SH828NW
Installation of weighing system. (AS MODIFIED BY STC SH657NW). Held by Onboard Weighing Systems, which holds 11 approved modifications in all. Last revised September 6, 1979. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc; Scotts-Bell 47 Inc
- Models
- 47, 47B, 47B3, 47D, 47D1, 47E, 47G-2, 47G, 47H-1
- Type certificates
- H-1, H-1, H-1, H-1, H-1, H-1, H-1, H-1, H-1
- On this site
- Bell 47 477 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.