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Aircraft STC directory

Helio Aircraft H-391 (USAF UL-24) STCs

The Jun 30, 2026 FAA DRS snapshot contains 8 selected supplemental type certificates with status Current whose public applicability data names the Helio Aircraft H-391 (USAF UL-24). Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

8
listed Current at snapshot
6
holder directories
5
modification categories
May 24, 2019
latest recorded revision

Modification demand surface

Avionics3
Other aircraft modifications2
Flight controls1
Fuel systems1
Aircraft structures1

Recorded holders

Brittain Industries, Inc2JAARS Inc.2Garmin International Inc1Avidyne Corporation1True Lock LLC1FFC Manufacturing1

Recently revised H-391 (USAF UL-24) STCs

Showing the 8 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.