Type certificate 4A28
Held today by The Boeing Company. It covers 2 models. Last revised May 1, 1973 (revision 8). 139 approved modifications build on it.
Models under this certificate 2
720B Series, 720 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 0 · newest first
None in the current files.
Approved modifications 139 · 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/4A28.json.