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Aircraft structures

STC SA4-677

FAA DRS lists SA4-677 as Current · 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.

FAA-listed holder
Atlantic Coast Sea Planes LLC
Aircraft configurations
2
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Installation of Picture Window.

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.

Grumman American Aviation G-21A654Grumman American Aviation G-21654

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Grumman American Aviation G-21A and Grumman American Aviation G-21 model, serial range, and configuration?
  2. 02Which configuration, loads, materials, inspections, and damage limits apply?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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