# STC SA526NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Kenmore Air Harbor LLC, United States - Description: Installation of Edo Model 582-3430 seaplane floats. - Applied: September 20, 1977 - Status date: April 5, 2019 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS 3A24](https://openairdocs.org/tcds/3A24) - Certificate PDF: https://openairdocs.org/files/sha256/49/5d/495d9a7c9b52a97dd93400f87627b216fd861aa41f9cfeb4ce30420c948c84ce - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/82624A3F128C1254862585CE00548C02.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA526NW ## ADs that name it (0) None. ## Approved models (6) - Cessna Aircraft Company 185 ([TCDS 3A24](https://openairdocs.org/tcds/3A24)) - Cessna Aircraft Company 185A ([TCDS 3A24](https://openairdocs.org/tcds/3A24)) - Cessna Aircraft Company 185B ([TCDS 3A24](https://openairdocs.org/tcds/3A24)) - Cessna Aircraft Company 185C ([TCDS 3A24](https://openairdocs.org/tcds/3A24)) - Cessna Aircraft Company 185D ([TCDS 3A24](https://openairdocs.org/tcds/3A24)) - Cessna Aircraft Company 185E ([TCDS 3A24](https://openairdocs.org/tcds/3A24)) ## 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 SA526NW This certificate, issued to Kenmore Air Harbor, LLC. 6321 NE 175th Street Kenmore, WA 98028 Part 3 of the Civil Air Regulations,dated May 15, 1956, as amended by 3-1 though 3-5. Original ProductType Certificate Number: 3A24 Make: Cessna Model: 185 Through 185E Description of the Type Design Change: Installation of Edo 582-3430 seaplane floats in accordance with Edo Installation Drawing No. 62980. Limitations and Conditions: Approval of this change in type design applies basically to the above aircraft model 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. This approval is intended for installation in the above models with the Continental IO-520-D engine in accordance with Kenmore Air Harbor, Inc. STC SA525NW. A copy of this Certificate and Addendum No. SA526NW 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 t he other person written evidence of that permission. Date of application: September 20, 1977 Date reissued: April 5, 2019 Date of issuance: October 11, 1977 Date amended: FAA FORM 8110-2 (5/14) PAGE 1 OF 3 PAGES By direction of the Administrator (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 Number SA526NW Kenmore Air Harbor, LLC. Issued: October 11, 1977 Reissued: April 5, 2019 **SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA526NW** The conditions and limitations of Type Certificate Data Sheet No. 3A24 apply except as follows: This Addendum, which is part of the Supplemental Type Certificate No. SA526NW, prescribes the conditions and limitations under which the STC was issued and meets the airworthiness requirements of Civil Air Regulations Part 3. A copy of this Addendum shall be maintained as part of the modified aircraft permanent records. SUPPLEMENTAL TYPE CERTIFICATE HOLDER: Kenmore Air Harbor, LLC. **CESSNA 185 THRU 185E, 6PCL-SM (NORMAL CATEGORY) AS MODIFIED BY STC SA526NW** Engine: Continental IO-520-D (STC SA525NW) Propeller: McCauley D2A34C58/90AT-4 (T.C. 3A24) or McCauley D3A32C90/82NC-2 (STC SA240NW) Center of Gravity Limits: Seaplane (Normal Category) (+41.9) to (+46.5) at 3350 pounds (+35.1) to (+46.5) at 2200 pounds **STRAIGHT LINE VARIATION BETWEEN POINTS GIVEN** Maximum Weight: 3350 pounds Serial Numbers Eligible: See Type Certificate data Sheet 3A24. NOTE 1: Current weight and balance report, together with list of equipment included in certificated empty weight and loading instructions when necessary, must be provided for each aircraft at the time of modification. NOTE 2: The following additional placard must be displayed in full view of the pilot when floats are installed: NOTE 3: This STC is limited to those airplanes which incorporate the Cessna type design seaplane structural reinforcements and required seaplane equipment for the particular model except as modified or added to by the data specified in the STC. - END - **FAA FORM 8110-2 (5/14) PAGE 3 OF 3 PAGES** a. MAXIMUM DESIGN WEIGHT – 3350 POUNDS b. MAXIMUM ALTITUDE LOSS IN STALL RECOVERY – 130 FEET c. AVOID SIDESLIPS WITH FLAPS EXTENDED ## Every issue (2) - April 5, 2019: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/49/5d/495d9a7c9b52a97dd93400f87627b216fd861aa41f9cfeb4ce30420c948c84ce) - October 11, 1977: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/ce/5f/ce5f3d8d4b4e3ea73709b8b1dc47d7f796ec884cb17b4cd743011f4e79dd8227) --- 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.