# STC SH399GL

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Astronautics Corporation of America, United States
- Description: Installation of Astronautics helicopter 3Q flight director system.
- Status date: March 20, 1980
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H1NE](https://openairdocs.org/tcds/H1NE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DA3853A0EF93D02185256CC2005C31A7.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH399GL

## ADs that name it (0)

None.

## Approved models (1)

- Sikorsky Aircraft Corporation S-76A ([TCDS H1NE](https://openairdocs.org/tcds/H1NE))

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.