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Aircraft STC directory

Sikorsky Aircraft S-58BT STCs

The Jun 30, 2026 FAA DRS snapshot contains 3 selected supplemental type certificates with status Current whose public applicability data names the Sikorsky Aircraft S-58BT. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

3
listed Current at snapshot
2
holder directories
2
modification categories
Feb 21, 2023
latest recorded revision

Modification demand surface

Other aircraft modifications2
Cargo and special mission1

Recorded holders

Onboard Systems International1National Aircraft Service Inc1

Recently revised S-58BT STCs

Showing the 3 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.