STC SA4-681
FAA DRS lists SA4-681 as Current 路 Reissued, held by Atlantic Coast Sea Planes LLC, for Grumman American Aviation G-21 and Grumman American Aviation G-21A. Recorded change: Installation of dorsal fin. Snapshot dated June 30, 2026.
Recorded modification
What the FAA record covers
SA4-681 identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.
Applicability
Aircraft named in FAA DRS
Named aircraft: Grumman American Aviation G-21 and Grumman American Aviation G-21A. Confirm the approved model list, serial effectivity, configuration, and certificate revision.
Related other aircraft modifications STCs
Replacement of lighted No Smoking Signs with No Smoking Placards.
FAA holder: Georgian Aerospace Group Inc
Installation of a Composite Support Flange for the Inertial Separator Duct.
FAA holder: TruAtlantic Mfg., LLC
Installation of a Blue Sky Network D1000C Data Link System with ACH1000 Control Panel.
FAA holder: South Beach Aerospace Inc
FAA record reference
- STC number
- SA4-681
- Product
- Aircraft 路 Single-Engine
- Country
- United States
- Application date
- September 22, 1958
- Revision date
- March 7, 2008
- CFR references
- Part 21