SR00073DE
Replacement of Lycoming T53-L-13 series powerplant. Held by Midwest Aerospace Tc LLC, which holds 11 approved modifications in all. Last revised February 8, 2023. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Garlick Helicopters Inc.; Garlick Helicopters Inc.; Hawkins & Powers Aviation Inc.; International Helicopters Inc.; Williams Helicopter Corporation; Richards Heavylift Helo Inc.
- Models
- UH-1B, UH-1B, UH-1B, UH-1B, UH-1B, UH-1B
- Type certificates
- H3NM, H13WE, H1RM, H5SO, H7SO, H3SO
- On this site
- Garlick Helicopters Inc UH-1 10 registered
Williams Helicopter Corp UH-1 7 registered - The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 7, 2026.