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Aircraft STC directory

Helio Aircraft HST-550 STCs

The Jun 30, 2026 FAA DRS snapshot contains 4 selected supplemental type certificates with status Current whose public applicability data names the Helio Aircraft HST-550. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

4
listed Current at snapshot
4
holder directories
2
modification categories
Aug 30, 2024
latest recorded revision

Modification demand surface

Avionics3Engine and powerplant1

Recorded holders

Helio Alaska Inc.1Honeywell International Inc (Bendix King)1Garmin International Inc1Avidyne Corporation1

Recently revised HST-550 STCs

Showing the 4 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.