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Aircraft performance

STC SA4-591

FAA DRS lists SA4-591 as Current · Surrendered, held by Alaska Coastal Airlines, for Grumman American Aviation G-21A and Grumman American Aviation G-21. Recorded change: Increased maximum weight capacity of bow compartment. Snapshot dated June 30, 2026.

FAA-listed holder
Alaska Coastal Airlines
Aircraft configurations
2
FAA revision date
FAA status
Current · Surrendered

Recorded modification

What the FAA record covers

Increased maximum weight capacity of bow compartment.

SA4-591 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 limits, loading assumptions, performance data, and supplements 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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