# STC SA943EA

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Texas Air Services Inc., United States
- Description: Replacement of de Havilland wing bleed air ducting with alternate ducting.
- Applied: September 26, 1972
- Status date: April 15, 2026
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS A9EA](https://openairdocs.org/tcds/A9EA)
- Certificate PDF: https://openairdocs.org/files/sha256/16/14/16146999e6de36229a2152d43ad632fd69f322037e6e1f1b9aa4dc06fd6d8d24
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID141512651620260416145650.0001
- DRS record last changed: April 16, 2026
- Page: https://openairdocs.org/stc/SA943EA

## ADs that name it (0)

None.

## Approved models (4)

- Viking Air Limited DHC-6-100 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))
- Viking Air Limited DHC-6-200 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))
- Viking Air Limited DHC-6-300 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))
- Viking Air Limited DHC-6-400 ([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.

FAA 8110-2 (10/24) Page 1 of 3 United States of America Department of Transportation Federal AviationAdministration Supplemental Type Certificate

Number: SA943EA This certificate issued to: Texas Air Services, Inc.

2602 45th Street Dickinson, TX 77539 Part 3 of the Civil Air Regulations .

Original Product Type Certificate Number: A9EA Make: de Havilland Inc.

Description of Type Design Change: Model: DHC-6 Models 100, 200, 300, 400 Replacement of de Havilland wing bleed air ducting with alternate ducting in accordance with DeVore Installation Drawing DAS 1000 Rev. E dated 6/24/76 and Installation Instructions DAS-II-1000 Rev. A. dated 6/9/76.

The 1976 amendment approved Alternate Bellows Type Duct Assembly P/N DAS 1001-3.

The 2024 amendment approved DHC-6 Model 400.

The current amendment approves Master Drawing List TAS MDL1000 Rev. D dated 4/10/2026 and Installation Instructions TAS-II-1000 Rev. B dated 4/10/2026.

This installation complies with SFAR 23 paragraph 49a and FAR 135 Appendix A paragraph 49a. The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

Date of Application: 09/26/1972 Date Reissued: 02/29/1980 01/31/2000 07/25/2023 Date of Issuance: 01/15/1973 Date Amended: 03/12/1973 07/08/1976 04/03/2024 ✔ see continuation sheet for additional dates By Direction of the Administrator

for Roy E. Boffo III Deputy Branch Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service

FAA 8110-2 (10/24) Page 2 of 3 United States of America Department of Transportation Federal AviationAdministration Supplemental Type Certificate

Number: SA943EA Effective Date: 04/15/2026

United States of America Department of Transportation Federal AviationAdministration Supplemental Type Certificate

(Continuation Sheet) Number: SA943EA

04/15/2026 04/15/2026

-END-

## Every issue (4)

- April 15, 2026: Amended, Current. [certificate](https://openairdocs.org/files/sha256/16/14/16146999e6de36229a2152d43ad632fd69f322037e6e1f1b9aa4dc06fd6d8d24)
- April 3, 2024: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/b2/98/b29894e25c172ac2074d089ceb0144bd355a2ed7b0a541cee4dcdcabef168782)
- July 25, 2023: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/ac/60/ac603d125b2e27849923de5f14d5c686c9ce63740f8e9cfb8d1d4300a67eb26d)
- January 31, 2000: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c5/97/c59764c3e12e8fdad0e7c92f6669f957fb23d52a2969f1e06f24e61ca7cff007)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.