# STC SA3023SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Delta Airlines Inc, United States
- Description: Installation of dual Collins high frequency radio systems.
- Status date: October 7, 1991
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A2NM](https://openairdocs.org/tcds/A2NM)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/ABEF3CC6213DC12D85256CC2000A92CF.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3023SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 757-200 Series ([TCDS A2NM](https://openairdocs.org/tcds/A2NM))

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