# STC SA523NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Kenmore Air Harbor LLC, United States - Description: Installation of float hatch covers on Edo 58-4580, 348-4580 or 679-4930 floats. - Applied: September 26, 1977 - Status date: April 5, 2019 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS A-806](https://openairdocs.org/tcds/A-806) - Certificate PDF: https://openairdocs.org/files/sha256/2b/d4/2bd475e21010a5b8c872b0f5e34e1c95fadc8e27d0512274776f1059d81f6c21 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BB5411422F9D07C0862585CE005488DA.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA523NW ## ADs that name it (0) None. ## Approved models (2) - de Havilland Inc. (Canada) DHC-2 Mk.I ([TCDS A-806](https://openairdocs.org/tcds/A-806)) - de Havilland Inc. (Canada) DHC-2 Mk.III ([TCDS A-806](https://openairdocs.org/tcds/A-806)) ## 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. Number SA523NW This certificate, issued to Kenmore Air Harbor, LLC. 6321 NE 175th Street Kenmore, WA 98028 Part 10 of the Civil Air Regulations Equivalent to CAR 3, dated November 13, 1945; and FAR 21.29(a)(1)(ii). Original ProductType Certificate Number: A-806 Make: DeHavilland Model: DHC-2 Mk I and Mk III Description of the Type Design Change: Installation of float hatch kits on Edo (Bristol) model 58-4580, 348-4580, or 679-4930 seaplane floats in accordance with Kenmore Air Harbor, Inc. Installation Instructions No. K9011 dated September 21, 1977 and Float Hatch Installation Drawing Tree, K-250-1, dated February 24, 2005 or later Federal Aviation Administration approved revisions. Limitations and Conditions: Approval of this change in type design applies basically to the above model aircraft only. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship 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. A copy of this Certificate shall 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. Date of application: September 26, 1977 Date reissued: April 5, 2019 Date of issuance: October 11, 1977 Date amended: March 28, 1986; May 20, 2005 **FAA FORM 8110-2 (5/14) PAGE 1 OF 2 PAGES** (Signature) Acting Manager, Seattle ACO Branch (Title) Transfer the ownership of Supplemental Type Certificate Number to (Name of Transferee) (Address of Transferee) (Number and Street) (City, State, and ZIP Code) from (Name of Grantor) (Print or Type) (Address of Grantor) (Number and Street) (City, State, and ZIP Code) Signature of Grantor (In Ink): U.S. GPO: 1987-763-289 ## Every issue (2) - April 5, 2019: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/2b/d4/2bd475e21010a5b8c872b0f5e34e1c95fadc8e27d0512274776f1059d81f6c21) - May 20, 2005: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/b7/4c/b74c36f6398e0f0f94ea97900a75ad9eb9b2ea48bd794bfcd5dccde1a1bbb0b9) --- 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.