigation equipment used in various aircraft.
What Changed
SAIB SW-11-39 highlights the identification of software-related delays in FreeFlight Systems 2000 and 2101 Approach GPS units following the release of software version 24xM in 2008. It introduces the availability of Service Information Letter SIL FFS08 and six model-specific service bulletins that provide maintenance actions to correct these delays. The bulletin clarifies that the issue is not currently considered an unsafe condition warranting an airworthiness directive.
Why It Matters
This information is important for aviation professionals because the computational delays can affect flight planning efficiency and the timeliness of turn advisories, potentially impacting situational awareness during flight. Operators and maintenance teams need to be aware of these issues to ensure GPS units function correctly and to avoid operational disruptions. Compliance with the recommended service bulletins helps maintain navigation reliability and safety.
What To Do
Operators of FreeFlight Systems 2000 and 2101 Approach GPS units should promptly obtain and apply the software revisions and maintenance actions described in SIL FFS08 and the associated service bulletins. They should contact FreeFlight Systems to request the appropriate software updates for their specific GPS models. There is no mandatory compliance deadline stated, but timely action is strongly encouraged to prevent operational delays.
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