# STC SR02599SE - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Kawak Aviation Technologies, Inc., United States - Description: Installation of a Kawak Aviation Technologies Model 41300 auxiliary hydraulic system. - Applied: March 1, 2017 - Status date: March 30, 2026 - Product: Aircraft, Rotorcraft - Certification basis: Part 29 - Data sheets: [TCDS R0011DE](https://openairdocs.org/tcds/R0011DE), [TCDS R0015DE](https://openairdocs.org/tcds/R0015DE), [TCDS R00115SE](https://openairdocs.org/tcds/R00115SE), [TCDS R00051SE](https://openairdocs.org/tcds/R00051SE), [TCDS R00024LA](https://openairdocs.org/tcds/R00024LA), [TCDS R0014DE](https://openairdocs.org/tcds/R0014DE) - Certificate PDF: https://openairdocs.org/files/sha256/43/db/43dbacb17def58b209fb25722fb13cc4392f2ead2f3769ff1378d8ce770afc44 - Approved model list and other attachments: [SR02599SE_AML.pdf](https://openairdocs.org/files/sha256/45/7d/457df9c8f55db186dadd3b4bc5e3c985b70d04bd7ba8a5a8e61d496992d9be81) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID124837955820260428145512.0001 - DRS record last changed: April 28, 2026 - Page: https://openairdocs.org/stc/SR02599SE ## ADs that name it (0) None. ## Approved models (6) - Billings Flying Service Inc CH-47D ([TCDS R0011DE](https://openairdocs.org/tcds/R0011DE)) - Billings Flying Service Inc. CH-47D ([TCDS R00115SE](https://openairdocs.org/tcds/R00115SE)) - Billings Flying Service, Inc. CH-47D ([TCDS R0015DE](https://openairdocs.org/tcds/R0015DE)) - Columbia Helicopters Inc. CH-47D ([TCDS R00051SE](https://openairdocs.org/tcds/R00051SE)) - Tandem Rotor LLC CH-47D ([TCDS R0014DE](https://openairdocs.org/tcds/R0014DE)) - Unical Air Inc. CH-47D ([TCDS R00024LA](https://openairdocs.org/tcds/R00024LA)) ## 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. FAA 8110-2 (10/24) Page 1 of ___ Installation of a Kawak Aviation Technologies Model 41300 auxiliary hydraulic system. This system must be installed in accordance with Kawak Aviation Technologies Document KATI-IM-830, Revision A, dated April 26, 2018, or later FAA approved revision. Maintained in accordance with these Instructions for Continued Airworthiness Kawak Aviation Technologies Document KATI-MM-830, Revision A, dated April 19, 2023, or later FAA approved revision. Operated in accordance with FAA Approved Rotorcraft Flight Manual Supplement KATI-FM-830, Revision IR, dated May 18, 2018, or later FAA approved revision. Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of this model series unless the installer determines that the relationship between this change and any other previously incorporated approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. (See Continuation Sheet Page 3 of 3 Pages) *See attached Federal Aviation Administration (FAA) Approved Model List (AML) SR02599SE for approved aircraft Models and applicable airworthiness regulations. SR02599SE Kawak Aviation Technologies, Inc. 20690 Carmen Loop Road, Suite 102 Bend, OR 97702 * * * 03/01/2017 03/30/2026 05/21/2018 09/13/2023 for Manager, West Certification Branch 3 SR02599SE 03/30/2026 3 SR02599SE 03/30/2026 Limitations and Conditions (continued): A copy of this certificate, Instructions for Continued Airworthiness and FAA Approved Rotorcraft Flight Manual Supplement must be maintained as part of the permanent records for the modified aircraft. If the holder agrees to permit another person to use this certificate to alter the product,the holder shall give the other person written evidence of that permission. Certification Basis: The certification basis for this modification is in accordance withType Certificate Data Sheet R0011DE Revision 6 and R0015DE Revision IR. ------------------End----------------- 3 3 Add Page ### SR02599SE_AML.pdf FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR02599SE FOR Installation of an Auxiliary Hydraulic System On CH-47D Helicopters ISSUE DATE: September 13, 2023 Page 1 of 1 **ITEM AIRCRAFT /** **ROTORCRAFT MAKE** **AIRCRAFT /** **ROTORCRAFT MODEL** **ORIGINAL TC NUMBER** **CERTIFICATION** **BASIS FOR** **ALTERATION** **FAA APPROVED** **AIRCRAFT /** **ROTORCRAFT FLIGHT MANUAL** **SUPPLEMENT** **FAA APPROVED** MASTER DRAWING LIST AML REV DATE Number Revision* Drawing Revision* 1. Billings Flying Service Inc. CH-47D R0011DE 14 CFR Part 29 Amendment 20 **KATI-FM- 830 IR 41300- 000-MDL F 9/13/2023** 2. Billings Flying Service Inc. CH-47D ROO15DE 14 CFR Part 29 Amendment 20 **KATI-FM- 830 IR 41300- 000-MDL F 9/13/2023** 3. Billings Flying Service Inc. CH-47D R00115SE 14 CFR Part 29 Amendment 20 **KATI-FM- 830 IR 41300- 000-MDL F 2/27/2026** 4. Colombia Helicopters Inc. CH-47D R00051SE 14 CFR Part 29 Amendment 20 **KATI-FM- 830 IR 41300- 000-MDL F 2/27/2026** 5. Unical Air, Inc. CH-47D R00024LA 14 CFR Part 29 Amendment 20 **KATI-FM- 830 IR 41300- 000-MDL F 2/27/2026** 6. Tandem Rotor, LLC. CH-47D R0014DE 14 CFR Part 29 Amendment 20 KATI-FM- 830 IR 41300- 000-MDL F 2/27/2026 * Or later FAA Approved Revision FAA Approved: for Manager, West Certification Branch AMENDED: February 27, 2026 REISSUED: March 30, 2026 ## Every issue (3) - March 30, 2026: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/43/db/43dbacb17def58b209fb25722fb13cc4392f2ead2f3769ff1378d8ce770afc44), [SR02599SE_AML.pdf](https://openairdocs.org/files/sha256/45/7d/457df9c8f55db186dadd3b4bc5e3c985b70d04bd7ba8a5a8e61d496992d9be81) - September 13, 2023: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/43/55/435548c3360c17cb2dc3865125aca4d670207846985606dd76db63ecd0a858fc), [SR02599SE_AML.pdf](https://openairdocs.org/files/sha256/e7/ef/e7ef1d98e07ac41b5937661488b3b71c8c0ce8586f66614919919b48a7c8eca0) - May 21, 2018: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/29/fc/29fc9456ed74fbc34ee3df6673692e6a7e835fefb74d64748da7016bb0cb7099) --- 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.