# STC SA09531AC-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 20/30 single and two-axis automatic flight guidance systems, model ST-906-20/30
- Applied: October 16, 2002
- Status date: November 22, 2002
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-2-575](https://openairdocs.org/tcds/A-2-575)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2DD8B88DABEDAA2B86256D180063DC41.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09531AC-D

## ADs that name it (0)

None.

## Approved models (7)

- The Boeing Company AT-6A (SNJ-3) ([TCDS A-2-575](https://openairdocs.org/tcds/A-2-575))
- The Boeing Company AT-6B ([TCDS A-2-575](https://openairdocs.org/tcds/A-2-575))
- The Boeing Company AT-6C (SNJ-4) ([TCDS A-2-575](https://openairdocs.org/tcds/A-2-575))
- The Boeing Company AT-6D (SNJ-5) ([TCDS A-2-575](https://openairdocs.org/tcds/A-2-575))
- The Boeing Company AT-6F (SNJ-6) ([TCDS A-2-575](https://openairdocs.org/tcds/A-2-575))
- The Boeing Company SNJ-7 ([TCDS A-2-575](https://openairdocs.org/tcds/A-2-575))
- The Boeing Company T-6G ([TCDS A-2-575](https://openairdocs.org/tcds/A-2-575))

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