# STC SA3-20

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Supreme Aircraft Service, United States
- Description: Warren McArthur seats 297 and and 297D (new designation297-ST) modified.
- Status date: January 1, 1960
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-757](https://openairdocs.org/tcds/A-757)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2F5450670DBB60D6862570CA00580E33.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3-20

## ADs that name it (0)

None.

## Approved models (1)

- Raytheon Aircraft Company C18 Series ([TCDS A-757](https://openairdocs.org/tcds/A-757))

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