# STC SA4-601

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Catalina Limited, United States
- Description: Forward double couch structure and aft double couch structure.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 785](https://openairdocs.org/tcds/785)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2ED0C86C784045A2862570D000789E50.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-601

## ADs that name it (0)

None.

## Approved models (1)

- General Dynamics Corporation 28-5ACF ([TCDS 785](https://openairdocs.org/tcds/785))

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