During a production flight test conducted on a Night VFR equipped P2008 JC a/c, an incorrect VOR deviation bar deflection on Garmin GNC 255 unit, which may lead to pilot disorientation was detected.
Garmin, as avionics manufacturer, was made aware of the issue and found that it is caused by incorrect data sent by GNC 255 when connected to an external EFIS through RS-232 data-bus.
Garmin released a new software build for GNC 255 unit in order to fix the problem. Tecnam identified as mandatory corrective action for solving the incorrect indication issue to upload the new GNC 255 software build (p/n: 006-B1374-05).
Tecnam P2008 Service Bulletins
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