SR01349LA
Installation of Honeywell (Lycoming) T53-L-13B/-13BA engine to replace General Electric T58-GE-3 engine or T53-L-703 engine to replace Honeywell (Lycoming) T53-L-13B/-13BA engine. Held by Wsh, LLC, which holds 7 approved modifications in all. Last revised June 11, 2026. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Rotorcraft Development Corporation; Rotorcraft Development Corporation; Rotorcraft Development Corporation; Tamarack Helicopters Inc.; Tamarack Helicopters Inc.
- Models
- TH-1F, UH-1F, UH-1P, TH-1F, UH-1F
- Type certificates
- H12NM, H12NM, H12NM, H7NE, H7NE
- 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.