What it approves
Replacement of de Havilland wing bleed air ducting with alternate ducting.
What the certificate says
From the PDF’s text layer, without the form’s printed wording. Layout and order may 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-
ADs that name this STC · 0
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Approved models · 4
Every issue · 4
DRS keeps each issue of an STC as its own record, with its own certificate and attachments.
| Date | Status | Files |
|---|---|---|
| April 15, 2026 | Amended, current | Certificate |
| April 3, 2024 | Amended, earlier issue | Certificate |
| July 25, 2023 | Reissued, earlier issue | Certificate |
| January 31, 2000 | Reissued, earlier issue | Certificate |