Type certificate 4H10
Held today by Siam Hiller Holdings INC., earlier by Hiller Aviation. It covers 1 model; about 217 aircraft on the U.S. register are built to it. Last revised October 28, 2014 (revision 7). 60 FAA orders name its designs, and 49 approved modifications build on it.
Models under this certificate 1
UH-12D
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 60 · newest first
2025-09-242025-15-02 · Main Rotor Mast/Swashplate · rotorcraft systems
2023-06-222023-11-07 · Ground Proximity System · instruments and avionics
2021-12-092021-23-13 · Ground Proximity System · instruments and avionics
2001-01-102000-24-21 · Control System Linkage · other and general
1997-11-1297-20-15 · Outboard Tension-Torsion Bar Pin · rotorcraft systems
1997-06-2797-10-16 · Blade Spar Tube and Cuff Inspection · rotorcraft systems
1991-03-0790-15-01 · Tail Rotor Blade Assemblies · rotorcraft systems
1986-11-0386-22-04 · Main Rotor Blades · rotorcraft systems
Approved modifications 49 · 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/4H10.json.