Type certificate E-228
Held today by Lycoming Engines, earlier by Textron Lycoming, Avco Corporation. It covers 20 models; about 399 aircraft on the U.S. register are built to the designs it names. Last revised June 23, 2010 (revision 17). 11 FAA orders name its designs, and 29 approved modifications build on it.
Models under this certificate 20
O-435-A, O-435-A2, O-435, GO-435-C2B1, O-435-C2 (O-435-13), O-435-K, GO-435-C2A, GO-435-C2E, GO-435-C2 (O-435-17), GO-435-C2B, GO-435-C2D, GO-435, GO-435-C2C, GO-435-D1, GO-435-C2A2, O-435-C1 (O-435-11), O-435-C (O-435-1), O-435-B (O-435-5), O-435-K1 (O-435-4), GO-435-C2B2
Engine series
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 11 · newest first
Approved modifications 29 · companies holding the most
Source: FAA type certificate data sheets (Dynamic Regulatory System); register counts from the FAA register of October 5, 2026. Connections as data: /graph/certificate/E-228.json.