# STC ST663SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Eastern Airlines Inc, United States
- Description: Installation of LORAN A navigation system. (727-25)
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C36B24C663D7907B862570C200618E56.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST663SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727 ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

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