Lycoming O-235-L2C

Service difficulty reports · 521

Newest first. General aviation reporting is voluntary.

Query with SQL
duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE engine_model_key = 'O235L2C'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR 8HBR20261010088Cylinder Head · rotatedDURING A ROUTINE ANNUAL INSPECTION CYLINDER #3 HAD OIL LEAKING AND A DAMAGED SEAL ON THE EXHAUST PUSH ROD TUBE. WHILE PERFORMING THE WORK TO REPLACE THE SEAL, THE TECHNICIAN FOUND IT DIFFICULT TO GET THE TUBE SEATED PROPERLY. UPON FURTHER INSPECTION IT APPEARESep 30, 2026 · N46889 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20260426083Tappet · separatedWHILE PERFORMING MAINTENANCE ON THE NR 3 CYLINDER ONE OF THE VALVE TAPPET BODIES SEPARATED.Apr 26, 2026 · N5366M · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20260426081Plug · wornWHILE COMPLYING WITH LYCOMING SB667A, ONE WRIST PIN PLUG ON CYLINDER #2 WAS FOUND EXCESSIVELY WORN WITH A HOLE IN THE CENTER OF THE PLUGApr 23, 2026 · N89312 · Cessna 152 · Reciprocating Engine Power SectionSDR 8HBR20260215076Ignition Lead · damagedDURING A GROUND RUN A BAD MAGNETO DROP WAS EXPERIENCED ON THE RH MAGNETO. UPON INSPECTION IT WAS FOUND THAT THE RH IGNITION HARNESS #3 LOWER LEAD WAS DEAD.Jan 15, 2026 · N49194 · Cessna 152 · Ignition Harness (Distribution)SDR 8HBR20260215073Magneto · mismanufacturedPILOT EXPERIENCED A TOTAL ENGINE FAILURE. UPON INSPECTION IT WAS FOUND THAT THE RH MAGNETO WAS ASSEMBLED INCORRECTLY, CAUSING THE DISTRIBUTOR GEAR BRUSH TO ARC TO THE COIL TAB, RESULTING IN A FAILED MAGNETO.Sep 26, 2025 · N89312 · Cessna 152 · Magneto/DistributorSDR 8HBR20260215074Magneto · mechanic errorAIRCRAFT EXPERIENCED A TOTAL LOSS OF ENGINE POWER RESULTING IN AN UNSCHEDULED LANDING. AFTER THE RH MAGNETO WAS CHANGED IN THE FIELD THE AIRCRAFT RETURNED TO HOME BASE. UPON FURTHER INVESTIGATION THE LH MAGNETO WAS REMOVED AND INSPECTED, IT WAS FOUND THAT THE Sep 26, 2025 · N89312 · Cessna 152 · Magneto/DistributorSDR 8HBR20240909068Gear · damagedCAM GEAR WAS IMPROPERLY INSTALLED/SEATED DURING MANUFACTURE, WHICH CAUSED EXCESSIVE WEAR AND DAMAGE TO THE CAM GEAR DURING ROTATION AGAINST THE DISTRIBUTOR GEAR. THIS WAS THE FIRST 500HR INSPECTION SINCE THE MAGNETO WAS MANUFACTURED.Aug 27, 2024 · N5318M · Cessna 152 · Magneto/DistributorSDR 8HBR20240909066Coil · defectiveDURING 500HR INTERNAL INSPECTION OF MAGNETO, COIL TAB WAS FOUND TO HAVE A MANUFACTURING DEFECT AND NOT SYMETRICAL. IT APPEARS THE COIL TAB WAS MACHINE PUNCHED DURING MANUFACTURING AND THE METAL WAS NOT PROPERLY POSITIONED IN THE PUNCH PRESS CAUSING THE METAL CJun 5, 2024 · N49276 · Cessna 152 · Magneto/DistributorSDR 8HBR20231216054Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF ALL PISTON PIN PLUGS BEING WORN ON ALL OF THE CYLINDERS AND THE CYLINDER WALLS HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL.Dec 14, 2023 · N68713 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20231216055Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF ALL PISTON PIN PLUGS BEING WORN ON ALL OF THE CYLINDERS AND THE CYLINDER WALLS HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL.Dec 11, 2023 · N89226 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20231216059Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF BOTH PISTON PIN PLUGS BEING WORN ON #1 CYLINDER AND THE CYLINDER WALL HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL.Dec 7, 2023 · N177BD · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20231216058Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF BOTH PISTON PIN PLUGS BEING WORN ON #1 CYLINDER AND THE CYLINDER WALL HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL.Dec 5, 2023 · N24266 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20231216061Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF BOTH PISTON PIN PLUGS BEING WORN ON #1 CYLINDER AND THE CYLINDER WALL HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL. AS WELL AS A BROKEN OIL REGULATOR RINGNov 14, 2023 · N49824 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20231216056Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF BOTH PISTON PIN PLUGS BEING WORN ON #1 CYLINDER AND THE CYLINDER WALL HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL.Oct 31, 2023 · N6400Q · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20231216057Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF BOTH PISTON PIN PLUGS BEING WORN ON #1 CYLINDER AND THE CYLINDER WALL HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL.Oct 25, 2023 · N707GS · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 8HBR20231216060Plug · wornALUMINUM SHAVINGS WERE FOUND IN THE OIL FILTER DURING 100HR INSPECTION. FOUND THIS TO BE A RESULT OF BOTH PISTON PIN PLUGS BEING WORN ON #1 AND #4 CYLINDERS AND THE CYLINDER WALLS HAVING A “RIDGE” AT THE BOTTOM OF THE RING TRAVEL.Sep 6, 2023 · N89312 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 2022FA0000501Engine · vapor lockOVER LAST 8-10 YEARS, THREE 152'S IN A FLEET OF FOUR, EXPERIENCED PARTIAL POWER LOSS ABOVE 5,000', 27 MINUTES AFTER TAKE-OFF, IN HIGH AMBIENT TEMP CONDITIONS, WITH FULL FUEL, AFTER A FULL POWER CLIMB TO 5,500 AND ABOVE. THE POWER LOSS WAS FOLLOWED BY A LANDINSep 13, 2022 · N67807 · Cessna 152 · Engine (Reciprocating)SDR 8HBR20211108036Piston · burned outPILOT EXPERIENCED POWER LOSS SHORTLY AFTER TAKE OFF AND LANDED AS SOON AS POSSIBLE. UPON REMOVAL OF SPARK PLUGS THERE WAS UNUSUAL FOULING ON CYLINDER #1 BOTTOM SPARK PLUG, LOOKING THROUGH THE SPARK PLUG HOLE OF CYLINDER #1 REVEALED A HOLE BLOWN THROUGH THE PISNov 5, 2021 · N89226 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 2020FA0000050Magneto · out of alignmentMAGNETO`S OUT OF TIME. POSSIBLY CAUSING PRE-DETONATION OF FIRING.Jan 15, 2020 · Magneto/DistributorSDR CA190617026Dowel Pin · broken(CAN) AIRCRAFT SUFFERED ENGINE LOSS. THE DOWEL AT THE REAR OF THE CRANKSHAFT BROKE CAUSING THE CAMSHAFT AND MAGNETOS NOT TO TURN. PILOT DID FORCED LANDING. NO INJURIES TO PILOT OR AIRCRAFT. SEE TSB REPORT A19P0068 (TC# 20190617026)Jun 15, 2019 · Cessna 152 · Reciprocating Engine Power SectionSDR CA190509011Cylinder · separated(CAN) SOON AFTER TAKEOFF ENGINE STARTED VIBRATING ABNORMALLY, VIBRATIONS GOT WORST AND PILOT DECLARED AN EMERGENCY AND LANDED SAFELY ON AIRPORT RUNWAY. PRIMARY INVESTIGATION SHOWS CYLINDER #3 NOT SECURED TO CRANKCASE. EFFECT OF VIBRATIONS SHOWS BROKEN EXHAUST,May 8, 2019 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR CA190503019Engine · failed(CAN) SHORT AFTER TAKE OFF PILOT REPORTED ENGINE VIBRATIONS. PILOT RETURNED TO AIRPORT AND LANDED SAFELY. MAINTENANCE PERSONNEL INSPECTED ENGINE AND FOUND SOME POTENTIAL MAJOR INTERNAL DAMAGES. ENGINE HAS BEEN REMOVED AND SENT TO ENGINE SHOP FOR INVESTIGATION.Apr 7, 2019 · Cessna 152 · Engine (Reciprocating)SDR CA190206018Exhaust Valve · seized(CAN) AT THE TIME OF THE INCIDENT, THE AIRCRAFT WAS BEING USED TO PRACTICE SLOW FLIGHT IN THE LOCAL TRAINING AREA WHEN THE FLIGHT INSTRUCTOR HAD EXPERIENCED A PARTIAL ENGINE POWER LOSS. FULL POWER WAS APPLIED AND CARBURETOR HEAT WAS TURNED OFF, HOWEVER THE ENGFeb 4, 2019 · Reciprocating Engine Cylinder SectionSDR CA190321002Rib · cracked(CAN) LOWER RIB PART NUMBER 043301015 WAS FOUND CRACKED DURING INSPECTION.Jan 15, 2019 · Cessna 152 · Rudder, Spar/RibSDR 2018FA0000220Piston · crackedNR 3 CYLINDER PISTON FAILURE RESULTING IN COMPLETE ENGINE FAILURE.Jun 7, 2018 · N93989 · Cessna 152 · Reciprocating Engine Power SectionSDR CA180529019Starter · damaged(CAN) STARTER FWD BOLTS BECAME LOOSE AND DEPARTED FROM STARTER. STARTER FWD HOUSING CAME LOOSE FROM STARTER. (TC# 20180529019)May 23, 2018 · Cessna 152 · Engine StarterSDR CA180529017Starter · damaged(CAN) STARTER FWD BOLTS BECAME LOOSE AND DEPARTED FROM STARTER. STARTER FWD HOUSING DEPARTED FROM STARTER UNTIL DISCOVERED. (TC# 20180529017)May 22, 2018 · Cessna 152 · Engine StarterSDR CA180529018Starter · damaged(CAN) STARTER CENTER BODY HOUSING CAME LOOSE. (TC# 20180529018)May 22, 2018 · Cessna 152 · Engine StarterSDR CA180529016Starter · damaged(CAN) STARTER FWD BOLTS BECAME LOOSE AND DEPARTED FROM STARTER. STARTER FWD HOUSING CAME OFF CAUSING STARTER GEAR TO CONTACT FLYWHEEL RING GEAR. (TC# 20180529016)May 2, 2018 · Cessna 152 · Engine StarterSDR 2017FA0000520Cylinder Head · crackedONE CYLINDER WAS CRACKED AT THE CROWN OF THE HEAD. CRACK WAS VISIBLE BETWEEN THE CYLINDER FINS WITH EXHAUST PRINTING VISIBLE.Oct 18, 2017 · N24766 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 2017FA0000420Spring · failedBROKEN PARKING BRAKE SPRING. AFTER PERFORMING ENGINE RUN UP, LEFT BRAKE STUCK DUE TO A BROKEN PARKING BRAKE SPRING THAT RETAINS PLATE LOCK.Aug 10, 2017 · N5369H · Cessna 152 · Landing Gear Brake SystemSDR FQAR20170516024Throttle Cable · twistedPILOTS REPORTED THE ENGINE WOULD RANDOMLY LOSE 50 - 200 RPM DURING CRUISE FLIGHT. REPEATED INSPECTIONS COULD FIND NO MECHANICAL BASIS FOR THE REPORTED ISSUE. FINALLY, WHEN THE ENGINE WAS GROUND RUN WITH THE COWLINGS OFF, AN OBSEERVER POSTED BY THE AIRCRAFTMay 16, 2017 · N626PA · Cessna 152 · Power LeverSDR 2017FA0000391Shaft · failedAT 540 HRS OF OPERATION, THE THROTTLE SHAFT HAS WORN SO BADLY THAT REPLACEMENT WAS NECESSARY. THIS CARBURETOR REPLACED THE LAST ONE DUE TO THE SAME PROBLEM AT 440 HRS OF OPERATION. THIS PARTICULAR SHAFT HAS WORN .025" IN 540 HRS OF OPERATION. THIS ACFT IS AFeb 11, 2017 · N5178B · Cessna 152 · Fuel Control/Reciprocating EnginesSDR 2016FA0000342Carburetor · defectiveON JULY 19, 2016, ON AN INSTRUCTIONAL FLIGHT, EXPERIENCED A MALFUNCTION, POWER TO THE ENGINE COULD NOT BE REDUCED BELOW 2000 RPM. THROTTLE WAS PULLED FULL OUT INDICATING FULL REDUCTION IN POWER. WITH NO SUCCESS IN REDUCING POWER, PIC INFORMED ATC OF THE MALFJul 19, 2016 · N93434 · Cessna 152 · Fuel Control/Reciprocating EnginesSDR 2016FA0000298Piston · brokenCATASTROPHIC FAILURE. NR 3 ROD BROKEN. CRANKCASE DESTROYED. CRANKSHAFT DESTROYED. NR 3 AND NR 4 CYLINDERS DAMAGED BEYOND REPAIR. ENGINE WAS MODIFIED IAW STC SE793NW FOR 9.7:1 COMPRESSION PISTONS. PILOT REPORTED LEANING ENGINE IN NORMAL FLIGHT SITUATIONS.Jun 20, 2016 · N68814 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 5HAS2016FA0000302Bypass Valve · defectiveOIL THERMAL BYPASS VALVE WAS FOUND TO NOT MAINTAIN SPECIFIC OPERATING TEMPERATURES, VALVE WAS REPLACED WITH A SERVICEABLE UNIT WITH NO FURTHER ISSUES NOTED.Jun 20, 2016 · N68713 · Cessna 152 · Reciprocating Engine Oil SystemSDR 2016FA0000209Carburetor · malfunctionedENGINE QUIT AT 300 FT DURING TAKEOFF. ACFT RETURNED TO AIRPORT SAFELY. ENGINE INTERMITTENTLY ROUGH DURING RUN UP AFTER LANDING, TAXI TO RAMP DID FULL POWER RUN UP RAN SMOOTH AND DID MAGNETO CHECK EVERYTHING OK. RAN FOR TEN MINUTES NO ISSUES. SUSPECT CARBURApr 28, 2016 · N714XB · Cessna 152 · Fuel Control/Reciprocating EnginesSDR CA160310006Cylinder · oil consumption(CAN) ENGINE WAS O/H ON 2013-10- 29 WITH NEW CYLINDER KITS, PN : 051, 23037. ACFT WAS RETURNED TO SERVICE FOR OPERATION. ON 2015-0714, WITH A TOTAL OF 389.9 HRS. ALL CYLINDERS WERE REMOVED DUE TO HIGH OIL CONSUMPTION. REPAIRS WERE MADE BY AN AMO AND RE-INSMar 10, 2016 · Cessna 152 · Reciprocating Engine Cylinder SectionSDR 2016FA0000128Pressure Switch · leakingTHIS IS A NORMALLY OPEN OIL PRESSURE SWITCH. CONTACTS CLOSE AT 4 PSI TO ACTIVATE THE ENGINE HR METER. THE SWITCH CONSTRUCTION IS METAL BODY, CRIMPED ON THE PLASTIC SWITCH. THIS IS WHERE THE OIL LEAK PROBLEM STARTS. THIS IS THE SECOND SWITCH TO FAIL AND LEAFeb 12, 2016 · N60189 · Beech 77 · Engine Oil Indicating SystemSDR CA160211007Muffler · burned(CAN) WHILE AME WAS DOING MORNING SERVICING OF ACFT BEFORE BEING REMOVED FROM HANGAR NOTICED DISCOLORATION ON END OF TAIL PIPE. EXHAUST SOOT WAS CLEANED OFF. SMALL HOLE NOTICED BURNED THRU TAIL PIPE. EXHAUST WAS REPLACED WITH NEW UNIT.Feb 11, 2016 · Cessna 152 · Engine Noise SuppressorSDR CA151126001Rib · cracked(CAN) DURING RT ELEVATOR REMOVAL MAINTENANCE NOTICED PLAY IN THE OTBD HINGE ASSY, PN 0432165-1. UPON FURTHER INSPECTION MAINTENANCE FOUND RIB, PN 0432001-53 CRACKED UNDER THE OTBD HINGE IN 2 PLACES. THE RIB/HINGE ASSY WAS REPLACED WITH A SERVICEABLE PART ANDNov 25, 2015 · Cessna 152 · Elevator, Spar/RibSDR 2015FA0000656Line · crackedA STUDENT PILOT DURING SOLO FLIGHT REPORTED FUEL LEAKING IN THE COCKPIT. LANDED ACFT AND MAINTENANCE DID AN INSPECTION TO FIND THAT THE PRIMER LINE FROM THE FIREWALL TO THE INLET SIDE OF THE PRIMER HAD CRACKED. R & R PRIMER LINE. RETURNED ACFT TO SERVICE.Nov 11, 2015 · N478BK · Cessna 152 · Aircraft Fuel Distribution SystemSDR CA151105005Rib · cracked(CAN) A SLIGHT BUCKLE IN THE STABILIZER TOP SKIN JUST AHEAD OF THE FORWARD SPAR WAS NOTICED AS ACFT WAS PUSHED INTO HANGAR. UPON FURTHER INVESTIGATION IT WAS FOUND THAT THE NOSE RIB INSIDE THE L/E WAS CRACKED. STABILIZER REMOVED FOR REPAIR AND REINSTALLED AFTNov 5, 2015 · Cessna 152 · Horizontal Stabilizer, Spar/RibSDR CA150727021Mount · cracked(CAN) UPON LANDING THE PILOT NOTICED A NOSE GEAR SHIMMY. UPON INVESTIGATING, THE ENGINE MOUNT WAS FOUND TO BE CRACKED AT THE LOWER NOSE GEAR ATTACH. MOUNT WAS REPAIRED AND ACFT WAS PLACED BACK IN SERVICE.Jul 23, 2015 · Cessna 152 · Engine Mount SectionSDR CA150703004Drive Shaft · worn(CAN) LOSS OF POWER REPORTED AFTER TAKEOFF 150 RPM LOSS REPORTED ENGINE INSPECTED AND RT MAGNETO WAS NOTED THAT THE CAM WAS LOOSE IN THE DRIVE SHAFT. A NEW CAM WAS INSTALLED BUT FOUND TO ALSO BE LOOSE. MAG TTSN 215.6 HRS. LT MAGNETO WAS THEN INSPECTED AND FJun 27, 2015 · Cessna 152 · Magneto/DistributorSDR 2015FA0000240Piston · brokenREMOVED NR 3 CYLINDER DUE TO LOW COMPRESSION, 62/80 PSI, AND FOUND 1"X.5" PIECE MISSING FROM PISTON SKIRT.May 14, 2015 · N4960A · Cessna A152 · Reciprocating Engine Power SectionSDR 5HAS2015FA0000199Bolt · shearedAIRCRAFT WAS RECEIVED FOR IT'S SCHEDULED 100 HR INSPECTION, UPON COMPLETION OF THE PRELIMINARY INSPECTION THE FIN ATTACH BOLT AN4-6A THAT IS INSTALLED VERTICALLY THROUGH FITTING, PN: 0431009-3 WAS FOUND SHEARED. THE NUT AND SHANK OF THE BOLT WAS STILL PRESENTMay 12, 2015 · N64895 · Cessna 152 · Vertical StabilizerSDR U9FS2015FA0000185Distributor Gear · looseDURING INSPECTION OF THE RT MAGNETO, AFTER FAILURE OF THE MAGNETO, FOUND THE DISTRIBUTOR GEAR ARM TO BE LOOSE. INSPECTION OF THE DISTRIBUTOR GEAR SHOWED THE METHOD OF ATTACHING THE ARM TO THE GEAR HAD BEEN CHANGED. THE PREVIOUS METHOD IS OBVIOUSLY STRONGER. THMay 8, 2015 · N49158 · Cessna 152 · Magneto/DistributorSDR 2015FA0000182Distributor Gear · separatedDURING A ROUTINE TRAINING FLIGHT, THE ENGINE BEGAN TO RUN ROUGH AND, INTERMITTENTLY, STOP RUNNING. THE ENGINE LOST POWER AND THE CFI WAS FORCED TO LAND IN A SOFT FIELD. AFTER THE ACFT WAS RECOVERED, THE ENGINE WAS TEST RUN. THE LEFT MAG WAS INOPERATIVE. THMay 7, 2015 · Cessna 152 · Magneto/DistributorSDR U9FS2015FA0000184Distributor Gear · looseDURING A ROUTINE TRAINING FLIGHT, ENGINE BEGAN TO RUN ROUGH AND LOST POWER. ACFT MADE A FORCED LANDING IN A PLOWED FIELD CAUSING DAMAGE TO THE NOSE GEAR AND ENGINE MOUNT. LOSS OF ENGINE POWER WAS CAUSED BY THE FAILURE OF THE LT MAGNETO DISTRIBUTOR GEAR ARM WMay 1, 2015 · N49158 · Cessna 152 · Magneto/Distributor
Back to Lycoming O-235-L2C