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Aircraft STC directory

Grumman American Aviation G-21 STCs

The Jun 30, 2026 FAA DRS snapshot contains 17 selected supplemental type certificates with status Current whose public applicability data names the Grumman American Aviation G-21. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

17
listed Current at snapshot
4
holder directories
6
modification categories
Oct 23, 2024
latest recorded revision

Modification demand surface

Other aircraft modifications9
Aircraft structures4
Landing gear and brakes1
Aircraft performance1
Cabin and interiors1
Fuel systems1

Recorded holders

Atlantic Coast Sea Planes LLC14Wipaire Inc1Kaman Corporation Aircraft Wheel and Brake LLC1Alaska Coastal Airlines1

Recently revised G-21 STCs

Showing the 17 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.