# STC SA09719AC - Type: Supplemental type certificate - Status: Current, Issued - Holder: Zee Systems Inc., United States - Description: Installation electrostatic spray equipment and controls - Applied: October 3, 2008 - Status date: June 18, 2026 - Product: Aircraft, Small Airplane - Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW) - Certificate PDF: https://openairdocs.org/files/sha256/87/27/8727ba56b97efffd1ae639b49071f17bd1f62510181335851f7e6136b842c7b1 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID195573364020260805151344.0001 - DRS record last changed: August 5, 2026 - Page: https://openairdocs.org/stc/SA09719AC ## ADs that name it (0) None. ## Approved models (12) - 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)) - 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-502A ([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)) - 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. SA09719AC Zee Systems Inc. 127 Braniff San Antonio, TX 78216 Part 8 the Civil Air Regulations* A17SW Air Tractor, Inc. See Continuation Sheet 3 of 3 The installer must determine whether this design change is compatible with previously approved modifications. (See Continuation Sheet 3 of 3) 10/03/2008 06/18/2026 01/07/2011 for Jason S. Deutschman Acting Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3 Installation electrostatic spray equipment and controls in accordance with ZEE Systems, Inc. Document Number Z03-1 MDL-MDI, Revision D, dated 10-22-10; Airplane Flight Manual Supplement Document Number Z03-AFMS, Rev IR dated 12/27/2010; Instructions for Continued Airworthiness (ICA), Z03K000, Rev IR, dated 11-15-10, or later FAA approved revision are a required part of this modification. SA09719AC 06/18/2026 3 SA09719AC 06/18/2026 *Part 23 of the Title 14, Code of Federal Aviation Regulations and Reference Part 21.25(a)(1) Model: AT-401, AT-401A, AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-502, AT-502A, AT-502B, AT-503, and AT-503A This is a non-interference STC as defined in FAA Order 8110.4; as such, this modification has not been evaluated by the FAA to check it's proper operation for its intended function since no FAA standards are available to evaluate this system. 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. -END- 3 3 ## Every issue (2) - June 18, 2026: Issued, Current. [certificate](https://openairdocs.org/files/sha256/87/27/8727ba56b97efffd1ae639b49071f17bd1f62510181335851f7e6136b842c7b1) - January 7, 2011: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/04/89/0489b6a3faf6f8526d26c22a3532cfcff7d35fc8ccf6479d28a83d8892ff7dd8) --- 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.