# Lycoming O235N2C

- Type: Engine model (FAA registry)
- Registry code: 42166
- Manufacturer (registry): LYCOMING
- Model: O235N2C
- Engine type: 4 cycle
- Power: 120 hp
- Data sheet: [TCDS E-223](https://openairdocs.org/tcds/E-223) (OpenAirDocs)
- Holder: Lycoming Engines
- Installed in: 18 registered aircraft
- Page: https://openairdocs.org/engine/lycoming-o235n2c

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 2017-16-11](https://openairdocs.org/ad/2017-16-11): Reciprocating Engine Power Section · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-360-B1G6 and 93 more. Effective Aug 15, 2017
- [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 88-02-04](https://openairdocs.org/ad/88-02-04): Carburetors · Lycoming Engines O-235-C1C, O-235-H2C, O-235-L2A and 4 more. Effective Feb 1, 1988
- [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 (18)

- [N152BU](https://openairdocs.org/aircraft/N152BU): [Green Airport Development Corp](https://openairdocs.org/faa-owner/GREEN%20AIRPORT%20DEVELOPMENT%20CORP), [Kemah, TX](https://openairdocs.org/faa-place/TX/Kemah), built 1983, S/N 15285698
- [N1899A](https://openairdocs.org/aircraft/N1899A): [Nitzel Theodore J](https://openairdocs.org/faa-owner/NITZEL%20THEODORE%20J), [Calumet, OK](https://openairdocs.org/faa-place/OK/Calumet), built 2018, S/N 75-8570
- [N314MZ](https://openairdocs.org/aircraft/N314MZ): [Zemsta Mike](https://openairdocs.org/faa-owner/ZEMSTA%20MIKE), [New Britain, CT](https://openairdocs.org/faa-place/CT/New%20Britain), built 2019, S/N 90454
- [N335RK](https://openairdocs.org/aircraft/N335RK): [Gallant David A](https://openairdocs.org/faa-owner/GALLANT%20DAVID%20A), [Hartsel, CO](https://openairdocs.org/faa-place/CO/Hartsel), built 2013, S/N 001
- [N4810W](https://openairdocs.org/aircraft/N4810W): [Wright Frank W](https://openairdocs.org/faa-owner/WRIGHT%20FRANK%20W), [Quitman, AR](https://openairdocs.org/faa-place/AR/Quitman), built 2024, S/N S9912-003
- [N526GH](https://openairdocs.org/aircraft/N526GH): [Czajkowski Matthew A](https://openairdocs.org/faa-owner/CZAJKOWSKI%20MATTHEW%20A), [Garfield, NJ](https://openairdocs.org/faa-place/NJ/Garfield), built 2012, S/N 6-4380
- [N5400U](https://openairdocs.org/aircraft/N5400U): [Ragozzino John C](https://openairdocs.org/faa-owner/RAGOZZINO%20JOHN%20C), [Fountain Hills, AZ](https://openairdocs.org/faa-place/AZ/Fountain%20Hills), built 2019, S/N 90527
- [N601TM](https://openairdocs.org/aircraft/N601TM): [Mims Edwin T](https://openairdocs.org/faa-owner/MIMS%20EDWIN%20T), [Murphy, NC](https://openairdocs.org/faa-place/NC/Murphy), built 2008, S/N 6-5545
- [N605PF](https://openairdocs.org/aircraft/N605PF): [Baez Asael](https://openairdocs.org/faa-owner/BAEZ%20ASAEL), [Shillington, PA](https://openairdocs.org/faa-place/PA/Shillington), built 2004, S/N 20-1035
- [N668AM](https://openairdocs.org/aircraft/N668AM): [Center Line Aviation Limited](https://openairdocs.org/faa-owner/CENTER%20LINE%20AVIATION%20LIMITED), [Brookville, PA](https://openairdocs.org/faa-place/PA/Brookville), built 2002, S/N 20-1008
- [N750DA](https://openairdocs.org/aircraft/N750DA): [Parkhill Lawrence](https://openairdocs.org/faa-owner/PARKHILL%20LAWRENCE), [Ojai, CA](https://openairdocs.org/faa-place/CA/Ojai), S/N C75-10166
- [N823JR](https://openairdocs.org/aircraft/N823JR): [Jud Robert W](https://openairdocs.org/faa-owner/JUD%20ROBERT%20W), [Holly, MI](https://openairdocs.org/faa-place/MI/Holly), built 2007, S/N 64928
- [N902AL](https://openairdocs.org/aircraft/N902AL): [By Tor Aviation LLC](https://openairdocs.org/faa-owner/BY%20TOR%20AVIATION%20LLC), [Phoenix, AZ](https://openairdocs.org/faa-place/AZ/Phoenix), built 2014, S/N 65-7478
- [N94194](https://openairdocs.org/aircraft/N94194): [Power Flow Systems Inc](https://openairdocs.org/faa-owner/POWER%20FLOW%20SYSTEMS%20INC), [Daytona Beach, FL](https://openairdocs.org/faa-place/FL/Daytona%20Beach), built 1982, S/N 15285618
- [N94500](https://openairdocs.org/aircraft/N94500): [Training Planes LLC](https://openairdocs.org/faa-owner/TRAINING%20PLANES%20LLC), [Tampa, FL](https://openairdocs.org/faa-place/FL/Tampa), built 1983, S/N 15285692
- [N95391](https://openairdocs.org/aircraft/N95391): [Training Planes LLC](https://openairdocs.org/faa-owner/TRAINING%20PLANES%20LLC), [Tampa, FL](https://openairdocs.org/faa-place/FL/Tampa), built 1984, S/N 15285881
- [N956JK](https://openairdocs.org/aircraft/N956JK): [Krips Jack E Jr](https://openairdocs.org/faa-owner/KRIPS%20JACK%20E%20JR), [Winter Park, FL](https://openairdocs.org/faa-place/FL/Winter%20Park), built 2014, S/N 1403
- [N988RL](https://openairdocs.org/aircraft/N988RL): [Hot Springs, AR](https://openairdocs.org/faa-place/AR/Hot%20Springs), S/N RL1227-10-0009, Registration pending

## NTSB investigations (5)

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 WPR17FA128](https://openairdocs.org/ntsb/WPR17FA128), Jun 17, 2017: Prescot E. Wilkie RV-3 (N177TT), Payette, ID, destroyed, 1 fatal. Probable cause: The in-flight failure of the left wing due to the owner's use of improper hardware and his improper assembly of the airplane, which reduced the strength of the left wing and resulted in its…
- [NTSB CEN12CA277](https://openairdocs.org/ntsb/CEN12CA277), May 1, 2012: Cessna 152 (N94500), San Antonio, TX, substantial damage. Probable cause: The student pilot's misjudgment of the landing flare, which resulted in a hard/bounced landing and subsequent impact with the runway.
- [NTSB CEN11LA542](https://openairdocs.org/ntsb/CEN11LA542), Aug 1, 2011: T&T Falcon LS (N785TT), Lee's Summit, MO, substantial damage. Probable cause: A binding condition in the left rudder cable which resulted in a loss of directional control during landing.
- [NTSB ATL94LA167](https://openairdocs.org/ntsb/ATL94LA167), Aug 27, 1994: Cessna 152 (N94194), W. Columbia, SC, substantial damage. Probable cause: THE STUDENT PILOT'S FAILURE TO PROPERLY FLARE THE AIRCRAFT, RESULTING IN A HARD LANDING.
- [NTSB CHI84LA019](https://openairdocs.org/ntsb/CHI84LA019), Oct 10, 1983: Cessna 152 (N94500), Elyria, OH, substantial damage

## FAA accident and incident reports (8)

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.

- [Accident 20170617007999A](https://openairdocs.org/incident/20170617007999A), Jun 17, 2017: Wilkie Prescott E RV-3 (N177TT), Payette, ID, Destroyed, 1 fatal. This was is an amateur built aircraft that was built by the pilot. The aircraft received the experimental amateur built special airworthiness certificate…
- [Accident 20120501009919A](https://openairdocs.org/incident/20120501009919A), May 1, 2012: Cessna 152 (N94500), San Antonio, TX, Substantial damage. Pilot flaired high and failed to go round or soften the touchdown.
- [Accident 20110731017569A](https://openairdocs.org/incident/20110731017569A), Jul 31, 2011: T&T Aviation Inc FALCON LS (N785TT), Lee'S Summit, MO, Substantial damage. The pilot was unable to maintain runway heading while rolling out on runway 18. The aircraft departed the runway to the left, struck runway edge lights and…
- [Incident 20081231854759I](https://openairdocs.org/incident/20081231854759I), Dec 31, 2008: Zinair CH2000 (N605PF), Dubuque, IA, Minor damage. (-23) During student pilot touch and go landing operation the nose gear failed resulting in a prop strike and sudden engine stoppage.
- [Incident 20070919019739I](https://openairdocs.org/incident/20070919019739I), Sep 19, 2007: Zinair CH2000 (N605PF), Dubuque, IA, Minor damage. (-23) Student pilot was performing a touch and go landing on runway 31. After touchdown, the aircraft rolled about 100 feet when it began to wobble and pull to…
- [Accident 19940827023949A](https://openairdocs.org/incident/19940827023949A), Aug 27, 1994: Cessna 152 (N94194), Columbia, SC, Substantial damage. Student made hard landing. Collapsed nose gear and bent airframe.
- [Accident 19831010054199A](https://openairdocs.org/incident/19831010054199A), Oct 10, 1983: Cessna 152 (N94500), Elyria, OH, Substantial damage. Bounced on landing. Came down hard on nose wheel. Impact damaged nose gear prop, motor mounts and firewall.
- [Incident 19830306013149I](https://openairdocs.org/incident/19830306013149I), Mar 6, 1983: Cessna 152 (N94194), Fairbanks, AK, Minor damage. Too low on final. Aircraft touched snow 1000 feet short of runway and flipped over.

## Service difficulty reports (55, newest 50)

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

- [SDR 8HBR20260215075](https://openairdocs.org/sdr/8HBR20260215075), Jan 28, 2026: IGNITION LEAD. DAMAGED. A BAD MAGNETO DROP WAS EXPERIENCED DURING THE GROUND RUN OF THE AIRCRAFT. UPON INSPECTION IT WAS FOUND THAT THE RH IGNITION HARNESS LOWER #3 LEAD WAS DEAD.
- [SDR 2023FA0000567](https://openairdocs.org/sdr/2023FA0000567), Sep 12, 2023: UNKNOWN. UNKNOWN. DURING CESSNA 152 AIRCRAFT SCHEDULED MAINTENANCE TECHNICIAN FOUND THAT THREE OF THE FOUR SCREWS BETWEEN STARTER AND ELECTRIC MOTOR WERE LOST. PHOTOS OF STARTER 
- [SDR CA190114008](https://openairdocs.org/sdr/CA190114008), Jan 12, 2019: PISTON. DAMAGED. (CAN) PILOT & INSTRUCTOR COMPLETED RUN UP. TAXIED TO RUNWAY AND STARTED TAKE OFF. AT ABOUT 400 FT ENGINE STARTED TO RUN ROUGH. INSTRUCTOR TRIED CARB HEAT THINKI
- [SDR GGUS2013FA0000518](https://openairdocs.org/sdr/GGUS2013FA0000518), Sep 20, 2013: MAGNETO. DEFECTIVE. DURING MAG CHECK, AT PREFLIGHT RUN UP. FOUND CONTACTS INTERMITTENT WHEN TIMING LIGHT USED TO CONFIRM TIMING, REMOVED AND OPENED MAG FOR INSPECTION. FOUND BEARIN
- [SDR CA131010009](https://openairdocs.org/sdr/CA131010009), Sep 18, 2013: BUTTON. BROKEN. (CAN) UPON 200HR ROCKER ASSY INSPECTION, DISCOVERED ROCKER PIN THRUST BUTTONS BROKEN.
- [SDR 2013FA0000477](https://openairdocs.org/sdr/2013FA0000477), Aug 22, 2013: STRUT. CRACKED. FOUND CRACK ON THE NOSE STRUT PLATE WHERE THE FRONT BOLTS ATTACH TO THE NOSE WHEEL FORK. IT WAS DETECTED 40 HRS AFTER THE LAST INSPECTION.
- [SDR 2012FA0000255](https://openairdocs.org/sdr/2012FA0000255), Apr 29, 2012: OIL COOLER. CRACKED. PILOT REPORTED ODOR OF BURNED ELECTRICAL WIRING FOLLOWED BY ENGINE OIL ENTERING CABIN AT FOOT PEDAL AREA, LOSS OF ENGINE OIL PRESSURE INDICATED. EMERGENCY LANDI
- [SDR 2012FA0000012](https://openairdocs.org/sdr/2012FA0000012), Jan 6, 2012: ROTOR. LOOSE. FOUND DURING A 500HR MAG AND IMPULSE COUPLING INSPECTION, A DEFECTIVE DISTRIBUTOR GEAR FINGER. THIS FINGER HAD WORKED LOOSE FROM ITS PLASTIC SEAT ALLOWING SOME 
- [SDR ZB0R201000003](https://openairdocs.org/sdr/ZB0R201000003), Jun 16, 2010: STARTER. BURNED OUT. DURING ENGINE START, PILOT NOTICED STARTER WOULD NOT ENGAGE FLYWHEEL. ACFT REPORTED TO MX WHERE IT WAS DISCOVERED THE STARTER MOTOR WAS INOPERATIVE. STARTER WAS
- [SDR CA100528010](https://openairdocs.org/sdr/CA100528010), May 18, 2010: ACTUATOR. MALFUNCTIONED. (CAN) ON A WALKAROUND, IT WAS DISCOVERED THAT THE WING FLAPS WERE EXTENDING VERY SLOWLY WITH AN AUDIBLE GRINDING NOISE. UPON INSP, IT WAS FOUND THAT THE FLAP AC
- [SDR CA091005007](https://openairdocs.org/sdr/CA091005007), Aug 14, 2009: MAGNETO. INOPERATIVE. (CAN) ENGINE RUNNING ROUGH. RT MAG FOUND TO BE THE CAUSE. BOTH MAGS REPLACED WITH REPAIRED UNITS. ACFT GROUND RUN AND TESTED OK.
- [SDR CA091005006](https://openairdocs.org/sdr/CA091005006), Aug 11, 2009: ENGINE. CRACKED. (CAN) UPON INSP, MECHANIC DISCOVERED OIL LEAKING FROM BACK OF ENG. NEW BASE ASSY INSTALLED ACFT GROUND RUN AND LEAK CHECK OK.
- [SDR CA081106003](https://openairdocs.org/sdr/CA081106003), Oct 30, 2008: CASE. CRACKED. (CAN) DURING SCHEDULED MAINT (OIL CHANGE) OIL WAS DISCOVERED LEAKING FROM THE UPPER ENGINE CRANK CASE. FUTHER INSP CONFIRMED A CRACK 3 INCHES LONG BETWEEN CYLIN
- [SDR 2007FA0000027](https://openairdocs.org/sdr/2007FA0000027), Dec 4, 2006: PISTON. INOPERATIVE. NR 3 CYLINDER PISTON DOES NOT MOVE IN CYLINDER WHEN YOU TURN PROPELLER. (K)
- [SDR 2006FA0001234](https://openairdocs.org/sdr/2006FA0001234), Dec 2, 2006: PISTON. STUCK. ENGINE QUIT IN FLIGHT, FOUND NR 3 CYLINDER PISTON NOT MOVING IN CYLINDER WHEN TURNING PROP. (K)
- [SDR 2006FA0000871](https://openairdocs.org/sdr/2006FA0000871), Aug 19, 2006: FLOAT. LEAKING. AIRCRAFT NOTED AS HAVING FUEL DRIPPING FROM BOTTOM COWL, FOUND CAR LEAKING FUEL WHILE SITTING STATIC, REMOVED AND CHECKED CARBURETOR. DETERMINED (1) OF THE (2) 
- [SDR 2005FA0001551](https://openairdocs.org/sdr/2005FA0001551), Sep 8, 2005: CARBURETOR. FAILED. PILOT REPORTED PARTIAL LOSS OF POWER. EXECUTED PRECAUTIONARY OFF FIELD LANDING. NO DAMAGE TO AIRCRAFT. TEARDOWN OF CARBURETOR REVEALED METAL SHAVINGS IN ACCELER
- [SDR CA050607005](https://openairdocs.org/sdr/CA050607005), Jun 7, 2005: SPAR. CRACKED. (CAN) WAS REPLACING RT ELEVATOR SKIN DUE TO HINGE WEAR (OB HINGE POINT IS PART OF SKIN). CRACKS WERE FOUND ON THE SPAR P/N 0432001-21 UNDER IB HINGE BRACKET P/N
- [SDR 2005FA0000539](https://openairdocs.org/sdr/2005FA0000539), Apr 11, 2005: FLOAT. CHAFED. ENGINE QUIT IN FLIGHT, PERFORMED AN EMERGENCY LANDING IN A PARKING LOT. EXITING AIRCRAFT FUEL WAS FOUND RUNNING OUT OF COWL, SHUTOFF FUEL SELECTOR, FUEL STOPPED
- [SDR 2004FA0000694](https://openairdocs.org/sdr/2004FA0000694), Aug 31, 2004: OIL COOLER. CRACKED. AIRCRAFT 10 MILES FROM AIRPORT, TRAINING FLIGHT, PRACTICING FLIGHT MANEUVERS. SMELLED SOMETHING WRONG, SCANNED ENGINE GAUGES. NO OIL PRESSURE, BUT OIL TEMPERATU
- [SDR CA031211001](https://openairdocs.org/sdr/CA031211001), Dec 9, 2003: LINE. CORRODED. (CAN) FUEL LINE HAD A ROUGH LOOK TO THE SURFACE. THE FUEL LINE WAS ACCESSED BY REMOVING CENTER CONSOLE COVER AND PEELING BACK CARPET. CLOSER EXAMINATION OF LINE
- [SDR 2003FA0000828](https://openairdocs.org/sdr/2003FA0000828), Jul 9, 2003: CONNECTING ROD. BROKEN. AIRCRAFT MADE EMERGENCY LANDING. NR 3 CONNECTING ROD BROKE, CAUSING A HOLE TO BE PUNCHED IN THE CRANKCASE AND DESTROYING THE CAM FOLLOWER AREA. CAUSE OF FAILURE
- [SDR CA030609012](https://openairdocs.org/sdr/CA030609012), Jun 2, 2003: ENGINE. FAILED. (CAN) DURING LANDING AFTER PASSING THE RUNWAY THRESHOLD ENGINE BROUGHT TO IDLE CAUSING IT TO STOP AND PROP TO WINDMILL. AFTER LANDING PILOT TAXIED WITH REMAININ
- [SDR 2003FA0000594](https://openairdocs.org/sdr/2003FA0000594), May 23, 2003: CYLINDER. WORN. WITH 137 HOURS ON THIS ENGINE THE OIL CONSUMPTION WENT UP. ON INSPECTION OF THE ENGINE, OIL WAS FOUND ON NR 1 AND NR 3 CYLINDER SPARK PLUGS. ALL FOUR CYLINDERS 
- [SDR 2003FA0000595](https://openairdocs.org/sdr/2003FA0000595), May 23, 2003: CYLINDER. WORN. ENG WAS REMOVED AT 353.2 HRS SMOH AND WAS SENT BACK TO MFG FOR REPAIR DUE TO METAL IN THE OIL. AT 779.5 HRS METAL WAS FOUND IN OIL SYS. WE REPLACED ALL FOUR CYL
- [SDR 2003FA0000596](https://openairdocs.org/sdr/2003FA0000596), May 23, 2003: CYLINDER. WORN. PROBLEM WITH HIGH OIL TEMP ON TEST FLIGHT. AT 280.3 OIL CONSUMPTION INCREASED AND ENG STARTED RUNNING ROUGH, WHEN CHECKING SPARK PLUGS FOUND OIL ON NR 3 CYL PLU
- [SDR 2002FA0001264](https://openairdocs.org/sdr/2002FA0001264), Oct 21, 2002: SPAR. CRACKED. FOUND CRACK EXTENDING ABOUT.5 INCH FROM OUTBOARD HINGE POINT TO SPAR ATTACHMENT.
- [SDR CA020619001](https://openairdocs.org/sdr/CA020619001), Jun 13, 2002: FORK. CRACKED. (CAN) AIRCRAFT WAS BROUGHT IN FOR ROUTINE INSPECTION. DECIDED TO DO A CLOSER INSPECTION ON THE OLEO COMPONENTS DUE TO THE HIGH TIME ON THESE UNITS. A CLOSE VISU
- [SDR 2002FA0000936](https://openairdocs.org/sdr/2002FA0000936), Apr 22, 2002: PISTON PIN. WORN. FACTORY OVERHAUL 12/96. REMOVED ENGINE FOR ALUMINUM CONTAMINATION. NR 1 PISTON PIN WEAR, NR 3 PISTON PIN WEAR.
- [SDR 2002FA0000937](https://openairdocs.org/sdr/2002FA0000937), Apr 22, 2002: PISTON PIN. WORN. FACTORY OVERHAUL 12/96. REMOVED AND REPLACED NR 4 CYLINDER DUE TO PISTON PIN WEAR/ CYLINDER RIDGE. DATE OF OCCURANCE 01/00.
- [SDR 2002FA0000940](https://openairdocs.org/sdr/2002FA0000940), Apr 22, 2002: PISTON PIN. WORN. FACTORY ENGINE OVERHAUL O1/01. ALUMINUM IN FILTER DUE TO NR 1 PISTON PIN WEAR.
- [SDR 2002FA0000938](https://openairdocs.org/sdr/2002FA0000938), Apr 12, 2002: CAP. WORN. FOUND ALUMINUM IN FILTER REMOVED AND REPLACED NR 2 CYLINDER DUE TO PISTON PIN WEAR FROM RIDGE IN CYLINDER. DATE OF OCCURANCE 11/98
- [SDR 2002FA0000939](https://openairdocs.org/sdr/2002FA0000939), Apr 12, 2002: CAP. WORN. THIS ENGINE FACTORY OVERHAUL 12/96. ALUMINUM IN FILTER, NR 1 CYLINDER WEARS A RIDGE FROM RING IN FORWARD SIDE THEN THE RIDGE WEARS PISTON PIN. DATE OF OCCURANCE
- [SDR 20000829SH013](https://openairdocs.org/sdr/20000829SH013), Aug 11, 2000: MAGNETO. FAILED. HIT/DVT - WHILE EN ROUTE PILOT REPORTED A SEVERE LOSS OF ENGINE POWER. ACFT MADE UNEVENTFUL LANDING IN THE DESERT ON AN UNCHARTED DIRT STRIP. ACFT HAD TO BE TRU
- [SDR 20000829SH014](https://openairdocs.org/sdr/20000829SH014), Aug 11, 2000: MAGNETO. FAILED. HIT/DVT - WHILE EN ROUTE PILOT REPORTED A SEVERE LOSS OF ENGINE POWER. ACFT MADE UNEVENTFUL LANDING IN THE DESERT ON AN UNCHARTED DIRT STRIP. ACFT HAD TO BE TRU
- [SDR 20000329SH044](https://openairdocs.org/sdr/20000329SH044), Mar 2, 2000: CYLINDER. DAMAGED. WHILE PERFORMING ANNUAL INSP, ALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER. FILTER SENT TO LYC FOR ANALYSIS AND DETERMINED TO BE PISTON PIN PLUG MATERIAL. UPO
- [SDR 20000329SH045](https://openairdocs.org/sdr/20000329SH045), Mar 2, 2000: CYLINDER. DAMAGED. WHILE PERFORMING ANNUAL INSP, SMALL ALUMINUM PARTICLES WERE FOUND IN THE OIL FILTER. A BORESCOPE INSP REVEALED WEAR ON CYLINDER WALLS AND PITTING AT THE BASE OF
- [SDR 20000516SH004](https://openairdocs.org/sdr/20000516SH004), Mar 2, 2000: PISTON. MAKING METAL. WHILE PERFORMING ANNUAL INSP, SMALL ALUMINUM PARTICLES FOUND IN OIL FILTER. BORESCOPE INSP REVEALED WEAR ON CYL WALLS AND PITTING AT BASE OF EACH CYL (INSIDE) A
- [SDR 99ZZZX2287](https://openairdocs.org/sdr/99ZZZX2287), May 21, 1999: PUG. WORN. FOUND METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN LYC ST 1492B. FOUND FORWARD PISTON PIN PLUG IN NR 1 CYLINDER EXCESSIVELY WORN DUE TO PI
- [SDR 99ZZZX2288](https://openairdocs.org/sdr/99ZZZX2288), May 21, 1999: PLUG. WORN. FOUND METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN LYC SI 1492B. FOUND FORWARD PISTON PIN PLUG IN NR 2 CYLINDER EXCESSIVELY WORN DUE TO PI
- [SDR 99ZZZX2289](https://openairdocs.org/sdr/99ZZZX2289), May 21, 1999: ;PLUG. WORN. FOUND METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN LYC SI 1492B. FOUND FORWARD PISTON PIN PLUG IN NR 1 CYLINDER EXCESSIVELY WORN DUE TO PI
- [SDR 99ZZZX2290](https://openairdocs.org/sdr/99ZZZX2290), May 21, 1999: PLUG. WORN. FOUND METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN LYC SI 1492B. FOUND FORWARD PISTON PIN PLUG IN NR 1 CYINDER EXCESSIVELY WORN DUE TO PIS
- [SDR 99ZZZX2192](https://openairdocs.org/sdr/99ZZZX2192), May 14, 1999: PLUG. WORN. WHILE C/W LYC SI 1492B (PISTON PIN PLUG WEAR INSPECTION) AND FINDING METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN SI 1492B, FOUND THE FORW
- [SDR 99ZZZX2193](https://openairdocs.org/sdr/99ZZZX2193), May 14, 1999: PLUG. WORN. WHILE C/W LYC SI 1492B (PISTON PIN PLUG WEAR INSPECTION) AND FINDING METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN SI 1492B, FOUND THE FORW
- [SDR 99ZZZX2199](https://openairdocs.org/sdr/99ZZZX2199), May 14, 1999: PLUG. WORN. WHILE C/W LYC SI 1492B (PISTON PIN PLUG WEAR INSPECTION) AND FINDING METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN SI 1492B, FOUND THE FORW
- [SDR 99ZZZX2191](https://openairdocs.org/sdr/99ZZZX2191), May 13, 1999: PLUG. WORN. WHILE C/W LYC SI 1492B (PISTON PIN PLUG WEAR INSPECTION) AND FINDING METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN SI 1492B, FOUND THE FORW
- [SDR 99ZZZX2201](https://openairdocs.org/sdr/99ZZZX2201), May 13, 1999: PLUG. WORN. WHILE C/W LYC SI 1492B (PISTON PIN PLUG WEAR INSPECTION) AND FINDING METAL CONTAMINATION OF OIL FILTER IN EXCESS OF LIMITS CONTAINED IN SI 1492B, FOUND THE FORW
- [SDR 99ZZZX1452](https://openairdocs.org/sdr/99ZZZX1452), Mar 22, 1999: CYLINDER. MISMANUFACTURED. VISUAL INSPECTION OF FACTORY NEW CYLINDER KIT P/N 05K21123 PRIOR TO INSTALLATION, REVEALED THE WRONG PART NUMBER OUTER EXHAUST VALVE SPRING SEAT WAS INSTALLED. 
- [SDR CA981230025](https://openairdocs.org/sdr/CA981230025), Dec 15, 1998: CALIPER HOUSING. CRACKED. (CAN) CRACK FOUND ON THE CALIPER HOUSING IN THE PIN LUG AREA.
- [SDR GLBR98100](https://openairdocs.org/sdr/GLBR98100), Jul 17, 1998: MAGNETO. FAILED. LEFT MAGNETO QUIT IN-FLIGHT. REMOVED AND REPLACED DISTRIBUTOR BLOCK AND GEAR ASSY IAW UNISON SPECS. INSTALLED ONE ENGINE IAW TEXTRON LYC SPECS. TIMED TO ENGINE.

All 55: https://openairdocs.org/engine/lycoming-o235n2c/reports.md

## STCs that may be installed (OpenAirDocs) (30)

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 SE01930NY](https://openairdocs.org/stc/SE01930NY): Installation of Casper Labs 90 degree oil filter housing adapter. Casper Labs 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 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 SE2606CE](https://openairdocs.org/stc/SE2606CE): Add unleaded and leaded automotive gasoline, 91 minimum antiknock index(RON+MON)/2 per ASTM Specification D-439. Petersen Aviation Inc
- [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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