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Aircraft STC directory

Boeing DC-4 STCs

The Jun 30, 2026 FAA DRS snapshot contains 5 selected supplemental type certificates with status Current whose public applicability data names the Boeing DC-4. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

5
listed Current at snapshot
4
holder directories
3
modification categories
May 13, 2022
latest recorded revision

Modification demand surface

Other aircraft modifications3
Engine and powerplant1
Landing gear and brakes1

Recorded holders

United Aeronautical Corporation2FTG, Inc.1Airwolf Filter Corporation1Aviation Products Systems Inc.1

Recently revised DC-4 STCs

Showing the 5 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.