# Service difficulty reports: Continental C85-12F A list on [Continental C85-12F](https://openairdocs.org/engine/continental-c85-12f.md). Newest first. General aviation reporting is voluntary. - [SDR 2025FA0000450](https://openairdocs.org/sdr/2025FA0000450.md): Air Box · inflt separation · Jul 5, 2025 · N82439 · Aronca LSA7BCM · Engine Air Intake System > INSTALLED NEW UNIVAIR FAA/PMA CARBURETOR AIR-BOX, P/N U4-601-1 (144348). AFTER 1.3 HOURS FLIGHT TIME THE AIR OUTLET TUBE FLANGE ON THE BOTTOM OF THE BOX WHICH HAD BEEN ATTACHED BY SPOT WELDING, COMPLETELY SEPARATED AT THE SPOT WELDS AND DEPARTED FROM THE AIRCR - [SDR 2024FA0000555](https://openairdocs.org/sdr/2024FA0000555.md): Isolation Mount · cracked · Aug 1, 2024 · N72885 · Cessna 140 · Engine Mount Section > DURING THE REPLACEMENT OF THE ENGINE MOUNTS, WE FOUND THAT THE TORQUE CALLED OUT IN THE MAINTENANCE MANUAL (CESSNA 100- SERIES SERVICE MANUAL 1962 AND PRIOR PARA 12-10(B) AND PAGE 1-8 FOR 3/8-24 AN310 SELF LOCKING NUT NOTE 2 (160-190 IN. LBS)) APPEARS TO BE E - [SDR 2023FA0000315](https://openairdocs.org/sdr/2023FA0000315.md): Propeller · broken · Apr 27, 2023 · N6384H · Piper J3C* · Propeller Assembly > ABOUT FIVE INCHES OF PROPELLER BLADE #1 SEPARATED FROM TIP DURING FLIGHT REQUIRING AN IMMEDIATE EMERGENCY LANDING. - [SDR 2022FA0000173](https://openairdocs.org/sdr/2022FA0000173.md): Magneto · broken · Mar 29, 2022 · Magneto/Distributor > MAGNETO IMPULSE BROKEN INTO SEVERAL PARTS. HAVE PHOTOS OF THE PARTS THAT CAN BE E-MAILED UP ON REQUEST. - [SDR 2016FA0000187](https://openairdocs.org/sdr/2016FA0000187.md): Wheel Half · failed · Jan 31, 2016 · N47185 · Aronca 058B · Wheel/Ski/Float > LEFT INNER WHEEL HALF FAILED ON LANDING ROLL. RACE SHELF BROKEN OFF AND FOUND INSIDE WHEEL. NO DAMAGE TO LANDING GEAR AXLE, BRAKE SHOE MECHANISM/INSTALLATION, LANDING GEAR STRUTS, LANDING GEAR BRACES OR FABRIC TRIANGLE COVERS. NEW RACES AND BEARINGS INSTALL - [SDR CA120516001](https://openairdocs.org/sdr/CA120516001.md): Brake Assy · failed · Apr 21, 2012 · Univar 415* · Landing Gear Brake System > (CAN) LT BRAKE ASSY FAILED ON LANDING AND APPLICATION OF BRAKES. BRAKE ROTOR AND BRAKE CALIPER DESTROYED AFTER APPLICATION AND RENDERING BRAKE SYS INOPERATIVE ON ROLL OUT AND TAXI. - [SDR CA091113003](https://openairdocs.org/sdr/CA091113003.md): Guide · broken · Nov 5, 2009 · Cessna 140 · Reciprocating Engine Cylinder Section > (CAN) BROKEN VALVE GUIDE DETECTED AS THE ANNUAL 1 100 HR INSPECTION. CYLINDER ASSY REMOVED, LOW COMPRESSION ON DIFFERENTIAL TEST 20/80 SENT TO AMO FOR REPAIR NOTE: CYLINDER ASSY WAS PURCHASED NEW OCT. 2004 - 245.0 HR. - [SDR 2009FA0000622](https://openairdocs.org/sdr/2009FA0000622.md): Crankshaft · sheared · Jun 11, 2009 · N9382 · Doug DC3C · Reciprocating Engine Power Section > CRANKSHAFT SHEARED WHILE IN FLIGHT. - [SDR 2008FA0000301](https://openairdocs.org/sdr/2008FA0000301.md): Muff · failed · Apr 18, 2008 · N2004 · Luscom 8E · Engine Air Intake System > AFTER A FLIGHT, IT WAS NOTED THAT A PORTION OF SCAT HOSE WAS HANGING FROM THE BOTTOM OF COWLING OPENING. UPON INSPECTION IT WAS FOUND THAT THE CARBURETOR HEAT FLANGE HAD SEPARATED WITH THE SCAT HOSE ATTACHED WITH CLAMP FRO THE IB HALF OF THE RT CARB HEAT MUFF - [SDR 2008FA0000153](https://openairdocs.org/sdr/2008FA0000153.md): Chain · loose · Feb 12, 2008 · N5055Q · Cessna 172S · Fuel Storage > LT FUEL GAUGE INDICATED 10 GAL. IN TANK AT ALL FUEL LEVELS. THE TANK WAS DRAINED AND ACCESS COVER REMOVED. THE FUEL CAP RETAINING CHAIN WAS FOUND TO HAVE COME LOOSE ON THE TANK END (S) HOOK AND WRAPPED AROUND THE ARM ON THE FUEL LEVEL SENDING UNIT LOCKING IT A - [SDR CA070717009](https://openairdocs.org/sdr/CA070717009.md): Bracket · broken · May 12, 2007 · Cessna 120 · Propeller Spinner Section > (CAN) V-BRACKET OF SPINNER BROKE ON ONE SIDE, THAT CAUSED OFFSET OF SPINNER WHICH CAUSED VIBRATION AND DECIDED TO CONDUCT A PRECAUTIONARY LANDING ON A FARMERS FIELD. NO FURTHER DAMAGE. (TC NR 20070717009) - [SDR 2006FA0001034](https://openairdocs.org/sdr/2006FA0001034.md): Oil Filter · contaminated · Oct 27, 2006 · N72951 · Cessna 140 · Reciprocating Engine Oil System > DURING CRUISE FLIGHT, OIL PRESSURE DROPPED TO BELOW MINIMUM REDLINE. PRECAUTIONARY LANDING WAS MADE. ON INSPECTION, DISCOVERED RECENTLY INSTALLED (2 HOURS IN SERVICE) OIL FILTER HAS DESIGN AND/OR MANUFACTURING DEFECT ALLOWING AN INTERNAL SEAL TO BE DAMAGED D - [SDR 2006FA0001035](https://openairdocs.org/sdr/2006FA0001035.md): Oil Filter · contaminated · Oct 27, 2006 · N72951 · Cessna 140 · Reciprocating Engine Oil System > DURING CRUISE FLIGHT, OIL PRESSURE DROPPED TO BELOW MINIMUM REDLINE. PRECAUTIONARY LANDING WAS MADE. ON INSPECTION, DISCOVERED RECENTLY INSTALLED (2 HOURS IN SERVICE) OIL FILTER HAS DESIGN AND/OR MANUFACTURING DEFECT ALLOWING AN INTERNAL SEAL TO BE DAMAGED D - [SDR CA040430001](https://openairdocs.org/sdr/CA040430001.md): Rib · corroded · Apr 26, 2004 · Univar 415CD · Wing Spar > (CAN) DURING INSPECTION TO COMPLY WITH AD 2003-21-01 SEVERE CORROSION FOUND ON FORWARD END OF RIB, AFT OF REAR SPAR, IN THE RT CENTER SECTION, BETWEEN THE FUSELAGE AND WING. THE CORROSION WAS NOT READILY NOTICEABLE UNTIL INSTALLATION OF INSPECTION PANELS SK 80 - [SDR CA040312003](https://openairdocs.org/sdr/CA040312003.md): Cylinder Head · misaligned · Mar 12, 2004 · Cessna 120 · Reciprocating Engine Cylinder Section > (CAN) ENGINE WAS SENT TO ENGINE SHOP FOR PROP STRIKE INSPECTION. UPON REINSTALLATION OF NR 1 CYLINDER, IT WAS DISCOVERED THAT THE BARREL AND HEAD WERE MISALIGNED BY APPROX. 5 DEGREES (UNIT WAS REPLACED). ENGINE SHOP ADVISES THIS IS A DEFECT OCCURING DURING O - [SDR 2004FA0000080](https://openairdocs.org/sdr/2004FA0000080.md): Spar · corroded · Jan 19, 2004 · N93517 · Univar 415C · Wing Spar > AD 2002-26-02 CORROSION INSPECTION: REMOVED BOTH WINGS AND BOTH FUEL TANKS. INSPECTED ENTIRE CENTER SECTION AND FOUND FOUR QUARTER SIZED AREAS OF LIGHT CORROSION ON FWD SIDE OF FRONT CENTER SECTION SPAR. CORROSION AREAS WERE SANDED WITH 240 GRIT SANDPAPER AND - [SDR 2003FA0000618](https://openairdocs.org/sdr/2003FA0000618.md): Rib · corroded · Jun 10, 2003 · N147VX · Univar 415C · Wing, Rib/Bulkhead > AD 2002-26-02 ADMENDMENT 39-12987, MFG SERVICE BULLETIN NR 31. METHOD 1, INSPECTION HOLES IN WING CENTER SECTION. INSPECTED FRONT AND REAR SPARS...NO EVIDENCE OF CORROSION. DISCOVERED CORRODED RIB, RIGHT SIDE TRAILING EDGE WING WALK BOX. REMOVED AND REPLACED - [SDR CA030515003](https://openairdocs.org/sdr/CA030515003.md): Bellcrank · cracked · May 9, 2003 · Cessna 120 · Rudder Control System > (CAN) DURING INVESTIGATION THE RUDDER BELLCRANK WAS FOUND CRACKED. - [SDR 99ZZZX4684](https://openairdocs.org/sdr/99ZZZX4684.md): Rod · failed · Nov 29, 1999 · N76470 · Cessna 120 · Reciprocating Engine Cylinder Section > PILOT REPORTED LOSS OF OIL PRESSURE. THIS WAS FOLLOWED BY ABNORMAL ENGINE SOUNDS. UPON INSPECTION, THE ENGINE TURNED FREELY, THE CABLE WAS FOUND CRACKED ABOVE THE NR 4 CYLINDER. CRACK APPEARS TO HAVE BEEN CAUSED BY A BROKEN CONNECTING ROD. - [SDR 99ZZZX3066](https://openairdocs.org/sdr/99ZZZX3066.md): Piston Ring · failed · Jul 1, 1999 · N77310 · Cessna 140 · Reciprocating Engine Cylinder Section > REMOVED CYLINDERS BECAUSE LOWER COMPRESSION. FOUND BROKEN RINGS ON NR 2, NR 3, AND NR 4 CYLINDERS. CAUSE UNKNOWN. - [SDR AU990098](https://openairdocs.org/sdr/AU990098.md): Crankshaft · damaged · Jan 20, 1999 · Univar 415D · Reciprocating Engine Power Section > (AUS) CRANKSHAFT AND TIMING GEARS DAMAGED. ENGINE HAD BEEN OVERHAULED IN THE USA APPROXIMATELY 285 HOURS PREVIOUSLY. - [SDR CA980602091](https://openairdocs.org/sdr/CA980602091.md): Blade · corroded · May 29, 1998 · Piper J3F65 · Propeller Blade Section > (CAN) PROPELLER RECEIVED FOR CORROSION INSPECTION. CORROSION REMOVED. - [SDR 98ZZZX2687](https://openairdocs.org/sdr/98ZZZX2687.md): Generator · failed · Dec 12, 1997 · N84L · Bbavia S7DC · DC Generator-Alternator > PARTS 530412 NUT, 2.531325 GEAR 530407, SLEEVE 4.632050 BUSHING 352030 RETAINER. THESE COMPONENTS FAILED CAUSING THE GENERATOR SHAFT TO FAIL. THE PARTS WERE CHEWED UP BY THE CAMSHAFT GEAR AND METAL CONTAMINATED THE OIL SYSTEM. THE ACCESSORY CASE WAS ALSO DA - [SDR CA970709003](https://openairdocs.org/sdr/CA970709003.md): Vertical Stab · cracked · Jun 16, 1997 · Fleet FLEET80 · Vertical Stabilizer, Spar/Rib > (CAN) LEADING EDGE 4130 TUBE OF VERTICAL STABILIZER FOUND CRACKED THROUGH JUST ABOVE THE SOCKET ON THE FUSELAGE. - [SDR 97ZZZX790](https://openairdocs.org/sdr/97ZZZX790.md): Distributor Blk · worn · Jan 20, 1997 · N1859V · Cessna 140 · Magneto/Distributor > TROUBLESHOT IGNITION SYSTEM. FOUND LEFT MAGNETO TO BE PROBLEM. DISASSEMBLED MAGNETO AND FOUND ROTOR GEAR RUBBING ON DISTRIBUTOR BLOCK HOUSING. DISTRIBUTOR BLOCK HOUSING WAS WARPED. ALSO FOUND BUSHING IN DISTRIBUTOR BLOCK HOUSING WAS WORN THROUGH ON SIDE TO - [SDR 97ZZZX557](https://openairdocs.org/sdr/97ZZZX557.md): Valve · failed · Dec 16, 1996 · N87226 · Univar 415C · Reciprocating Engine Cylinder Section > NR 1 CYLINDER SWALLOWED EXHAUST VALVE. HEAD OF VALVE EMBEDDED IN PISTON. - [SDR CA960527006](https://openairdocs.org/sdr/CA960527006.md): Spar · cracked · Apr 15, 1996 · Bbavia 7BCM · Wing Spar > (CAN)ON INSPECTION THE REAR SPAR WAS FOUND FAILED (CRACKED) AT THE RIGHT HAND REAR SPAR ROOT END BISCUIT. IT WAS NOTED TO HAVE FAILED ACROSS THE TOP AT THE SECTION OF THE SPAR THAT IS MILLED OUT TO ACCOMMODATE THE BISCUIT DOUBLERS. SUBMITTER STATES THAT THE AI - [SDR CA960304004](https://openairdocs.org/sdr/CA960304004.md): Fuel · contaminated · Feb 13, 1996 · Fleet FLEET80 · Fuel Storage > (CAN) DURING FINAL APPROACH, ENGINE STARTED TO RUN ROUGH, BUT WORKING THROTTLES SEEMED TO FIX PROBLEM. ON SHORT FINAL, ENGINE QUIT AND THEN PROPELLER STOPPED. GLIDE INITIATED BUT LANDED SHORT IN A SHED. INVESTIGATION REVEALED THAT FUEL LINE FROM STRAINER HAD B ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql 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 = 'C8512F' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/engine/continental-c85-12f/reports --- 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.