# STC SA00888SE - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Cascade Flying Service LLC, United States - Description: 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. - Applied: October 24, 1997 - Status date: March 3, 2021 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW), [TCDS A9SW](https://openairdocs.org/tcds/A9SW) - Certificate PDF: https://openairdocs.org/files/sha256/8d/3a/8d3a4cbefcc7800e7bfe6081e7d893c8a63a013aee43d4d5909245d04c177c0a - Approved model list and other attachments: [AML_SA00888SE.pdf](https://openairdocs.org/files/sha256/30/03/30036f0376e16ce44af311e4c3f5aa5a8093e8581db97a0300925639fb2722e3) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E8BD42CB5715EAA7862586B20062D295.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA00888SE ## ADs that name it (0) None. ## Approved models (14) - Air Tractor Inc. AT-300 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW)) - Air Tractor Inc. AT-301 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW)) - Air Tractor Inc. AT-302 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW)) - Air Tractor Inc. AT-400 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW)) - Air Tractor Inc. AT-400A ([TCDS A9SW](https://openairdocs.org/tcds/A9SW)) - Air Tractor Inc. AT-401 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-401A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-401B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-402 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-402A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-402B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-502 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-502B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) - Air Tractor Inc. AT-503A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate Number SA00888SE This certificate, issued to Cascade Aircraft Conversions, LLC 903 Grinnell Road Garfield, WA 99130 Part 21.25 of the Federal Aviation Regulations. Original ProductType Certificate Number: See AML SA00888SE Make: Air Tractor Model: See AML SA00888SE Description of the Type Design 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. Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. Date of application: October 24, 1997 Date reissued: 12/30/03; 3/23/18 Date of issuance: March 12, 2001 Date amended: 12/30/03; 6/18/04; 10/15/04; 4/25/08 (Signature) Manager, Seattle ACO Branch (Title) Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SA00888SE Cascade Aircraft Conversions, LLC Issued: March 12, 2001 Reissued: 12/30/03; 3/23/18 Amended: 12/30/03; 6/18/04; 10/15/04; 4/25/08 Description of the Type Design Change continued: **1. ENGINES** a) NUMBER OF ENGINES 1 b) ENGINE MANUFACTURER WALTER c) ENGINE MODEL NUMBER M601-E11/E11S d) OPERATING LIMITS e) POWERPLANT INSTRUMENT MARKINGS: INSTRUMENT Redline Minimum Green Arc Normal Yellow Arc Caution Redline Maximum Torque N/A 0-100 100-106 106 Tach RPM Ng 60 60-97 97-100 100 Tach RPM Np N/A 800-2080 N/A 2080 Temp ITT (°C) N/A 430-690 690-735 735 Oil Press (MPa) .12 .18-.25 .12-.18 & .25-.35 .35 Oil Temp (°C) N/A 20-95 -20-+20 95 Fuel Press Eng (kPa) N/A 0-120 N/A 120 Fuel Press Filter (psig) 2 N/A N/A N/A FAA FORM 8110-2- 1 (10-69) PAGE 3 OF 5 PAGES Power Setting SHP Torque ft-lb Max. ITT°C Gas Speed Ng RPM Prop Speed Np RPM Oil Pressure psig (MPa) Oil Temp °F (°C) Take-off 751 1895 100% 735 36660 100% 2080 26.1–39.1 (.18 to .27) +20–+85 (-6 to +29) Max Cont. 657 1895 100% 690 35560 97% 1900 26.1-39.1 (.18 to .27) +20-+85 (-6 to +29) Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SA00888SE Cascade Aircraft Conversions, LLC Issued: March 12, 2001 Reissued: 12/30/03; 3/23/18 Amended: 12/30/03; 6/18/04; 10/15/04; 4/25/08 Description of the Type Design Change continued: Engines (Continued) f) NUMBER OF ENGINES 1 g) ENGINE MANUFACTURER WALTER h) ENGINE MODEL NUMBER M601-D11 i) OPERATING LIMITS j) POWERPLANT INSTRUMENT MARKINGS: INSTRUMENT Redline Minimum Green Arc Normal Yellow Arc Caution Redline Maximum Torque N/A 0-86 86 - 92 92 Tach RPM Ng 60 60 - 98.5 98.5 - 100 100 Tach RPM Np N/A 800-1950 N/A 1950 Temp ITT (°C) N/A 430-690 690-735 735 Oil Press (MPa) .12 .18-.25 .12 - .18 & .25 - .35 .35 Oil Temp (°C) N/A 20-95 -20 - +20 95 Fuel Press Eng (kPa) N/A 0-120 N/A 120 Fuel Press Filter (psig) 2 N/A N/A N/A 2. PROPELLERS: (a) Number of propellers 1 (b) Propeller Manufacturer Hartzell (M60-E11S engine only) FAA FORM 8110-2- 1 (10-69) PAGE 4 OF 5 PAGES Power Setting SHP Torque ft-lb Max. ITT°C Gas Speed Ng RPM Prop Speed Np RPM Oil Pressure psig (MPa) Oil Temp °F (°C) Take-off 5 min 604 1630 86% 735 36660 100% 1950 26.1 to 39.1 (.18 to .27) +20 to +85 (-6 to +29) Max Cont. 604 1630 86% 690 36110 98.5% 1950 26.1 to 39.1 (.18 to .27) +20 to +85 (-6 to +29) Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SA00888SE Cascade Aircraft Conversions, LLC Issued: March 12, 2001 Reissued: 12/30/03; 3/23/18 Amended: 12/30/03; 6/18/04; 10/15/04; 4/25/08 Description of the Type Design Change continued: Propellers (Continued) (c) Blade Model T10282N+4 (d) Number of Blades 3 (e) Hub Model HC-B3TW-3 (f) Propeller Type Hydraulically Operated, Constant Speed, Full Feathering, Reversible (g) Diameter Maximum 106 inches Minimum 102 inches (a) Number of propellers 1 (b) Propeller Manufacturer Avia Propellers (c) Blade Model 106/A (d) Number of Blades 3 (e) Hub Model V508E-AG (f)Propeller Type Hydraulically Operated, Constant Speed Full Feathering, Reversable. (g) Diameter Maximum 106 inches, no cutoff allowed -END- **FAA FORM 8110-2- 1 (10-69) PAGE 5 OF 5 PAGES** ### AML_SA00888SE.pdf **FAA APPROVED MODEL LIST (AML) SA00088SE FOR** INSTALLATION OF WALTER ENGINE CONVERSION ISSUE DATE: April 28, 2008 Page 1 of 1 **ITEM AIRCRAFT AIRCRAFT MODEL** **ORIGINAL TC NUMBER** **CERTIFICATION** **BASIS FOR** **ALTERATION** **FAA APPROVED AIRCRAFT** **FLIGHT MANUAL SUPPLEMENT** **FAA APPROVED MASTER** **DRAWING LIST** **INSTRUCTIONS FOR** **CONTINUED** **AIRWORTHINESS** **INSTALLATION** INSTRUCTIONS AML REV DATE Number Revision* Drawing Revision* Number Revision* Number Revision* 1. Air Tractor AT-300, -301, -302, -400A A9SW FAR 21.25 CFS-FMS-201 Rev C, dated 7/8/09 for Option 1 **CFS-MDL- 0001** Rev R dated 6/8/09 CFS-MM- 108 Rev. D Dated 6/2009 CFS-IM-107 Rev A Dated 7/29/03 3/3/2021 CAC-059-11-D Rev IR, dated 6/18/04 for Option 2 2. Air Tractor AT-401, -401A, -401B A17SW FAR 21.25 CFS-FMS-201- 401 Rev B, dated 07/08/09 for Option 1 CFS-MDL- 0001 Rev R, dated 6/8/09 CFS-MM- 108 Rev. D dated 6/2009 CFS-IM-107 Rev. A dated 7/29/03 3/3/2021 CAC-059-11-401- D Rev A dated 07/09/09 for Option 2 3. Air Tractor AT-402, -402A A17SW FAR 21.25 CFS-FMS-201 Rev C, dated 7/8/09 for Option 1 CFS-MDL- 0001 Rev R, dated 6/8/09 CFS-MM- 108 Rev D dated 6/2009 CFS-IM-107 Rev A, dated 7/29/03 3/3/2021 CAC-059-11-D Rev IR, dated 6/18/04 for Option 2 4. Air Tractor AT-400 A9SW FAR 21.25 CFS-FMS-201 Rev C, dated 7/8/09 CFS-MDL- 0001 Rev R, dated 6/8/09 CFS-MM- 108 Rev D, dated 6/2009 CFS-IM-107 Rev A, dated 7/29/03 3/3/2021 5. Air Tractor AT-402B A17SW FAR 21.25 CFS-FMS-201 Rev C, dated 7/8/09 CFS-MDL- 0001 Rev R, dated 6/8/09 CFS-MM- 108 Rev D, dated 6/2009 CFS-IM-107 Rev A, dated 7/29/03 3/3/2021 6. Air Tractor AT-502, -502B,- 503A A17SW FAR 21.25 CFS-FMS-201 Rev C, dated 7/8/09 FW-CFS458- 90 Rev E, dated 6/8/09 CFS-MM- 108 Rev D, dated 6/2009 CFS-IM-107 Rev A, dated 7/29/03 3/3/2021 * Or later FAA Approved/Accepted Revision FAA Approved: For Acting Manager, Seattle ACO Branch AMENDED: July 9, 2009 REISSUED: March 23, 2018; March 3, 2021 ## Every issue (6) - March 3, 2021: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8d/3a/8d3a4cbefcc7800e7bfe6081e7d893c8a63a013aee43d4d5909245d04c177c0a), [AML_SA00888SE.pdf](https://openairdocs.org/files/sha256/30/03/30036f0376e16ce44af311e4c3f5aa5a8093e8581db97a0300925639fb2722e3) - March 23, 2018: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/8d/3a/8d3a4cbefcc7800e7bfe6081e7d893c8a63a013aee43d4d5909245d04c177c0a), [AML_SA00888SE.pdf](https://openairdocs.org/files/sha256/30/03/30036f0376e16ce44af311e4c3f5aa5a8093e8581db97a0300925639fb2722e3) - July 9, 2009: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/50/1f/501f1dd66e1d26d2fde6c4e2343faf65bc4507277fc2bbcee27ee7aece2beb24), [AML SA00888SE.pdf](https://openairdocs.org/files/sha256/e9/58/e9587f3b3a719fdea40c28cab8b4e1d0dce6c12f95e2bf9484e56ef21798ac9a) - April 25, 2008: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/50/1f/501f1dd66e1d26d2fde6c4e2343faf65bc4507277fc2bbcee27ee7aece2beb24) - October 15, 2004: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/c6/ba/c6ba86899d68aa2eb550da5b98bc07da12603137fcb1347d3c38c94a53bdd32e) - June 18, 2004: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/1c/b7/1cb7a4b495848394e2b192bff8fde7e08fb19bb21f41b0794dab3babe668cd9f) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.