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Engine and powerplant

STC SA00888SE

FAA DRS lists SA00888SE as Current · Reissued, held by Cascade Flying Service LLC, for Air Tractor AT-401, Air Tractor AT-401A, and Air Tractor AT-401B, and 11 more aircraft configurations. Recorded change: 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. Snapshot dated June 30, 2026.

FAA-listed holder
Cascade Flying Service LLC
Aircraft configurations
14
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

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.

SA00888SE identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.

Applicability

Aircraft named in FAA DRS

Named aircraft: Air Tractor AT-401, Air Tractor AT-401A, and Air Tractor AT-401B, and 11 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Air Tractor AT-401A17SWAir Tractor AT-401AA17SWAir Tractor AT-401BA17SWAir Tractor AT-402A17SWAir Tractor AT-402AA17SWAir Tractor AT-402BA17SWAir Tractor AT-502A17SWAir Tractor AT-502BA17SWAir Tractor AT-503AA17SWAir Tractor AT-300A9SWAir Tractor AT-301A9SWAir Tractor AT-302A9SWAir Tractor AT-400A9SWAir Tractor AT-400AA9SW

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Air Tractor AT-401 and Air Tractor AT-401A, and 12 more aircraft configurations model, serial range, and configuration?
  2. 02Which powerplant configuration, limits, instruments, and maintenance data apply?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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