# STC SA586NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Franklin Aircraft Engines Inc., United States - Description: Installation of a Franklin 6AS-350-A and -A1 engine. - Applied: March 10, 1978 - Status date: April 9, 1999 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS 3A17](https://openairdocs.org/tcds/3A17) - Certificate PDF: https://openairdocs.org/files/sha256/61/1b/611b326d03e6c18478ebf06513421abea6475e16adcac1159a218f7f1daca3f3 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/15726514FB024AD285256CC200122C15.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA586NW ## ADs that name it (0) None. ## Approved models (4) - Cessna Aircraft Company 175 ([TCDS 3A17](https://openairdocs.org/tcds/3A17)) - Cessna Aircraft Company 175A ([TCDS 3A17](https://openairdocs.org/tcds/3A17)) - Cessna Aircraft Company 175B ([TCDS 3A17](https://openairdocs.org/tcds/3A17)) - Cessna Aircraft Company 175C ([TCDS 3A17](https://openairdocs.org/tcds/3A17)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SASSonW This certificate issued to: Franklin Aircraft Engines, Inc. 136 Racquette Drive Fort Collins, CO 80524 Part 3 of the Civil Air Foegulations. Original Product --Typs Certifoate Number: 3A17 Моико: Cessna Model: 175, 175A, 175B, and 175C (Landplane & Seaplane) Description of Type Design Change: Installation of Franklin 6AS-350-A or 6AS-350-A1 engines and McCauley 2A31C21/845- 4, -6, and -8, Hartzell HC-C2YF-1BF/F8459A-4, -6, -8, and Hartzell HC-C2YF-1BF/F8459A-4Q, -6Q, -8Q, propeller in accordance with Seaplane Flying, Inc. Assembly and Installation Numbers 6620 and 20820. NOTE: This approval is extended to those models above modified with Aqua 2400 Seaplane Floats as per STC SA66SCE. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated, unless it is determine by the installer that the interrelationship between this change and any other previously approved modifications will produce no adverse effect upon the airworthiness of tlat airplane. 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. A copy of this Certificate and Addendum No. SA586NW must be maintained as part of the permanent records for the modified aircraft. (See continuation sheet 3 of 5) Sconyers TOMINSTRATOR Atlanta Aircraft Certification Office Associate Manager (Title) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SAS86NW Date of Issuance: July 28, 1978 Date Amended: September 17, 1986 Limitations and Conditions: (Continued): Supplemental Type Certificate ADDENDUM NO. SA586NW Supplemental Type Certificate Holder: Franklin Aircraft Engines, Inc. The conditions and limitations of Type Certificate Data Sheet Number 3A17 apply except where superseded by the following: Supplemental Type Certificate Data Sheet which is part of STC SA586NW, prescribes the conditions and limitations under which the STC was issued and meets the airworthiness requirements of the Civil Air Regulations. MODEL CESSNA 175, 175A, 175B, and 175C, 4PCLM (NORMAL CATEGORY) AS MODIFIED BY STC 5A586NW. Engine: Franklin 6AS-350-A and 6AS-350-A1 Engine Limits: Takeoff (5 min.) 2800 rpm (250 Hp.) @ sea level Maximum continuous power -2600 rpm full throttle Fuel: 100/130 octane minimum grade aviation gasoline Propeller and Propeller Limits: 1. McCauley 2A31C21/84S-4 to-8 Diameter: 78" Maximum; 72" minimum FAA FORM 8110-2-1(10-69) PAGE 2of 5 PAGES United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SAS86NW Date of Issuance: July 28, 1978 Date Amended: September 17, 1986 Limitations and Conditions: (Continued): Governor: Woodward 210453 or 210660 Hartzell 49F4-9 Spinner: Cessna 0552016-1 2. Hartzell HC-C2YF-1BF/F8459-4 to -8 Diameter: 80" maximum; 76" minimum Governor: Woodward 210453 or 210660 Hartzell 49F4-9 Spinner: Hartzell 82A4203 3. Hartzell HC-C2YF-1BF/F8459A-4Q to -8Q Diameter: 80" maximum; 76" minimum Governor: Woodward 210453 or 210660 Hartzell 49F4-9 Spinner: Hartzell 82A4203 Powerplant Instrument Markings: Oil Temperature: Green Arc 100°F to 235° F - normal operating range Yellow Arc 60° F - caution Red Line 235° F-maximum Oil Pressure Green Arc 55 to 80 psi - normal operating range Yellow Arc 25 to 55 psi and 80 to 100 psi - caution Red Line 25 psi minimum, 100 psi maximum Tachometer: Green Arc 1500 to 2600 rpm - normal operating range Red Line 2600 rpm - maximum Fuel Pressure: Green Arc 10 to 14 psi- normal operating range Red Line 14 psi - maximum at sea level FAA FORM 8110-2-1(10-69) PAGE 3of 5 PAGES United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA586NW Date of Issuance: July 28, 1978 Date Amended: September 17, 1986 Limitations and Conditions: (Continued): Cylinder Head Temperature (Well-Type Thermocouple): Green Arc 200°F to 400°F - normal operating range Red Line 400°F-maximum C. G. Range: See Type Certificate Data Sheet 3A17 Maximum Weight See Type Certificate Data Sheet 3A17 Placards: The following placard is to be in front and in full view of the pilot: ENGINE LIMITS TAKEOFF: ONE MIN. 2800 RPM M.C.P. 2600 RPM, FULL THROTTLE NOISE CERTIFICATION PROCEDURE: Compliance with FAR 36, Appendix F, was shown with the following procedures: Level flyover at 1000 feet AGL at 2600 engine rpm and full throttle manifold pressure. The certificated noise level is 70.9 dB(A). This noise level reflects correction of as measured data to a standard 70° F, 77% R.H. acoustic day as well as a -5 dB(A) credit resulting from aircraft takeoff and climb characteristics. -End- FAA FORM 8110-2-1 (10-69) PAGE 4of 5 PAGES ## Every issue (1) - April 9, 1999: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/61/1b/611b326d03e6c18478ebf06513421abea6475e16adcac1159a218f7f1daca3f3) --- 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.