Aircraft & Parts For Sale FOR SALE !!! Pressure Cowl for 402 or 602 ready for immediate sale!! FOR SALE !!! Pratt-Whitney R-1340-AN-1 for AT-401 Air Tractor with Firewall Foreward. SMOH 1080. Prop 12D40-6101A-12. Make Offer Comming Soon! COMMING FALL 2007 !!! 1999 Air Tractor 502B with Cascade Walter Conversion COMMING FALL 2007 !!! 1993 Air Tractor 401 with Cascade Walter Conversion