# Continental IO-520-C

- Type: Engine model (FAA registry)
- Registry code: 17232
- Manufacturer (registry): CONT MOTOR
- Model: IO-520-C
- Engine type: Reciprocating
- Power: 285 hp
- Data sheet: [TCDS E5CE](https://openairdocs.org/tcds/E5CE) (OpenAirDocs)
- Holder: Continental Aerospace Technologies, Inc.
- Installed in: 4 registered aircraft
- Page: https://openairdocs.org/engine/continental-io-520-c

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 2023-17-04](https://openairdocs.org/ad/2023-17-04): Reciprocating Engine Oil System · F & M Enterprises' Model C6LC, C6LC-S or C6LC-L oil filter… (Stratus Tool Technologies STC SE09356SC or 2 others). Effective Oct 26, 2023
- [AD 2023-05-16](https://openairdocs.org/ad/2023-05-16): Reciprocating Engine Power Section · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 147 more. Effective Mar 15, 2023
- [AD 2023-02-12](https://openairdocs.org/ad/2023-02-12): Engine Air Intake System · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 127 more. Effective Feb 17, 2023
- [AD 2022-16-03](https://openairdocs.org/ad/2022-16-03): Engine (RECIPROCATING) · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 236 more. Effective Aug 15, 2022
- [AD 2016-16-12](https://openairdocs.org/ad/2016-16-12): Cylinder assemblies · Continental Motors LTSIO-520-AE, TSIO-520-A, TSIO-520-AE and 89 more. Effective Sep 15, 2016
- [AD 2014-05-29](https://openairdocs.org/ad/2014-05-29): SAP replacement parts manufacturer approval (PMA) investment cast cylinder assemblies · Continental Motors TSIO-520-A, TSIO-520-AE, TSIO-520-AF and 55 more. Effective Apr 25, 2014
- [AD 2012-03-06](https://openairdocs.org/ad/2012-03-06): Fuel servo diaphragm · Continental Motors 6-260-A, 6-285-A, 6-285-B and 482 more. Effective Feb 24, 2012
- [AD 2010-11-04](https://openairdocs.org/ad/2010-11-04): Hydraulic lifters · Continental Motors FSO-470-A, GIO-470-A, GTSIO-520-C and 190 more. Effective Jun 16, 2010
- [AD 2009-19-07](https://openairdocs.org/ad/2009-19-07): EQ3 cylinders · Continental Motors IO-470-C, IO-470-D, IO-470-E and 72 more. Effective Oct 7, 2009
- [AD 2007-04-19 R1](https://openairdocs.org/ad/2007-04-19-R1): SAP cylinder assemblies · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 314 more. Effective May 7, 2007
- [AD 2004-08-10](https://openairdocs.org/ad/2004-08-10): Serial-numbered (SN) cylinders · Modify Teledyne Continental TSIO-520-NB engine (RAM Aircraft Limited Partnership STC SE09104SC or 4 others). Effective May 5, 2004
- [AD 2000-23-21](https://openairdocs.org/ad/2000-23-21): Crankshaft · Continental Motors IO-360-A, IO-360-AB, IO-360-B and 164 more. Effective Dec 12, 2000
- [AD 99-19-01](https://openairdocs.org/ad/99-19-01): No. 2 and No. 5 Crankshaft Inspections · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 127 more. Effective Sep 30, 1999
- [AD 97-26-17](https://openairdocs.org/ad/97-26-17): Crankshaft · Continental Motors IO-360-A, IO-360-AB, IO-360-B and 90 more. Effective Jan 23, 1998
- [AD 96-12-22](https://openairdocs.org/ad/96-12-22): Full Flow Engine Oil Adapter · Bellanca CH-300 Pacemaker, 120, 140 and 361 more. Effective Jul 31, 1996
- [AD 95-21-15](https://openairdocs.org/ad/95-21-15): Aviation Gasoline · Continental Motors A-65-8, C85-12F, C85-12FJ and 77 more. Effective Nov 28, 1995
- [AD 95-03-14](https://openairdocs.org/ad/95-03-14): Engine Mount Brackets · Continental Motors IO-346-A, IO-346-B, IO-520-C and 2 more. Effective Mar 13, 1995
- [AD 93-16-15](https://openairdocs.org/ad/93-16-15): Fuel Pump Drive Shaft · Continental Motors IO-520-B, IO-520-BA, IO-520-BB and 27 more. Effective Dec 14, 1993
- [AD 93-08-17](https://openairdocs.org/ad/93-08-17): Oil Pick-Up Tube · Continental Motors IO-470-A, IO-470-C, IO-470-D and 104 more. Effective Aug 23, 1993
- [AD 93-10-02](https://openairdocs.org/ad/93-10-02): Missing Cylinder Valve Retainer Key · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 180 more. Effective Aug 12, 1993
- [AD 91-19-03](https://openairdocs.org/ad/91-19-03): Oil Filter · Continental Motors 6-285-A, 6-285-B, 6-285-BA and 169 more. Effective Sep 29, 1991
- [AD 88-03-06](https://openairdocs.org/ad/88-03-06): Oil Filter · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 155 more. Effective Apr 15, 1988
- [AD 86-13-04 R3](https://openairdocs.org/ad/86-13-04-R3): Cylinder Assemblies · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 44 more. Effective Feb 24, 1988
- [AD 81-24-06](https://openairdocs.org/ad/81-24-06): Engine Driven Fuel Pumps · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 51 more. Effective Nov 23, 1981
- [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 80-01-04](https://openairdocs.org/ad/80-01-04): Cylinder Holddown Flange Assemblies · Continental Motors IO-520-A, IO-520-B, IO-520-BA and 44 more. Effective Jan 25, 1980
- [AD 79-05-09](https://openairdocs.org/ad/79-05-09): Oil Pump Assembly Or Oil Pressure Relief Valve Screw And/Or Plunger · Teledyne Continental Motors 6-285-CA, GTSIO-520-C, GTSIO-520-D and 60 more. Effective Mar 12, 1979
- [AD 70-14-07](https://openairdocs.org/ad/70-14-07): Fuel Injection Pump · Continental Motors IO-360-A, IO-360-C, IO-360-D and 25 more. Effective Nov 22, 1974
- [AD 72-24-03](https://openairdocs.org/ad/72-24-03): Oil Filter Adapter · Continental Motors IO-360-A, IO-520-B, IO-520-C and 3 more. Effective Nov 15, 1972
- [AD 98-01-08](https://openairdocs.org/ad/98-01-08): Exhaust Roller Rocker Arm · Roller rocker arm P/N PE 92I intake and PE92E exhaust (Performance Engineering STC SE8594SW)
- [AD 77-13-22](https://openairdocs.org/ad/77-13-22): Crankcase Cracks · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 22 more

Historical (superseded or no longer in force):

- [AD 2023-04-08](https://openairdocs.org/ad/2023-04-08) (historical): Reciprocating Engine Power Section · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 141 more. Effective Feb 23, 2023
- [AD 2022-04-04](https://openairdocs.org/ad/2022-04-04) (historical): Reciprocating Engine Oil System · F & M Enterprises' Model C6LC, C6LC-S or C6LC-L oil filter… (Stratus Tool Technologies STC SE09356SC or 2 others). Effective Mar 29, 2022
- [AD 2009-24-52](https://openairdocs.org/ad/2009-24-52) (historical): Hydraulic lifters · Continental Motors FSO-470-A, GIO-470-A, GTSIO-520-C and 192 more
- [AD 2009-24-51](https://openairdocs.org/ad/2009-24-51) (historical): Hydraulic lifters · Teledyne Continental Motors FSO-470-A, GIO-470-A, GTSIO-520-C and 156 more
- [AD 2009-16-03](https://openairdocs.org/ad/2009-16-03) (historical): Cylinder assemblies · Continental Motors IO-520-A, IO-520-B, IO-520-BA and 55 more. Effective Sep 9, 2009
- [AD 2000-08-51](https://openairdocs.org/ad/2000-08-51) (historical): Crankshaft · Teledyne Continental Motors IO-360-A, IO-360-AB, IO-360-B and 158 more
- [AD 94-09-07](https://openairdocs.org/ad/94-09-07) (historical): Engine Mount Brackets · Teledyne Continental Motors IO-346-A, IO-346-B, IO-520-C and 2 more. Effective Jul 5, 1994
- [AD 94-14-12](https://openairdocs.org/ad/94-14-12) (historical): Octane Aviation Gasoline · Teledyne Continental Motors A-65-8, C85-12, E185-11 and 68 more
- [AD 99-09-17](https://openairdocs.org/ad/99-09-17) (historical): Crankshaft · Teledyne Continental Motors IO-470-A, IO-470-C, IO-470-D and 114 more

## Information bulletins (advisory) (11)

- [SAIB NE-20-05](https://openairdocs.org/saib/NE-20-05): POWERPLANT - Engine Camshaft Gear Tooth Fracture. Issued Apr 6, 2020
- [SAIB NE-18-16](https://openairdocs.org/saib/NE-18-16): POWERPLANT  Alternator Drive Coupling. Issued Jun 20, 2018
- [SAIB NE-17-11](https://openairdocs.org/saib/NE-17-11): POWERPLANT  Engine damage as a result of kickback. Issued May 10, 2017
- [SAIB NE-16-13](https://openairdocs.org/saib/NE-16-13): Powerplant - Prohibited use of sealant. Issued Mar 8, 2016
- [SAIB NE-13-15](https://openairdocs.org/saib/NE-13-15): Engine Controls: Continental Motors, Inc. (CMI) Throttle and Mixture Control Levers. Issued Feb 8, 2013
- [SAIB NE-13-04](https://openairdocs.org/saib/NE-13-04): Continental Motors, Inc. (CMI) Connecting Rod Piston Pin Bushing Inspection. Issued Oct 31, 2012
- [SAIB NE-10-09](https://openairdocs.org/saib/NE-10-09): Reciprocating Engine Power Section: Hydraulic Valve Lifters. Issued Nov 20, 2009
- [SAIB NE-10-07](https://openairdocs.org/saib/NE-10-07): Reciprocating Engine Cylinder: Identification Information for Superior Air Parts, PMA Cylinder Heads for Teledyne Continental Motors (TCM) IO-520, TSIO-520,and IO-550 Series Engines.. Issued Nov 2, 2009
- [SAIB NE-09-08](https://openairdocs.org/saib/NE-09-08): Reciprocating Engine Cylinder Section. Issued Jan 30, 2009
- [SAIB NE-07-09R1](https://openairdocs.org/saib/NE-07-09R1): Periodic Inspections of ECi Cylinder Assemblies for Cracks in the Aluminum Head. Issued Mar 21, 2007
- [SAIB NE-02-41](https://openairdocs.org/saib/NE-02-41): . Issued Aug 8, 2002

## Registered aircraft (4)

- [N17CJ](https://openairdocs.org/aircraft/N17CJ): [16d Aviation LLC](https://openairdocs.org/faa-owner/16D%20AVIATION%20LLC), [Vashon, WA](https://openairdocs.org/faa-place/WA/Vashon), built 1968, S/N U206-1199
- [N19TL](https://openairdocs.org/aircraft/N19TL): [Hall Kurt D](https://openairdocs.org/faa-owner/HALL%20KURT%20D), [Fort Lauderdale, FL](https://openairdocs.org/faa-place/FL/Fort%20Lauderdale), built 1975, S/N U20602629
- [N865MC](https://openairdocs.org/aircraft/N865MC): [N865mc LLC](https://openairdocs.org/faa-owner/N865MC%20LLC), [Knoxville, TN](https://openairdocs.org/faa-place/TN/Knoxville), built 1973, S/N TE 905
- [N900KB](https://openairdocs.org/aircraft/N900KB): [N900kb LLC](https://openairdocs.org/faa-owner/N900KB%20LLC), [California, MD](https://openairdocs.org/faa-place/MD/California), built 1977, S/N TH-863

## 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 ERA13LA129](https://openairdocs.org/ntsb/ERA13LA129), Feb 7, 2013: Beech 58 (N458P), Winston-Salem, NC, substantial damage. Probable cause: The failure of the left main landing gear to fully extend due to improper rigging by maintenance personnel during a maintenance check.
- [NTSB CEN12WA547](https://openairdocs.org/ntsb/CEN12WA547), Sep 25, 2010: Beech D55 (N91HV), Cabo San Lucas, Mexico, substantial damage, 2 fatal

## 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.

- [Accident 20130207002769A](https://openairdocs.org/incident/20130207002769A), Feb 7, 2013: Beech 58 (N458P), Winston Salem, NC, Substantial damage. Acft landed rwy 33, left main landing gear collapsed. Aircraft made a sharp turn on twy c, skidded and came to stop txy a.
- [Incident 20080525840299I](https://openairdocs.org/incident/20080525840299I), May 25, 2008: Beech E55 (N508WB), Odessa, TX, Minor damage. (-23) On may 24, 2008, at approximately 1945 CDT, [privacy data omitted], private pilot [privacy data omitted], operated N508WB, a 1975 Beechcraft barron E55…

## Service difficulty reports (329, newest 50)

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

- [SDR 2023FA0000579](https://openairdocs.org/sdr/2023FA0000579), Sep 30, 2023: NUT. BACKED OUT. NOTICED A LOSS OF FUEL PRESSURE EN ROUTE. ELECTED TO LAND AT NEAREST SUITABLE AIRPORT. FOUND THAT THE MIXTURE CABLE SUPPORT NUT HAD BACKED OFF AND ALLOWED THE C
- [SDR 2022FA0000094](https://openairdocs.org/sdr/2022FA0000094), Feb 22, 2022: NONE. NONE. LEFT HAND ENGINE FAILURE # 2 CYC CONNECTING ROD BROKE LOOSE FROM CRANK AND PISTON CREATING A HOLE IN THE TOP OF THE CASE. CONNECTING ROD WAS FOUND LAYING ON THE
- [SDR Q6MR201908123003](https://openairdocs.org/sdr/Q6MR201908123003), Aug 4, 2019: ENGINE. SHUTDOWN. PILOT REPORTED LEFT ENGINE SHUT DOWN IN CRUISE FLIGHT. PILOT RETURNED TO DEPARTURE AIRPORT. MAINTENANCE INSPECTED THE ENGINE INCLUDING FUEL SYSTEM AND IGNITION 
- [SDR 2017FA0000346](https://openairdocs.org/sdr/2017FA0000346), Mar 13, 2017: ENGINE. POWER LOSS. AFTER 12 TO 15 MINUTES ON GROUND AND ENGINE RUN UP WITH NO INDICATIONS OF ANY PROBLEMS WITH ANY SYSTEMS, LEFT ENGINE HAD POWER LOSS WITHIN 1 TO 2 SECONDS AFTER 
- [SDR 2017FA0000048](https://openairdocs.org/sdr/2017FA0000048), Jan 18, 2017: GEARBOX. SEIZED. AIRCRAFT CALLED ON RADIO WITH GEAR PROBLEMS. TOLD TO CRANK GEAR WITH EMERGENCY HANDLE. UNABLE TO DO SO AND LANDED GEAR UP. AFTER LIFING AIRCRAFT AND DISCONNECTI
- [SDR 2015FA0000455](https://openairdocs.org/sdr/2015FA0000455), Sep 16, 2015: MAGNETO. BINDING. ROUGH RT ENGINE, LT MAGNETO OPERATION DURING RUN-UP CHECK. REMOVED MAGNETO, PN BL-349350-4, SN F11EA076R, MODEL S6RN-1225 AND FOUND MAGNETO GEAR BUSHING AND RET
- [SDR CA150601011](https://openairdocs.org/sdr/CA150601011), May 26, 2015: CABLE. LOOSE. (CAN) DURING A TRAINING FLIGHT, THE PILOTS NOTICED THAT THE WATER RUDDERS WERE NOT RESPONDING. THE ACFT FLEW TO THE MX FACILITY WHERE THEY LANDED UNEVENTFULLY &
- [SDR FQ5R2015032700001](https://openairdocs.org/sdr/FQ5R2015032700001), Feb 4, 2014: AHRS. UNKNOWN. WHILE AT CRUISE ALTITUDE OF 14,000FT, ON A VERY COLD DAY THE G500 PANEL FLAGGED THE AIRSPEED, ALTITUDE, AIS, OAT, HEADING AND HORIZON ALL "X" OUT WITH BIG RED X
- [SDR 2013FA0000443](https://openairdocs.org/sdr/2013FA0000443), Jun 14, 2013: GASKET. LEAKING. GASKETS LOCATED AT MOUNTING SURFACES OF BOTH MAGNETOS FOUND SHRUNK AND LEAKING OIL. GASKETS ARE ROUND AND HAD SHRUNK ENOUGH TO LEAVE A GAP OF .3750".
- [SDR EA39201303010001](https://openairdocs.org/sdr/EA39201303010001), Feb 7, 2013: LANDING GEAR. COLLAPSED. LT MLG COLLAPSED ON LANDING. GEAR INDICATOR SHOW ALL 3 GEARS DOWN & LOCKED BEFORE TOUCHDOWN. THE LT GEAR FOLDED IMMEDIATELY UPON TOUCHDOWN. INSPECTION OF MAIN G
- [SDR CA121108003](https://openairdocs.org/sdr/CA121108003), Oct 6, 2012: TANK. LEAKING. (CAN) LT WING TIP LENS FOUND CRACKED AND MISSING THEN REPLACED WITH P/N W-2501-L/H AND RETURNED TO SERVICE. DURING INSPECTION LIGHT BLUE STAINING WAS FOUND UNDE
- [SDR CA120919009](https://openairdocs.org/sdr/CA120919009), Sep 18, 2012: HUB. CRACKED. (CAN) PROPELLER LEAKING RED DYE. INSPECTION OF PROP FOUND CRACKED HUB.
- [SDR BSYA2012032](https://openairdocs.org/sdr/BSYA2012032), Aug 29, 2012: ENGINE. UNKNOWN. EN ROUT FROM PNE TO YXU, RIGHT ENGINE STARTED TO RUN ROUGH. PILOT DIVERTED AND LANDED SAFELY AT RDG WITHOUT INCIDENT. MAINTENANCE IS IN PROSSES OF INSPECTING RI
- [SDR 2012FA0000426](https://openairdocs.org/sdr/2012FA0000426), Jun 11, 2012: THROTTLE CABLE. BROKEN. PILOT REPORTED RT THROTTLE CABLE BROKE ON LANDING ROLL OUT, SHUTDOWN LT TO BETTER CONTROL ACFT THEN SHUTDOWN RT AS ACFT WAS UNDER CONTROL AND ROLLED TO STOP. IN
- [SDR EWKA2012040601](https://openairdocs.org/sdr/EWKA2012040601), Apr 2, 2012: CRANKSHAFT. CRACKED. CRANKSHAFT CRACKED AT PROPELLER FLANGE IN THE RADIUS. CRACK WAS IN A V SHAPE. ONE SIDE LINE WAS ABOUT 4 INCHES AND THE OTHER WAS ABOUT 3 INCHES.
- [SDR BSYA2012005](https://openairdocs.org/sdr/BSYA2012005), Jan 12, 2012: FUEL SYS. CONTAMINATED. ON TAKEOFF OUT OF RST, RIGHT ENGINE QUIT, ABORTED TAKEOFF AND RETURNED TO SIGNATURE RAMP. MAINTENANCE DRAINED WATER FROM FUEL SUMPS, RUN UP ENGINES, OPS CHECK N
- [SDR W59R2011112930999](https://openairdocs.org/sdr/W59R2011112930999), Nov 29, 2011: HUB. CRACKED. PROPELLER SUBMITTED FOR INSPECTION FOR THE CAUSE OF RED OIL LEAK IAW AD 91-15-04. PROPELLER WAS DISASSEMBLED AND BLADE RETENTION THREADS OF THE HUB SN 723369 WE
- [SDR 2011F00144](https://openairdocs.org/sdr/2011F00144), Jul 11, 2011: IMPULSE COUPLING. SEPARATED. IMPULSE COUPLING CAME APART AND FRACTURED THE MAG HOUSING.
- [SDR 2011FA0000247](https://openairdocs.org/sdr/2011FA0000247), Apr 8, 2011: DUCT. CHAFED. DURING ANNUAL INSP, FOUND THE RT ENGINE FUEL METERING UNIT BLAST DUCT CHAFING ON ENGINE MOUNT TUBE. FOUND THAT THE METAL WIRE IN THE BLAST DUCT HAD WORN THROUGH
- [SDR XGN2011F00007](https://openairdocs.org/sdr/XGN2011F00007), Mar 29, 2011: CYLINDER HEAD. CRACKED. NR 3 CYLINDER ON LT ENGINE HAD A COMPLETE HEAD SEPARATION CAUSED BY THE FAILURE OF THE AREA AROUND THE INTAKE VALVE. THIS AREA IS THE COMMON FAILURE FOR MFG REV
- [SDR XGN2011F00008](https://openairdocs.org/sdr/XGN2011F00008), Mar 29, 2011: CYLINDER. CRACKED. NR 1 CYLINDER ON LT ENGINE WAS CRACKED THRU THE HEAD ON THE TOP SIDE BETWEEN THE FINS ABOVE THE INTAKE VALVE. THIS IS ANOTHER DEFECTIVE REV NR 3 CYLINDER.
- [SDR CA110214008](https://openairdocs.org/sdr/CA110214008), Feb 3, 2011: ENGINE. FAILED. ABORTED T/O DURING ROUTINE TRAINING MISSION, ON THE 5TH TOUCH AND GO, SHORTLY AFTER TOUCHDOWN, THE MASTER CAUTION CAME WITH ENG SYS CONTROL LT AND RT FAIL. THE 
- [SDR 2010FA0001173](https://openairdocs.org/sdr/2010FA0001173), Oct 11, 2010: DRIVE GEAR. FAILED. (V7AR) DURING CRUISE FLIGHT THE RT ENGINE WENT TO 2700 RPM THEN DROPPED TO 1100 RPM. THE PILOT DID NOT NOTICE ANY OTHER GAGE READINGS. THE ENGINE STOPPED AND TH
- [SDR BSYA2010013](https://openairdocs.org/sdr/BSYA2010013), Mar 24, 2010: CONNECTING ROD. FAILED. AIRCRAFT EN ROUTE FROM LZU-CLT-ATL WHEN THE RIGHT ENGINE FAILED NR 6 ROD PENETRATED THE CASE. PILOT THEN DIVERTED TO AND, LANDED NO PROBLEMS. CAUSE UNKNOWN AT T
- [SDR CA090428005](https://openairdocs.org/sdr/CA090428005), Apr 27, 2009: HUB. UNSERVICEABLE. (CAN) PROP RECEIVED FOR REPAIR OF RED OIL LEAK. UPON VISUAL INSP CORROSION DAMAGE UNDER THE PAINT WAS OBSERVED. THE AMOUNT OF DAMAGE RENDERS THE HUB UNSERVICEAB
- [SDR 2009FA0000329](https://openairdocs.org/sdr/2009FA0000329), Apr 15, 2009: HINGE BRACKET. BROKEN. LOWER SUPPORTING ANGLE CRACKED FROM MANY YEARS AND HOURS OF FATIGUE. THIS ACFT HAS BEEN OPERATED ON UNIMPROVED BACK COUNTRY DIRT LANDING STRIPS WHICH POUND AND 
- [SDR BSYA2009010](https://openairdocs.org/sdr/BSYA2009010), Jan 28, 2009: LIGHT. INOPERATIVE. ON TAKEOFF OUT OF MKE LANDING GEAR WAS NOT RETRACTING, RETURNED TO MKE. MAINTENANCE FOUND OUT THAT IT WAS RETRACTING ALL THE WAY, BUT THE GEAR UP LIGHT WAS BURN
- [SDR BSYA2009008](https://openairdocs.org/sdr/BSYA2009008), Jan 27, 2009: ENGINE. DAMAGED. EN ROUTE FROM MKE TO STP, PILOT NOTICED LEFT ENGINE SLOWING DOWN AND OIL PRESSURE DROPPING. SHUT THE ENGINE DOWN AND DIVERTED TO MCN. MAINTENANCE FOUND NR 6 CYL
- [SDR BSYA2009009](https://openairdocs.org/sdr/BSYA2009009), Jan 27, 2009: KEY. OUT OF POSITION. GOING INTO CLE PILOT NOTICED CONTROL YOKE ROCKING BACK AND FORTH. MAINTENANCE FOUND LOCKING KEY HAD FALLEN OUT, REPLACED KEY OPS CHECKS GOOD.
- [SDR BSYA2009006](https://openairdocs.org/sdr/BSYA2009006), Jan 22, 2009: O-RING. DEFECTIVE. PILOT ABORTED TAKEOFF OUT OF TEB WHEN THE RIGHT ENGINE LOST 400 RPM. RETURNED TO RAMP, TRIED A HIGH POWER GROUND RUN, AFTER 10 SECONDS THE ENGINE STARTED SURGIN
- [SDR BSYA2009004](https://openairdocs.org/sdr/BSYA2009004), Jan 15, 2009: DOWNLOCK. OUT OF ADJUST. THE MANUAL NOSE GEAR DOWN AND LOCK MECHANICAL POINT WAS OUT OF ADJUSTMENT NOT SHOWING THE GEAR TO BE DOWN AND LOCKED. AIRCRAFT LANDED SAFELY. MAINTENANCE ADJUST
- [SDR BSYA2009003A](https://openairdocs.org/sdr/BSYA2009003A), Jan 14, 2009: CONNECTOR. LOOSE. EN ROUTE FROM GNV TO BHM PILOT NOTICED SPARKS FROM BEHIND INSTRUMENT PANEL. DIVERTED TO CSG. MAINTENANCE CHECKED OUT SUSPECTED AREA COULD NOT FIND ANY BURNT WIR
- [SDR 2008FA0000693](https://openairdocs.org/sdr/2008FA0000693), Sep 11, 2008: ROD. BROKEN. LIFT ROD WAS DISCOVERED BROKEN AT DISASSEMBLY. (K)
- [SDR FFKA128](https://openairdocs.org/sdr/FFKA128), Mar 31, 2008: STUD. BACKED OUT. PILOT ABORTED TAKEOFF AFTER SEEING SOME SMOKE COMING FROM THE LEFT ENGINE NACELLE. AFTER INVESTIGATION IT WAS FOUND THAT A STUD HAD BACKED OFF AND FELL OFF THE 
- [SDR BSYA20080004](https://openairdocs.org/sdr/BSYA20080004), Jan 24, 2008: SERVO. DEFECTIVE. BEFORE TAKEOFF OUT OF HFD THE RIGHT ENGINE WOULD NOT RUN AT LOW POWER WITHOUT THE BOOST PUMP BEING ON. MAINTENANCE CHANGED ENGINE DRIVEN FUEL PUMP, FLOW DIVIDER
- [SDR 2007FA0001111](https://openairdocs.org/sdr/2007FA0001111), Dec 17, 2007: THRU BOLT. BROKEN. INSTALLING ALL NEW SA641931-10.75 LOT NR K070059179, REV E THRU BOLTS IN ENGINE. AFTER TORQUE, WITHIN A FEW HOURS THE THRU BOLT SNAPPED, AT THE OIL RING GROOVE.
- [SDR 2007FA0001085](https://openairdocs.org/sdr/2007FA0001085), Nov 9, 2007: NOSE RIB. CRACKED. AT ANNUAL INSPECTION, FOUND CRACKED FLAP ROD ATTACH POINT RIB. RT FLAP ONLY. (K)
- [SDR GST2007F00000](https://openairdocs.org/sdr/GST2007F00000), Jun 13, 2007: GROUND WIRE. BROKEN. WHILE RETURNING, ON A REVENUE FLIGHT AND ARRIVING IN THE AIRPORT TRAFFIC PATTERN, THE GEAR HANDLE WAS SELECTED TO THE DOWN POSITION. PILOT HEARD THE GEAR EXTEND
- [SDR BOO2007F00000](https://openairdocs.org/sdr/BOO2007F00000), May 31, 2007: GEAR. WORN. CRANKSHAFT GEAR FAILURE. GEAR TEETH WORN OUT .5 WIDTH, CAUSED ENGINE FAILURE WHEN DRIVEN GEAR LOST CONTACT. (K)
- [SDR BOO2007F00001](https://openairdocs.org/sdr/BOO2007F00001), May 31, 2007: GEAR. WORN. CRANK SHAFT GEAR FAILURE. GEAR TEETH WORN OUT (.5) WIDTH CAUSED ENGINE FAILURE WHEN DRIVEN GEAR LOST CONTACT. (K)
- [SDR FFKA113](https://openairdocs.org/sdr/FFKA113), Dec 23, 2006: CYLINDER. CRACKED. PILOT REPORTED THAT AFTER AN HOUR AN HALF IN CRUISE FLIGHT THAT THE LEFT ENGINE EGT HAD FALLEN BELOW AN OPTIMUM LEVEL FOR CRUISE FLIGHT. TRIED TO ADJUST THE LEF
- [SDR BSYA200600030](https://openairdocs.org/sdr/BSYA200600030), Nov 9, 2006: INDICATOR. ERRATIC. AFTER TAKEOFF, ATTITUDE INDICATOR BECAME ERRATIC, RETURNED TO DEPARTURE WHERE MAINTENANCE REMOVED AND REPLACED ATTITUDE INDICATOR OPS CHECKS GOOD.
- [SDR 2006FA0001027](https://openairdocs.org/sdr/2006FA0001027), Oct 17, 2006: ROD. FAILED. CYLINDER NR 2 PISTON ROD FAILED WHILE AIRCRAFT WAS IN CRUISE FLIGHT. PROP WAS FEATHERED. AIRCRAFT LANDED WITHOUT INCIDENT. (K)
- [SDR BSYA200600025](https://openairdocs.org/sdr/BSYA200600025), Sep 18, 2006: SPARK PLUG. DIRTY. ONTAKE OFF OUT OF BHM LEFT ENGINE WOULD NOT ACCELERATE ABOVE 1800 RPM, ABORTED TAKEOFF. MAINTENANCE CLEANED FUEL NOZZLES AND REPLACED ONE SPARK PLUG, GROUND RUN
- [SDR XGN2007F00006](https://openairdocs.org/sdr/XGN2007F00006), Sep 16, 2006: CYLINDER HEAD. CRACKED. CYLINDER HEAD CRACKED IN THE EXHAUST AREA. (K)
- [SDR XGN2007F00008](https://openairdocs.org/sdr/XGN2007F00008), Sep 16, 2006: CYLINDER HEAD. CRACKED. CYLINDER HEAD CRACKED IN THE EXHAUST AREA. (K)
- [SDR XGN2007F00013](https://openairdocs.org/sdr/XGN2007F00013), Sep 16, 2006: CYLINDER. CRACKED. CYLINDER HEAD CRACKED IN THE EXHAUST AREA. (K)
- [SDR XGN2007F00014](https://openairdocs.org/sdr/XGN2007F00014), Sep 16, 2006: CYLINDER. CRACKED. CYLINDER HEAD CRACKED IN THE EXHAUST AREA. (K)
- [SDR 2006FA0000817](https://openairdocs.org/sdr/2006FA0000817), Aug 16, 2006: MAGNETO. SEPARATED. LT ENGINE OB MAGNETO IMPULSE COUPLING FROZE UP, CAUSING MAGNETO HOUSING TO COMPLETELY SEPARATE FROM ENGINE.
- [SDR XGN2006F00051](https://openairdocs.org/sdr/XGN2006F00051), May 24, 2006: CYLINDER. CRACKED. CYLINDER HEADS CRACKED IN THE EXHAUST PORT AREA. (K)

All 329: https://openairdocs.org/engine/continental-io-520-c/reports.md

## STCs that may be installed (OpenAirDocs) (52, first 50)

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 SE5583SW](https://openairdocs.org/stc/SE5583SW): Installation of fuel flow transducers (true-flow totalizer). Alcor LLC. Lists IO-520 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 SE03309CH](https://openairdocs.org/stc/SE03309CH): Installation of Engine Preheat Kit, p/n TSP6CYL-2927-115 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 SE09356SC](https://openairdocs.org/stc/SE09356SC): Install F & M Enterprises' Model C6LC, C6LC-S or C6LC-L oil filter adapter for a spin-on oil filter. Stratus Tool Technologies LLC
- [STC SE09217SC](https://openairdocs.org/stc/SE09217SC): Installation of modified fuel injector nozzles. General Aviation Modifications Inc
- [STC SE94WE](https://openairdocs.org/stc/SE94WE): Installation of oil fitting(AN-823-5D) in rocker box cover. Airwolf Filter Corporation
- [STC SE00115SE](https://openairdocs.org/stc/SE00115SE): Replaces Teledyne-Continental Part Number 646277 lifter bodies. B & B Aviation LLC
- [STC SE5785NM](https://openairdocs.org/stc/SE5785NM): Replacement of Teledyne Continental original camshaft with P/N 32122-2. B & B Aviation LLC
- [STC SE70RM](https://openairdocs.org/stc/SE70RM): Installation of compressor bracket. Air Comm Corporation
- [STC SE09637SC](https://openairdocs.org/stc/SE09637SC): Remove existing rocker arm assemblies and install modify rocker arm assemblies. General Aviation Modifications Inc
- [STC SE1186SW](https://openairdocs.org/stc/SE1186SW): Regrooving of pistons P/N 631475 or P/N 632585. Continental Motors, Inc
- [STC SE2340SW](https://openairdocs.org/stc/SE2340SW): Installation of modified cylinder assemblies, barrels, piston, and repaired crankcases. Continental Motors, Inc
- [STC SE34WE](https://openairdocs.org/stc/SE34WE): Installation of Electro-Coatings, Inc., piston rings on Continental pistons. Continental Motors, Inc
- [STC SE5820SW](https://openairdocs.org/stc/SE5820SW): Installation of Airmotive exhaust valve, P/N AEC-637781. Continental Motors, Inc. Lists IO-520 Series
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc
- [STC SE09979SC](https://openairdocs.org/stc/SE09979SC): Modification of Teledyne Continental Motors IO-520-B, IO-520-BA, or IO-520-BB engine to an Ultimate Engines IO-550-B/UE engine. General Aviation Modifications, Inc
- [STC SE01791LA](https://openairdocs.org/stc/SE01791LA): Conversion of the subject engines to incorporate modification of crankcase, replacing crankshaft assembly, main bearings, rod assembly, piston, fuel system, and fuel system adjustment. COLORADO AIR PARTS
- [STC SE3330NM](https://openairdocs.org/stc/SE3330NM): Continental valve cover gasket. Real Gaskets Tennessee
- [STC SE10746SC-D](https://openairdocs.org/stc/SE10746SC-D): Conversion of Teledyne Continental Motors (TCM) models IO-520-B, -BA, -BB to RAM model IO-550-B-RA engine, or conversion of TCM models IO-520-C, -CB to RAM model IO-550-C-RA engine. RAM Aircraft Limited Partnership
- [STC SE993SO](https://openairdocs.org/stc/SE993SO): Installation of fuel line filters into the individual fuel injector lines in accordance with Beryl D Shannon Aviation Specialties, Inc. Installations Instructions BI 2500, approved May 24, 1976, or later FAA approved revision. D'Shannon Products Ltd
- [STC SE267CH](https://openairdocs.org/stc/SE267CH): Installation of Slick Model 6309 and 6313 magnetos. Champion Aerospace LLC
- [STC SE7325SW-D](https://openairdocs.org/stc/SE7325SW-D): Installation of crankcase modifications. RAM Aircraft Limited Partnership
- [STC SE09846SC](https://openairdocs.org/stc/SE09846SC): Installation of S539800M30 starter adapter springs. Aircraft Specialties Services Inc
- [STC SE487GL](https://openairdocs.org/stc/SE487GL): Installation of a fuel flow transducer. Shadin Company Inc
- [STC SE02881AT](https://openairdocs.org/stc/SE02881AT): STC for the conversion of Teledyne Continental Motors (TCM) Models IO-520-B, -BA or -BB to AvPower Model IO-550-B-AP which has the same ratings and limitations as TCM Model IO-550-B, or the conversion of TCM Model IO-520-C or -CB to AvPower Model IO-550-C-AP which has the same ratings and limitations as TCM Model IO-550-C. Conversion of the Models IO-520-B, -BA, or -BB to the Model IO-550-B-AP shall be performed in accordance with AvPower Report AP1004-3 Master Parts List, Revision B dated March 26, 2004 and AvPower Report AP1004-6 Assembly Instructions, Revision B dated March 26, 2004, or later FAA approved revisions. Conversion of the Models IO-520-C or -CB to the Model IO-550-C-AP shall be performed in accordance with AvPower Report AP1004-4 Master Parts List, Revision B dated March 26, 2004 and AvPower Report AP1004-7 Assembly Instructions, Revision B dated March 26, 2004, or later FAA approved revisions. AERO Aviation Company
- [STC SE1780NM](https://openairdocs.org/stc/SE1780NM): Installation of Precise Flight 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 SE09997SC](https://openairdocs.org/stc/SE09997SC): Modification of Teledyne Continental Motors IO-520-B or IO-520-BA or IO-520-BB engine. Barrett Performance Aircraft. Lists IO-520 Series
- [STC SE09513SC](https://openairdocs.org/stc/SE09513SC): Installation and usage of Exxon 20W50 Multigrade aircraft engine oil conforming to Exxon Oil Formulation WS-3013. Exxon Company USA. Lists IO-520 Series
- [STC SE09559SC](https://openairdocs.org/stc/SE09559SC): Installation of US Airparts roller rocker arm assemblies P/N US92E exhaust and US92I intake. US Airparts, Inc
- [STC SE55WE](https://openairdocs.org/stc/SE55WE): Modification of fuel injection manifold valve P/N 626547 to the P/N 631427 or P/N 636326 configuration. AAR Aircraft Services Inc. d/b/a AAR Aircraft Services-Oklahoma. Lists IO-520 Series
- [STC SE09319SC](https://openairdocs.org/stc/SE09319SC): Modify oil pan adding a new oil sump drain. Texas Skyways Inc. Lists IO-520 Series
- [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector. Aviation Development Corporation
- [STC SE00143SE](https://openairdocs.org/stc/SE00143SE): Replaces the following Teledyne-Continental part numbers: 641682 (Rocker Arm, Exhaust), 539742 (Rocker Arm, Intake), 539740 (Rocker Arm, Shaft) and 538304 (Pushrod Assembly). Dakota Aircraft Parts Inc
- [STC SE8687SW](https://openairdocs.org/stc/SE8687SW): Regrooving of pistons P/N 631475 or P/N 632585. Capehart Industries, Inc. Lists IO-520 Series
- [STC SE00005DE](https://openairdocs.org/stc/SE00005DE): Installation of engine oil filter adapter compatable with SA4094NM Oilamatic, Inc. engine preoiling system. Oilamatic Inc
- [STC SE8594SW](https://openairdocs.org/stc/SE8594SW): Installation of roller rocker arm P/N PE 92I intake and PE92E exhaust. Performance Engineering
- [STC SE7422SW](https://openairdocs.org/stc/SE7422SW): Installation of Performance Engineering roller rocker arms. Performance Engineering
- [STC SE2197CE](https://openairdocs.org/stc/SE2197CE): Add the following approved fuel: leaded & unleaded automotive gasoline 91 minimum antiknock index (RON+MON)/2. Intermixing with aviation gasoline also approved. Petersen Aviation Inc
- [STC SE3812SW](https://openairdocs.org/stc/SE3812SW): Recontouring and polishing(porting) of intake manifold and exhaust parts and air flow balancing. High Performance Aircraft. Lists IO-520 Series
- [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp. Lists IO-520 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 IO-520 Series
- [STC SE244NE](https://openairdocs.org/stc/SE244NE): Installation of Mattituck plasma flame sprayed cylinder barrels in Teledyne reciprocating engines. Mattituck Airbase, Inc. Lists IO-520 Series
- [STC SE80NE](https://openairdocs.org/stc/SE80NE): Installation and usage of Bel-Ray synthetic aviation oil, Bel-Ray Aero 1, (nonsupercharged), horizontally opposed direct drive, aircraft engines of 350 hp. or less. Bel-Ray Company, Inc. Lists IO-520 Series
- [STC SE1445SO](https://openairdocs.org/stc/SE1445SO): Use of Aero-blend oil additive in Teledyne (non turbocharged) aircraft engines. ProTec. Lists IO-520 Series
- [STC SE72WE](https://openairdocs.org/stc/SE72WE): BG-341 spark plug as eligible for installation on listed Continental engines. Lewis Leibee
- [STC SE44WE](https://openairdocs.org/stc/SE44WE): Use of Kling Aviation Oil, Specifications KL-100, KL-200 and KL-300 in Continental and Lycoming engines. Kling Oil Company

All 52: https://openairdocs.org/engine/continental-io-520-c/stcs.md

---
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.