# STC SA7783SW-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC system 60 two axis automatic flight guidance system, model ST-347, with optional automatic electric trim system.
- Applied: November 8, 1990
- Status date: August 4, 1992
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21, Part 31
- Data sheets: [TCDS A9EA](https://openairdocs.org/tcds/A9EA)
- Certificate PDF: https://openairdocs.org/files/sha256/ab/fd/abfd01a5a22552f4acd10a673936069203b0a54b4d2476f9d5f90e668494c1c5
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6D2E798385D1E99B85256CC20056A48B.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA7783SW-D

## ADs that name it (0)

None.

## Approved models (2)

- Bombardier-Rotax GmbH DHC-6-100 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))
- Bombardier-Rotax GmbH DHC-6-200 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))

## 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.

lEUECI jKBED rf 2UKID Btpartrarnt of transportation—fetal aoiation administration Supplemental 'Cgpc Certificate iSUMTWei*' SA7783SW-D S-TEC Corporation 946 Pegram Wolters Industrial Park Mineral Wells, Texas 76067 ^^^ 3 y^ Civil Air A9EA

DE HAVILLAND DHC-6-100 and DHC-6-200 Installation of S-TEC System 60 Two Axis Automatic Flight Guidance System, Model ST-347, with Optional Automatic Electric Trim System according to Bulletin No. 447, Revision 4, dated 7-21-92 and Master Drawing List No. 92527, Revision D, dated 7-21-92 and/or later FAA Approved revisions of the above data (28 Volt Ssytem).

1. Only eligible on the above models when modified per DHC Mod. 6/1077 (Nose Extension)

2. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 89900, dated 12-12-90 is required for De Havilland Models DHC-6-100 and DHC-6-200 When Modified Per DHC Mod.

6/1077 (Nose Extension) and/or later FAA Approved revisions of the above supplement.

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

rrrtffttrrrifttitty4fn(tlr(i( rtnmrcdf rr a 11-08-90 W.***^:

12-12-90 3L*~n~J~t: 8-04-92, Revision 1 ~,I William J. Thomas DAS Staff Coordinator, DAS 5 SW (TilU) Any alteration oflhit certificate is punishable by a fine of not exceeding 11JXXI, or imprisonment not exceeding 3 years, or both.

TUt arttjltule may 4» traufem* m «nr*M* Ml* FAR 31.17.

f*A taw CUO-I (10-M)

fbntd £curs of Socrica Bqartmcnt of itransportation— jfdcral atrtanon administration Supplemental ICgpe Certificate(Continuation 5hett) SA7783SW-D, Revision 1 Limitations and Conditions (con't.)

3. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 89984S, dated 8-04-92 is required for De Havilland Twin Otter Models DHC-6-100 and DHC-6-200 When Modified Per DHC Mod. 6/1077 (Nose Extension) Landplane Configuration and/or later FAA Approved revisions of the above supplement.

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

.I'D alteration of this ctrtifitatt is fiuntihabU by a fat of not excttding SI ,000, or imprisonment not exceeding 3 ytars, or hnifi.

*AA FORM iiio-j-i (IIM*> Tint tirttfcott may i« tronj/trrrrf i« occonianci with FAR .7.^* PACK 2 OP 2 PACKS

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number .

to (Name of transferee) (Address of transferee) ( Number and street) (City, State, and <Y/> cade) from (Name of grantor) (Print or type) (Address of grantor) (.dumber attfi street) ( Cilr. Stnle. and ^IP code I Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- August 4, 1992: Amended, Current. [certificate](https://openairdocs.org/files/sha256/ab/fd/abfd01a5a22552f4acd10a673936069203b0a54b4d2476f9d5f90e668494c1c5)

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