SR00119DE
Installation of an upgraded 42 degree Tail Rotor gearbox, P/N 212-040-003, and Control Cables. Held by Midwest Aerospace Tc LLC, which holds 11 approved modifications in all. Last revised February 8, 2023. System: rotorcraft systems.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Rotorcraft Development Corporation; Rotorcraft Development Corporation; Rotorcraft Development Corporation; Rotorcraft Development Corporation; Rotorcraft Development Corporation; Rotorcraft Development Corporation; International Helicopters Inc.; Overseas Aircraft Support Inc; Overseas Aircraft Support Inc; Overseas Aircraft Support Inc; Smith Helicopters; Richards Heavylift Helo Inc.; Bell Helicopter Textron Inc.; Bell Helicopter Textron Inc.; Bell Helicopter Textron Inc.; West Coast Fabrications; Hawkins & Powers Aviation Inc.
- Models
- UH-1B, UH-1B, HH-1K, TH-1L, UH-1E, UH-1L, UH-1B, TH-1L, UH-1E, UH-1L, UH-1E, UH-1B, TH-1L, UH-1E, UH-1L, UH-1E, UH-1B
- Type certificates
- H13WE, H3NM, H5NM, H5NM, H5NM, H5NM, H5SO, H7SO, H7SO, H7SO, H8NM, H3SO, H4NM, H4NM, H4NM, H9NM, H1RM
- On this site
- Bell HH-1 13 registered
Bell UH-1 Huey (Iroquois) 404 registered - The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 7, 2026.