SA09120AC-DOther aircraft modifications
Installation of S-TEC System 55/55X Two Axis automatic flight guidance system, Model ST-603.
FAA holder: S-TEC Corporation
Aircraft STC directory
Textron Aviation T337H-SP STCs
The Jun 30, 2026 FAA DRS snapshot contains 3 selected supplemental type certificates with status Current whose public applicability data names the Textron Aviation T337H-SP. 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
2
modification categories
Aug 3, 2021
latest recorded revision
Modification demand surface
Other aircraft modifications2
Flight controls1
Recorded holders
Recently revised T337H-SP STCs
Showing the 3 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SA1627WEFlight controls
Installation of drooped ailerons in flaps down mode, recontoured wing leading edge, stall fences, aileron centering springs, conical cambered wing tips and flap actuated elevator trim spring.
FAA holder: Sierra Industries Ltd.
SA02700ATOther aircraft modifications
Installation of Air Conditioner System.
FAA holder: Aviation Enterprises