# STC SA1259NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Air Transport Industries, United States
- Description: Installation of Air Transport Industries ATI75100-1 door.
- Applied: March 20, 1981
- Status date: July 14, 2006
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A9EA](https://openairdocs.org/tcds/A9EA)
- Certificate PDF: https://openairdocs.org/files/sha256/14/59/1459f547bb9e652e14d97b8273b3ea348a21c749873c090c63679be1738973b6
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C8C4BE9A386FDA7B862571B200515583.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1259NW

## ADs that name it (0)

None.

## Approved models (3)

- Bombardier Inc. DHC-6-100 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))
- Bombardier Inc. DHC-6-200 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))
- Bombardier Inc. DHC-6-300 ([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.

United States of America Department of Transportation_Federal Aviation Administration Supplemental Type Certificate (This STC is a duplicate original to replace the original which was lost. Issued 7/14/06) Number SA1259NW This certificate, issued to: Air Transport Industries 328 Priest Point Drive NW Mar ysville, WA 98270

Part 3 of the Civil Air Regulations.

Original Product⎯Type Certificate Number: A9EA Make: DeHavilland Model: DHC-6-100, -200 and -300

Description of the Type Design Change: Installation of Air Transport Industries ATI75100-1 door as a replacement for the original door in accordance with FAA sealed Air Transport Industries Installation Drawing List No. 2 dated June 8, 1981.

Limitations and Conditions: Approval of this change in type design applies basically to the above model aircraft only. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any other type design changes or previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate shall be maintained as part of the permanent records for the modified aircraft.

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Date of application: March 20, 1981 Date reissued: July 14, 2006 Date of issuance: June 24, 1981 Date amended: July 14, 2006

(Signature) Acting Manager, Seattle Aircraft Certification Office (Title)

**FAA FORM 8110-2(10-68**

## Every issue (1)

- July 14, 2006: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/14/59/1459f547bb9e652e14d97b8273b3ea348a21c749873c090c63679be1738973b6)

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