SA99GLOther aircraft modifications
Installation of Cleveland Main Wheels and Brakes.
FAA holder: Kaman Corporation Aircraft Wheel and Brake LLC
Aircraft STC directory
Grumman American Aviation G-21A STCs
The Jun 30, 2026 FAA DRS snapshot contains 18 selected supplemental type certificates with status Current whose public applicability data names the Grumman American Aviation G-21A. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
18
listed Current at snapshot
4
holder directories
5
modification categories
Sep 19, 2022
latest recorded revision
Modification demand surface
Other aircraft modifications11
Aircraft structures3
Fuel systems2
Aircraft performance1
Cabin and interiors1
Recently revised G-21A STCs
Showing the 18 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SA4-591Aircraft performance
Increased maximum weight capacity of bow compartment.
FAA holder: Alaska Coastal Airlines
SA108WECabin and interiors
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
SA1589WEOther aircraft modifications
Installation of two United Aircraft of Canada Ltd. Model PT6-20A engines.
FAA holder: Atlantic Coast Sea Planes LLC
SA1969WEOther aircraft modifications
Installation of passenger seats.
FAA holder: Atlantic Coast Sea Planes LLC
SA355WEOther aircraft modifications
Installation of hull vents.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-1055Other aircraft modifications
Rotary beacon installation.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-1109Aircraft structures
Metalizing of wings aft of spar.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-1550Aircraft structures
Installation of wing leading edge landing lights.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-1551Other aircraft modifications
Installation of electric gear retract motor.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-678Other aircraft modifications
Installation of new nose.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-680Other aircraft modifications
Installation of windshield.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-681Other aircraft modifications
Installation of dorsal fin.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-682Other aircraft modifications
Installation of retractable float.
FAA holder: Atlantic Coast Sea Planes LLC
SA4-683Fuel systems
Installation of auxiliary fuel tanks in outboard wing sections.
FAA holder: Atlantic Coast Sea Planes LLC
SA59WEFuel systems
ONE-ONLY STC, S/N B117: Installation of a Chandler Evans AN 4100 (P/N CE 9141-AA) electric driven emergency fuel pump in place of the standard hand pump and strainer (P/N NAF 38855 Type AEL-1). (G-21A N525, S/N B117).
FAA holder: Atlantic Coast Sea Planes LLC