# N145WM: 1976 Williams MONOCOUPE 90C - Status: Valid registration - Airframe: [Williams MONOCOUPE 90C](https://openairdocs.org/model/williams-monocoupe-90c) (registry code 0566113, 2 seats) - Engine: [Continental 0-300 series](https://openairdocs.org/engine/continental-0-300-series) (registry code 17022) - Data sheets: [TCDS E-253](https://openairdocs.org/tcds/E-253) (Continental Aerospace Technologies, Inc.) (OpenAirDocs) - Serial number: W-1 - Year built: 1976 - Type: Fixed wing single engine - Engine type: Reciprocating - Airworthiness: Experimental, amateur built - Airworthiness date: November 27, 1979 - Certificate issued: November 4, 2021 - Expires: November 30, 2028 - Mode S code: A0B743 - Registered owner: [Gwyn Kenneth R](https://openairdocs.org/faa-owner/GWYN%20KENNETH%20R) - Location: [Mount Airy, NC](https://openairdocs.org/faa-place/NC/Mount%20Airy) - Owner type: Individual - Owner's area on the map: 36.4898° N, 80.6292° W: Placed by OpenAirDocs at the center of ZIP code 27030, within about 7 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=145WM - Page: https://openairdocs.org/aircraft/N145WM From the FAA registry file of October 22, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Continental 0-300 model are included. ## ADs that may apply (OpenAirDocs): 10 in force ### Matched by airframe (Williams MONOCOUPE 90C) None in force. ### Matched by engine (Continental 0-300 series) - [AD 2023-17-04](https://openairdocs.org/ad/2023-17-04): Reciprocating Engine Oil System · F & M Enterprises' Model C6LC, C6LC-S or C6LC-L oil filter… (Stratus Tool Technologies STC SE09356SC or 2 others). Effective Oct 26, 2023 - [AD 2011-26-07](https://openairdocs.org/ad/2011-26-07): Engine · Continental Motors C-125-1, C-125-2, C145-2 and 48 more. Effective Jan 24, 2012 - [AD 98-17-11](https://openairdocs.org/ad/98-17-11): Crankshafts · Continental Motors A-65-3, A-65-8, A75-8 and 90 more. Effective Oct 19, 1998 - [AD 98-01-06](https://openairdocs.org/ad/98-01-06): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 184 more. Effective Feb 13, 1998 - [AD 94-05-05 R1](https://openairdocs.org/ad/94-05-05-R1): Cylinder Rocker · Continental Motors C-125-1, C-125-2, C145-2 and 59 more. Effective Feb 13, 1996 - [AD 95-21-15](https://openairdocs.org/ad/95-21-15): Aviation Gasoline · Continental Motors A-65-8, C85-12F, C85-12FJ and 77 more. Effective Nov 28, 1995 - [AD 93-19-04](https://openairdocs.org/ad/93-19-04): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 184 more. Effective Oct 18, 1993 - [AD 93-10-02](https://openairdocs.org/ad/93-10-02): Missing Cylinder Valve Retainer Key · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 180 more. Effective Aug 12, 1993 - [AD 93-11-03](https://openairdocs.org/ad/93-11-03): Incorrect Connecting Rod · Continental Motors O-200-A, O-300-A, O-300-C and 1 more. Effective Jul 13, 1993 - [AD 80-06-05](https://openairdocs.org/ad/80-06-05): Magnetos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 254 more. Effective Mar 28, 1980 ### Historical (superseded or no longer in force) - [AD 2022-04-04](https://openairdocs.org/ad/2022-04-04) (historical): Reciprocating Engine Oil System · F & M Enterprises' Model C6LC, C6LC-S or C6LC-L oil filter… (Stratus Tool Technologies STC SE09356SC or 2 others). Effective Mar 29, 2022 - [AD 2002-13-04](https://openairdocs.org/ad/2002-13-04) (historical): Magneto impulse coupling stop pin · Teledyne Continental Motors C-125-1, C-125-2, C145-2 and 48 more. Effective Jul 12, 2002 - [AD 2000-11-51](https://openairdocs.org/ad/2000-11-51) (historical): Magnetos · Teledyne Continental Motors IO-360 Series (all), LTSIO-520-AE, O-300-A and 21 more - [AD 94-14-12](https://openairdocs.org/ad/94-14-12) (historical): Octane Aviation Gasoline · Teledyne Continental Motors A-65-8, C85-12, E185-11 and 68 more ## Information bulletins (advisory) (3 in force) - [SAIB NE-18-27](https://openairdocs.org/saib/NE-18-27): POWERPLANT Rocker Shaft Boss Inspection. Issued Sep 10, 2018 - [SAIB NE-16-13](https://openairdocs.org/saib/NE-16-13): Powerplant - Prohibited use of sealant. Issued Mar 8, 2016 - [SAIB NE-13-04](https://openairdocs.org/saib/NE-13-04): Continental Motors, Inc. (CMI) Connecting Rod Piston Pin Bushing Inspection. Issued Oct 31, 2012 ## NTSB investigations None matched to N145WM. ## FAA accident and incident reports None matched to N145WM. ## Service difficulty reports None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. ## STCs that may be installed (OpenAirDocs) (37) Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do. ### Approved for the engine (Continental 0-300 series) - [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC. Lists O-300-A - [STC SE2932SW](https://openairdocs.org/stc/SE2932SW): Install carburetor air temperature indicator. Approved for Aircooled Motors (Franklin Engine Co.) equipped with float carburetors. Model eligibility included here may not be inclusive. Alcor LLC - [STC SE208SO](https://openairdocs.org/stc/SE208SO): Installation of ice indicator in the carburetor. LegacySTC.com - [STC SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd. Lists O-300-A - [STC SE00145WI](https://openairdocs.org/stc/SE00145WI): Installation of B&C Specialty Products Model BC 320-( ) Engine Starter. B & C Specialty Products Inc. Lists O-300-A - [STC SE03309CH](https://openairdocs.org/stc/SE03309CH): Installation of Engine Preheat Kit, p/n TSP6CYL-2927-115 for 115 volt application. Hartzell Propeller Inc. Lists O-300-A - [STC SE04577CH](https://openairdocs.org/stc/SE04577CH): Install an electronic engine ignition system. Electroair Acquisition Corp. Lists O-300-A - [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc. Lists O-300-A - [STC SE00533SE](https://openairdocs.org/stc/SE00533SE): Installation of Real Gasket Corporation Continental Engine Pushrod Tube Modification. Real Gaskets Tennessee. Lists O-300-A - [STC SE4725NM](https://openairdocs.org/stc/SE4725NM): Installation of an O-3000-A crankshaft, P/N 530860, equipped with an O-3000-D cluster fear, P/N 627846, in an O-3000-D engine. General Aviation Concepts. Lists O-300-D - [STC SE8409SW](https://openairdocs.org/stc/SE8409SW): Installation of P/N CO-300-1 Oil Filter Adaptor with spin-on filter as a replacement for the existing oil screen. Stratus Tool Technologies LLC. Lists O-300-A - [STC SE10076SC](https://openairdocs.org/stc/SE10076SC): Modify engine by installation of C12ST2/S starter. Hartzell Engine Technologies, LLC. Lists O-300-A - [STC SE10129SC](https://openairdocs.org/stc/SE10129SC): Installation of rotocoil, valve springs, ni-resist valve guide, exhaust valve with chrome flash on stem, and rocker shaft with thrust buttons. Continental Motors, Inc. Lists O-300-A - [STC SE34WE](https://openairdocs.org/stc/SE34WE): Installation of Electro-Coatings, Inc., piston rings on Continental pistons. Continental Motors, Inc. Lists O-300-A - [STC SE8112SW](https://openairdocs.org/stc/SE8112SW): Installation of any or all parts identified by Parts Application List AEC9109-2. Continental Motors, Inc. Lists O-300-A - [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc. Lists O-300-A - [STC SE3330NM](https://openairdocs.org/stc/SE3330NM): Continental valve cover gasket. Real Gaskets Tennessee. Lists O-300-A - [STC SE1220GL](https://openairdocs.org/stc/SE1220GL): Replacement of Slick Model 664 magnetos with Slick Model 6264 magnetos or installation of Model 6364 magneto. Champion Aerospace LLC. Lists O-300-A - [STC SE09846SC](https://openairdocs.org/stc/SE09846SC): Installation of S539800M30 starter adapter springs. Aircraft Specialties Services Inc. Lists O-300-D - [STC SE1780NM](https://openairdocs.org/stc/SE1780NM): Installation of Precise Flight standby vacuum system (SVS III). Precise Flight Inc. Lists O-300-A - [STC SE01943CH](https://openairdocs.org/stc/SE01943CH): Add the following approved fuels: unleaded automotive gasoline 87 minimum antiknock index, per ASTM Specification D-439 or D-4814 of any volatility class, A through E, or 82UL AVGAS per ASTM D-6227. Experimental Aircraft Association Inc. Lists O-300-A - [STC SE5743NM](https://openairdocs.org/stc/SE5743NM): Intallation of adapter for externally mounted oil filter. Aviation Development Corporation. Lists O-300-A - [STC ST00435AT](https://openairdocs.org/stc/ST00435AT): Overhaul/repair of the Delco starter adapter drive (P/N 1971890) used with Delco starters P/N's 11096656 and 1109660. Aerotech - [STC SE09513SC](https://openairdocs.org/stc/SE09513SC): Installation and usage of Exxon 20W50 Multigrade aircraft engine oil conforming to Exxon Oil Formulation WS-3013. Exxon Company USA - [STC SE1-201](https://openairdocs.org/stc/SE1-201): Installation of the Richter Aero Equipment Type B-4 or B-5 Temperature Probe. (O-360 SERIES (excl. A1C, C2B, C2D)). MidContinent Instru Co Inc - [STC SE00164SE](https://openairdocs.org/stc/SE00164SE): Installation of Avglas components to modify carburetor air housing assemblies. McFarlane Aviation, Inc - [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector. Aviation Development Corporation. Lists O-300-A - [STC SE00262NY](https://openairdocs.org/stc/SE00262NY): Installation of Canadian Aero Manufacturing Pull Start Clutch, P/N 1971890-N or 1971890-M. Canadian Aero Manufacturing - [STC SE8669SW](https://openairdocs.org/stc/SE8669SW): Installation of roller rocker arm. Performance Engineering. Lists O-300-A - [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp - [STC SE3-663](https://openairdocs.org/stc/SE3-663): Install dry vacuum pump drive. Parker Hannifin Corp. Lists O-300-A - [STC SE1976SW](https://openairdocs.org/stc/SE1976SW): Manufacture of new cylinder barrels and rebarreling with original cylinder head. Gary Aerospace Corp - [STC SE244NE](https://openairdocs.org/stc/SE244NE): Installation of Mattituck plasma flame sprayed cylinder barrels in Teledyne reciprocating engines. Mattituck Airbase, Inc - [STC SE2006CE](https://openairdocs.org/stc/SE2006CE): Add the following approved fuel: unleaded automotive gasoline, 87 minimum index and leaded automotive gasoline, 88 minimum antiknock index (RON+MON)/2. Also intermixing of aviation gasoline. Petersen Aviation Inc. Lists O-300-A - [STC SE1445SO](https://openairdocs.org/stc/SE1445SO): Use of Aero-blend oil additive in Teledyne (non turbocharged) aircraft engines. ProTec - [STC SE12GL](https://openairdocs.org/stc/SE12GL): Installation of oil filler cap. Ray Whyte Electric Products Co. Lists O-300-A - [STC SE44WE](https://openairdocs.org/stc/SE44WE): Use of Kling Aviation Oil, Specifications KL-100, KL-200 and KL-300 in Continental and Lycoming engines. Kling Oil Company ## Related - Other Williams MONOCOUPE 90C aircraft: https://openairdocs.org/model/williams-monocoupe-90c/aircraft.md - The Continental 0-300 series engine: https://openairdocs.org/engine/continental-0-300-series.md --- 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.