# Continental IO-520-L

- Type: Engine model (FAA registry)
- Registry code: 17239
- Manufacturer (registry): CONT MOTOR
- Model: IO-520-L
- Engine type: Reciprocating
- Power: 300 hp
- Data sheet: [TCDS E5CE](https://openairdocs.org/tcds/E5CE) (OpenAirDocs)
- Holder: Continental Aerospace Technologies, Inc.
- Installed in: 11 registered aircraft
- Page: https://openairdocs.org/engine/continental-io-520-l

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 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 77-05-04](https://openairdocs.org/ad/77-05-04): Crankshaft · Continental Motors IO-470-L, IO-520-D, IO-520-F and 6 more. Effective Mar 11, 1977
- [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 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) (10)

- [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

## Registered aircraft (11)

- [N17GN](https://openairdocs.org/aircraft/N17GN): [Grant Aviation Inc](https://openairdocs.org/faa-owner/GRANT%20AVIATION%20INC), [Anchorage, AK](https://openairdocs.org/faa-place/AK/Anchorage), built 1981, S/N 20700693
- [N206GK](https://openairdocs.org/aircraft/N206GK): [Jls Alaska LLC](https://openairdocs.org/faa-owner/JLS%20ALASKA%20LLC), [Palmer, AK](https://openairdocs.org/faa-place/AK/Palmer), built 1981, S/N U20606100
- [N210BV](https://openairdocs.org/aircraft/N210BV): [Plane Fun Inc Tr Trustee](https://openairdocs.org/faa-owner/PLANE%20FUN%20INC%20TR%20TRUSTEE), [Snellville, GA](https://openairdocs.org/faa-place/GA/Snellville), built 1975, S/N 21061114
- [N210M](https://openairdocs.org/aircraft/N210M): built 1976, S/N 21061600
- [N333LH](https://openairdocs.org/aircraft/N333LH): [Koelbl Aviation LLC](https://openairdocs.org/faa-owner/KOELBL%20AVIATION%20LLC), [Whitesboro, TX](https://openairdocs.org/faa-place/TX/Whitesboro), built 1981, S/N 21064220
- [N356WB](https://openairdocs.org/aircraft/N356WB): [Mwm Interests Inc](https://openairdocs.org/faa-owner/MWM%20INTERESTS%20INC), [The Woodlands, TX](https://openairdocs.org/faa-place/TX/The%20Woodlands), built 2009, S/N 261
- [N41YY](https://openairdocs.org/aircraft/N41YY): [Southern Aircraft Consultancy Inc Trustee](https://openairdocs.org/faa-owner/SOUTHERN%20AIRCRAFT%20CONSULTANCY%20INC%20TRUSTEE), [Casper, WY](https://openairdocs.org/faa-place/WY/Casper), built 1980, S/N 21063653
- [N481J](https://openairdocs.org/aircraft/N481J): [Collins Jason](https://openairdocs.org/faa-owner/COLLINS%20JASON), [Mansfield, OH](https://openairdocs.org/faa-place/OH/Mansfield), built 1977, S/N 21061580
- [N54R](https://openairdocs.org/aircraft/N54R): [Aerometrix LLC](https://openairdocs.org/faa-owner/AEROMETRIX%20LLC), [Lawrence, KS](https://openairdocs.org/faa-place/KS/Lawrence), built 1981, S/N 21064514
- [N63ET](https://openairdocs.org/aircraft/N63ET): [Nelson Edward T](https://openairdocs.org/faa-owner/NELSON%20EDWARD%20T), [Silver Springs, FL](https://openairdocs.org/faa-place/FL/Silver%20Springs), built 1999, S/N 07-265
- [N99TM](https://openairdocs.org/aircraft/N99TM): [Magdabenja Holdings LLC](https://openairdocs.org/faa-owner/MAGDABENJA%20HOLDINGS%20LLC), [Corona, CA](https://openairdocs.org/faa-place/CA/Corona), built 1977, S/N 21061712

## 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 CEN14LA076](https://openairdocs.org/ntsb/CEN14LA076), Nov 27, 2013: Cessna T210L (N21ME), Lake Providence, LA, substantial damage. Probable cause: The pilot's mismanagement of available fuel and incorrect use of the fuel boost pump which resulted in a total loss of engine power at a low altitude.
- [NTSB ANC08LA111](https://openairdocs.org/ntsb/ANC08LA111), Aug 23, 2008: Cessna 207A (N17GN), Kongiganak, AK, substantial damage. Probable cause: The pilot's decision to attempt to takeoff on a short, wet runway with a heavily loaded airplane, and his failure to abort the takeoff before it became impracticable.

## FAA accident and incident reports (4)

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 20131127024499A](https://openairdocs.org/incident/20131127024499A), Nov 27, 2013: Cessna T210L (N21ME), Oak Grove, LA, Substantial damage. Pilot departed tallulah la for Oak Grove la. At 1000 feet with left fuel tank selected, engine started running rough. Pilot immediately switched to right tank,…
- [Accident 20080822845879A](https://openairdocs.org/incident/20080822845879A), Aug 22, 2008: Cessna 207A (N17GN), Kongiganak, AK, Substantial damage. (-23) On August 22, 2008, about 1815 Alaska daylight time, a Cessna 207 airplane, N17GN, operated by hageland aviation, anchorage, Alaska, as scheduled…
- [Incident 20000207000329I](https://openairdocs.org/incident/20000207000329I), Feb 7, 2000: Cessna 210M (N1781M), Bessemer, AL. (-23) Pilot was flying a Cessna 210 for air carriers, inc. on a repositioning flight from albany, Georgia to valdosta, Georgia. The flight departed albany and…
- [Incident 19981026034029I](https://openairdocs.org/incident/19981026034029I), Oct 26, 1998: Cessna 210M (N1781M), Marthas Vineyar, MA, Minor damage. At approximately 0910, this office received a call from the FAA communications center regarding a Cessna 210 that landed in a field 3 miles south of the…

## Service difficulty reports (257, newest 50)

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

- [SDR 2022FA0000229](https://openairdocs.org/sdr/2022FA0000229), Oct 20, 2021: NONE. NONE. ON TAKE OFF, AIRCRAFT EXPERIENCED A LOSS OF POWER AND THE PILOT ABORTED THE TAKE OFF. INSPECTION OF THE AIRCRAFT DID NOT SHOW ANY IRREGULARITIES. ENGINE HAD COM
- [SDR CA190308025](https://openairdocs.org/sdr/CA190308025), Mar 6, 2019: CYLINDER. CRACKED. (CAN) OIL NOTED ON LOWER COWLING, INSPECTION SHOWED OIL LEAKING FROM PUSHROD HOUSING ON NR 1 CYLINDER. PART REMOVED AND FOUND TO BE CRACKED AROUND 50% OF ITS CI
- [SDR EPUA20180122001](https://openairdocs.org/sdr/EPUA20180122001), Jan 22, 2018: LINE. LOOSE. PILOT REPORTS FUEL LEAKING FROM REAR OF ENGINE COMPARTMENT. MAINTENANCE TIGHTENED LOOSE FUEL LINE BETWEEN ENGINE DRIVE FUEL PUMP AND FUEL CONTROL. GROUND RUN RE
- [SDR CA150727016](https://openairdocs.org/sdr/CA150727016), Jul 21, 2015: POWERPACK. FAULTY. (CAN) ON TAKEOFF WHEN THE LANDING GEAR WAS RETRACTED THE LANDING GEAR HYDRAULIC POWER PACK CONTINUED TO RUN EVERY 10 SECONDS. WHEN GEAR DOWN WAS SELECTED THE FR
- [SDR CA150716008](https://openairdocs.org/sdr/CA150716008), Jul 4, 2015: RIB. CRACKED. (CAN) DURING A 100 HR INSPECTION A CRACK WAS FOUND ON THE TOP SKIN OF THE L/H HORIZONTAL STABILIZER P/N 1232600-29 LEADING EDGE COMING FROM ONE OF THE RIVETS AT
- [SDR CA150716009](https://openairdocs.org/sdr/CA150716009), Jul 4, 2015: PUMP. FAILED. (CAN) DURING A ROUTINE LANDING, AFTER TOUCHDOWN, AS THE AIRCRAFT WAS SLOWING THE ENGINE STOPPED. THE PILOT RESTARTED THE ENGINE AND TAXIED OFF THE RUNWAY TO HIS
- [SDR CA150703012](https://openairdocs.org/sdr/CA150703012), Jun 27, 2015: MAGNETO. FAULTY. (CAN) DURING GROUND RUN FOR INSPECTION MAG DROP WAS EXCESSIVE. BENDIX MAGNETOS PN 10-500556-1, 1264.8 TSOH & PN BL-500556-1, 325.8. TSOH R & R WITH NEW PN 6310 
- [SDR CA150611005](https://openairdocs.org/sdr/CA150611005), May 15, 2015: ALTIMETER. STICKS. (CAN) ALTIMETER NEEDLE WAS OBSERVED JUMPING AROUND +- 300 FT ON CLIMB OUT. PITOT & STATIC CHECK CARRIED OUT LATER & IT WAS FOUND THAT NEEDLE WAS STICKING. SERVI
- [SDR BSYA201401](https://openairdocs.org/sdr/BSYA201401), Jan 9, 2014: ENGINE. POWER LOSS. 20 MILES FROM ADS, PILOT NOTICED LOSING POWER FROM THE ENG & STARTED FLUTTERING & MISFIRING. PILOT DECLARED AN EMERGENCY WITH ADS TOWER. PILOT WAS ABLE TO KEEP 
- [SDR BSYR20131128001](https://openairdocs.org/sdr/BSYR20131128001), Nov 28, 2013: ENGINE. POWER LOSS. EN ROUTE FROM TEB TO BUF, ENG LOST ALL POWER. PILOT ATTEMPTED TO LAND ON A ROAD, IN PROCESS, ACFT CLIPPED A POWER LINE & CRASHED NEAR SR 706 IN MONTROSE PA. PIL
- [SDR 2013FA0000634](https://openairdocs.org/sdr/2013FA0000634), Nov 15, 2013: PLUG. FAILED. AT CRUISE 6500 FT, NR 3 PISTON PIN ALUMINUM END PLUG BROKE OFF THE STEEL PIN. THIS CAUSED DAMAGE TO THE PISTON, RINGS, CYLINDER AND ULTIMATELY STOPPED THE ENGIN
- [SDR CA130724006](https://openairdocs.org/sdr/CA130724006), Jul 23, 2013: HOSE. WORN. (CAN) DURING INSPECTION, FOUND ONE OF THE OIL COOLER HOSE RUBBING ON THE RT MUFFLER. HOSE WAS REMOVED AND HAD CHAFED DOWN TO THE METAL BRAIDING. NO LEAKS, NEW H
- [SDR CA130522008](https://openairdocs.org/sdr/CA130522008), May 14, 2013: PULLEY. LOOSE. (CAN) DURING TAXI A SQUEEL WAS HEARD FROM THE ENGINE. AFTER SHUTDOWN PILOT OBSERVED THAT PULLY WAS LOOSE ON FRONT ALTERNATOR, 2. THE PULLY HAD BEEN RUBBING ON A
- [SDR CCJA201306280001](https://openairdocs.org/sdr/CCJA201306280001), Mar 12, 2013: GEAR. FAILED. DURING GROUND OPERATION, CAM SHAFT GEAR BROKE TWO TEETH. MOTOR AND DIRECTLY RELATED ACCESSORIES WERE REMOVED AND O/H. IT WAS UNDETERMINED BY THE O/H SHOP, THE C
- [SDR 5RJR2013020811562](https://openairdocs.org/sdr/5RJR2013020811562), Jan 25, 2013: CRANKCASE. CONTAMINATED. ACFT ON RAMP OVERNIGHT 0-10 FARENHEIT. OPERATOR HAD HARD TIME STARTING ENGINE. AIRCRAFT WARMED UP. LATER STARTED NORMAL. CREW TOOK OFF NORMAL. ABOUT 15-20 MINUT
- [SDR FPI2012F00010](https://openairdocs.org/sdr/FPI2012F00010), Jun 29, 2012: CYLINDER. LEAKING. DURING A 100 HOUR INSPECTION, COMPRESSION TEST LEAK CHECK WITH SOAPY WATER, A CRACK WAS FOUND AT FIRST FIN, INTO COMBUSTION CHAMBER. REPLACED WITH NEW CYLINDER 
- [SDR FPI2012F00011](https://openairdocs.org/sdr/FPI2012F00011), Jun 29, 2012: CYLINDER HEAD. CRACKED. DURING 100 HR INSPECTION, COMPRESSION TEST, LEAK CHECK WITH SOAPY WATER FOUND A CRACK IN CYLINDER HEAD FROM TOP OF SPARK PLUG HOLE TO INTAKE VALVE. REPLACED WIT
- [SDR FPI2012F00008](https://openairdocs.org/sdr/FPI2012F00008), Jun 9, 2012: CYLINDER HEAD. CRACKED. DURING A 100 HR INSPECTION/ COMPRESSION TEST/ BUBBLE LEAK CHECK FOUND NR 2 CYCLE POSITION HEAD CRACKED INTO THE COMBUSTION CHAMBER - CYLINDER ASSY.
- [SDR FPI2012F00009](https://openairdocs.org/sdr/FPI2012F00009), May 9, 2012: CYLINDER HEAD. CRACKED. DURING A 100 HR INSPECTION/ COMPRESSION TEST/ BUBBLE LEAK CHECK, FOUND NR 4 CYLINDER POSITION HEAD CRACKED INTO THE COMBUSTION CHAMBER- REPLACED CYLINDER ASSY.
- [SDR FPI2012F00006](https://openairdocs.org/sdr/FPI2012F00006), May 3, 2012: CYLINDER HEAD. CRACKED. DURING A 100 HR INSPECTION, COMPRESSION TEST AND SOAP BUBBLE TEST FOR CRACKS FOUND THE NR 6 CYLINDER HEAD CRACKED INTO THE COMBUSTION CHAMBER LEAKING COMPRESSED
- [SDR CA120425001](https://openairdocs.org/sdr/CA120425001), Apr 24, 2012: PISTON. LEAKING. (CAN) ACFT RETURNED AFTER FLIGHT WITH ENGINE OIL SPATTERED ON WINDSCREEN. REMOVED PROPELLER DOME TO DISCOVER ENGINE OIL ON FRONT OF PROPELLOR HUB. PROP SHOP SAY
- [SDR FPI2012F00007](https://openairdocs.org/sdr/FPI2012F00007), Apr 11, 2012: CYLINDER HEAD. CRACKED. DURING A 100 HR INSP, COMPRESSION TEST AND SOAP BUBBLE TEST FOR CRACKS FOUND NR 1 CYLINDER HEAD CRACKED.
- [SDR FPIA2012F00004](https://openairdocs.org/sdr/FPIA2012F00004), Mar 2, 2012: CYLINDER. CRACKED. DURING A 100 HR INSPECTION-COMPRESSION TEST, FOUND NR 3 CYLINDAER AND NR 5 CYLINDER HEAD CRACKED AT THE TOP OF CYLINDER SLEEVE AT EXHAUST PORT 4 TO 6 INCHES LON
- [SDR FPI2012F00005](https://openairdocs.org/sdr/FPI2012F00005), Mar 2, 2012: CYLINDER. CRACKED. DURING A 100 HR INSPECTION-COMPRESSION TEST, FOUND NR 3 CYLINDAER AND NR 5 CYLINDER HEAD CRACKED AT THE TOP OF CYLINDER SLEEVE AT EXHAUST PORT 4 TO 6 INCHES LON
- [SDR FPI2012F00003](https://openairdocs.org/sdr/FPI2012F00003), Feb 21, 2012: CYLINDER. BROKEN. DURING A 100 HOUR INSPECTION, FOUND NR 1 CYLINDER COOLING FIN BROKEN OFF, LEFT OF TOP SPARK PLUG DOWN TO HEAD OF CYLINDER. NO DAMAGE HISTORY NOTED. REPLACED WIT
- [SDR FPI2012F00002](https://openairdocs.org/sdr/FPI2012F00002), Jan 3, 2012: CYLINDER. CRACKED. DURING A 100 HR INSP COMPRESSION TEST, FOUND NR 2 CYLINDER HEAD CRACKED FROM 1ST FIN INBD OF UPPER SPARK PLUG OVER EXHAUST VALVE TO UPPER SPARK PLUG HOLE USING 
- [SDR FPI2012F00000](https://openairdocs.org/sdr/FPI2012F00000), Dec 20, 2011: CYLINDER HEAD. CRACKED. DURING A 100 HR INSP, COMPRESSION TEST FOUND NR 1 CYLINDER HEAD CRACKED ABOVE EXHAUST VALVE TO SPARK PLUG UPPER USING SOAP WATER SOLUTION DURING COMPRESSION TES
- [SDR FPI2012F00001](https://openairdocs.org/sdr/FPI2012F00001), Dec 14, 2011: CYLINDER. CRACKED. DURING A 100 HR INSPECTION COMPRESSION TEST FOUND NR 1 CYLINDER CRACKED FROM BEHIND FIRST FIN TO SPARK PLUG HOLE (UPPER) ABOVE EXHAUST PORT. REPLACED WITH NEW C
- [SDR FPI2011F00010](https://openairdocs.org/sdr/FPI2011F00010), Oct 28, 2011: CYLINDER HEAD. CRACKED. DURING A 100 HR INSPECTION, FOUND NR1 CYLINDER CRACKED BETWEEN THE COOLING FINS OF THE EASTHEAD ABOVE THE INTAKE PORT BEHIND FUEL NOZZLE PORT.
- [SDR FPI2011F00008](https://openairdocs.org/sdr/FPI2011F00008), Oct 13, 2011: IMPULSE COUPLING. FAILED. DURING INVESTIGATIONOF REPORTED MAGNETO FAIL, REMOVED LT & RT MAGS AND FOUND LT MAGNETO IMPULSE COUPLING DRIVE PADS AND CAGE WERE BROKEN. DISASSEMBLED LT MAG AN
- [SDR FPI2011F00009](https://openairdocs.org/sdr/FPI2011F00009), Oct 12, 2011: CYLINDER. CRACKED. CURING A 100 HR INSPECTION, FOUND NR1 CYLINDER CRACKED FROM FUEL NOZZLE TO SPARK PLUG PORT. REPLACED CYLINDER ASSY.
- [SDR 2011FA0000543](https://openairdocs.org/sdr/2011FA0000543), Aug 11, 2011: ALTERNATOR. FAILED. ALTERNATOR COOLING FAN CAME APART IN FLIGHT AFTER TAKEOFF. PART OF COOLING FAN PUNCHED A HOLE IN INDUCTION AIR BOX DOWN STREAM OF AIR FILTER AND THE ALTERNATOR 
- [SDR FPI2011F00002](https://openairdocs.org/sdr/FPI2011F00002), Jul 20, 2011: CYLINDER. CRACKED. DURING A 100 HR INSPECTION FOUND THE CYLINDER HEAD WAS CRACKED FROM THE FUEL INJECTOR PORT TO THE UPPER SPARK PLUG BY VISUAL INSPECTION. DURING COMPRESSION TEST
- [SDR FPI2011F00003](https://openairdocs.org/sdr/FPI2011F00003), Jul 20, 2011: CYLINDER. CRACKED. DURING A 100 HR INSPECTION FOUND THE CYLINDER AHEAD WAS CRACKED FROM THE FUEL INJECTOR PORT TO THE UPPER SPARK PLUG BY VISUAL INSPECTION. DURING COMPRESSION TES
- [SDR FPI2011F00004](https://openairdocs.org/sdr/FPI2011F00004), Jul 20, 2011: CYLINDER. CRACKED. DURING A 100 HR INSPECTION FOUND THE CYLINDER AHEAD WAS CRACKED FROM THE FUEL INJECTOR PORT TO THE UPPER SPARK PLUG BY VISUAL INSPECTION. DURING COMPRESSION TES
- [SDR FPI2011F00005](https://openairdocs.org/sdr/FPI2011F00005), Jul 20, 2011: CYLINDER. CRACKED. DURING A 100 HR INSPECTION FOUND THE CYLINDER AHEAD WAS CRACKED FROM THE FUEL INJECTOR PORT TO THE UPPER SPARK PLUG BY VISUAL INSPECTION. DURING COMPRESSION TES
- [SDR FPI2011F00006](https://openairdocs.org/sdr/FPI2011F00006), Jul 20, 2011: CYLINDER. CRACKED. DURING A 100 HR INSPECTION FOUND THE CYLINDER AHEAD WAS CRACKED FROM THE FUEL INJECTOR PORT TO THE UPPER SPARK PLUG BY VISUAL INSPECTION. DURING COMPRESSION TES
- [SDR FPI2011F00007](https://openairdocs.org/sdr/FPI2011F00007), Jul 20, 2011: CYLINDER. CRACKED. DURING A 100 HR INSPECTION, COMPRESSION TEST USING SOAPY WATER, BUBBLES CAME FROM CYLINDER HEAD COOLING FINS ABOVE EXHAUST PORT. NO VISUAL CRACKS NOTED.
- [SDR CA110620007](https://openairdocs.org/sdr/CA110620007), Jun 20, 2011: GASKET. BROKEN. PILOT REPORTED THAT HE HAD SOME OIL ON RT PART OF WINDSHIELD. DISCOVERED THAT THE OIL COOLER ADAPTER GASKET ON RT FWD OF ENGINE HAD A HAIR LINE OPENING OR SPLIT
- [SDR O592011F00002](https://openairdocs.org/sdr/O592011F00002), May 3, 2011: CYLINDER HEAD. CRACKED. NR 1 CYLINDER WAS FOUND CRACKED BETWEEN SPARK PLUG HOLE AND INTAKE VALVE. THIS IS THE 3RD CYLINDER WITH SIMILAR CRACK.
- [SDR FPI2011F00000](https://openairdocs.org/sdr/FPI2011F00000), Apr 11, 2011: GASKET. FAILED. DURING A SCHEDULED INSPECTION OF ENGINE, FOUND 5 OUT OF 5 INDUCTION GASKETS LEAKING. AFTER REMOVING INTAKE TUBES, OBSERVED THAT THE GASKETS WERE CRACKED AND TOR
- [SDR FPI2011F00001](https://openairdocs.org/sdr/FPI2011F00001), Mar 30, 2011: SHAFT. OUT OF POSITION. RECEIVED NEW FUEL SELECTOR SHAFT AND WAS FOUND TO BE ASSEMBLED 180 DEGREES OUT. THE HANDLE TO SELECT FUEL TANK POINTS TO THE OPPOSITE TANK OF WHICH IS BEING USE
- [SDR 2010FA0001157](https://openairdocs.org/sdr/2010FA0001157), Oct 21, 2010: CYLINDER HEAD. CRACKED. DURING AN ANNUAL/100HR INSP FOUND 4 OUT OF THE 6 CYLINDER HEADS CRACKED, THEY ARE ECI CYLINDERS WITH PN TIST71.4, SN'S 38519-08, 38542-17, 38947-18, 38947-30.
- [SDR CA101018013](https://openairdocs.org/sdr/CA101018013), Oct 15, 2010: SWITCH. FAILED. SNAG: LANDING LIGHT SWITCH TO VERIFY, LANDING LIGHT SWITCH (1) PN: TA-201-TW-B. REPLACED NEW IAW SB SEB09-6 (DUE SPARKING COMING OUT THROUGH KNOB WHEN PUTTING S
- [SDR CA100719005](https://openairdocs.org/sdr/CA100719005), Jul 14, 2010: FASTENER. MISSING. (CAN) UPON TAXI, PILOT NOTICED RIGHT MAIN WHEEL LOCKED UP DURING TAXI. MAINTENANCE WAS DISPATCHED AND UPON INVESTIGATION WAS FOUND THAT RIGHT MAIN WHEEL ASSEMBL
- [SDR FPI2010F00001](https://openairdocs.org/sdr/FPI2010F00001), Jun 18, 2010: SPRING. INOPERATIVE. ENGINE WAS REMOVED FOR INTERNAL VIBRATION AND REPAIRED BY MFG. REPLACED CRANKSHAFT ENGINE, REINSTALLED IN ACFT. AFTER APPROXIMATELY 16 CYCLES, THE STARTER WAS E
- [SDR 2010FA0000336](https://openairdocs.org/sdr/2010FA0000336), Apr 12, 2010: BAFFLE. BROKEN. (M2ZR) FOLLOWING TAKEOFF, PILOT DETECTED AN UNUSUAL ENGINE SOUND ACCOMPANIED BY LOSS OF ENGINE POWER. PILOT RETURNED TO AIRPORT, LANDING DOWNWIND ON A TAXI WAY.
- [SDR CA090929003](https://openairdocs.org/sdr/CA090929003), Sep 27, 2009: LANDING GEAR. OBSTRUCTED. (CAN) UPON APPROACH, PILOT SELECTED MLG DOWN, & DID NOT GET A MLG DOWN INDICATION & HYDRAULIC MOTOR DID NOT SHUT-OFF. PILOT PULLED MLG CIRCUIT BREAKER & USED EM
- [SDR CA090622020](https://openairdocs.org/sdr/CA090622020), Jun 19, 2009: EXHAUST VALVE. STUCK. (CAN) ACFT WAS UNDERGOING A 50 HR INSP. INSP REVEALED AN OIL LEAK ON RT SIDE OF ENG. INVESTIGATION REVEALED EXHAUST PUSH TUBE SEALS WERE LEAKING. REMOVAL OF THE
- [SDR CA090430001](https://openairdocs.org/sdr/CA090430001), Apr 16, 2009: MOTOR. OVERHEATED. (CAN) DURING CRUISE ALTERNATOR NR 1 WENT "OFF LINE", IMMEDIATELY NR 2 WENT OFF AS WELL. LARGE ELEC PWR DRAW ON AMMETER NOTICED, STRONG ODOR & SMOKE NOTED FROM L

All 257: https://openairdocs.org/engine/continental-io-520-l/reports.md

## STCs that may be installed (OpenAirDocs) (54, 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 SE03704AT](https://openairdocs.org/stc/SE03704AT): Convert Continental Motors IO-520-A, -D, -E, -F and -L engine to Vitatoe Aviation, LLC IO-520-A-CF, -D-CF, -E-CF, -F-CF or -L-CF engine in accordance with Master Parts List PL2008-7 Rev. C dated August 2, 2018 or later FAA approved revision and Assembly Instructions PL2008-13 Rev C. dated August 2, 2018 or later FAA approved revision. Vitatoe Aviation 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 SE0417CH](https://openairdocs.org/stc/SE0417CH): Turbo-normalization. Western Skyways Aircraft Modifications Inc
- [STC SE00115SE](https://openairdocs.org/stc/SE00115SE): Replaces Teledyne-Continental Part Number 646277 lifter bodies. B & B Aviation LLC
- [STC SE5784NM](https://openairdocs.org/stc/SE5784NM): Replacement of Teledyne Continental original camshaft. B & B Aviation LLC
- [STC SE03415CH](https://openairdocs.org/stc/SE03415CH): The turbo-normalization of Continental Motors engine models IO-520-A, -F, -J, and -L, TSIO-520-C, -G, -H, -M, and -R, and IO-550-F and L for installation into Cessna 206, 207 & 210 aircraft. DERS Group Svc LLC
- [STC SE70RM](https://openairdocs.org/stc/SE70RM): Installation of compressor bracket. Air Comm Corporation
- [STC SE2068NM](https://openairdocs.org/stc/SE2068NM): Remove fuel injection system, install Marvel Schebler carburetor system and revise operating limits as shown in addendum SE2068NM. Kenmore Air Harbor LLC
- [STC SE09637SC](https://openairdocs.org/stc/SE09637SC): Remove existing rocker arm assemblies and install modify rocker arm assemblies. General Aviation Modifications Inc
- [STC SE03187AT](https://openairdocs.org/stc/SE03187AT): STC for the conversion of Teledyne Continental Motors (TCM) Models IO-520-D, -E, -F, or -L to the respective PowerLite Models IO-550-D-AP, -E-AP, -F-AP, or -L-AP which have the same ratings and limitations as TCM Models IO-550-D, -E, -F, or -L, respectively. Vitatoe Aviation LLC
- [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 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 SE3330NM](https://openairdocs.org/stc/SE3330NM): Continental valve cover gasket. Real Gaskets Tennessee
- [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 SE443GL](https://openairdocs.org/stc/SE443GL): Incorporation of a fuel flow transducer. Shadin Avionics
- [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 SE00577NY](https://openairdocs.org/stc/SE00577NY): Installation of Canadian Aero Mfg. (C.A.M.) Oil Coolers. Canadian Aero Manufacturing
- [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 SE00427NY](https://openairdocs.org/stc/SE00427NY): Installation, operation and inspection of CAM oil coolers. Canadian Aero Manufacturing
- [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 SE4314NM](https://openairdocs.org/stc/SE4314NM): Replacement of the original engine oil screen with an external mounted full flow oil adapter & spin-on filter. Timberman Allen E
- [STC SE8594SW](https://openairdocs.org/stc/SE8594SW): Installation of roller rocker arm P/N PE 92I intake and PE92E exhaust. Performance Engineering
- [STC SE400NE](https://openairdocs.org/stc/SE400NE): Installation of Auto-vac-2 instrument vacuum system. Raymond Ives
- [STC SE7422SW](https://openairdocs.org/stc/SE7422SW): Installation of Performance Engineering roller rocker arms. Performance Engineering
- [STC SE938GL](https://openairdocs.org/stc/SE938GL): Installation of oil filler tube extension. Rapco, Inc
- [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

All 54: https://openairdocs.org/engine/continental-io-520-l/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.