Type certificate A20SO
Held today by Piper Aircraft INC.. It covers 4 models; about 935 aircraft on the U.S. register are built to it. Last revised January 26, 2022 (revision 13). 114 FAA orders name its designs, and 365 approved modifications build on it.
Models under this certificate 4
PA-31, PA-31-325, PA-31-300, PA-31-350
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 114 · newest first
2022-03-212022-03-15 · Fuel Quantity Indicator · fuel system
2017-06-292017-10-20 · Fuselage--Main Bulkhead · airframe structure
2017-02-222017-02-06 · Electrical Power/Electrical Power System Wiring · electrical power
2016-06-062016-08-18 · Engine Fuel and Control · engine
2016-04-152016-05-01 · Fuselage · airframe structure
2016-01-122015-24-05 · PLACARDS AND MARKINGS; Interior Placards · fuel system
2014-12-182014-23-03 · Engine Exhaust · engine
2013-07-172013-10-04 · Engine Exhaust · engine
Approved modifications 365 · 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/A20SO.json.