Type certificate E-274
Held today by Lycoming Engines, earlier by Textron Lycoming. It covers 60 models; about 28,795 aircraft on the U.S. register are built to the designs it names. Last revised April 30, 2013 (revision 22). 35 FAA orders name its designs, and 71 approved modifications build on it.
Models under this certificate 60
O-320-H3BD, O-320-D2G, O-320-E2G, O-320-D3G, O-320-C2B, O-320-E2B, O-320-E2C, O-320-D2H, O-320-B3B, O-320-H2BD, O-320-B2D, O-320-C3A, O-320-C2A, O-320-E3H, O-320-H2AD, O-320-D2A, O-320-A1B, O-320-A2A, O-320-D2J, O-320-D1F, O-320-D1A, O-320-E2H, O-320-B3A, O-320-E3D, O-320-C1A, O-320-E1A, O-320-E2A, O-320-B2E, O-320-B2A, O-320-A3A, O-320-C3C, O-320-C2C, O-320-D1B, O-320-A3B, O-320-D2F, O-320-B2C, O-320-D2B, O-320-E1J, O-320-A2C, O-320-E2F, O-320-A1A, O-320-E1F, O-320-A2B, O-320-D2C, O-320-A3C, O-320-E1B, O-320-D1C, O-320-E2D, O-320-C1B, O-320-D1D, O-320-H3AD, O-320-B1A, O-320-B2B, O-320-E1C, O-320-B3C, O-320-A2D, O-320-C3B, O-320-B1B, O-320-H1BD, O-320-H1AD
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 35 · newest first
Approved modifications 71 · 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-274.json.