Type certificates · propeller · current

Type certificate P-257

Held today by Hamilton Standard Division. It covers 2 models. Last revised November 1, 1977 (revision 6). 19 approved modifications build on it.

Models under this certificate 2

12DX, 12D40

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 19 · companies holding the most

Pacific Propeller International LLC 6 Schweis Robert W 5 Northwest Propeller Services INC. 2 Aircraft Development CO 2 Metropolitan Propeller Repair, INC 1 Mcfarlane Aviation, INC. 1 Canyon Oaks Propeller D/B/A H & Propeller Shop INC. 1 American Propeller Service 1

Source: FAA type certificate data sheets (Dynamic Regulatory System); register counts from the FAA register of October 7, 2026. Connections as data: /graph/certificate/P-257.json.