# STC SA4735NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: R-S Sales Inc., United States - Description: Installation of automatic flagman Model 4 dispensor system on the upper surface of the right wing root. - Applied: May 18, 1988 - Status date: August 27, 2001 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW) - Certificate PDF: https://openairdocs.org/files/sha256/03/52/03520e6a130f740899aaf870d5bab57a28ad90b98e6a4dde243f3b5be941d2b0 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/34FFF11B8CAAB3D7862579C2004E795B.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA4735NM ## ADs that name it (0) None. ## Approved models (7) - Air Tractor Inc. AT-401 ([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-501 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-502 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-503 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-503A ([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. Number SA4735NM This certificate, issued to R-S Sales, Inc. 170 O’Connor Road Lewiston, ID 83501 Part 21.25(a)(1) of the Federal Aviation Regulations, and FAR 36 effective 11/22/88. Original ProductType Certificate Number: A17SW Make: Air Tractor Model: AT-401, AT-501, AT-502, AT-402, AT-402A, AT-503, and AT-503A (Restricted Category) Description of the Type Design Change: Installation of Automatic Flagman Model No. 4, Dispensor System, On the upper surface of the right wing root in accordance with Automatic Flagman Installation Instructions No. 300-1000, revised May 23, 1989, and Parts Manufacturing Drawing No. 105, Sheets 1 through 8, revised May 23, 1989; 120, revised May 17, 1982; and 125, revised April 15, 1982, 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 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. A copy of this Certificate must 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: May 18, 1988 Date reissued: 08/27/01 Date of issuance: May 23, 1989 Date amended: 11/15/91; 08/27/01 (Signature) Acting Manager, Seattle Aircraft Certification Office (Title) ## Every issue (1) - August 27, 2001: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/03/52/03520e6a130f740899aaf870d5bab57a28ad90b98e6a4dde243f3b5be941d2b0) --- 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.