# STC SA312NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Kenmore Air Harbor Inc, United States - Description: Installation of EDO 628-2960 floats. - Applied: May 12, 1976 - Status date: April 5, 2019 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS 5A6](https://openairdocs.org/tcds/5A6) - Certificate PDF: https://openairdocs.org/files/sha256/8f/22/8f226d48047d40a2473cb742fc8b8ba3f8ab0862004e493c4966b74d5b454696 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/612F27457A479D59862585CE0046E4EE.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA312NW ## ADs that name it (0) None. ## Approved models (7) - Cessna Aircraft Company 180 ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180A ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180B ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180C ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180D ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180E ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180F ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) ## 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 SA312NW This certificate, issued to Kenmore Air Harbor, LLC. 6321 NE 175th Street Kenmore, WA 98028 Part 3 of the Civil Air Regulations. Original ProductType Certificate Number: 5A6 Make: Cessna Model: 180 through 180F Description of the Type Design Change: Installation of EDO 628-2960 floats in accordance with EDO Drawing 55770 and a positive flight control rudder trim system in accordance with Positive Flight Control Drawing No. 023 - 0113. 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. A copy of this Certificate , Addendum No. SA312NW and Positive Flight Control Drawing No. 02-0113 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: May 12, 1976 Date reissued: April 5, 2019 Date of issuance: June 23, 1976 Date amended: June 6, 1977 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 SA312NW Kenmore Air Harbor, LLC. Issued: June 23, 1976 Reissued: April 5, 2019 Amended: June 6, 1977 **SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA312NW** The conditions and limitations of the original specifications apply except as follows: This Addendum, which is part of the Supplemental Type Certificate No. SA312NW, 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 perm anent records. SUPPLEMENTAL TYPE CERTIFICATE HOLDER: Kenmore Air Harbor, LLC. **CESSNA 180 THRU 180F (SEAPLANE-NORMAL CATEGORY) AS MODIFIED BY STC SA312NW** Serial Numbers Eligible: See Data Sheet 5A6 Airspeed Limits: Never exceed – 184 mph (160 knots) Maneuvering – 122 mph (106 knots) Max. structural cruising – 160 mph (139 knots) Flaps extended – 100 mph (87 knots) Powerplant Instrument Markings: Same as specified Maximum Weight: 2820 pounds Center of Gravity Limits With Edo 628-2960 Floats: (+40.2) to (+43.9) at 2820 pounds (+35.0) to (+43.9) at 2125 pounds or less Placards: A placard must be installed on the instrument panel in full view of the pilot as follows: - END - **FAA FORM 8110-2 (5/14) PAGE 3 OF 3 PAGES** **GROSS WIGHT IS LIMITED TO 2820 LBS.** WHEN EDO 628-2960 FLOATS ARE INSTALLED. PILOT IS RESPONSIBLE FOR PROPER LOADING. (SEE WEIGHT & **BALANCE DATA)** ## Every issue (2) - April 5, 2019: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8f/22/8f226d48047d40a2473cb742fc8b8ba3f8ab0862004e493c4966b74d5b454696) - June 6, 1977: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/e0/1b/e01bce310c9ab1b625bc07cec674ce04919205075686ef7b68176be685cf9a16) --- 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.