# STC SA285SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Riley Aircraft Corp, United States
- Description: Installation of Lycoming IO-540- A1A5 powerplants and Hartzell HCA3XK-2B/7636D propellers.
- Status date: November 29, 1984
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A25](https://openairdocs.org/tcds/3A25)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1153313B436AB4E685256CC20008CA26.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA285SO

## ADs that name it (1)

- [AD 65-02-03](https://openairdocs.org/ad/65-02-03): Turbochargers · Rajay Turbochargers with STC SA529WE or 6 others. Named in the applicability

## Approved models (2)

- The Cessna Aircraft Company 320 ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- The Cessna Aircraft Company 320-1 ([TCDS 3A25](https://openairdocs.org/tcds/3A25))

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