# Continental IO-520-A - Type: Engine model (FAA registry) - Registry code: 17227 - Manufacturer (registry): CONT MOTOR - Model: IO-520-A - Engine type: Reciprocating - Power: 285 hp - Data sheet: [TCDS E5CE](https://openairdocs.org/tcds/E5CE) (OpenAirDocs) - Holder: Continental Aerospace Technologies, Inc. - Installed in: 8 registered aircraft - Page: https://openairdocs.org/engine/continental-io-520-a 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 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 80-06-05](https://openairdocs.org/ad/80-06-05): Magnetos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 254 more. Effective Mar 28, 1980 - [AD 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 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 94-14-12](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) (9) - [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-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 (8) - [N206GR](https://openairdocs.org/aircraft/N206GR): [Copper River Airmotive LLC](https://openairdocs.org/faa-owner/COPPER%20RIVER%20AIRMOTIVE%20LLC), [Copper Center, AK](https://openairdocs.org/faa-place/AK/Copper%20Center), built 1972, S/N U20601753 - [N206SX](https://openairdocs.org/aircraft/N206SX): [Laughlin Audio Video Electric Inc](https://openairdocs.org/faa-owner/LAUGHLIN%20AUDIO%20VIDEO%20ELECTRIC%20INC), [Santa Ynez, CA](https://openairdocs.org/faa-place/CA/Santa%20Ynez), built 1966, S/N P206-0316 - [N296BJ](https://openairdocs.org/aircraft/N296BJ): [Qualitair LLC Trustee](https://openairdocs.org/faa-owner/QUALITAIR%20LLC%20TRUSTEE), Michelstadt, built 1965, S/N 21058697 - [N326WR](https://openairdocs.org/aircraft/N326WR): [Roquemore William A Jr](https://openairdocs.org/faa-owner/ROQUEMORE%20WILLIAM%20A%20JR), [Lakeland, GA](https://openairdocs.org/faa-place/GA/Lakeland), built 1966, S/N 308 - [N4879F](https://openairdocs.org/aircraft/N4879F): [Citizen Air LLC](https://openairdocs.org/faa-owner/CITIZEN%20AIR%20LLC), [Port Angeles, WA](https://openairdocs.org/faa-place/WA/Port%20Angeles), built 1966, S/N U206-0579 - [N5090U](https://openairdocs.org/aircraft/N5090U): [Volatile Aero Ventures LLC](https://openairdocs.org/faa-owner/VOLATILE%20AERO%20VENTURES%20LLC), [Boulder City, NV](https://openairdocs.org/faa-place/NV/Boulder%20City), S/N 206-0090 - [N8226R](https://openairdocs.org/aircraft/N8226R): [Hitchcock Jon E](https://openairdocs.org/faa-owner/HITCHCOCK%20JON%20E), [Roswell, NM](https://openairdocs.org/faa-place/NM/Roswell), built 1972, S/N 30435 - [N906RS](https://openairdocs.org/aircraft/N906RS): [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 1965, S/N 21058625 ## 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 ANC25LA082](https://openairdocs.org/ntsb/ANC25LA082), Aug 2, 2025: Cessna U206F (N206GR), Yakutat, AK, substantial damage. Probable cause: The pilot’s failure to maintain clearance during approach in gusting wind conditions to a remote airstrip, resulting in a collision with brush. - [NTSB ERA24LA331](https://openairdocs.org/ntsb/ERA24LA331), Jul 26, 2024: Aero Commander 200 (N326WR), Valdosta, GA, substantial damage. Probable cause: An insect nest in the right main fuel tank’s vent line, which resulted in an inaccurate fuel level reading, fuel starvation, and a total loss of engine power. ## FAA accident and incident reports (6) 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 20240726016079A](https://openairdocs.org/incident/20240726016079A), Jul 26, 2024: Aero Commander 200 (N326WR), Valdosta, GA, Substantial damage. On July 26, 2024, at approximately 1422 eastern standard time (EST), a 1966 Aero Commander model 200, sustained major damage while attempting an emergency… - [Incident 20181128024769I](https://openairdocs.org/incident/20181128024769I), Nov 28, 2018: Aero Commander 200D (N123CU), San Marcos, TX, No damage. While on approach to hyi the pilot attempted to add power. The engine did not respond resulting in a loss of altitude and failure to reach the intended runway.… - [Incident 19980427018169I](https://openairdocs.org/incident/19980427018169I), Apr 27, 1998: Cessna U206A (N4879F), Ekalaka, MT. 2 Bumps ata cruise loud bang. Landed in pasture tear down indicated counter weight failure. - [Incident 19900108006789I](https://openairdocs.org/incident/19900108006789I), Jan 8, 1990: Cessna P206A (N4697F), Fort Wayne, IN. Experienced power failure en route. Emergency landing on highway. Throttle cable was broken. - [Incident 19850621032389I](https://openairdocs.org/incident/19850621032389I), Jun 21, 1985: Blanca 1730A (N8226R), Truth Or Conseq, NM, Minor damage. Landed on highway after power loss. Wing struck road reflector. Exact engine problem not reported. - [Incident 19821022061889I](https://openairdocs.org/incident/19821022061889I), Oct 22, 1982: Bell 206A (N4697F), Angola, IN, Minor damage. Violent nose wheel shimmy on landing. Nose wheel fork broke off. ## Service difficulty reports (73, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR S1ZA2019091300000](https://openairdocs.org/sdr/S1ZA2019091300000), Sep 13, 2019: ENGINE. FAILED. ENGINE FAILURE OVER OLD GROWTH FOREST. THE ENGINE HAD A LOUD BANG AND STARTED RUNNING VERY ROUGH ACCORDING TO PILOT. THE ENGINE SHOOK JUST AS BADLY WHILE OFF AN - [SDR CA140516003](https://openairdocs.org/sdr/CA140516003), May 13, 2014: CYLINDER. DAMAGED. (CAN) CYLINDER NR 1 REMOVED DUE TO LOW COMPRESSION. PRIMARY LOSS OF COMPRESSION OBSERVED FROM CRANKCASE BREATHER, RINGS. CYLINDER REMOVED TO CORRECT CONDITION. - [SDR 2013FA0000499](https://openairdocs.org/sdr/2013FA0000499), Aug 15, 2013: BEARING. FAILED. PILOT REPORTED AN INOPERATIVE MAGNETO ON PREFLIGHT RUN UP. WHEN THE MAGNETO WAS REMOVED IT WAS NOTICED THAT THE ENDS OF THE PN 531178, DRIVE COUPLING RETAINER W - [SDR 2013FA0000299](https://openairdocs.org/sdr/2013FA0000299), May 21, 2013: SADDLE. CRACKED. THE LT AND RT MAIN GEAR SADDLES WERE REPLACED 3-14-1977 AT TACH 1448.0 IAW AD76-14-07R2 AND SE75-26 THEY WERE DUE FOR A DY PENETRANT CHECK 1300 HRS LATER. THE D - [SDR 2013FA0000300](https://openairdocs.org/sdr/2013FA0000300), May 21, 2013: SADDLE. CRACKED. THE LT AND RT MAIN GEAR SADDLES WERE REPLACED 3-14-1977 AT TACH 1448.0. IAW AD76-14-07R2 AND SE75-26 THEY WERE DUE FOR A DY PENETRANT CHECK 1300 HRS LATER. THE - [SDR RTEA2013F00000](https://openairdocs.org/sdr/RTEA2013F00000), Apr 1, 2013: DISTRIBUTOR GEAR. DISLODGED. ENGINE RAN ROUGH WHEN ON AFFECTED MAGNETO ONLY. DURING RUNUP FOR ROUTINE SCHEDULED INSPECTION. ON DISASSEMBLY OF MAGNETO, DISCOVERED THE DISTRIBUTOR FINGER HAD - [SDR 2011FA0000306](https://openairdocs.org/sdr/2011FA0000306), May 6, 2011: HUB. CRACKED. THE PROPELLER WAS INSPECTED FOR COMPLETE O/H AND THE HUB WAS FOUND TO HAVE A CRACKED BLADE RETENTION THREADS. THIS MODEL OF PROPELLER HAS A HISTORY OF CRACKING - [SDR 2011FA0000226](https://openairdocs.org/sdr/2011FA0000226), Apr 4, 2011: BULKHEAD. CRACKED. DURING INSP IAW AD72-07-09, DATED 10/17/1974, AND SL SE72-3, THE AFT BULKHEAD WAS FOUND CRACKED IN BOTH RUDDER CABLE CUTOUTS. UPON REMOVAL OF AFT BULKHEAD THE L - [SDR 2010FA0001240](https://openairdocs.org/sdr/2010FA0001240), Dec 8, 2010: WIRE HARNESS. FAULTY. ENGINE MISFIRING AT ALL POWER SETTINGS. DIAGNOSED FAULT TO BE THE IGNITION HARNESS LEADS. UTILIZING AN EASTERN TECHNOLOGY IGNITION HARNESS TESTER. IT WAS DETERM - [SDR RTE2010F00001](https://openairdocs.org/sdr/RTE2010F00001), Sep 1, 2010: CONTACT BREAKER. INOPERATIVE. IT IS APPARENT THAT MFG MAGNETOS HAVE HAD THE CONTACT BREAKER ASSY REPLACED IAW SB2-06A, DATED 7/1/06 ARE EXPERIENCING RAPID INTERNAL TIMING CHANGES. THE CONDIT - [SDR AG2R91788.1](https://openairdocs.org/sdr/AG2R91788.1), Aug 21, 2009: CYLINDER HEAD. CRACKED. EXHAUST SEAT CRACK TOO SEVERE FOR REPAIR. ACFT MFG, MODEL, SN, TOTAL TIME AND CYLCES ARE UNKNOWN. - [SDR 2006FA0000448](https://openairdocs.org/sdr/2006FA0000448), Apr 14, 2006: FCU. WORN. FOUND SHAFT AND LINKAGE EXCESSIVELY WORN. HAD COMPLETE ASSEMBLY OVERHAULED. (K) - [SDR XGN2005F00010](https://openairdocs.org/sdr/XGN2005F00010), Oct 11, 2005: CYLINDER. CRACKED. FOUND CRACK AT THE 100 HR INSPECTION. ON GOING PROBLEM WITH THE ECI CYLINDERS. (K) - [SDR 2005FA0001198](https://openairdocs.org/sdr/2005FA0001198), Jul 9, 2005: WEDGE. BROKEN. CABLE BROKE AT THE S3 WEDGE WHERE THE BARREL END CONNECTS TO THE INTERNAL CABLE. THIS AREA IS NOT VISIBLE AS THERE IS AN INTERNAL SLEEVE THAT COVERS THE CABLE I - [SDR 2005FA0001012](https://openairdocs.org/sdr/2005FA0001012), Jun 17, 2005: CYLINDER HEAD. CRACKED. ENGINE WITH 450.0 TIS AND CYLINDER NR 2 WITH THE SAME TIS, BUT 31.0 HOURS SINCE REMOVAL/REPAIR/REINSTALLATION. DURING CRUISE FLIGHT, ENG BECAME VERY ROUGH WITH - [SDR 2005FA0000168](https://openairdocs.org/sdr/2005FA0000168), Oct 26, 2004: STUD. FAILED. (2) EA DECK STUDS ON NR 1 CYLINDER FAILED. (K) - [SDR AOC04005](https://openairdocs.org/sdr/AOC04005), Jul 28, 2004: CYLINDER. CHIPPED. UPON RECEIVING INSPECTION OF NEW ECI CYLINDERS, ONE CYLINDER WAS FOUND TO HAVE THE NICKEL PLATING CHIPPED (.7500 INCH LONG X .0312 INCH WIDE) AT THE BASE OF THE - [SDR 2004FA0000685](https://openairdocs.org/sdr/2004FA0000685), Jun 9, 2004: CYLINDER HEAD. CRACKED. HOLE THROUGH HEAD OR EXHAUST SIDE, NR7707-14, NR 7707-5 CRACKED HEAD. EST 500 HOURS SINCE NEW. - [SDR 2004FA0000516](https://openairdocs.org/sdr/2004FA0000516), May 19, 2004: ARM. INOPERATIVE. NOSE GEAR ON THIS AC WOULD NOT EXTEND DURING NORMAL, SUBSEQUENT EMERG L/G EXTEND PROCEDURE. UPON JACKING AC, FREEING NOSE GEAR, IT WAS DISCOVERED NOSE L/G DOOR - [SDR 031311](https://openairdocs.org/sdr/031311), Nov 7, 2003: PUMP. WRONG PART. DURING PRE-PURCHASE EVALUATION FOUND DRY VACUUM PUMP INSTALLED AT ENGINE OVERHAUL APPROX 90 HOURS AGO. ORIGINAL PUMP WAS WET TYPE. ALL PLUMBING FOR WET PUMP WAS - [SDR AUS20030419](https://openairdocs.org/sdr/AUS20030419), Apr 11, 2003: CONTROL CABLE. SEPARATED. (AUS) THROTTLE CABLE OUTER GUIDE SEPARATED FROM SWAGED SWIVEL JOINT ALLOWING CABLE TO FAIL IN COMPRESSION. - [SDR AUS20030345](https://openairdocs.org/sdr/AUS20030345), Mar 7, 2003: BEARING. WORN. (AUS) CONNECTING ROD BIG END BEARING WORN EXCESSIVELY. - [SDR 2002FA0001399](https://openairdocs.org/sdr/2002FA0001399), Dec 4, 2002: NUT. LOOSE. LARGE LOCKNUT ON OIL FILTER ADAPTER CAME LOOSE AND OIL WENT OVERBOARD AND THE ENGINE SEIZED. THE AIRCRAFT LANDED IN A FIELD. THE SAFETY WIRE WAS STILL ATTACHED. - [SDR AUS20021008](https://openairdocs.org/sdr/AUS20021008), Aug 30, 2002: FITTING. CRACKED. (AUS) FORWARD FIN ATTACHMENT FITTING CRACKED IN AREA ADJACENT TO THE LH BOLT HOLE. FOUND DURING INSPECTION IAW AD/C206/7A4. - [SDR 2001FA0000578](https://openairdocs.org/sdr/2001FA0000578), Nov 15, 2001: SKIN. DAMAGED. DURING AN ANNUAL INSPECTION THE RIGHT INBOARD SKIN HAD EXCESSIVE OIL CANNING WHEN FLEXED. WHEN FAIRING, PN 12124265 AND 12124266 (RIGHT AND LEFT) WERE REMOVED, - [SDR 2001FA0000579](https://openairdocs.org/sdr/2001FA0000579), Nov 15, 2001: SKIN. DAMAGED. DURING AN ANNUAL INSPECTION THE RIGHT INBOARD SKIN HAD EXCESSIVE OIL CANNING WHEN FLEXED. WHEN FAIRING, PN 12124265 AND PN 12124266 (RIGHT AND LEFT) WERE REMOVE - [SDR AUS20010516](https://openairdocs.org/sdr/AUS20010516), Apr 12, 2001: SPRING. FAILED. (AUS) STARTER CLUTCH SPRING FAILED CAUSING DAMAGE TO THE CRANKSHAFT,CAMSHAFT GEAR AND ATTACHING HARDWARE. ROCKWELL HARDNESS TESTREVEALED INCONSISTANT HARDNESS. - [SDR CA001218021](https://openairdocs.org/sdr/CA001218021), Nov 29, 2000: THROTTLE CABLE. FAILED. (CAN) A/C WAS BEING PREPARED FOR THE DAYS FLYING WHEN THE PILOT NOTICED THE THROTTLE WAS STIFF. HEAT WAS APPLIED TO THE CABIN AS IT WAS -22 DEGREES OAT. THE CAB - [SDR AU000847](https://openairdocs.org/sdr/AU000847), Sep 13, 2000: ANGLE. CORRODED. (AUS) LEFT AND RIGHT WING FORWARD ATTACHMENT FITTING ANGLES CONTAINED INTERGRANNULAR CORROSION. (X) - [SDR AU000813](https://openairdocs.org/sdr/AU000813), Sep 12, 2000: BULKHEAD. CRACKED. (AUS) FORWARD DOORPOST BULKHEAD CRACKED ON LEFT AND RIGHT SIDES. (X) - [SDR AU000814](https://openairdocs.org/sdr/AU000814), Sep 12, 2000: ANGLE. CORRODED. (AUS) RIGHT WING LOWER SPAR CAP ANGLE CONTAINED INTERGRANNULAR CORROSION. (X) - [SDR AU000815](https://openairdocs.org/sdr/AU000815), Sep 12, 2000: ANGLE. CORRODED. (AUS) LEFT WING UPPER SPAR CAP ANGLE CONTAINED EXFOLIATION CORROSION. (X) - [SDR AU000674](https://openairdocs.org/sdr/AU000674), Sep 1, 2000: IMPULSE COUPLING. FAULTY. (AUS) MAGNETO IMPULSE COUPLINGS (2OFF) HAD LOOSE RIVETS IN THE FLYWEIGHT ASSEMBLIES. FOUND DURING INSPECTION IAW SLICK SB 1-86B. (X) - [SDR 20000908SH008](https://openairdocs.org/sdr/20000908SH008), Aug 15, 2000: POINTS. FAILED. DURING PRE-INSPECTION RUN-UP BY MECHANIC, FOUND UNUSUAL MAG DROP ON RIGHT MAGNETO REMOVED FOR TROUBLESHOOTING. FOUND THE POINT ASSY CONTACT LOOSE AND FALLING OU - [SDR 20000829SH012](https://openairdocs.org/sdr/20000829SH012), Aug 10, 2000: THROTTLE. BROKEN. PILOT STARTED TO REDUCE POWER IN ORDER TO LOSE ALTITUDE. AT THIS TIME, THE THROTTLE CABLE BROKE CAUSING A LOSS IN ENGINE POWER. PILOT MADE SAFE LANDING IN A REM - [SDR CA000621021](https://openairdocs.org/sdr/CA000621021), Jun 10, 2000: LINE. CHAFED. (CAN) DURING TAXI, THE PILOT NOTICED THE RT BRAKE HAD LESS PRESSURE THAN THE LT. AIRCRAFT RETURNED TO BLOCKS,. INVESTIGATION REVEALED THAT THE RT BRAKE LINE HAD - [SDR 99ZZZX4251](https://openairdocs.org/sdr/99ZZZX4251), Oct 27, 1999: CYLINDER. CRACKED. DURING INSPECTION, FOUND GREASE LIKE FLUID ON INDUCTION TUBES AND WHERE CYLINDER AND HEAD ATTACH. REMOVED AND SENT TO OVERHAUL SHOP. REPORTED CRACKED HEAD WILL - [SDR 20000621SH010](https://openairdocs.org/sdr/20000621SH010), Oct 7, 1999: COOLER. LEAKING. PART BEGAN LEAKING DURING NORMAL SERVICE DUE TO EPOXY FAILURE. EPOXY WAS USED OVER A CRACK IN THE OIL COOLER WHICH WORKED ITS WAY TO THE SURFACE OF THE HARDENED - [SDR AU990731](https://openairdocs.org/sdr/AU990731), Jul 12, 1999: FRAME. CRACKED. (AUS) LEFT DOORPOST FRAME CRACKED. FUSELAGE SKIN RIVETS LOOSE IN AREA ADJACENT TO THE WING STRUT. - [SDR AU990732](https://openairdocs.org/sdr/AU990732), Jul 12, 1999: BULKHEAD. CRACKED. (AUS) FUSELAGE AFT BULKHEAD LOCATED AT STN 209.0 CRACKED IN THE UPPER RT CORNER ADJACENT TO THE RT HORIZONTAL STABILIZER ATTACHMENT FITTING. - [SDR 99ZZZX4475](https://openairdocs.org/sdr/99ZZZX4475), Jul 8, 1999: CYLINDER. FAILED. CYLINDER HEAD SEPARATED DURING FLIGHT. ACFT MADE PRECAUTIONARY LANDING. POST-INCIDENT INSP REVEALED NR 3 CYL HEAD SEPARATED BETWEEN ITS COOLING FINS. HEAD CRACK - [SDR AU990437](https://openairdocs.org/sdr/AU990437), May 8, 1999: WIRE. BROKEN. (AUS) ALTERNATOR GROUND LEAD HAD COME ADRIFT FROM ITS TERMINAL AT THE ALTERNATOR SOME TIME PREVIOUSLY AND HAD BEEN STOWED IN THE LOOM AND HAD NOT BEEN RETERMINA - [SDR CA990521008](https://openairdocs.org/sdr/CA990521008), May 3, 1999: PISTON PIN. CORRODED. (CAN) AIRCRAFT ENGINE WAS BROUGHT IN TO CARRY OUT CSB-99-3. WHEN PREPARING TO REINSTALL THE PISTON PINS, THE PINS WERE FOUND WITH SUBSTANTIAL CORROSION FOR THE - [SDR AU990086](https://openairdocs.org/sdr/AU990086), Jan 28, 1999: STATIC SYSTEM. CONTAMINATED. (AUS) STATIC SYSTEM CONTAMINATED WITH WATER. AIRCRAFT HAD BEEN PARKED IN THE OPEN DURING A RAIN STORM. - [SDR CA990129006](https://openairdocs.org/sdr/CA990129006), Nov 28, 1998: HUB. CORRODED. (CAN) HEAVY EXTERNAL CORROSION ON THE PROPELLER HUB. - [SDR 98ZZZX4363](https://openairdocs.org/sdr/98ZZZX4363), Sep 29, 1998: THRU-BOLT. BROKEN. THRU-BOLT IN CRANKCASE FOUND BROKEN. - [SDR AU981431](https://openairdocs.org/sdr/AU981431), Aug 20, 1998: HUB. CORRODED. (AUS) PROPELLER HUB SEVERELY CORRODED. - [SDR CA980623021](https://openairdocs.org/sdr/CA980623021), Jun 15, 1998: CYLINDER. SEPARATED. (CAN) NR 5 CYLINDER WAS FOUND TO HAVE A CYLINDER SEPARATION. - [SDR CA980519002](https://openairdocs.org/sdr/CA980519002), May 4, 1998: COVER. CRACKED. (CAN) ENGINE OIL LEAK. INSPECTION FOUND NR 5 CYLINDER PUSH ROD COVER CRACKED AT BEAD. PUSH ROD COVER REPLACED. - [SDR CA970909007](https://openairdocs.org/sdr/CA970909007), Aug 18, 1997: COLLAR. BROKEN. (CAN) THE AIRCRAFT IS USED FOR TRANSPORTING SKY DIVERS AND IS SUBJECT TO LONG TAKEOFF RUNS AND CROSSWINDS. THIS CONDITION SUBJECTS THE LANDING GEAR STRUT TO HIG All 73: https://openairdocs.org/engine/continental-io-520-a/reports.md ## STCs that may be installed (OpenAirDocs) (57, 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 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 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 SE5205NM](https://openairdocs.org/stc/SE5205NM): Installation of an Oilamatic engine filter screen adapter. Oilamatic Inc - [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 SE4020NM](https://openairdocs.org/stc/SE4020NM): Installation of Ritter and Iverson Cam P/N 32122-1. Ritter & Iverson Co, 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 All 57: https://openairdocs.org/engine/continental-io-520-a/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.