Type certificate 1E7
Held today by Lycoming Engines, earlier by Textron Lycoming, Avco Corporation. It covers 8 models; about 48 aircraft on the U.S. register are built to it. Last revised June 23, 2010 (revision 7). 14 FAA orders name its designs, and 20 approved modifications build on it.
Models under this certificate 8
IGSO-540-A1F, IGSO-540-B1A, IGSO-540-A1H, IGSO-540-A1C, IGSO-540-A1A, IGSO-540-B1C, IGSO-540-A1D, IGSO-540-A1E
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 14 · newest first
2022-08-152022-16-03 · Engine (RECIPROCATING) · engine
2012-02-242012-03-06 · Fuel servo diaphragm · 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
1981-02-1181-03-05 · Mixture Control Shaft Assembly · engine
1979-09-2679-04-05 · Regulator Diaphragm Stem Assembly · engine
1978-11-0778-23-10 · Center Body Bellows Seal Assembly · engine
Approved modifications 20 · 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/1E7.json.