STC SA4-677
FAA DRS lists SA4-677 as Current 路 Reissued, held by Atlantic Coast Sea Planes LLC, for Grumman American Aviation G-21A and Grumman American Aviation G-21. Recorded change: Installation of Picture Window. Snapshot dated June 30, 2026.
Recorded modification
What the FAA record covers
SA4-677 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-21A and Grumman American Aviation G-21. Confirm the approved model list, serial effectivity, configuration, and certificate revision.
Related aircraft structures STCs
Modify fuselage structure for installation on Beech model 3NM, serial number CA-145 ONLY.
FAA holder: Staggerwing Museum Foundation Inc.
Installation of cockpit exterior door on left side.
FAA holder: Staggerwing Museum Foundation Inc.
Installation of cockpit exterior door.
FAA holder: Staggerwing Museum Foundation Inc.
Installation of pilot cockpit door.
FAA holder: Staggerwing Museum Foundation Inc.
FAA record reference
- STC number
- SA4-677
- Product
- Aircraft 路 Single-Engine
- Country
- United States
- Application date
- September 22, 1958
- Revision date
- March 7, 2008
- CFR references
- Part 21