SA4774NM
Removal of the two existing engines and installation of one AVCO Lycoming Model TIO-540-J2BD and one LTIO-540-J2BD engine with Hartzell Model HC-C3YR-2UF/FC9587A-10 and HC-C3YR-2LUF/FJC9587A-10 propellers. Held by Widgeonworks LLC, which holds 22 approved modifications in all. Last revised April 9, 2026. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Gulfstream American Corporation; Gulfstream American Corporation; Gulfstream American Corporation
- Models
- G-44, G-44A, SCAN Type 30
- Type certificates
- A-734, A-734, A-734
- On this site
- Grumman SCAN TYPE 30 8 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 20, 2026.