GTX 345R transponders installed in G950 equipped (Cutter) PA-46 and G1000 equipped PA-46-350P, PA-46R-350T (Phase I and II) aircraft with GDU software versions ranging between 12.XX and 14.XX are affected.
Mandatory: STC Service Bulletin 1641 must be accomplished within the next 5 hours of operation.
The GTX 345R transponder installation uses the GTX 3X5 G1000 Interface Card 4, v2494.00, P/N: 006-B2494-00 to configure the GIA 1 and GIA 2.
These discrete outputs are incorrectly configured to do the following:
- ALERT DSCRT 1 – ALERT DSCRT 1 activates the TRIM-in-motion indicator when there is a TAWS alert. It will not annunciate actual trim in motion.
- OVERSPEED WARN – OVERSPEED WARN activates the OVERSPEED Horn when there is a TAWS alert. It will not provide an aural alert in an actual overspeed.
- FUEL RETURN – FUEL RETURN activates the Low Fuel Temperature indication when the aircraft is airborne. It will not annunciate if fuel temperature is ≤ -10°F.
Refer to Table 1 (see linked notification below) for a list of the affected aircraft models.