SA02679SEAircraft performance
Increase in gross weight to 12,500 pounds.
FAA holder: Snow Goose Aviation LLC
Aircraft STC directory
Atlantic Coast Seaplanes G-21C STCs
The Jun 30, 2026 FAA DRS snapshot contains 6 selected supplemental type certificates with status Current whose public applicability data names the Atlantic Coast Seaplanes G-21C. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
6
listed Current at snapshot
2
holder directories
4
modification categories
Jan 21, 2026
latest recorded revision
Modification demand surface
Aircraft performance2
Avionics2
Aircraft structures1
Other aircraft modifications1
Recorded holders
Recently revised G-21C STCs
Showing the 6 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SA02571SE (PAGE 1)Avionics
Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).
FAA holder: Garmin International Inc.
SA02153LA-D PAGE 1Avionics
Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System.
FAA holder: Garmin International Inc.
SA01734SE (PG 3)Aircraft structures
Application of Stewart Systems synthetic fabric covering system to aircraft fuselage, wings, tail surfaces, control surfaces and related parts.
FAA holder: Andrew D. Humphrey
SA02121SE (PAGE 1)Other aircraft modifications
Installation of Garmin GTS 825 (TAS) or GTS 855 (TCAS I) Traffic System.
FAA holder: Garmin International Inc
SA02168AK (PG 2)Aircraft performance
Installation of hourmeter airspeed switch. For unpressurized aircraft only. Pressurized aircraft must have pressurization system deactivated.
FAA holder: Avalaska Inc