# STC ST672SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Eastern Airlines Inc, United States
- Description: Installation of encoding altimeter, ATC transponder, and associated system.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A22](https://openairdocs.org/tcds/4A22)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2C12121487209081862570C200618A67.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST672SO

## ADs that name it (0)

None.

## Approved models (1)

- Lockheed Aircraft Corporation 188A ([TCDS 4A22](https://openairdocs.org/tcds/4A22))

---
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.