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.
Modification demand surface
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.
Installation of Cleveland Main Wheels and Brakes.
FAA holder: Kaman Corporation Aircraft Wheel and Brake LLC
Increased maximum weight capacity of bow compartment.
FAA holder: Alaska Coastal Airlines
Modification of bulkhead station 26, blkd sta 33, cabin floor from Sta 13-29 and addition of bouyant tank between Sta 29-31.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of hull vents.
FAA holder: Atlantic Coast Sea Planes LLC
Rotary beacon installation.
FAA holder: Atlantic Coast Sea Planes LLC
Metalizing of wings aft of spar.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of retractable tip floats.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of wing leading edge landing lights.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of electric gear retract motor.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of new nose.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of windshield.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of dorsal fin.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of retractable float.
FAA holder: Atlantic Coast Sea Planes LLC
Installation of auxiliary fuel tanks in outboard wing sections.
FAA holder: Atlantic Coast Sea Planes LLC