# STC ST390CH

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Elliott Aviation Technical Products, United States
- Description: Installation of a Sundstrand Mark VI Ground Proximity Warning System.
- Status date: July 20, 1995
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A16SW](https://openairdocs.org/tcds/A16SW)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1054610A56FF01C485256CC300035FE5.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST390CH

## ADs that name it (0)

None.

## Approved models (1)

- Raytheon Aircraft Company 400A ([TCDS A16SW](https://openairdocs.org/tcds/A16SW))

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