# STC SA1-255

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Navigation Devices, Inc, United States
- Description: Dart I-M turn control unit.
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1A6](https://openairdocs.org/tcds/1A6)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/91B7129EC2C6A53E85256CC1007F3BD4.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1-255

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-22 Series ([TCDS 1A6](https://openairdocs.org/tcds/1A6))

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