Type certificate H4NM
Held today by Bell Textron INC., earlier by Williams Helicopter\Unc Helicopter, Inc.\Us Helicopter, INC., Williams Helicopter\Unc Helicopter\Us Helicopter, INC.. It covers 3 models; about 404 aircraft on the U.S. register are built to it. Last revised April 14, 2021 (revision 12). 33 FAA orders name its designs, and 12 approved modifications build on it.
Models under this certificate 3
TH-1L, UH-1E, UH-1L
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 33 · newest first
2024-10-112024-19-17 · Rotorcraft flight control · flight controls
2023-06-222023-11-07 · Ground Proximity System · instruments and avionics
2022-12-272022-20-14 · Main Rotor Gearbox · rotorcraft systems
2022-11-222022-22-12 · Nose/Tail Landing Gear Structure/Axle · landing gear
2022-11-162022-21-11 · Main rotor blades · rotorcraft systems
2022-04-202022-05-10 · Cabin Equipment/Furnishings · cabin, seats and restraints
2022-03-162022-06-05 · Main Rotor System · rotorcraft systems
2021-12-092021-23-13 · Ground Proximity System · instruments and avionics
Approved modifications 12 · 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/H4NM.json.