SH1007SW
Modify tail rotor pitch change mechanism to add duplex bearing, (P/N 47-641-131-1) in place of single row bearing. Approved for Bell models 47D1, 47G, and 47G-2 with 47-640-044 tail rotor gear box assembly. Held by Texas Helicopter CO. INC, which holds 4 approved modifications in all. Last revised December 15, 2010. System: rotorcraft systems.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc
- Models
- 47D1, 47G, 47G-2
- Type certificates
- H-1, H-1, H-1
- On this site
- Bell-Carson 47 5 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 8, 2026.