SA1481CEEngine and powerplant
Installation of Pratt & Whitney (UACL) PT6A-27 turboprop engine and Hartzell HC-B3TN-3D/T10178CH reversible propeller.
FAA holder: Helio Alaska Inc.
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
Avionics3
Engine and powerplant1
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.
View record
SA09902ACAvionics
Installation of BendixKing KFD 900 Flight Display System.
FAA holder: Honeywell International Inc. (Bendix King)
SA02019SE-D (2 OF 3)Avionics
Installation of Garmin GTN 6XX/7XX Navigation System.
FAA holder: Garmin International Inc
SA00343BO (PAGE 2)Avionics
Installation of a single configuration or a dual configuration Avidyne Corporation Integrated Flight Display, Model IFD540 loaded with Release 10.0 software (or later FAA approved release).
FAA holder: Avidyne Corporation