# STC SA02553AK - Type: Supplemental type certificate - Status: Current, Issued - Holder: Keller Engineering Group LLC, United States - Description: Fabrication and installation of a Tail Wheel Anti-Shimmy Dampener - Applied: March 27, 2020 - Status date: September 16, 2021 - Product: Aircraft, Small Airplane - Certification basis: Part 21, Part 23 - Data sheets: [TCDS A-802](https://openairdocs.org/tcds/A-802), [TCDS A-759](https://openairdocs.org/tcds/A-759), [TCDS A-761](https://openairdocs.org/tcds/A-761), [TCDS A-796](https://openairdocs.org/tcds/A-796), [TCDS A21CE](https://openairdocs.org/tcds/A21CE), [TCDS A22NM](https://openairdocs.org/tcds/A22NM), [TCDS A8SO](https://openairdocs.org/tcds/A8SO), [TCDS A00053SE](https://openairdocs.org/tcds/A00053SE), [TCDS A00057SE](https://openairdocs.org/tcds/A00057SE), TCDS 760, [TCDS A-725](https://openairdocs.org/tcds/A-725), [TCDS A-797](https://openairdocs.org/tcds/A-797), [TCDS A-780](https://openairdocs.org/tcds/A-780), [TCDS A-694](https://openairdocs.org/tcds/A-694), [TCDS 3A23](https://openairdocs.org/tcds/3A23), [TCDS A7EA](https://openairdocs.org/tcds/A7EA), [TCDS 1A1](https://openairdocs.org/tcds/1A1), [TCDS 1A2](https://openairdocs.org/tcds/1A2), [TCDS 1A6](https://openairdocs.org/tcds/1A6), [TCDS A-691](https://openairdocs.org/tcds/A-691) and 22 more - Certificate PDF: https://openairdocs.org/files/sha256/3f/10/3f1077e47e35d257e3d830e48b57c85d1ea9a79349a4078704ff012926cd9d23 - Approved model list and other attachments: [AML_SA02553AK.pdf](https://openairdocs.org/files/sha256/04/89/04891d9daa5a8ea600090ddfcaeea6ecf4d0995c8330f06065e4701970d921c5) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5EA44F50506F3E02862587760058BB9D.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA02553AK ## ADs that name it (0) None. ## Approved models (311, first 50) - AeroSedan LLC 15AC ([TCDS A-802](https://openairdocs.org/tcds/A-802)) - AeroSedan LLC S15AC ([TCDS A-802](https://openairdocs.org/tcds/A-802)) - American Champion Aircraft Corp. 11AC ([TCDS A-761](https://openairdocs.org/tcds/A-761)) - American Champion Aircraft Corp. 11BC ([TCDS A-761](https://openairdocs.org/tcds/A-761)) - American Champion Aircraft Corp. 11CC ([TCDS A-796](https://openairdocs.org/tcds/A-796)) - American Champion Aircraft Corp. 7AC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7ACA ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7BCM (Army L-16A) ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7CCM (Army L-16B) ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7DC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7EC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7ECA ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7FC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7GC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7GCA ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7GCAA ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7GCB ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7GCBA ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7GCBC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7HC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7JC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7KC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 7KCAB ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. 8GCBC ([TCDS A21CE](https://openairdocs.org/tcds/A21CE)) - American Champion Aircraft Corp. 8KCAB ([TCDS A21CE](https://openairdocs.org/tcds/A21CE)) - American Champion Aircraft Corp. S11AC ([TCDS A-761](https://openairdocs.org/tcds/A-761)) - American Champion Aircraft Corp. S11BC ([TCDS A-761](https://openairdocs.org/tcds/A-761)) - American Champion Aircraft Corp. S11CC ([TCDS A-796](https://openairdocs.org/tcds/A-796)) - American Champion Aircraft Corp. S7AC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. S7CCM ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. S7DC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - American Champion Aircraft Corp. S7EC ([TCDS A-759](https://openairdocs.org/tcds/A-759)) - Aviat Aircraft Inc A-1 ([TCDS A22NM](https://openairdocs.org/tcds/A22NM)) - Aviat Aircraft Inc A-1A ([TCDS A22NM](https://openairdocs.org/tcds/A22NM)) - Aviat Aircraft Inc A-1B ([TCDS A22NM](https://openairdocs.org/tcds/A22NM)) - Aviat Aircraft Inc A-1C-180 ([TCDS A22NM](https://openairdocs.org/tcds/A22NM)) - Aviat Aircraft Inc A-1C-200 ([TCDS A22NM](https://openairdocs.org/tcds/A22NM)) - Aviat Aircraft Inc S-1S ([TCDS A8SO](https://openairdocs.org/tcds/A8SO)) - Aviat Aircraft Inc S-1T ([TCDS A8SO](https://openairdocs.org/tcds/A8SO)) - Aviat Aircraft Inc S-2 ([TCDS A8SO](https://openairdocs.org/tcds/A8SO)) - Aviat Aircraft Inc S-2A ([TCDS A8SO](https://openairdocs.org/tcds/A8SO)) - Aviat Aircraft Inc S-2B ([TCDS A8SO](https://openairdocs.org/tcds/A8SO)) - Aviat Aircraft Inc S-2C ([TCDS A8SO](https://openairdocs.org/tcds/A8SO)) - Aviat Aircraft Inc S-2S ([TCDS A8SO](https://openairdocs.org/tcds/A8SO)) - Cub Crafters Inc. CC19-180 ([TCDS A00053SE](https://openairdocs.org/tcds/A00053SE)) - Cub Crafters Inc. CC19-215 ([TCDS A00053SE](https://openairdocs.org/tcds/A00053SE)) - Cub Crafters Inc. CC21-180 ([TCDS A00057SE](https://openairdocs.org/tcds/A00057SE)) - FS 2000 Corp. TC L-14 (TCDS 760) - FS 2001 Corp. AE-1 ([TCDS A-725](https://openairdocs.org/tcds/A-725)) - FS 2001 Corp. HE-1 ([TCDS A-725](https://openairdocs.org/tcds/A-725)) All 311: https://openairdocs.org/stc/SA02553AK/models.md ## 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. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA02553AK This certificate issued to: Keller Engineering Group, LLC. 18714 Mink Creek Chugiak, AK 99567 Part 23 of Federal Aviation Regulations. Original Product Make: Refer to FAA Approved Model List (AML) Number SA02553AK, dated Type Certificate Number: Model: August 30, 2021, or later FAA approved revision, for airplane makes and models, corresponding Type Certificate numbers, and applicable airworthiness regulations. Fabrication and installation of a Tail Wheel Anti-Shimmy Dampener in accordance with Keller Engineering Installation Instructions Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated January 23, 2021 or later FAA approved revisions. 1) The installer must determine whether the design change is compatible with previously approved modifications. (Continued on Page 3 of 3) Date of application: March 27, 2020 Date reissued: Date of issuance: September 16, 2021 Date amended: August A. Asay Title: Manager, Anchorage ACO Branch 14 CFR 21.120) FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 1 OF 3 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA02553AK Transfer Endorsement Transfer the ownership of Supplemental Type Certificate Number: SA02553AK To (Name and address of transferee): 14 CFR 21.120) FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 2 OF 3 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Date of application: March 27, 2020 Date of issuance: September 16, 2021 Date reissued: Number: SA02553AK (Continuance from Page 1 of 3) 2) The aircraft must previously or concurrently be converted to Scott or ABI 3200 or 3400, excluding 3245, series tail wheel installation. 3) Maintain the Tail Wheel Shimmy Dampener Installation in accordance with Keller Engineering Installation Instructions revision IR, dated January 23, 2021; and Instructions for Continued Airworthiness, revision IR, dated February 2, 2021 or later FAA approved revisions. --------------------- End --------------------- 14 CFR 21.120) FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 3 OF 3 ### AML_SA02553AK.pdf United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener TCDS HOLDER **MODEL TCDS NUMBER** **CERTIFICATION BASIS** **INSTALLATION** INSTRUCTIONS ICA American 7AC, 7ACA, S7AC, (L-16A) 7BCM, A-759 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Champion (L-16B) 7CCM, S7CCM, 7DC, amendment 23-55 on Tailwheel Shimmy Dampener Continued (Bellanca) S7DC, 7EC, S7EC, 7ECA, 7FC, 7GC, for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (Champion) 7GCA, 7GCAA, 7GCB, 7GCBA, Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or Tailwheel Shimmy Dampener for Scott & (Aeronca) 7GCBC, 7HC, 7JC, 7KC, 7KCAB later FAA approved revision ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision American 8KCAB, 8GCBC A21CE 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Champion amendment 23-55 on Tailwheel Shimmy Dampener Continued (Bellanca) for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (Champion) Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 1 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener American 11AC, S11AC, 11BC, S11BC A-761 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Champion amendment 23-55 on Tailwheel Shimmy Dampener Continued (Bellanca) for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (Trytek) Series Tailwheel Assemblies, Tailwheel Shimmy Dampener for Scott & (Aeronca) revision IR, dated 1/23/2021, or later FAA approved revision ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision American 11CC, S11CC A-796 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Champion amendment 23-55 on Tailwheel Shimmy Dampener Continued (Bellanca) for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (Trytek) Series Tailwheel Assemblies, Tailwheel Shimmy Dampener for Scott & (Aeronca) revision IR, dated 1/23/2021, or later FAA approved revision ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 2 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener AeroSedan, LLC 15AC, S15AC A-802 14 CFR Part 23, Installation Instructions – Bolt- Instructions for (Rogers) amendment 23-55 on Tailwheel Shimmy Dampener Continued (Mitchell) for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (Aeronca) Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Textron 120, 140 A-768 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 3 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Textron 140A 5A2 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (when Series Tailwheel Assemblies, Tailwheel Shimmy converted to Dampener for Scott & conventional revision IR, dated 1/23/2021, or ABI 3200 & 3400 Series gear) later FAA approved revision Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Textron 150,150A, 150B, 150C,150D, 3A19 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. 150E, 150F, 150G, 150H, amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) 150J,150K, A150K, 150L, for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (when A150L, 150M, A150M, 152, Series Tailwheel Assemblies, Tailwheel Shimmy converted to conventional A152 revision IR, dated 1/23/2021, or Dampener for Scott & ABI 3200 & 3400 Series gear) later FAA approved revision Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 4 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Textron 170, 170A, 170B A-799 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Textron 172, 172A,172B,172C, 172D, 3A12 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. 172E, 172F (USAF T-41A), amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) (when 172G, 172H (USAF T-41A), for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on converted to 172I, 172K, 172L, 172M, 172N, Series Tailwheel Assemblies, Tailwheel Shimmy conventional gear) 172P, 172Q, 172R, 172S revision IR, dated 1/23/2021, or later FAA approved revision Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 5 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Textron 175, 175A, 175B, 175C 3A17 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) when for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on converted to Series Tailwheel Assemblies, Tailwheel Shimmy conventional Dampener for Scott & gear revision IR, dated 1/23/2021, or later FAA approved revision ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Topcub CC18-180, CC18-180A A00006SE 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aircraft, Inc. amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 6 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Cub Crafters CC21-180 A00057SE 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Cub Crafters CC19-180, CC19-215 A00053SE 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 7 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener FS2000 Corp. L-14 760 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision FS2001 Corp. J5A (Army L-4F), J5A-80, J5B (Army L-4G), J5C, AE-1, HE-1 A-725 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 8 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener FS2002 Corp. PA-14 A-797 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision FS2003 Corp. PA-12, PA-12S A-780 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 9 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener STOL Aviation S-1B1 (Army L-6, XL-6), S-1B2 A-754 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Luscombe 8, 8A, 8B, 8C, 8D, 8E, 8F, T-8F A-694 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 10 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Maule Bee Dee M-4, M-4, M-4C, M-4S, M-4T, M-4-180C, M-4-180S, M-4-180T, M-4-210, M-4-210C, M-4-210S, M-4-210T, M-4-220, M-4-220C, M-4-220S, M-4-220T, M-5-180C, M-5-200, M-5-210C,M-5-210TC, M-5-220C, M-5-253C, M-6-180, M-6-235, M-7-235, MX-7-235, MX-7-180, MX-7-420, M-8-235, MX-7-160, MX-7-180A, MX-7-180B, M-7-235B, M-7-235A, M-7-235C, MX-7-180C, M-7-260, M-7-260C, M-7-420AC, MX-7-160C, MX-7-180AC, M-7-420A 3A23 14 CFR Part 23, amendment 23-55 Installation Instructions – Bolton Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Instructions for Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 11 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Piper Aircraft, J3C-40, J3C-50, J3C-50S, A-691 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. J3C-65, J3C-65S, PA-11, PA-11S amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Piper Aircraft, J3F-50, J3F-50S, J3F-60, A-692 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. J3F-60S, (Army L-4D) J3F-65, amendment 23-55 on Tailwheel Shimmy Dampener Continued J3F-65S for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 12 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Piper Aircraft, J3L, J3L-S, J3L-65 (Army L-4C), A-698 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. J3L-65S amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Piper Aircraft, J4, J4A, J4A-S A-703 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 13 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Piper Aircraft, J4E (Army L-4E) A-740 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Piper Aircraft, PA-15 A-800 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 14 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Piper Aircraft, PA-16, PA-16S 1A1 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Piper Aircraft, PA-17 A-805 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 15 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Piper Aircraft, PA-18, PA-18S, 1A2 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. PA-18 "105" (Special), PA-18S "105" (Special), PA-18A, PA-18 "125" (Army L-21A), PA-18S "125", PA-18AS "125", PA-18 "135" (Army L-21B), PA-18A "135", PA-18S "135", PA-18AS "135", PA-18 "150", PA-18A "150", PA-18S "150", PA-18AS "150", PA-19 (Army L-18C), PA-19S amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Piper Aircraft, PA-18A (Restricted), AR-7 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. PA-18A "135" (Restricted), PA-18A "150" (Restricted) amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 16 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Piper Aircraft, PA-20, PA-20S, PA-20 "115", 1A4 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. PA-20S "115", Pa-20 "135", PA-20S "135" amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Piper Aircraft, PA-22, PA-22-108, PA-22-135, 1A6 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. (when PA-22S-135, PA-22-150, amendment 23-55 on Tailwheel Shimmy Dampener Continued converted to PA-22S-150, PA-22-160, for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on conventional PA-22S-160 Series Tailwheel Assemblies, Tailwheel Shimmy gear) revision IR, dated 1/23/2021, or later FAA approved revision Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 17 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Aviat Aircraft, S-1S, S-1T, S-2, S-2A, S-2S, A8SO 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. S-2B, S-2C amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Aviat Aircraft, A-1, A-1A, A-1B, A-1C-180, A22NM 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. A-1C-200 amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 18 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Taylorcraft, (Army L-2G) BF, BFS, BF-60, A-699 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. BFS-60, BF-65, BFS-65, (Army L-2K) BF12-65, BFS12-65 amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Taylorcraft, BL, BLS, (Army L-2F) BL-65, A-700 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Inc. BLS-65, (Army L-2J) BL12-65, BLS12-65 amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 19 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Taylorcraft BC, BCS, BC-65, BCS-65, A-696 14 CFR Part 23, Installation Instructions – Bolt- Instructions for 2000, LLC. BC12-65 (Army L-2H), BCS12-65, BC12-D, BCS12-D, BC12-D1, BCS12-D1, BC12D-85, BCS12D-85, BC12D-4-85, BCS12D-4-85 amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Taylorcraft 19, F19, F21, F21A, F21B, F22, 1A9 14 CFR Part 23, Installation Instructions – Bolt- Instructions for 2000, LLC. F22A, F22B, F22C amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 20 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Univair 108, 108-1, 108-2, 108-3, A-767 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aircraft 108-5 amendment 23-55 on Tailwheel Shimmy Dampener Continued Corporation for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (Stinson) Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Textron 180, 180A, 180B, 180C, 180D, 5A6 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. 180E, 180F, 180G, 180H, 180J, amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) 180K for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 21 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Textron 182, 182A, 182B, 182C, 182D, 3A13 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. 182E, 182F, 182G, 182H, 182J, amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) 182S, 182T, 182K, 182L, 182M, for Scott & ABI 3200 & 3400 Airworthiness - Bolt-on (when 182N, 182P, 182Q, 182R, Series Tailwheel Assemblies, Tailwheel Shimmy converted to T182, T182T revision IR, dated 1/23/2021, or Dampener for Scott & ABI 3200 & 3400 Series conventional later FAA approved revision Tailwheel Assemblies, gear) revision IR, dated 02/02/2021, or later FAA accepted revision Textron 185, 185A, 185B, 185C, 185D, 3A24 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. 185E, A185E, A185F amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 22 of 23 United States Of America Department of Transportation - Federal Aviation Administration Keller Engineering Group, LLC. Approved Model List (AML) 18714 Mink Creek Number: SA02553AK Chugiak, Alaska 99567 Date of Issuance: August 30, 2021 Approved Model List for the Keller Engineering Group Tail Wheel Shimmy Dampener Textron 188, 188A, 188B, A188, A9CE 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aviation, Inc. A188A, A188B, T188C amendment 23-55 on Tailwheel Shimmy Dampener Continued (Cessna) for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Pacific FBA-2C, FBA-2C1, FBA-2C2, A7EA 14 CFR Part 23, Installation Instructions – Bolt- Instructions for Aerospace Ltd FBA-2C4, FBA-2C4T amendment 23-55 on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 1/23/2021, or later FAA approved revision Continued Airworthiness - Bolt-on Tailwheel Shimmy Dampener for Scott & ABI 3200 & 3400 Series Tailwheel Assemblies, revision IR, dated 02/02/2021, or later FAA accepted revision Page 23 of 23 ## Every issue (1) - September 16, 2021: Issued, Current. [certificate](https://openairdocs.org/files/sha256/3f/10/3f1077e47e35d257e3d830e48b57c85d1ea9a79349a4078704ff012926cd9d23), [AML_SA02553AK.pdf](https://openairdocs.org/files/sha256/04/89/04891d9daa5a8ea600090ddfcaeea6ecf4d0995c8330f06065e4701970d921c5) --- 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.