Type certificate A9SW
Held today by Air Tractor INC.. It covers 6 models; about 133 aircraft on the U.S. register are built to the designs it names. Last revised March 6, 2001 (revision 12). 25 FAA orders name its designs, and 107 approved modifications build on it.
Models under this certificate 6
AT-301, AT-400, AT-250, AT-300, AT-302, AT-400A
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 25 · newest first
2021-04-292021-05-14 · TE flap control system · flight controls
2009-06-012009-11-05 · Cracks in the engine mount · engine
2009-05-052006-08-08 R1 · Wing lower spar cap · airframe structure
2009-01-282008-26-01 · Overturn skid plate kit · other and general
2008-07-072008-11-17 · Overturn skid plate in the cockpit area · other and general
2008-06-122008-10-12 · Cracks in the engine mount · engine
2008-05-082008-09-10 · Aluminum spar caps · engine
2006-04-212006-08-08 · Wing lower spar cap · airframe structure
Approved modifications 107 · 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/A9SW.json.