Type certificate E-277
Held today by Lycoming Engines, earlier by Textron Lycoming, Avco Corporation. It covers 3 models; about 66 aircraft on the U.S. register are built to the designs it names. Last revised November 4, 2010 (revision 6). 13 FAA orders name its designs, and 18 approved modifications build on it.
Models under this certificate 3
O-340-A2A, O-340-B1A, O-340-A1A
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 13 · newest first
2026-04-082026-04-11 · Engine (Reciprocating) · engine
2024-12-052024-21-02 · Engine (Reciprocating) · engine
2012-03-272012-03-07 · Carburetor · engine
2004-06-252004-10-14 · Crankshaft gear · engine
1997-08-1297-15-11 · Cylinder kits · engine
1992-07-1092-12-05 · Piston Pins · engine
1991-05-2890-04-06 R1 · Propeller Governor External Oil Line · engine
1989-09-0187-10-06 R1 · Rocker Arm Assembly · engine
Approved modifications 18 · 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-277.json.