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Aircraft STC directory

Air Tractor AT-503A STCs

The Jun 30, 2026 FAA DRS snapshot contains 30 selected supplemental type certificates with status Current whose public applicability data names the Air Tractor AT-503A. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

30
listed Current at snapshot
17
holder directories
8
modification categories
Feb 27, 2026
latest recorded revision

Modification demand surface

Other aircraft modifications13
Avionics6
Engine and powerplant3
Aircraft structures2
Aircraft connectivity2
Fuel systems2
Landing gear and brakes1
Propellers1

Recorded holders

Electronics International Inc.3Turbine Conversions Ltd3Acron Aviation Inc.2ADS-B Technologies, LLC2Seaton Engineering Corp.2R-S Sales Inc.2Cascade Flying Service LLC1Latitude Technologies Corporation1Cascade Aircraft conversions LLC1Hershey Flying Service Inc1Avidyne Corporation1AMSAFE Inc.1Garmin International Inc1Aero Innovations LLC1P2 Incorporated1Precise Flight Inc1Pratt & Whitney Engine Services Inc.1

Recently revised AT-503A STCs

Showing the 30 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.

SA00888SEEngine and powerplant

Option 1: Install Walter M601-E11S engine and a Hartzell HC-B3TW-3/T10282N+4 propeller or a Walter M601-E11 engine and an Avia V508-E-AG 106/A propeller per the Master Drawing List and Installation Instructions given in Approved Model List SA00888SE. (Note: Prior to July 17, 2002, the model M601-E11S engine was designated as the model M601-E11 engine). Option 2: Install a Walter M601-D11 engine and Avia V508-E-AG 106/A propeller per Cascade Flying Service Master Drawing List CFS-MDL-0001 Rev G, dated June 15, 2004, and Cascade Flying Service Document CFS-IM-107, Rev A, dated July 29, 2003, “Installation Instructions for Walter Turbine Installation on Air Tractor 300 & 400 Series Ag Aircraft,” or later FAA-approved revisions to these documents. NOTE: The Air Tractor model AT-400, AT-402B, AT-502, AT-502B, and AT-503A airplanes are not eligible for modification under option 2.

FAA holder: Cascade Flying Service LLC

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SA09719ACOther aircraft modifications

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.

FAA holder: Spectrum Electrostatic Sprayers Inc.

View record