Type certificate ATC 681
Held today by Ryan Aeronautical Company. It covers 1 model; about 9 aircraft on the U.S. register are built to it. 3 approved modifications build on it.
Models under this certificate 1
ST-A Special
On this site
The data sheet on the FAA's site: the approved engines and propellers, weights, speeds and limits for each model.
FAA orders on these designs 0 · newest first
None in the current files.
Approved modifications 3 · companies holding the most
Source: FAA type certificate data sheets (Dynamic Regulatory System); register counts from the FAA register of October 7, 2026. Connections as data: /graph/certificate/ATC 681.json.