# STC SA87NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Kenmore Air Harbor Inc, United States - Description: Installation of Lycoming O-360-A1A180 h.p. engine and Hartzell HC- C2YK-1A/7666A-0 propeller. - Applied: August 8, 1973 - Status date: April 5, 2019 - Product: Aircraft, Small Airplane - Certification basis: Part 3, Part 21 - Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12) - Certificate PDF: https://openairdocs.org/files/sha256/8d/01/8d01033a5722109e5a7c7d3a1766be91b36d48adfa5f4eefd06783ca71a86086 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F7911AE00B43C584862585CE00459919.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA87NW ## ADs that name it (0) None. ## Approved models (15) - Cessna Aircraft Company 172A ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172B ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172C ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172D ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172E ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172F ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172F (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172G ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172H ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172H (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172I ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172K ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172L ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172M ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) - Cessna Aircraft Company 172N ([TCDS 3A12](https://openairdocs.org/tcds/3A12)) ## 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 SA87NW This certificate, issued to Kenmore Air Harbor, LLC. 6321 NE 175th Street Kenmore, WA 98028 Part 3 of the Civil Air Regulations,effective November 1, 1949, as amended by 3-1 through 3-12. Original ProductType Certificate Number: 3A12 Make: Cessna Model: 172A through 172N (Landplane/Seaplane) (Normal Category Only) Description of the Type Design Change: Installation of Lycoming 0-360-A1A, 180 Hp engine and Hartzell HC- C2YK-1A/7666A-0 propeller as indicated in Continuation Sheets 3 through 5, Data required: (1) AVCON Industries, Inc., Drawing List 17213 (Models 172A through 172H) or A17213 (Models 172I through 172N ) dated December 3, 1973. (2) Incorporation of Marvel-Schebler MA-4-5 carburetor, Part No. 10-3878M or 10-4164. (3) A copy of this Certificate, including Continuation Sheets is required. (4) Deletion of requirement for lower cowl lip as specified in AVCON Industries, Inc. Drawing 17213A dated March 25, 1971, as applicable to Models 172I through 172N only. 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. Date of application: August 8, 1973 Date reissued: April 5, 2019 Date of issuance: January 9, 1974 Date amended: December 12, 1974; February 27, 1976; August 24, 1976; May 7, 1979 FAA FORM 8110-2 (5/14) PAGE 1 OF 6 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 SA87NW Kenmore Air Harbor, LLC. Issued: January 9, 1974 Reissued: April 5, 2019 Amended: December 12, 1974; February 27, 1976; August 24, 1976; May 7, 1979 This approval is also extended to the installation in the above models with Pee Kay Model 2300 seaplane floats in accordance with the Pee Kay Float Division STC SA358NW and Edo Model 689 -2130 seaplane floats (on Cessna 172L, M, and N models only) in accordance with Edo Drawing 689-1100. A copy of this Certificate and Addendum No. SA87NW shall be maintained as a 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. **SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA87NW** The conditions and limitations of the original specifications apply except as follows: This Addendum, which is part of the Supplemental Type Certificate No. SA87NW, 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. **MODEL 172A THROUGH 172N 4PCL-SM (NORMAL CATEGORY) AS MODIFIED BY STC SA87NW** Engine: Lycoming 0-360-A1A Fuel: 91/96 minimum grade aviation gasoline (unusable fuel capacity unchanged) Engine Limits: For all operations 2700 rpm (180 Hp) Propeller and Propeller Limits: Hartzell HC-C2YK-1A/7666A-O Diameter: Not over 76”; Not under 74” Placard: “AVOID CONTINUOUS OPERATION BETWEEN 2000 AND 2250 RPM” Pitch Settings: 11º Low; 29 º High **FAA FORM 8110-2 (5/14) PAGE 3 OF 6 PAGES** Number SA87NW Kenmore Air Harbor, LLC. Issued: January 9, 1974 Reissued: April 5, 2019 Amended: December 12, 1974; February 27, 1976; August 24, 1976; May 7, 1979 SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA87NW (Continued) Powerplant Instrument Markings: Tachometer: 2700 rpm (red line) 2000 – 2250 rpm (red arc) Oil Temperature: 245 ºF (red line) Oil Pressure: 25 psi minimum (red line) 100 psi maximum (red line) 60 to 90 psi normal (green arc) Fuel Pressure: .5 psi minimum (red line) 8 psi maximum (red line) 3 to 5 psi normal (green arc) Center of Gravity Range: (NORMAL CATEGORY) Seaplane (Edo 89-2000 or 89A-2000 floats): (+39.8) to (+45.5) at 2220 pounds (+36.4) to (+45.5) at 1825 pounds or less Seaplane (Edo 689-2130 floats)Cessna 172L, M, N: (+40.9) to (+45.5) at 2350 pounds (+36.4) to (+45.5) at 1825 pounds or less Seaplane (Pee Kay 2300 floats) Models 172A, B, C: (+40.0) to (+45.5) at 2250 pounds (+36.4) to (+45.5) at 1825 pounds or less Seaplane (Pee Kay 2300 floats) Models 172D thru N: (+40.5) to (+45.5) at 2300 pounds (+36.4) to (+45.5) at 1825 pounds or less Landplane: See Certificate data Sheet 3A12 **STRAIGHT LINE VARIATION BETWEEN POINTS GIVEN** **FAA FORM 8110-2 (5/14) PAGE 4 OF 6 PAGES** Number SA87NW Kenmore Air Harbor, LLC. Issued: January 9, 1974 Reissued: April 5, 2019 Amended: December 12, 1974; February 27, 1976; August 24, 1976; May 7, 1979 SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA87NW (Continued) Maximum Weight: Normal Category: Edo Seaplane 2220 pounds Edo Seaplane 2350 pounds (Models 172L, 172M, 172N) Pee Kay Seaplane 2250 pounds (Models 172A thru C) Pee Kay Seaplane 2300 pounds (Models 172D thru N) Serial Numbers Eligible: See Type Certificate Data Sheet 3A12 Certification Basis: Same as specified in Type Certificate data Sheet No. 3A12. Production Basis: NONE. Prior to returning to service, conformity to approved data must be determined for components not identified by Form 8130.3, Parts Manufacturer Approval, or other evidence of FAA Production Approval. 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 placards must be displayed as indicated: (1) Adjacent to or in close proximity to the aircraft identification plate: (2) Above the Fuel Pump Switch: (3) On the Dome Light Fuse Placard: **FAA FORM 8110-2 (5/14) PAGE 5 OF 6 PAGES** KENMORE AIR HARBOR Kenmore, Washington Lycoming 0-360-A1A Engine Installation STC SA87NW, Date Installed Fuel Pump – Pull ON Fuel Pump Number SA87NW Kenmore Air Harbor, LLC. Issued: January 9, 1974 Reissued: April 5, 2019 Amended: December 12, 1974; February 27, 1976; August 24, 1976; May 7, 1979 SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA87NW (Continued) (4) On Nav Light Fuse Placard: (5) In Close Proximity to the Tachometer: NOTE 3: With the described engine and propeller installation, performance will be at least equal to or better than that given in the original FAA Approved Flight Manual for the Cessna 172 series airplanes. - END - **FAA FORM 8110-2 (5/14) PAGE 6 OF 6 PAGES** Nav and Starter **AVOID CONTINUOUS OPERATION BETWEEN 2000 AND 2250 RPM** ## Every issue (2) - April 5, 2019: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8d/01/8d01033a5722109e5a7c7d3a1766be91b36d48adfa5f4eefd06783ca71a86086) - May 7, 1979: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/a1/37/a137823a1b864143525387bc3121b1897b332897e8fda121ad7c99b30239fc06) --- 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.