# STC SA3-387

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Rockwell Intl, United States
- Description: Air stair door installation.
- Status date: October 1, 1970
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-757](https://openairdocs.org/tcds/A-757), [TCDS A-765](https://openairdocs.org/tcds/A-765)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3ADD26A21F44BCB185256CC20008CC55.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3-387

## ADs that name it (0)

None.

## Approved models (2)

- Raytheon Aircraft Company 18 Series ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company C18 Series ([TCDS A-757](https://openairdocs.org/tcds/A-757))

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