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Aircraft STC directory

Air Tractor AT-401B STCs

The cited FAA DRS record snapshots contain 46 selected supplemental type certificates with status Current whose public applicability data names the Air Tractor AT-401B. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

46
listed Current at snapshot
25
holder directories
7
modification categories
Jul 24, 2026
latest recorded revision

Recently revised AT-401B STCs

Showing the 46 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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