ST00037AT
Unison igniter plugs, P/N 9044400-1. Held by Unison Industries, which holds 5 approved modifications in all. Last revised May 2, 1994. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.; Allison Engine Company Inc.
- Models
- 250-B17C, 250-B17, 250-B15G, 250-B17E, 250-B15E, 250-B17B, 250-B17F/2, 250-B15A, 250-B17D, 250-B17F, 250-B17F/1, 250-C28B, 250-C28C, 250-C30, 250-C28, 250-C30U, 250-C30G/2, 250-C30G, 250-C30S, 250-C30M, 250-C30L, 250-C30P, 250-C30R, 250-C20R/4, 250-C18, 250-C20R/1, 250-C10D, 250-C10, 250-C20F, 250-C10B, 250-C20J, 250-C20S, 250-C20B, 250-C19, 225-C10, 250-C18C, 225-C10A, 250-C20R/2, 250-C18B, 250-C20C, 250-C20, 250-C18A, 250-C20R, 250-C20W
- Type certificates
- E10CE, E10CE, E10CE, E10CE, E10CE, E10CE, E10CE, E10CE, E10CE, E10CE, E10CE, E1GL, E1GL, E1GL, E1GL, E1GL, E1GL, E1GL, E1GL, E1GL, E1GL, E1GL, E1GL, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, 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 5, 2026.