# STC ST857SO

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Delta Airlines Inc, United States
- Description: Installation of Bendix ground proximity warning system.
- Status date: November 14, 1975
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5C80735CE18E452D85256CC3000374B6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST857SO

## ADs that name it (0)

None.

## Approved models (2)

- McDonnell Douglas Corporation DC-8-51 ([TCDS 4A25](https://openairdocs.org/tcds/4A25))
- McDonnell Douglas Corporation DC-8-61 ([TCDS 4A25](https://openairdocs.org/tcds/4A25))

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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.