# STC SH506GL

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Helicopters, Inc, United States
- Description: Installation of modified tail rotor gearbox using original installation hardware and components.
- Status date: February 20, 1981
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H-1](https://openairdocs.org/tcds/H-1)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D3E84B5C6276C66885256CC2005C32C3.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SH506GL

## ADs that name it (0)

None.

## Approved models (8)

- Bell Helicopter Textron 47B ([TCDS H-1](https://openairdocs.org/tcds/H-1))
- Bell Helicopter Textron 47B3 ([TCDS H-1](https://openairdocs.org/tcds/H-1))
- Bell Helicopter Textron 47D (USAF H-13B) ([TCDS H-1](https://openairdocs.org/tcds/H-1))
- Bell Helicopter Textron 47D1 Series ([TCDS H-1](https://openairdocs.org/tcds/H-1))
- Bell Helicopter Textron 47E (Navy HTL-3) ([TCDS H-1](https://openairdocs.org/tcds/H-1))
- Bell Helicopter Textron 47G Series ([TCDS H-1](https://openairdocs.org/tcds/H-1))
- Bell Helicopter Textron 47G-2 (USAF H-13H) ([TCDS H-1](https://openairdocs.org/tcds/H-1))
- Bell Helicopter Textron 47H-1 ([TCDS H-1](https://openairdocs.org/tcds/H-1))

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.