# STC SA00198SE

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Aeronautical Testing Service Inc., United States
- Description: Fabrication and installation of vortex generators and 'delta wings' mounted on the wings and strakes mounted above the left- and right-hand wing/ fuselage junctions.
- Applied: January 9, 1995
- Status date: May 22, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW)
- Certificate PDF: https://openairdocs.org/files/sha256/02/a7/02a764f82420a2f857bfbaf652b1257414c5af02e89c03e4c2d094c107086e8c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AD0E6994EEA1866C862579AB00687673.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA00198SE

## ADs that name it (0)

None.

## Approved models (6)

- Air Tractor Inc. AT-401 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-401A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-401B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- 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))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Baok Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA00198SE This certificate issued to: Aeronautical Testing Service, Inc.

Part 21.25(a)(1) of the Federal Aviation Regulations and Part 8 of the Civil Air Regulations. See Type Certificate Data Sheet No. A17SW for other certification basis.

Original Product -Type Certificate Number: A17SW Make: Air Tractor Model: AT-401, AT-401A, AT-401B, AT-402, AT-402A, AT-402B Description of the . ye Design Change: Fabrication and Installation of vortex generators and "delta wings" mounted on the wings, and strakes mounted above the left- and right- hand wing/fuselage junctions in accordance with an FAA approved copy of Aeronautical Testing Service, Inc., Drawing List No. ATS-301, Revision "F", dated May 9, 1997, or later FAA approved revision.

Option 1: No change in airspeeds; Airplane Flight Manual Supplement (AFMS) not required.

Option 2: Reduce stall speeds; AFMS required.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated unless it is determined by the installer 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. Aircraft modified per option 2 of this STC must be operated in accordance with Revisions "A" to Aeronautical Testing Service, Inc., (ATS) AFMS Report No. ATS 95-03a (AT-401, AT-401A and AT-401B) and ATS 95-03b (AT-402, AT-402A and AT-402B), each revised May 22, 1997, or later FAA approved revisions. A copy of this Certificate, and the appropriate FAA approved AFMS (option 2, only),must be maintained as part of the permanent records for the modified aircraft. (See Continuation Sheet page 3 of 3).

Date of Application: January 9, 1995 Date Reissued:

Date of Issuance: June 14, 1995 Date Amended: May 22, 1997

FEDERAL AVIATION м - NOMINIST RATION Acting Manager, Seatle Aircraft (Signature) Certification Office (Title)

47.

## Every issue (1)

- May 22, 1997: Amended, Current. [certificate](https://openairdocs.org/files/sha256/02/a7/02a764f82420a2f857bfbaf652b1257414c5af02e89c03e4c2d094c107086e8c)

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