Type certificate 1A4
Held today by Piper Aircraft INC.. It covers 6 models; about 323 aircraft on the U.S. register are built to it. Last revised August 7, 2006 (revision 24). 26 FAA orders name its designs, and 317 approved modifications build on it.
Models under this certificate 6
PA-20, PA-20S-135, PA-20-135, PA-20S-115, PA-20-115, PA-20S
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 26 · newest first
2025-03-202025-02-11 · Rudder Structure · flight controls
2022-03-212022-03-15 · Fuel Quantity Indicator · fuel system
2015-06-032015-08-04 · Wings · landing gear
2014-01-1499-01-05 R1 · Wings · landing gear
2006-03-102006-03-08 · Vacuum pumps · instruments and avionics
2005-02-232005-01-19 · Mode S transponders · instruments and avionics
2001-12-282001-23-17 · GNS 430 units · instruments and avionics
1999-02-0899-01-05 · Wing Lift Struts or Forks · landing gear
Approved modifications 317 · 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/1A4.json.