# STC SA3391SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Mitchell automatic flight system AK889 consisting of Century 31 autopilot.
- Status date: August 24, 1983
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A13](https://openairdocs.org/tcds/3A13)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0602B8FB323F6C8285256CC2000A9794.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3391SW-D

## ADs that name it (0)

None.

## Approved models (2)

- The Cessna Aircraft Company T182 ([TCDS 3A13](https://openairdocs.org/tcds/3A13))
- The Cessna Aircraft Company TR182 ([TCDS 3A13](https://openairdocs.org/tcds/3A13))

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