STC SA4-683
FAA DRS lists SA4-683 as Current · Reissued, held by Atlantic Coast Sea Planes LLC, for Grumman American Aviation G-21 and Grumman American Aviation G-21A. Recorded change: Installation of auxiliary fuel tanks in outboard wing sections. Snapshot dated June 30, 2026.
Recorded modification
What the FAA record covers
SA4-683 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 fuel systems STCs
Installation of replacement fuel cell assemblies.
FAA holder: FFC Manufacturing
Installation of replacement fuel cell assemblies.
FAA holder: FFC Manufacturing
Installation of replacement fuel cell assemblies.
FAA holder: FFC Manufacturing
Installation of replacement fuel cell assemblies.
FAA holder: FFC Manufacturing
FAA record reference
- STC number
- SA4-683
- Product
- Aircraft · Single-Engine
- Country
- United States
- Application date
- April 2, 1962
- Revision date
- March 7, 2008
- CFR references
- Part 21