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.
Aircraft STC directory
Atlantic Coast Seaplanes G-21G STCs
The Jun 30, 2026 FAA DRS snapshot contains 10 selected supplemental type certificates with status Current whose public applicability data names the Atlantic Coast Seaplanes G-21G. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
10
listed Current at snapshot
6
holder directories
6
modification categories
Dec 12, 2023
latest recorded revision
Modification demand surface
Avionics4
Other aircraft modifications2
Aircraft structures1
Propellers1
Electrical systems1
Aircraft performance1
Recently revised G-21G STCs
Showing the 10 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SA02632SEAvionics
Installation of a Pratt and Whitney PT6A-35 engine flat rated to existing horsepower of the original Pratt and Whitney PT6A-28 and associated instrument marking changes.
FAA holder: Teufel Nursery Inc
SA02153LA-D PAGE 1Avionics
Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System.
FAA holder: Garmin International Inc.
SA02444AK (PAGE 2)Avionics
Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed.
FAA holder: ADS-B Technologies LLC
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
SP00400SEPropellers
Installation of various propeller electrical de-icer models.
FAA holder: SMR Technologies
SA01606SEElectrical systems
Installation of an electrical/electronics system including contemporary electronic appliances, control devices and interface wiring in accordance with Teufel Nursery, Inc. MDL G21G-00006-01, Revision -1, dated August 12, 2005 or later approved MDL on Aero Planes, LLC, Model G-21G, s/n 1201.
FAA holder: Teufel Nursery Inc
SA8075SW (PAGE 2)Other aircraft modifications
Installation of fiberglass covering. (M-62 SERIES PT-19) (G-73 SCHWEIZER).
FAA holder: Razorback Fabrics 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