# Lycoming O-235-K2C

- Type: Engine model (FAA registry)
- Registry code: 42036
- Manufacturer (registry): LYCOMING
- Model: O-235-K2C
- Engine type: Reciprocating
- Power: 118 hp
- Data sheet: [TCDS E-223](https://openairdocs.org/tcds/E-223) (OpenAirDocs)
- Holder: Lycoming Engines
- Installed in: 13 registered aircraft
- Page: https://openairdocs.org/engine/lycoming-o-235-k2c

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 98-01-06](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 (13)

- [N408JN](https://openairdocs.org/aircraft/N408JN): [Tvpx Ars Inc Trustee](https://openairdocs.org/faa-owner/TVPX%20ARS%20INC%20TRUSTEE), [North Salt Lake, UT](https://openairdocs.org/faa-place/UT/North%20Salt%20Lake), built 1966, S/N 58
- [N541ME](https://openairdocs.org/aircraft/N541ME): built 2007, S/N 1400-2007
- [N633L](https://openairdocs.org/aircraft/N633L): [Longview, TX](https://openairdocs.org/faa-place/TX/Longview), built 2025, S/N 1414-2025, Registration pending
- [N634L](https://openairdocs.org/aircraft/N634L): [Letourneau University](https://openairdocs.org/faa-owner/LETOURNEAU%20UNIVERSITY), [Longview, TX](https://openairdocs.org/faa-place/TX/Longview), built 2025, S/N 1415-2025
- [N710TL](https://openairdocs.org/aircraft/N710TL): [Barker John Van](https://openairdocs.org/faa-owner/BARKER%20JOHN%20VAN), [Smyrna, GA](https://openairdocs.org/faa-place/GA/Smyrna), built 2007, S/N 1398-2007
- [N790L](https://openairdocs.org/aircraft/N790L): [Letourneau University](https://openairdocs.org/faa-owner/LETOURNEAU%20UNIVERSITY), [Longview, TX](https://openairdocs.org/faa-place/TX/Longview), built 2011, S/N 1408-2011
- [N793L](https://openairdocs.org/aircraft/N793L): [Letourneau University](https://openairdocs.org/faa-owner/LETOURNEAU%20UNIVERSITY), [Longview, TX](https://openairdocs.org/faa-place/TX/Longview), built 2014, S/N 1409-2014
- [N795L](https://openairdocs.org/aircraft/N795L): [Letourneau University](https://openairdocs.org/faa-owner/LETOURNEAU%20UNIVERSITY), [Longview, TX](https://openairdocs.org/faa-place/TX/Longview), built 2023, S/N 1413-2023
- [N797L](https://openairdocs.org/aircraft/N797L): [Letourneau University](https://openairdocs.org/faa-owner/LETOURNEAU%20UNIVERSITY), [Longview, TX](https://openairdocs.org/faa-place/TX/Longview), built 2014, S/N 1410-2014
- [N80SD](https://openairdocs.org/aircraft/N80SD): [Lake Area Technical College](https://openairdocs.org/faa-owner/LAKE%20AREA%20TECHNICAL%20COLLEGE), [Watertown, SD](https://openairdocs.org/faa-place/SD/Watertown), built 2005, S/N 1397-2007
- [N822V](https://openairdocs.org/aircraft/N822V): [Affection Above Aviation Inc](https://openairdocs.org/faa-owner/AFFECTION%20ABOVE%20AVIATION%20INC), [Yukon, OK](https://openairdocs.org/faa-place/OK/Yukon), built 1978, S/N 1281-79
- [N946MS](https://openairdocs.org/aircraft/N946MS): [Mt San Antonio College](https://openairdocs.org/faa-owner/MT%20SAN%20ANTONIO%20COLLEGE), [Walnut, CA](https://openairdocs.org/faa-place/CA/Walnut), built 2015, S/N 1411-2015
- [N947KC](https://openairdocs.org/aircraft/N947KC): [Starzyk Kenneth E](https://openairdocs.org/faa-owner/STARZYK%20KENNETH%20E), [Poplar Grove, IL](https://openairdocs.org/faa-place/IL/Poplar%20Grove), built 2018, S/N 1412-2018

## NTSB investigations (2)

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 CEN24LA162](https://openairdocs.org/ntsb/CEN24LA162), Apr 12, 2024: American Champion 7ECA (N793L), Longview, TX, substantial damage. Probable cause: The rudder post’s failure due to corrosion fatigue. Contributing to the accident were the misalignment of the rudder hinge components, which produced mechanical binding and elevated localized stress,…
- [NTSB CEN21LA033](https://openairdocs.org/ntsb/CEN21LA033), Oct 7, 2020: American Champion 7ECA (N790L), Longview, TX, substantial damage. Probable cause: The improper installation of a clevis pin in the rudder system which led to a loss of directional control during landing.

## FAA accident and incident reports (2)

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 20211111022829I](https://openairdocs.org/incident/20211111022829I), Nov 11, 2021: American Champion Aircraft 7ECA (N793L), Longview, TX, Minor damage. Interviewed the CFI and was told by him that the student pilot and CFI were doing touch and goes at the time of the propeller strike. He stated he instructed…
- [Accident 20201007018069A](https://openairdocs.org/incident/20201007018069A), Oct 7, 2020: American Champion Aircraft 7ECA (N790L), Longview, TX, Substantial damage. On scene, the aircraft had already been moved into a hangar. The pilot stated that he had landed the aircraft and as he was rolling out, he tried to apply…

## Service difficulty reports (17)

As reported by operators and repair stations, by the model named in the report.

- [SDR 2026FA0000588](https://openairdocs.org/sdr/2026FA0000588), May 8, 2026: SPRING. BROKEN. THIS BROKEN TAIL WHEEL CENTER SPRING IS PART OF A FIELD APPROVAL FOR INSTALLING THE SCOUT TAIL WHEEL SPRINGS ONTO AN 7ECA. THE REASON BEING THAT THE SCOUT TAIL 
- [SDR 2020FA0000172](https://openairdocs.org/sdr/2020FA0000172), Feb 19, 2020: ARM. WORN. AMERICAN CHAMPION AICRAFT 7ECA CARBURETOR HEAT CONTROL CABLE ATTACHMENT BOLT IS WEARING ON THE CARBURETOR HEAT DOOR ARM TO THE POINT THE BOLT IS ALMOST CUT IN H
- [SDR 2017FA0000459](https://openairdocs.org/sdr/2017FA0000459), Aug 22, 2017: MAGNETO. FAILED. INSTALLED A REBUILT MAGNETO DUE TO REMOVED THE MAGNETO NEEDING A 500 HOUR INSPECTION. AT AFTT 1347.7 (380.8 HOURS) THE REBUILT MAGNETO WAS REMOVED BECAUSE ENGIN
- [SDR 2017FA0000045](https://openairdocs.org/sdr/2017FA0000045), Sep 20, 2016: DISTRIBUTOR. LOOSE. AIRCRAFT WAS LANDED ON MUD FLAT NEAR KPAO. LOWER PLUGS WERE FOUND FILLED UP WITH LEAD. AFTER MORE INSPECTION IT WAS FOUND THAT THE MAGNETO DISTRIBUTOR WHEEL TAB
- [SDR GM8S2015052900249](https://openairdocs.org/sdr/GM8S2015052900249), May 13, 2015: DISTRIBUTOR GEAR. LOOSE. DURING FLIGHT, ACFT HAD AN ENGINE POWER LOSS. DISCOVERED THE MAGNETO TO HAVE A LOOSE DISTRIBUTOR ARM, WHICH CAUSED THE MAGNETO TO FAIL.
- [SDR GM8S2015052900250](https://openairdocs.org/sdr/GM8S2015052900250), May 13, 2015: DISTRIBUTOR GEAR. LOOSE. DURING FLT, ACFT HAD AN ENGINE POWER LOSS. DISCOVERED THE MAGNETO TO HAVE A LOOSE DISTRIBUTOR ARM, WHICH CAUSED THE MAGNETO TO FAIL.
- [SDR CA140818016](https://openairdocs.org/sdr/CA140818016), Aug 12, 2014: CAMSHAFT. WORN. (CAN) LYCOMING FACTORY OVERHAULED ENGINE INSTALLED DEC. 2009. FIRST NOTICED METAL DURING INSPECTION ON MAY 2013 AT ENGINE TIME OF 353.6. IT WAS DETERMINED THAT 
- [SDR CA120510001](https://openairdocs.org/sdr/CA120510001), May 5, 2012: SPRING. BROKEN. (CAN) AFTER LANDING TAILWHEEL SPRING BROKE AND PUNCTURED THE TAIL WHEEL TIRE.
- [SDR CA101104003](https://openairdocs.org/sdr/CA101104003), Oct 21, 2010: PLUG. WORN. (CAN) FOUND ALUMINUM CONTAMINATION IN OIL SCREEN. FOUND NR 1+2 CYLINDER FORWARD SIDE PISTON PIN PLUGS WORN. FOUND THAT THE LOWER PISTON RING ON BOTH PISTONS CRE
- [SDR CA100603001](https://openairdocs.org/sdr/CA100603001), Jun 3, 2010: GASKET. LEAKING. BLUE FUEL STAINS VISIBLE ALONG GASKET LINE ON OUTSIDE OF CARBURETOR AND ALONG GASKET LINE IN AIRFLOW BORE. BOWL SCREWS CHECKED SECURE. SUSPECT POROUS GASKET OR 
- [SDR CA070907003](https://openairdocs.org/sdr/CA070907003), Sep 6, 2007: ATTACH FITTING. FAULTY. (CAN) AD 96-18-02 AND THE AIRWORTHINESS LIMITATIONS FOR THIS AC REQUIRE THAT THE WING SPAR/STRUT ATTACH FITTINGS BE REMOVED AND NDI WITH FLUORESCENT DYE PENETRA
- [SDR CA070516001](https://openairdocs.org/sdr/CA070516001), May 15, 2007: TUBE. BROKEN. (CAN) WHILE PREFLIGHTING THE AC, THE PILOT NOTED WRINKLED FABRIC AT THE LOWER AFT END OF THE FUSELAGE. OPENING THE FABRIC REVEALED THAT THE VERTICAL TUBE THAT F
- [SDR CA060928003](https://openairdocs.org/sdr/CA060928003), Sep 9, 2006: STRINGER. FAILED. (CAN) AFTER RECOVERING FROM AN AEROBATIC MANEUVER, THE PILOT FOUND THAT FULL DOWN ELEVATOR TRAVEL COULD NOT BE OBTAINED. A UNEVENTFUL RETURN TO THE AIRPORT AND 
- [SDR 2004FA0000837](https://openairdocs.org/sdr/2004FA0000837), Sep 16, 2004: FLOAT. DAMAGED. ENGINE STALLED WHILE AIRCRAFT WAS ON FINAL APPROACH. DURING TEST RUN, ENGINE PERFORMED NORMALLY DURING RUN UP CHECK, IDLE CHECK AND MIXTURE CHECK AT 1000 RPM. H
- [SDR CA040817006](https://openairdocs.org/sdr/CA040817006), Aug 16, 2004: ATTACH FITTING. CHAFED. (CAN) THE STRUT ATTACH FITTING ON FORWARD SPAR OF THE RH WING WAS CHAFED BY THE LEADING EDGE SKIN, WHICH HAD NOT BEEN TRIMMED ADEQUATELY DURING MANUFACTURE. THE
- [SDR CA031121003](https://openairdocs.org/sdr/CA031121003), Nov 13, 2003: SPRING. BROKEN. (CAN) BROKEN TAILWHEEL SPRING DISCOVERED DURING GROUND HANDLING. HOOK HAD BROKEN OFF ONE END. BREAK APPEARED TO HAVE STARTED AT BEND WHERE HOOK IS FORMED FROM S
- [SDR CA020322006](https://openairdocs.org/sdr/CA020322006), Mar 7, 2002: CONTROL CABLE. FRAYED. (CAN) DURING ACCEPTANCE INSPECTION BEFORE ADDITION TO FLEET, THE TRIM CABLES WERE FOUND TO BE CHAFING ON THE TOP ELEVATOR CABLE. THESE CABLES RUN IN CLOSE PROXI

## STCs that may be installed (OpenAirDocs) (31)

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 SE790GL](https://openairdocs.org/stc/SE790GL): Superseded by STC SE01943CH. Replace Lycoming piston number LW-13623 with Lycoming piston number 73851. EAA Aviation Foundation
- [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 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 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 SE5945SW](https://openairdocs.org/stc/SE5945SW): Grind mitrided choked engine cylinders .010-inch oversize and install .010-inch oversize pistons and rings. Superior Air Parts
- [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

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