STC SA4-681
FAA DRS lists SA4-681 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 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.
Buyer checks
Confirm before sourcing
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