# STC SA1213NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Herning Benjamin N., United States - Description: Installation of a Franklin 6AS-350-A or A1 engine, Rajay Model 325E10 turbocharger, McCauley 2A34C22-N/84S-4, -6, or -8; or a Hartzell HC-C2YF-1BF/F8459A-4 to -8 propeller, and associated systems. - Applied: July 2, 1980 - Status date: July 24, 2007 - Product: Aircraft, Single-Engine - Certification basis: Part 3, Part 21, Part 36 - Data sheets: [TCDS 3A23](https://openairdocs.org/tcds/3A23) - Certificate PDF: https://openairdocs.org/files/sha256/75/14/7514bca363eae18dc6ce64af4afc2a5eb5da7e597ab2223b15a0bcb097fea806 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5C3B83907DC85A886257328006536A1.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA1213NW ## ADs that name it (0) None. ## Approved models (3) - Maule Aerospace Technology Inc. M-4-220C ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-4-220S ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-4-220T ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) ## 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. This Certificate issued to BENJAMIN N. HERNING 23847 Hilltop Drive Chugiak, AK 99567-6271 Part 3* of the Civil Aviation Regulations *effective May, 15, 1956 Original Product Type Certificate Number : 3A23 Maule M-4-220C, M-4-220S, M-4-220T Description of Type Design Change : Installation of a Franklin 6AS-350- A, or -A1 engine, Rajay Model 325E10 turbocharger, McCauley 2A34C22-N/84S-4, -6, or -8; or a Hartzell HC-C2YF-1BF/F8459A-4 to - 8 propeller, and associated systems in accordance with Seaplane Flying, Inc. Assembly and Installation Instructions No. SFM 4002. Limitations and Conditions: Approval of this change in type design applies to the above models aircraft only. This approval should not be extended to ai rcraft of these models on which other previously approved modifications are incorporated unless it is dete rmined that the relationship 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 aircra ft. A copy of this Certificate and Addendum No. SA1213NW, must be maintained as part of the permanen t 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 : July 2, 1980 Date of issuance : April 10, 1981 Date reissued : March 2, 1993, July 24, 2007 ( Signature) Manager, Technical and Administrative Support Staff Los Angeles Aircraft Certification Office NOTE: **DO NOT DELETE THIS PAGE.** **DO NOT ADD ANY DATA TO THIS PAGE.** **THIS PAGE IS FOR PAGE NUMBERING PURPOSES, PLEASE DISCARD PRINTED COPY.** Number SA1213NW **SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA1213NW** The conditions and limitations of Type Certificate Data Sheet No. 3A23 apply except where superseded by the following: This Supplemental Type Certificate Data Sheet, which is part of STC SA1213NW prescribes the conditions and limitations under which the STC was issued and meets the airworthiness requirements of the Civil Air Regulations. A copy of this STC Addendum is required to be maintained as part of the permanent records for the modified aircraft. MODEL MAULE M-4-220C, M-4-220S, AND M-4-220T 4PCLM NORMAL CATEGORY AS MODIFIED BY STC SA1213NW Engine: Franklin 6AS-350-A and 6AS-350-A1 Engine Limits: Takeoff (1 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 2A34C22/84S-4 through -8 Diameter: 78” maximum; 72” minimum Governor: Woodward 210453 Spinner: Cessna 0552016-1 2. Hartzell HC-C2YF-1BF/F8459-4 to -8 Diameter: 80” maximum; 76” minimum Governor: Woodward 210453 Spinner: Hartzell 82A4203 Powerplant Instrument Markings: Oil Temperature: Green Arc 100 oF to 235oF – normal operating range Yellow Arc 60 oF – caution Red Line 250 oF – 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 Number SA1213NW Powerplant Instrument Markings: 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 Cylinder Head Temperature (Well-Type Thermocouple); Green Arc 200 oF to 400oF - normal operating range Red Line 400 oF – maximum C. G. Range: See Type Certificate Data Sheet 3A23 Maximum Weight: See Type Certificate Data Sheet 3A23 Placards: 1. The following placard is to be in front and in full view of the pilot: ENGINE LIMITS TAKEOFF: ONE MIN. 2800 RPM @ 40” M.P. METO POWER: 2800 RPM @ 35” M.P. (SEA LEVEL TO 15,000’) 2. Install the Fuel Pump Operation Decal adjacent to the fuel boost pump switch: **FUEL BOOST PUMP OPERATION** 1. BOOST PUMP “ON” ABOVE 2600 RPM @ 34” M.P. 2. BOOST PUMP “OFF” BELOW 2600 RPM @ 34” M.P. **EMERGENCY OPERATION** 1. PRIMARY FUEL PUMP FAILURE: BOOST PUMP ‘ON’ CONTINUOUS 2. ELECTRICAL SYSTEM FAILURE: TURBO WASTE-GATE “OPEN” **3. PROCEED TO THE NEAREST AIRPORT** Number SA1213NW Placards (continued): 3. Install Turbo Control deal adjacent to the turbo control: **TURBO CONTROL** IN – HI. MFP 4. Install Cowl Flap decal adjacent to the cowl flap control: **COWL FLAP** **PUSH OPEN** 5. Install the carb Alternate Air decal adjacent to the carburetor alternate air control in place of “CARB HEAT” decal: **CARB ALTERNATE AIR** **PULL - OPEN** NOISE CERTIFICATION PROCEDURE: Compliance with Part 36, Appendix F, was shown with the following procedures: Level flyover at 1,000 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 70oF, 77% R.H. acoustic day as well as a -5 dB(A) credit resulting from takeoff and climb characteristics. -END- ## Every issue (1) - July 24, 2007: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/75/14/7514bca363eae18dc6ce64af4afc2a5eb5da7e597ab2223b15a0bcb097fea806) --- 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.