# STC SA1987SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Aviation Services Corporation, United States
- Description: Installation of Sperry 4 Tube EDZ-603 EFIS.
- Status date: August 14, 1986
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A22CE](https://openairdocs.org/tcds/A22CE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F141EC7DD09A629D85256CC10083D3C3.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1987SO

## ADs that name it (0)

None.

## Approved models (1)

- The Cessna Aircraft Company 550 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))

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