SH446EA
Installation of Franklin engine Model 6V-350B in Fairchild Hiller UH-12A helicopter. Held by Franklin Engine CO INC, which holds 7 approved modifications in all. Last revised June 30, 1970. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Hiller Aviation; Hiller Aviation; Hiller Aviation; Hiller Aviation; Rogerson Hiller Corporation; Rogerson Hiller Corporation
- Models
- UH-12 Series, UH-12 Series, UH-12L, UH-12L4, UH-12E, UH-12E-L
- Type certificates
- 6H1, 6H2, H1WE, H1WE, 4H11, 4H11
- On this site
- Hiller UH-12 217 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 21, 2026.