Replacement of the Lycoming Model T53-L-13B engine with a Lycoming Model T53-L-703 engine flat rated to the same power settings specified in Type Certificate Data Sheet (TCDS) H15NM.
FAA holder: Overseas Aircraft Support Inc.
Aircraft STC directory
The Jun 30, 2026 FAA DRS snapshot contains 29 selected supplemental type certificates with status Current whose public applicability data names the Hagglund Helicopters UH-1H. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
Showing the 29 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
FAA holder: Overseas Aircraft Support Inc.
FAA holder: Isolair Inc.
FAA holder: Isolair Inc.
FAA holder: Isolair Inc.
FAA holder: Midwest Aerospace TC LLC
FAA holder: Midwest Aerospace TC LLC
FAA holder: Midwest Aerospace TC LLC
FAA holder: Aircraft Structural Repair Inc.
FAA holder: Helicopter Technology Co
FAA holder: Northwest Heli-Structures Inc
FAA holder: Dart Aerospace USA Inc.
FAA holder: BLR Aerospace LLC.
FAA holder: BLR Aerospace LLC.
FAA holder: Airwolf Aerospace LLC
FAA holder: AKV Inc.
FAA holder: VTOL LLC
FAA holder: Vector Aerospace Helicopter Services USA Inc.
FAA holder: Vector Aerospace Helicopter Services USA Inc.
FAA holder: Dart Aerospace Limited
FAA holder: Simplex Manufacturing Company
FAA holder: Minuteman Aviation Inc.
FAA holder: Van Horn Aviation LLC
FAA holder: Bell Helicopter Textron Inc.
FAA holder: Bell Helicopter Textron Inc.
FAA holder: Bell Helicopter Textron Inc.
FAA holder: Aviation Development Corporation
FAA holder: Dart Aerospace Limited
FAA holder: Dart Aerospace Limited