SE769NW
Installation of Soloy Part No. 250-1001-1 fuel line. Held by Siam Hiller Holdings INC, which holds 27 approved modifications in all. Last revised April 15, 2009. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.
- Models
- 250-C20, 250-C18, 250-C20B
- Type certificates
- E4CE, E4CE, E4CE
- 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 19, 2026.