Type certificate TC 553
Held today by The Northrup Corporation. It covers 1 model. Last revised April 6, 1937 (revision 5)..
Models under this certificate 1
Delta 1-D (7 PCLM)
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.
Source: FAA type certificate data sheets (Dynamic Regulatory System); register counts from the FAA register of October 22, 2026. Connections as data: /graph/certificate/TC 553.json.