Garmin G3X Touch EFIS Part 23 AML STC installations with a GSU 25 ADAHRS (not installed on the back of a Garmin GDU 4X0) performed using Master Drawing List 005-01320-00, Revision 4 or earlier (Installation Manual 190-02472-01 revision 4 or earlier) are affected.
Installations with the GSU 25 ADAHRS installed on the back of a Garmin GDU 4X0 are not affected by the bulletin.
Mandatory: This service bulletin is mandatory for certified G3X systems installed per G3X Part 23 AML STC SA01899WI.
Pitot and static lines may not have positive drainage. Pitot and static lines need to be inspected for positive drainage.