SA5684NM
Installation of Lycoming GSO/IGSO-480 engine; Hartzell HC-A3V20 propeller; new nacelle and engine mount; modified front and rear spar and aft firewall; and associated systems. Held by Mchugh Aviation INC, which holds 14 approved modifications in all. Last revised June 25, 2004. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Sky Enterprises Inc.
- Models
- RC-3
- Type certificate
- A-769
- 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 22, 2026.