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Aircraft STC directory

Helio Aircraft HST-550A (USAF AU-24A) STCs

The Jun 30, 2026 FAA DRS snapshot contains 3 selected supplemental type certificates with status Current whose public applicability data names the Helio Aircraft HST-550A (USAF AU-24A). 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
3
holder directories
1
modification categories
Sep 1, 2021
latest recorded revision

Modification demand surface

Avionics3

Recorded holders

Honeywell International Inc (Bendix King)1Garmin International Inc1Avidyne Corporation1

Recently revised HST-550A (USAF AU-24A) STCs

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