# Lycoming O-235-C2C - Type: Engine model (FAA registry) - Registry code: 42033 - Manufacturer (registry): LYCOMING - Model: O-235-C2C - Engine type: Reciprocating - Power: 115 hp - Data sheet: [TCDS E-223](https://openairdocs.org/tcds/E-223) (OpenAirDocs) - Holder: Lycoming Engines - Installed in: 29 registered aircraft - Page: https://openairdocs.org/engine/lycoming-o-235-c2c Model codes come from the FAA registry's reference file. ## ADs that may apply (OpenAirDocs) Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 2026-17-10](https://openairdocs.org/ad/2026-17-10): Reciprocating Engine Cylinder Section · Lycoming Engines O-235, O-235-A, O-235-AP and 159 more. Effective Sep 14, 2026 - [AD 2026-04-11](https://openairdocs.org/ad/2026-04-11): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 605 more. Effective Apr 8, 2026 - [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012 - [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004 - [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 96-09-10](https://openairdocs.org/ad/96-09-10): Oil pump · Lycoming Engines AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A and 334 more. Effective Jul 15, 1996 - [AD 95-03-10](https://openairdocs.org/ad/95-03-10): Push Rods · Lycoming Engines O-235, O-235-A, O-235-AP and 38 more. Effective Jan 24, 1996 - [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 90-04-06 R1](https://openairdocs.org/ad/90-04-06-R1): Propeller Governor External Oil Line · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 427 more. Effective May 28, 1991 - [AD 81-16-05](https://openairdocs.org/ad/81-16-05): Magnetos · Lycoming Engines AEIO-320-E1B, AEIO-320-E2B, AEIO-360-B1G6 and 234 more. Effective Aug 6, 1981 - [AD 80-25-02 R2](https://openairdocs.org/ad/80-25-02-R2): Pushrods · Lycoming Engines O-235, O-235-A, O-235-AP and 30 more. Effective Jan 13, 1981 - [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 - [AD 75-08-09](https://openairdocs.org/ad/75-08-09): Oil Pump Drive Shaft · Lycoming Engines AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C and 365 more. Effective Aug 18, 1977 - [AD 69-24-03](https://openairdocs.org/ad/69-24-03): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 321 more. Effective Nov 29, 1969 Historical (superseded or no longer in force): - [AD 2024-21-02](https://openairdocs.org/ad/2024-21-02) (historical): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 548 more. Effective Dec 5, 2024 - [AD 81-18-04 R2](https://openairdocs.org/ad/81-18-04-R2) (historical): Engine Oil Pump Driven Impeller and Shaft · Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 376 more. Effective Jun 7, 1982 ## Information bulletins (advisory) (3) - [SAIB NE-19-08](https://openairdocs.org/saib/NE-19-08): Reciprocating Engine Cylinder Section - Lycoming Engines Parallel Valve Cylinders. Issued May 2, 2019 - [SAIB NE-14-13](https://openairdocs.org/saib/NE-14-13): Reciprocating Engine - Cylinder Mounting Studs. Issued Mar 24, 2014 - [SAIB NE-06-32R1](https://openairdocs.org/saib/NE-06-32R1): Reciprocating Engine - Crankshaft. Issued Sep 10, 2008 ## Registered aircraft (29) - [N1224K](https://openairdocs.org/aircraft/N1224K): [Boyer Larry E](https://openairdocs.org/faa-owner/BOYER%20LARRY%20E), [Reading, PA](https://openairdocs.org/faa-place/PA/Reading), built 2017, S/N 6-5838 - [N13375](https://openairdocs.org/aircraft/N13375): [Jenkins John R](https://openairdocs.org/faa-owner/JENKINS%20JOHN%20R), [Springville, AL](https://openairdocs.org/faa-place/AL/Springville), built 2011, S/N 215 - [N15BJ](https://openairdocs.org/aircraft/N15BJ): [Tumino Michele R](https://openairdocs.org/faa-owner/TUMINO%20MICHELE%20R), [Tyler, TX](https://openairdocs.org/faa-place/TX/Tyler), S/N 6-6266 - [N1627](https://openairdocs.org/aircraft/N1627): [Johns Trevor M](https://openairdocs.org/faa-owner/JOHNS%20TREVOR%20M), [Seattle, WA](https://openairdocs.org/faa-place/WA/Seattle), built 2015, S/N 0021 - [N194B](https://openairdocs.org/aircraft/N194B): [Jordan Allen D](https://openairdocs.org/faa-owner/JORDAN%20ALLEN%20D), [Choudrant, LA](https://openairdocs.org/faa-place/LA/Choudrant), built 2018, S/N 0022 - [N235EC](https://openairdocs.org/aircraft/N235EC): [Moore Dylan D](https://openairdocs.org/faa-owner/MOORE%20DYLAN%20D), [Lakeville, MA](https://openairdocs.org/faa-place/MA/Lakeville), built 2011, S/N 1001 - [N258DM](https://openairdocs.org/aircraft/N258DM): [Mellen Dale](https://openairdocs.org/faa-owner/MELLEN%20DALE), [Marysville, OH](https://openairdocs.org/faa-place/OH/Marysville), built 2022, S/N 258 - [N3131C](https://openairdocs.org/aircraft/N3131C): [Bell Anthony Scott](https://openairdocs.org/faa-owner/BELL%20ANTHONY%20SCOTT), [Garland, TX](https://openairdocs.org/faa-place/TX/Garland), built 2008, S/N 6-5847 - [N317WS](https://openairdocs.org/aircraft/N317WS): [Wood Steven J](https://openairdocs.org/faa-owner/WOOD%20STEVEN%20J), [Rock Hill, MO](https://openairdocs.org/faa-place/MO/Rock%20Hill), built 2019, S/N 1871 - [N339EZ](https://openairdocs.org/aircraft/N339EZ): [Pico Andres V](https://openairdocs.org/faa-owner/PICO%20ANDRES%20V), [Hollywood, MD](https://openairdocs.org/faa-place/MD/Hollywood), S/N 1339 - [N3473](https://openairdocs.org/aircraft/N3473): [Richmond Randy W](https://openairdocs.org/faa-owner/RICHMOND%20RANDY%20W), [Roanoke, TX](https://openairdocs.org/faa-place/TX/Roanoke), built 2022, S/N 001 - [N3571V](https://openairdocs.org/aircraft/N3571V): [Lutz Paul A](https://openairdocs.org/faa-owner/LUTZ%20PAUL%20A), [Seville, OH](https://openairdocs.org/faa-place/OH/Seville), built 2026, S/N 05210100 - [N364DC](https://openairdocs.org/aircraft/N364DC): [Clowes Delbert](https://openairdocs.org/faa-owner/CLOWES%20DELBERT), [Shafter, CA](https://openairdocs.org/faa-place/CA/Shafter), built 2014, S/N 75-7639-001 - [N45VE](https://openairdocs.org/aircraft/N45VE): [Baron John B](https://openairdocs.org/faa-owner/BARON%20JOHN%20B), [Mesa, AZ](https://openairdocs.org/faa-place/AZ/Mesa), S/N 1485 - [N489BB](https://openairdocs.org/aircraft/N489BB): [Boatman John H Jr](https://openairdocs.org/faa-owner/BOATMAN%20JOHN%20H%20JR), [Smyrna, TN](https://openairdocs.org/faa-place/TN/Smyrna), S/N JB001 - [N651TP](https://openairdocs.org/aircraft/N651TP): [Gray Dylan](https://openairdocs.org/faa-owner/GRAY%20DYLAN), [Alliance, OH](https://openairdocs.org/faa-place/OH/Alliance), built 2011, S/N 65-7575 - [N669PM](https://openairdocs.org/aircraft/N669PM): [Kohl Rex](https://openairdocs.org/faa-owner/KOHL%20REX), [Eden Prairie, MN](https://openairdocs.org/faa-place/MN/Eden%20Prairie), built 2015, S/N 1161 - [N6900](https://openairdocs.org/aircraft/N6900): [Adams Paul T](https://openairdocs.org/faa-owner/ADAMS%20PAUL%20T), [Pompano Beach, FL](https://openairdocs.org/faa-place/FL/Pompano%20Beach), built 2023, S/N 17-A - [N731TD](https://openairdocs.org/aircraft/N731TD): [Johnson Thomas R](https://openairdocs.org/faa-owner/JOHNSON%20THOMAS%20R), [Lancaster, OH](https://openairdocs.org/faa-place/OH/Lancaster), built 2014, S/N 65-8634 - [N748WH](https://openairdocs.org/aircraft/N748WH): [Huete Charles W](https://openairdocs.org/faa-owner/HUETE%20CHARLES%20W), [Carriere, MS](https://openairdocs.org/faa-place/MS/Carriere), built 1969, S/N AA1-0297 - [N80KJ](https://openairdocs.org/aircraft/N80KJ): [Albert Lea Airport Inc](https://openairdocs.org/faa-owner/ALBERT%20LEA%20AIRPORT%20INC), [Albert Lea, MN](https://openairdocs.org/faa-place/MN/Albert%20Lea), built 2010, S/N 75-7602 - [N837TH](https://openairdocs.org/aircraft/N837TH): [Hager Bill](https://openairdocs.org/faa-owner/HAGER%20BILL), [Parma, ID](https://openairdocs.org/faa-place/ID/Parma), built 2007, S/N 873 - [N866BR](https://openairdocs.org/aircraft/N866BR): [Boatright Leslie J](https://openairdocs.org/faa-owner/BOATRIGHT%20LESLIE%20J), [Titusville, FL](https://openairdocs.org/faa-place/FL/Titusville), built 2017, S/N 083 - [N905RS](https://openairdocs.org/aircraft/N905RS): [Seman Richard M](https://openairdocs.org/faa-owner/SEMAN%20RICHARD%20M), [Pittsburgh, PA](https://openairdocs.org/faa-place/PA/Pittsburgh), built 2011, S/N 001 - [N9300L](https://openairdocs.org/aircraft/N9300L): [Wesley Robert J](https://openairdocs.org/faa-owner/WESLEY%20ROBERT%20J), [Chuckey, TN](https://openairdocs.org/faa-place/TN/Chuckey), built 1971, S/N AA1A-0200 - [N933BP](https://openairdocs.org/aircraft/N933BP): [Marr Steven K](https://openairdocs.org/faa-owner/MARR%20STEVEN%20K), [Saint Charles, MO](https://openairdocs.org/faa-place/MO/Saint%20Charles), S/N 1585 - [N9485L](https://openairdocs.org/aircraft/N9485L): [Roll George N](https://openairdocs.org/faa-owner/ROLL%20GEORGE%20N), [Freeport, FL](https://openairdocs.org/faa-place/FL/Freeport), built 1971, S/N AA1A-0285 - [N95BT](https://openairdocs.org/aircraft/N95BT): [Campbell Allen B](https://openairdocs.org/faa-owner/CAMPBELL%20ALLEN%20B), [Meggett, SC](https://openairdocs.org/faa-place/SC/Meggett), built 2010, S/N M1A2221 - [N991SW](https://openairdocs.org/aircraft/N991SW): [Leston Peter M](https://openairdocs.org/faa-owner/LESTON%20PETER%20M), [Mansfield, MA](https://openairdocs.org/faa-place/MA/Mansfield), built 2024, S/N 65-10173 ## NTSB investigations (3) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB CEN17LA313](https://openairdocs.org/ntsb/CEN17LA313), Jul 20, 2017: Canion Michael W Zodiac 601XL (N577M), Grady, AR, substantial damage. Probable cause: The loss of engine power due to a lack of ignition resulting from a broken alternator wire. - [NTSB CEN09LA385](https://openairdocs.org/ntsb/CEN09LA385), Jun 25, 2009: Schendl Mustang II (N152AS), West Union, OH, substantial damage, 1 fatal. Probable cause: The pilot's failure to maintain adequate airspeed after a loss of engine power for undetermined reasons, which resulted in an aerodynamic stall/spin at a low altitude. - [NTSB DFW07LA144](https://openairdocs.org/ntsb/DFW07LA144), Jun 18, 2007: Frew Zodiac 601XL (N20370), Oxford, MS, substantial damage. Probable cause: The loss of engine power for undetermined reasons. ## FAA accident and incident reports (6) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Incident 20260204002809I](https://openairdocs.org/incident/20260204002809I), Feb 4, 2026: Wodack Aj POBER SUPER ACE (N6900), Pompano Beach, FL, Minor damage. Part 91 phase I experimental test flight. During take off - departure roll, a variable gust caused the aircraft's tail to weathervane to the right, resulting… - [Incident 20201121014969I](https://openairdocs.org/incident/20201121014969I), Nov 21, 2020: American Aviation AA-1A (N9485L), Holt, FL, Minor damage. Pilot landed too fast on an unfamiliar grass runway resulting in a hard landing. As the pilot began to slow the aircraft down, it began to slide on the grass… - [Accident 20170720009979A](https://openairdocs.org/incident/20170720009979A), Jul 20, 2017: Canion Michael W ZODIAC 601XL (N577M), Grady, AR, Substantial damage. On July 20, 2017, at approximately 1500 CDT, a zodiac 601 xl, registered as N577M, landed in a corn field near Grady, AR due to complete electrical… - [Accident 20140916016809A](https://openairdocs.org/incident/20140916016809A), Sep 16, 2014: Randall Murray RANDALL CUB (N235EC), Berkley, MA, Substantial damage. Pilot veered to the left while taking off. Aircraft hit trees at the edge of runway. Firewall damage. Pilot transported to hospital with minor injuries. - [Accident 20090624011139A](https://openairdocs.org/incident/20090624011139A), Jun 24, 2009: Amtr MUSTANGII (N152AS), West Union, OH, Destroyed, 1 fatal. (-23) On June 24, 2009 at approximately 2030 local (EDT), Mr. Anthony schendl was fatally injured when he crashed his mustang ii. June 25, 2009 the crash site… - [Incident 20080929848739I](https://openairdocs.org/incident/20080929848739I), Sep 29, 2008: Monroe VARIEZE (N45VE), Phoenix, AZ, Minor damage. (-23)Experimental aircraft landed and nose wheel came off the aircraft. There was minor damage. The shimmy damper as found to be defective. Aircraft was… ## Service difficulty reports (9) As reported by operators and repair stations, by the model named in the report. - [SDR CA140318009](https://openairdocs.org/sdr/CA140318009), Mar 10, 2014: BRACKET. CORRODED. (CAN) DURING ANNUAL INSPECTION CORROSION WAS SEEN ON OUTER TOP OF RT LANDING GEAR BRACKET. UPON MORE DETAILED INSPECTION WITH LIGHT AND MIRROR INSIDE RADIUS AND - [SDR 2007FA0000555](https://openairdocs.org/sdr/2007FA0000555), Jun 16, 2007: EXHAUST VALVE. BENT. EXHAUST VALVE WAS FOUND STUCK IN THE OPEN POSITION ON TEARDOWN OF THE ENGINE. VALVE STEM HAD A SLIGHT BEND. ENGINE TEARDOWN WAS DUE TO AN AIRCRAFT ACCIDENT. - [SDR 2004FA0000178](https://openairdocs.org/sdr/2004FA0000178), Jan 9, 2004: SEAL. WORN. FOUND CRANKSHAFT SEAL PUSHED FREE FROM ITS MOUNTING AREA. SEAL APPEARED DRY ROTTED AND INSTALLED WITH INSUFFICIENT SEALANT. INSTALLED NEW SEAS IAW SRM. INSPECTE - [SDR CA020726019](https://openairdocs.org/sdr/CA020726019), Jul 3, 2002: BUTTERFLY VALVE. SEPARATED. (CAN) THE SEAL FOR THE BUTTERFLY VALVE IN THE CARBURETOR AIR BOX (FOR CARBURETOR HEAT) SEPARATED AND WAS SUCKED UP INTO THE CARBURETOR. THIS CAUSED THE ENGINE T - [SDR 2001FA0000401](https://openairdocs.org/sdr/2001FA0000401), Jun 18, 2001: GEAR. WORN. REMOVE VACUUM PUMP DRIVE SHAFT GEAR, OIL LEAKING INTO VACUUM PUMP, WORN SPOT ON SHAFT DAMAGED OIL SEAL CAUSING OIL LEAK. - [SDR 20000920SH011](https://openairdocs.org/sdr/20000920SH011), Jun 3, 2000: GASKET. LEAKING. REPLACED VAC/PUMP OIL SEAL STD-208 AND GASKET SL-61183 (2 TIMES SL-61183). OIL WOULD LEAK OUT IN GREAT AMOUNT. SEAL/GASKET DOES NOT HOLD OIL PRESSURE. THE ALUM/ - [SDR 98ZZZX1518](https://openairdocs.org/sdr/98ZZZX1518), Mar 1, 1998: OIL PUMP. WRONG GEARS. ANNUAL INSPECTION RECORD CHECK FOUND AD 75-08-09 C/W NOV 1976. REPLACED GEARS 6-7-78. ENGINE OVERHAULED, NO DETAILS GIVEN. 6-30-79 - ENGINE REMOVED AND STORED. - [SDR 95ZZZX6760](https://openairdocs.org/sdr/95ZZZX6760), Nov 17, 1995: CARBURETOR. FAILED. ENGINE QUIT IN CRUISE FLIGHT. SMALL PARTICLES OF DIRT FOUND IN CARBURETOR PER OVERHAUL SHOP. - [SDR 95ZZZX414](https://openairdocs.org/sdr/95ZZZX414), Jan 2, 1995: CYLINDER. SEPARATION. AIRCRAFT ENGINE, WHILE IN-FLIGHT, SUFFERED BARREL-TO-HEAD SEPARATION. SUSPECT CAUSE SEVERE METAL FATIGUE FROM WELDING MULTIPLE TIMES AND POSSIBLE IMPROPER WELDI ## STCs that may be installed (OpenAirDocs) (32) Approved for this engine model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has. - [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 - [STC SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines. B & C Specialty Products Inc - [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. Lists O-235 Series - [STC SE208SO](https://openairdocs.org/stc/SE208SO): Installation of ice indicator in the carburetor. LegacySTC.com. Lists O-235 Series - [STC SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd - [STC SE02352CH](https://openairdocs.org/stc/SE02352CH): Installation of Challenger cleanable oil filter assembly. Challenger Aviation Products Inc - [STC SE00939WI](https://openairdocs.org/stc/SE00939WI): Installation of B&C Specialty Products Model BC 315-( ) Starter on Lycoming engines. B & C Specialty Products Inc - [STC SE2393CE](https://openairdocs.org/stc/SE2393CE): Installation of B&C Speciality Products lightweight (10.2 pounds) engine starter, part number BC-315-100-1 (12 volts) or part number BC-315-100-3 (24 volts). B & C Specialty Products Inc. Lists O-235 Series - [STC SE03232CH](https://openairdocs.org/stc/SE03232CH): Installation of Engine Preheat Kit p/n TA2925-1 for 115 volt application. Hartzell Propeller Inc - [STC SE04577CH](https://openairdocs.org/stc/SE04577CH): Install an electronic engine ignition system. Electroair Acquisition Corp - [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 - [STC SE8628SW](https://openairdocs.org/stc/SE8628SW): Installation of oil nozzles for lubrication of cam and filters. Cygnet Aerospace Corp - [STC SE00218NY](https://openairdocs.org/stc/SE00218NY): Replacement of Lycoming starter with SKY-TEC 12 volt starter installed. Hartzell Engine Technologies, LLC. Lists O-235 Series - [STC SE00226NY](https://openairdocs.org/stc/SE00226NY): Replacement of Lycoming starter with SKY-TEC 24-volt starter Models 149-24HT and 122-24HT. Approval limited to 24-volt DC source available to the starter. Hartzell Engine Technologies, LLC - [STC SE00357NY](https://openairdocs.org/stc/SE00357NY): Replacement of Lycoming starter with SKY-TEC 24-volt starter installed. Hartzell Engine Technologies, LLC. Lists O-235 Series - [STC SE8707SW](https://openairdocs.org/stc/SE8707SW): Alteration of Lycoming O-235 engine to allow use of ethanol fuel. Shauck Dr Maxwell E Jr - [STC SE01930NY](https://openairdocs.org/stc/SE01930NY): Installation of Casper Labs 90 degree oil filter housing adapter. Casper Labs Inc - [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 - [STC SE1779NM](https://openairdocs.org/stc/SE1779NM): Installation of Precise Flight, Inc. Standby Vacuum System SVS III. Precise Flight Inc - [STC SE5743NM](https://openairdocs.org/stc/SE5743NM): Intallation of adapter for externally mounted oil filter. Aviation Development Corporation - [STC SE00988CH](https://openairdocs.org/stc/SE00988CH): Modify Lycoming aircraft engine Model O-235-C2C rated at maximum continuous 108 hp at 2600 rpm and 6.75:1 compression ratio to maximum continuous 115 at 2700 rpm and 8.5:1 compression ratio. Precision Engine - [STC SE09492SC](https://openairdocs.org/stc/SE09492SC): Installation and usage of Exxon 20W50 multigrade aircraft engine oil conforming to Exxon Oil formulation WS-3013. Exxon Company USA. Lists O-235 Series - [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector. Aviation Development Corporation - [STC SE8023SW](https://openairdocs.org/stc/SE8023SW): Installation and usage of AEROSHELL. Shell Development Co. Lists O-235 Series - [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp. Lists O-235 Series - [STC SE2035CE](https://openairdocs.org/stc/SE2035CE): Add the following approved fuel: unleaded automotive gasoline, 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index (RON+MON)/2. Intermixing with aviation gasoline also approved. Petersen Aviation Inc - [STC SE5879SW](https://openairdocs.org/stc/SE5879SW): Use of Phillips X/C II 20W-50 and25W-60 oil (OSS 55875) in all Avco reciprocating aircraft engines from 65 to 450 BHP. Phillips Petroleum Co. Lists O-235 Series - [STC SE5924SW](https://openairdocs.org/stc/SE5924SW): Installation of stainless steel replacement exhaust studs on AVCO engines. Perrigo & Steele Aircraft Engr Company. Lists O-235 Series - [STC SE1976SW](https://openairdocs.org/stc/SE1976SW): Manufacture of new cylinder barrels and rebarreling with original cylinder head. Gary Aerospace Corp. Lists O-235 Series - [STC SE5791SW](https://openairdocs.org/stc/SE5791SW): Installation of any or all engine components parts or modifications on Avco 0-235 series engines. Airmotive Engineering Corp. Lists O-235 Series - [STC SE1445SO](https://openairdocs.org/stc/SE1445SO): Use of Aero-blend oil additive in Teledyne (non turbocharged) aircraft engines. ProTec. Lists O-235 Series - [STC SE128NE](https://openairdocs.org/stc/SE128NE): Use of AMS/OIL 15W 50 synthetic piston aircraft oil in Avco engines. AMS/OIL. Lists O-235 Series --- 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.