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Aircraft STC directory

Air Tractor AT-400A STCs

The Jun 30, 2026 FAA DRS snapshot contains 42 selected supplemental type certificates with status Current whose public applicability data names the Air Tractor AT-400A. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

42
listed Current at snapshot
22
holder directories
7
modification categories
Feb 27, 2026
latest recorded revision

Modification demand surface

Other aircraft modifications28Engine and powerplant5Fuel systems3Aircraft structures2Aircraft connectivity2Avionics1Landing gear and brakes1

Recorded holders

Reabe Design LLC4Turbine Conversions Ltd4Electronics International Inc.3Avidyne Corporation2Cascade Flying Service LLC2Seaton Engineering Corp.2R-S Sales Inc.2Kawak Aviation Technologies Inc1Lanitz-Prena Folien Factory GmbH1Airwolf Filter Corporation1Latitude Technologies Corporation1Cascade Aircraft conversions LLC1Hershey Flying Service Inc1AMSAFE Inc.1Aviation Products Systems Inc.1Aero Spraying Service Inc.1Micro AeroDynamics Inc1Collins Aircraft Dynamics Inc1P2 Incorporated1Pratt & Whitney Engine Services Inc.1

Recently revised AT-400A STCs

Showing the 42 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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