# STC SA8385SW-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 65 two axis automatic flight guidance system, Model ST-528.
- Applied: April 12, 1994
- Status date: August 8, 1996
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/37/77/3777ff1dec8d254cb16e29c8a3f2852af9df8a823c28ddfa90ce7d087c616ba2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A652E0CA7D3335985256CC20058E76E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA8385SW-D

## ADs that name it (0)

None.

## Approved models (1)

- Twin Commander Aircraft Corporation 680-E ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## 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.

rf 30X3 Bcpartmrnt of transportation— jfotoal atriation administration Supplemental ¥gpc Certificate ^frf<//r SA8385SW-D S-TEC Corporation 946 Pegram Mineral Wells, TX 76067 3 jVLe C 1 V 1 1 Air 2A4 Twin Commander 680 -E Installation of S-TEC System 65 Two Axis Automatic Flight Guidance System, Model ST-528, according to Bulletin No. 628, Revision 1, dated 6-06-96 and Master Drawing List No. 92641, Revision A, dated 6-06-96 with Optional Flight Director/Steering Horizon or later FAA Approved revisions of the above data (28 Volt System).

1. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 891056, dated 4-29-94 is required or later FAA Approved revisions of the above supplement.

(See Continuation Sheet, Page 2, a part of this STC.)

4-12-94 4-29-94 ^ S£c/mi7i* : 8-08-96, Revision 1 William 3. Thomas DAS Staff Coordinator. DAS 5 SW (T,tle) Any alteration of this certifieate it punishable by a.fine of not exceeding SI ,000, or imprisonment not exceeding 3 years, or both.

nit certifieale may te trarufrrrtJ in atn'-ana iviM FAR 21.47.

»AA taw «1 tO-1 (IO-4I)

United 3tarn of Snain Bepartmaic of Transportation—jfcdcral aoiation administration Supplemental tjpe Certificate(Continnation .Sheet) i/VMmveW SA8385SW-D, Revision 1 Limitations and Conditions (con't.)

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891056-1, dated 8-08-96 is required for Twin Commander Model 680-E or later FAA Approved revisions of the above supplement.

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

.I'n allertitiun of this certificate is punishable by a fint of not exceeding tl,000, or imprisonment not exceeding 3 fears, at hnih.

M inu.2-1 (10-«> Tint etrtifcaU may A« tranifir'td m accordant! with FAR .'I.-I' PACE 2 OF 2 PAGES

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ^IP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

U.S. GOVERNMENT PRINTING OFFICE : 1966 OF—205-579

## Every issue (1)

- August 8, 1996: Amended, Current. [certificate](https://openairdocs.org/files/sha256/37/77/3777ff1dec8d254cb16e29c8a3f2852af9df8a823c28ddfa90ce7d087c616ba2)

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