Type certificate G4EA
Held today by K & L Soaring LLC, earlier by Schweizer Aircraft Corporation. It covers 3 models; about 581 aircraft on the U.S. register are built to it. Last revised November 29, 2010 (revision 9). 3 FAA orders name its designs, and 2 approved modifications build on it.
Models under this certificate 3
SGS 1-35A, SGS 1-35, SGS 1-35C
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 3 · newest first
1988-08-1987-17-01 · Tow Release Installation · other and general
1987-01-2187-02-01 · Tow-Release Installation Inspection · other and general
1971-08-2671-17-09 · Loose Rudder Fittings · flight controls
Approved modifications 2 · 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/G4EA.json.