# STC SA1-321

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Reading Avn Svc Inc, United States
- Description: Airstair door.
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-807](https://openairdocs.org/tcds/A-807)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2EA9B1CB74D6CD0085256CC1007F3BF2.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1-321

## ADs that name it (0)

None.

## Approved models (1)

- The de Havilland Aircraft Co. Ltd (England) DH 104 Dove Series ([TCDS A-807](https://openairdocs.org/tcds/A-807))

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