# STC SA7799SW-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC two axis automatic flight guidance system Model ST-423
- Applied: June 5, 1991
- Status date: July 10, 1991
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A12CE](https://openairdocs.org/tcds/A12CE)
- Certificate PDF: https://openairdocs.org/files/sha256/e2/33/e2332f8c0686231dd153c5196b5ea41235d0db40c32d72d152b7a125b7df5ab5
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CDFA6479942AC9D885256CC20056A49E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA7799SW-D

## ADs that name it (0)

None.

## Approved models (3)

- Raytheon Aircraft Company 60 ([TCDS A12CE](https://openairdocs.org/tcds/A12CE))
- Raytheon Aircraft Company A60 ([TCDS A12CE](https://openairdocs.org/tcds/A12CE))
- Raytheon Aircraft Company B60 ([TCDS A12CE](https://openairdocs.org/tcds/A12CE))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

Bepartmtnt of Transportation— federal Stoiation administration toppltmcntalCertificate SA7799SW-D S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, TX 76067 ry^*«e^ 23 Federal Aviation A12CE : BEECH : 60, A60, AND B60 Installation of S-TEC System 65 Two Axis Automatic Flight Guidance System, Model ST-423, according to Bulletin No. 523, dated 6-03-91 and Master Drawing List No. 92543, dated 6-03-91 and/or later FAA Approved revisions of the above data (28 Volt System).

FAA/DAS Approved Airplane Flight Manual Supplement, P/N 89930, dated 7-10-91 is required for Beech Models 60, A60, and B60 and/or later FAA Approved revisions of the above supplement.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

S!terninjA William iP: Thomas DAS Staff Coordinator, DAS 5 SW (Title) fine of not exceeding SI, OOP, or imprisonment not exceeding 3 years, or both.

This certi/ieate may kt traiuferrtJ in accordance uiitk FAR 21.47.

»AA POM «MO-J (IO-M)

Viimher and street) I Ci/r. Stole, and ^IP rode I Extent of Authority (if licensing agreement): __ Date of Transfer:.

Signature of grantor (In ink): __

## Every issue (1)

- July 10, 1991: Issued, Current. [certificate](https://openairdocs.org/files/sha256/e2/33/e2332f8c0686231dd153c5196b5ea41235d0db40c32d72d152b7a125b7df5ab5)

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