# STC SA00905SE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Cascade Flying Service LLC, United States
- Description: Install modified engine cowl.
- Applied: August 20, 2000
- Status date: March 23, 2018
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A9SW](https://openairdocs.org/tcds/A9SW), [TCDS A17SW](https://openairdocs.org/tcds/A17SW)
- Certificate PDF: https://openairdocs.org/files/sha256/d0/6e/d06e0ea3ceb677d7fb455a7e45f7adc0398f893e679e7dcbd89081811cf33fc1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7CE22EEB42705C1286258260004CB3C0.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA00905SE

## ADs that name it (0)

None.

## Approved models (8)

- Air Tractor Inc. AT-400 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW))
- Air Tractor Inc. AT-400A ([TCDS A9SW](https://openairdocs.org/tcds/A9SW))
- Air Tractor Inc. AT-402 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-402A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-402B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-502 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-502B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-503 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))

## 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.

Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate

Number SA00905SE

This certificate, issued to Cascade Aircraft Conversions, LLC 903 Grinnell Road Garfield, WA 99130

Part 21.25 of the Federal Aviation Regulations.

Original ProductType Certificate Number: A9SW A17SW Make: Air Tractor Air Tractor Model: AT-400, & -400A AT-402, -402A, -402B, -502, -502B & -503

Description of the Type Design Change: Install modified engine cowl per Cascade Flying Service Master Drawing List CFS-MDL-PT 0001, Revision A, dated April 10, 2001, and Cascade Flying Service Document CFS-IM-106, “Installation Instructions for Forced Air Induction Cowling, PT6A Powered Air Tractor” Revision IR, dated October 23, 2000, or later FAA approved revisions.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only.

This approval should not be extended to aircraft of these models on which other previously approv ed modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate must be maintained as part of the permanent records for the modified aircraft.

The modified aircraft must be maintained in accordance with the provisions of Cascade Flying Service Doc ument CFS-MM-109, “Maintenance Manual Supplement,” Revision IR, dated January 21, 2001, or later FAA approved revision.

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: August 20, 2000 Date reissued: July 12, 2013; March 23, 2018 Date of issuance: April 10, 2001 Date amended: October 15, 2004

(Signature)

Manager, Seattle ACO Branch (Title)

## Every issue (3)

- March 23, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d0/6e/d06e0ea3ceb677d7fb455a7e45f7adc0398f893e679e7dcbd89081811cf33fc1)
- July 12, 2013: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/74/4a/744a5742d22988f69b6706cb601f4861a12ee8ba2aa4a56a507e8f375b000fa6)
- October 15, 2004: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/b7/16/b716afdd646b44809b0736ad33f4d004a48e37c340a72ec99d252c6566d7e062)

---
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.