# Continental GTSIO-520-N - Type: Engine model (FAA registry) - Registry code: 17102 - Manufacturer (registry): CONT MOTOR - Model: GTSIO-520-N - Engine type: Reciprocating - Power: 375 hp - Data sheet: [TCDS E7CE](https://openairdocs.org/tcds/E7CE) (OpenAirDocs) - Holder: Continental Aerospace Technologies, Inc. - Installed in: 10 registered aircraft - Page: https://openairdocs.org/engine/continental-gtsio-520-n 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 2023-05-16](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 2020-16-11](https://openairdocs.org/ad/2020-16-11): SUMMARY: Reciprocating Cylinder Section · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 23 more. Effective Sep 21, 2020 - [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 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 2010-07-08](https://openairdocs.org/ad/2010-07-08): Turbochargers · Kelly Aerospace Energy Systems HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 137 more. Effective Apr 19, 2010 - [AD 2008-08-17](https://openairdocs.org/ad/2008-08-17): Turbocharger turbine housing flange and the exhaust tube flange · Teledyne Continental Motors TSIOL-550-A 'Liquid-Cooled' engines (RAM Aircraft Limited Partnership STC SA7633SW or SA7633SW-D). Effective May 6, 2008 - [AD 2007-05-15](https://openairdocs.org/ad/2007-05-15): Starter adapter assembly · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 6 more. Effective Apr 16, 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 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 98-17-11](https://openairdocs.org/ad/98-17-11): Crankshafts · Continental Motors A-65-3, A-65-8, A75-8 and 90 more. Effective Oct 19, 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 93-10-02](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 87-04-05](https://openairdocs.org/ad/87-04-05): Fuel Pump · Continental Motors GTSIO-520-N. Effective Dec 1, 1988 - [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 80-25-06 R1](https://openairdocs.org/ad/80-25-06-R1): Engine Oil Pressure · Continental Motors GTSIO-520-L, GTSIO-520-M and GTSIO-520-N. Effective Mar 23, 1981 - [AD 80-09-11](https://openairdocs.org/ad/80-09-11): Starter Torsional Damper/Starter Gear Shaft · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 6 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 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 2005-20-04](https://openairdocs.org/ad/2005-20-04) (historical): Starter adapter assembly · Teledyne Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 6 more. Effective Nov 1, 2005 - [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 ## Information bulletins (advisory) (6) - [SAIB NE-18-16](https://openairdocs.org/saib/NE-18-16): POWERPLANT Alternator Drive Coupling. Issued Jun 20, 2018 - [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 ## Registered aircraft (10) - [N41LJ](https://openairdocs.org/aircraft/N41LJ): [Pic Aviation Group LLC](https://openairdocs.org/faa-owner/PIC%20AVIATION%20GROUP%20LLC), [Cornelia, GA](https://openairdocs.org/faa-place/GA/Cornelia), built 1982, S/N 421C1252 - [N421AA](https://openairdocs.org/aircraft/N421AA): [Hammett Holdings LLC](https://openairdocs.org/faa-owner/HAMMETT%20HOLDINGS%20LLC), [Townsend, GA](https://openairdocs.org/faa-place/GA/Townsend), built 1982, S/N 421C1233 - [N421FZ](https://openairdocs.org/aircraft/N421FZ): [Bamert Brett L](https://openairdocs.org/faa-owner/BAMERT%20BRETT%20L), [Muleshoe, TX](https://openairdocs.org/faa-place/TX/Muleshoe), built 1981, S/N 421C1020 - [N421JC](https://openairdocs.org/aircraft/N421JC): [Lonestar Aviation LLC](https://openairdocs.org/faa-owner/LONESTAR%20AVIATION%20LLC), [Las Cruces, NM](https://openairdocs.org/faa-place/NM/Las%20Cruces), built 1981, S/N 421C1099 - [N421JE](https://openairdocs.org/aircraft/N421JE): [Brown Lawson M II DBA](https://openairdocs.org/faa-owner/BROWN%20LAWSON%20M%20II%20DBA), [San Diego, CA](https://openairdocs.org/faa-place/CA/San%20Diego), built 1981, S/N 421C1057 - [N421TE](https://openairdocs.org/aircraft/N421TE): [Torgerson'S LLC](https://openairdocs.org/faa-owner/TORGERSON'S%20LLC), [Ethridge, MT](https://openairdocs.org/faa-place/MT/Ethridge), built 1981, S/N 421C1201 - [N469CJ](https://openairdocs.org/aircraft/N469CJ): [Herndon Aviation LLC](https://openairdocs.org/faa-owner/HERNDON%20AVIATION%20LLC), [Kokomo, IN](https://openairdocs.org/faa-place/IN/Kokomo), built 1980, S/N 421C1018 - [N51QZ](https://openairdocs.org/aircraft/N51QZ): [Aircraft Guaranty Corp Trustee](https://openairdocs.org/faa-owner/AIRCRAFT%20GUARANTY%20CORP%20TRUSTEE), [Oklahoma City, OK](https://openairdocs.org/faa-place/OK/Oklahoma%20City), built 1982, S/N 421C1237 - [N605SR](https://openairdocs.org/aircraft/N605SR): [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 1981, S/N 421C1041 - [N92CV](https://openairdocs.org/aircraft/N92CV): [Randall Grier Ministries](https://openairdocs.org/faa-owner/RANDALL%20GRIER%20MINISTRIES), [Owasso, OK](https://openairdocs.org/faa-place/OK/Owasso), built 1984, S/N 421C1065 ## NTSB investigations None matched to aircraft with this engine model. ## 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. - [Incident 20170702016529I](https://openairdocs.org/incident/20170702016529I), Jul 2, 2017: Cessna 421C (N41LJ), Hollywood, FL, Minor damage. At approximately 17:19 zulu, a Cessna 421C, registration N41LJ, with pilot in command (PIC) and five passengers on board; reported a bird strike with minor… - [Incident 19990319018589I](https://openairdocs.org/incident/19990319018589I), Mar 19, 1999: Cessna 421C (N92CV), Steamboat Spgs, CO, Minor damage. (-5) No narrative ## Service difficulty reports (54, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR 2026FA0000551](https://openairdocs.org/sdr/2026FA0000551), Jun 30, 2026: GASKET. DEGRADED. FAILED GASKET PN: 5154056-2 FOR THE AC COMPRESSOR, RESULTING IN A SEVERE ENGINE OIL LEAK, SPRAYING ENGINE OIL ON THE EXHAUST SYSTEM. - [SDR 2018FA0000508](https://openairdocs.org/sdr/2018FA0000508), Dec 11, 2018: PRESSURE SWITCH. FAILED. IN SPITE OF NO REQUIREMENT TO TEST THIS PRESSURE SWITCH. FOUND THIS PRESSURE SWITCH FAILED IN THE CLOSED POSITION. - [SDR CXUA201803210140](https://openairdocs.org/sdr/CXUA201803210140), Dec 7, 2017: ENGINE. FAILED. RIGHT ENGINE FAILED. - [SDR NI6R201503050024](https://openairdocs.org/sdr/NI6R201503050024), Mar 5, 2015: CRANKCASE. CRACKED. DURING INVESTIGATION OF LT ENGINE OIL LEAK, A CRACK WAS DISCOVERED IN THE ENGINE CASE OTBD SIDE RUNNING BETWEEN THE NR 2 & NR 4 CYLINDERS. - [SDR NI6R201502260023](https://openairdocs.org/sdr/NI6R201502260023), Feb 26, 2015: PIN. BROKEN. RT ENGINE NR 5 WRIST PIN, INTERNAL ALUMINUM PIECE BROKEN. - [SDR IGXR2014FA0000710](https://openairdocs.org/sdr/IGXR2014FA0000710), Dec 15, 2014: LINE. FAILED. AFTER TAKEOFF, LT ENGINE STOPPED PRODUCING FULL POWER. AIRCRAFT SAFELY RETURNED BACK WITH 1 ENGINE. EXAMINED LT ENGINE AND DISCOVERED CYL NR 6 FUEL LINE DETACHE - [SDR 2013FA0000674](https://openairdocs.org/sdr/2013FA0000674), Nov 8, 2013: BOOT. FAILED. EYELET ATTACHMENT NOT FULLY INSULATED ALLOWING DIRECT SHORT TO GROUND ON ONE DE-ICE BOOT. THE SECOND WAS A FAILED INBD CIRCUIT. - [SDR YN8R201307310001](https://openairdocs.org/sdr/YN8R201307310001), Jul 31, 2013: PUMP. LEAKING. AFTER FUELING, PILOT NOTICED FUEL DRIPPING FROM GANG DRAIN BENEATH ENGINE. DISCOVERED FUEL WAS DRIPPING FROM ENGINE DRIVEN FUEL PUMP AT A RATE OF A DROP EVERY T - [SDR 2012FA0000810](https://openairdocs.org/sdr/2012FA0000810), Nov 21, 2012: CYLINDER. DETACHED. NR 5 CYLINDER UPPER BASE STUDS FAILED - THREE BLIND STUDS & 1 CASE THROUGH-STUD. CYLINDER PARTIALLY DISLODGED FROM CRANKCASE, LOSS OF ENGINE OIL, SIGNIFICANT VI - [SDR 2008FA0000625](https://openairdocs.org/sdr/2008FA0000625), Sep 5, 2008: BUSHING. CRACKED. DURING CYLINDER NR 5 REMOVAL TO CORRECT HIGH OIL CONSUMPTION , FOUND CONNECTING ROD PISTON PIN BUSHING CRACKED WITH LARGE PIECE MISSING FROM EDGE. FAILURE IS AS - [SDR 2007FA0000944](https://openairdocs.org/sdr/2007FA0000944), Oct 12, 2007: STARTER. SHORTED. OVERHAULED STARTER FAILED AFTER 30 HOURS. (K) - [SDR 2006FA0001178](https://openairdocs.org/sdr/2006FA0001178), Dec 12, 2006: CLAMP. CRACKED. DURING PROGRESSIVE INSPECTION FOUND LT ENGINE TURBOCHARGER TO TAILPIPE CLAMP CRACKED ALONG CIRCUMFERENCE, APPROX. 4 INCH CRACK. FOUND SAME PN CLAMP ON THE RT EN - [SDR 2006FA0001111](https://openairdocs.org/sdr/2006FA0001111), Nov 21, 2006: CLAMP. CRACKED. PN 2274-50 (ALSO PN NH1000897-50) CLAMP HOLDING TAILPIPE TO THE TURBO CRACKED LENGTHWISE ALONG THE CIRCUMFERENCE OF THE CLAMP. TOTAL LENGTH OF THE CRACK IS 3 IN - [SDR 2006FA0000985](https://openairdocs.org/sdr/2006FA0000985), Sep 22, 2006: LINE. RUPTURED. FUEL HOSE RUPTURED, SPRAYING FUEL ON THE HOT EXHAUST MANIFOLD TO TURBO CHARGER CAUSING AN ENGINE FIRE ON THE GROUND. (K) - [SDR ISW1520050019](https://openairdocs.org/sdr/ISW1520050019), Feb 23, 2006: ADAPTER. FAILED. THE ENGINE QUIT RUNNING AND SEIZED DURING FLIGHT. THE STARTER ADAPTER FAILED AND CAUSED THE ENGINE TO SEIZE. MAINTENANCE RECORDS SHOW THAT THE STARTER WAS REPLA - [SDR 2005FA0001618](https://openairdocs.org/sdr/2005FA0001618), Dec 15, 2005: DISTRIBUTOR GEAR. DISINTEGRATED. DURING CRUISE LT ENGINE BEGAN TO RUN ROUGH. MAINTENANCE TRACED PROBLEM TO LT MAG. UPON OPENING THE MAGNETO, DISCOVERED THE DISTRIBUTOR GEAR MISSING 98 PERCENT O - [SDR AU510001911](https://openairdocs.org/sdr/AU510001911), Dec 12, 2005: GEAR. DAMAGED. (AUS) ENGINE CRANKSHAFT GEAR MISSING TEETH. SUSPECT CAUSED BY A PIECE OF METAL FROM THE STARTER ADAPTER GEAR JAMMING IN THE GEAR TEETH. METAL CONTAMINATION OF E - [SDR VA12004F00000](https://openairdocs.org/sdr/VA12004F00000), Aug 2, 2004: CRANKSHAFT. BROKEN. CRANKSHAFT HAD BEEN ULTRASONIC INSPECTED IAW APPLICABLE CSB 99-6A DURING OVERHAUL. RETURNED TO SERVICE AND AFTER 141.1 HOURS, FAILED IN SAME GENERAL OF REQUIRE - [SDR 2004FA0000632](https://openairdocs.org/sdr/2004FA0000632), Jun 15, 2004: LINE. CRACKED. PILOT EXPERIENCED EGT FLUXUATIONS, MADE PRECAUTIONARY LANDING. INSPECTION REVEALED CYLINDER NR 4 INJECTOR LINE WAS CRACKED AND LEAKING FUEL AT THE BASE OF THE B - [SDR J7B2003F00001](https://openairdocs.org/sdr/J7B2003F00001), Oct 10, 2003: COIL. SEPARATED. ON TAKE OFF THE RT ENGINE FEATHERED. INSPECTION REVEALED PROPELLER SYNCROPHASER COIL HAD BECOME SEPARATED FROM THE GOVERNOR BODY, CAUSING THE PROPELLER TO FEATH - [SDR AUS20030839](https://openairdocs.org/sdr/AUS20030839), Jul 16, 2003: HOUSING. FAULTY. (AUS) RT ENGINE OIL PUMP HOUSING FAULTY. - [SDR 2002F00038](https://openairdocs.org/sdr/2002F00038), Jan 17, 2002: PISTON. FAILED. TRANSISITIONING FROM TAKE-OFF TO CLIMB PHASE OF FLIGHT, AFTER REDUCING POWER NR 1 ENGINE SHUTDOWN. PILOT FEATHERED PROP AND MADE UNEVENTFUL LANDING. REMOVAL OF - [SDR 2002F00037](https://openairdocs.org/sdr/2002F00037), Dec 21, 2001: TORQUE TUBE. CORRODED. DURING A AAIP 100 HOUR INSPECTION, SEVERE CORROSION WAS NOTED IN THE RIGHT ELEVATOR TORQUE TUBE. THE CORROSION (RUST) HAS DEPLETED AT LEAST 75% OF THE MATERIAL - [SDR 2001F00021](https://openairdocs.org/sdr/2001F00021), Jun 20, 2001: NUT. CRACKED. DURING ANNUAL INSPECTION FOUND NUT CRACKED. NOTHING UNUSUAL NOTICED AS FAR AS INSTALLATION WAS CONCERNED. FOUND THAT NUT CRACKED IN THE CENTER OF THE V ON THE S - [SDR AUS20010645](https://openairdocs.org/sdr/AUS20010645), Jun 12, 2001: BEARING. FAILED. (AUS) LH ALTERNATOR. INVESTIGATION FOUND REAR BEARING COLLAPSED CAUSING DRIVE ADAPTER FAILURE AND METAL CONTAMINATION OF THE ENGINE. - [SDR 20010515AP005](https://openairdocs.org/sdr/20010515AP005), May 4, 2001: EXHAUST HEADER. DEFECTIVE. THIS UNIT IS MANUFACTURED IN TWO HALVES, WHERE THE UPPER & LOWER HALVES WELDED TOGETHER (AT THE WASTE GATE FLANGE) THERE IS A HOLE AT THE WELD AREA ON EACH SIDE - [SDR AU001155](https://openairdocs.org/sdr/AU001155), Dec 11, 2000: PIPE. CORRODED. (AUS) OXYGEN PIPE CORRODED AND LEAKING IN AREA BEHIND PILOTS SEAT SIDELINING. PIPE CONTAINED PIN HOLE CORROSION IN THE AREAS TOUCHING THE SCAT HOSE. - [SDR 20001206SH032](https://openairdocs.org/sdr/20001206SH032), Nov 20, 2000: LINE. LOOSE. THE LEFT ENGINE TURBOCHARGER COMPRESSOR DISCHARGE REFERENCE LINE CAME OFF AT CRUISE POWER AT 15,500 FEET CAUSING THE ENGINE TO DIE WITH AN EXCESSIVELY RICH MIXT - [SDR 20000331SH025](https://openairdocs.org/sdr/20000331SH025), Mar 6, 2000: STUD. FAILED. DURING INSPECTION OF OIL LEAK, FOUND NR 5 CYLINDER BASE FRONT LOWER MOUNT STUD BROKEN. POSSIBLY, THE STUD WAS HARD AND BROKE UNDER STRESS. (X) - [SDR 20000403SH002](https://openairdocs.org/sdr/20000403SH002), Mar 6, 2000: STUD. FAILED. DURING NORMAL ENGINE OPERATION, NOTICED OIL LEAK ON FRONT OF ENGINE. AFTER CLEANING AND INSPECTION, FOUND THE FRONT THROUGH-STUD BROKEN. POSSIBLE CAUSE COULD BE - [SDR 99ZZZX4549](https://openairdocs.org/sdr/99ZZZX4549), Sep 21, 1999: SUPPORT PIN. FAILED. FOREIGN OBJECT DAMAGE WITHIN LEFT ENGINE ASSEMBLY CAUSED IDLER GEAR SUPPORT PIN BETWEEN MAGNETO DRIVES TO SHEAR CAUSING MOUNT STUDS TO BREAK AND THE GEAR IT RID - [SDR 99ZZZX2275](https://openairdocs.org/sdr/99ZZZX2275), May 1, 1999: CRACK. CRACKED. PILOT REPORTED EXCESSIVE OIL LEAK ON RIGHT ENGINE CAWLING PULLED AND 3 INCH - 4 INCH CRACK NOTED AT NR 5 CYLINDR BASE. IDENTIDAL PROBLEM OCCURRED. - [SDR 99ZZZX1733](https://openairdocs.org/sdr/99ZZZX1733), Apr 12, 1999: FUEL LINE. BROKEN. PILOT LANDED AND STATED THAT DURING FLIGHT, THE LEFT ENGINE STARTED TO VIBRATE AND EGT INDICATION ON NR 4 CYLINDER WENT TO ZERO. PILOT ELECTED TO SHUT DOWN THE - [SDR 99ZZZX1200](https://openairdocs.org/sdr/99ZZZX1200), Mar 1, 1999: BOLT. BROKEN. WHILE TROUBLESHOOTING AN OIL LEAK, THE LOWER THRU-BOLT BETWEEN THE NR 4 AND NR 5 CYLINDER WAS FOUND BROKEN APPROXIMATELY .50 INCH FROM THE END. AFTER CYLINDER R - [SDR 99ZZZX1457](https://openairdocs.org/sdr/99ZZZX1457), Feb 24, 1999: ADAPTER. SPALLED. AIRCRAFT IN FOR ROUTINE (SCHEDULED) 100 HOUR INSPECTION. STARTER ADAPTERS WERE REMOVED FROM BOTH ENGINES, AND INSPECTED IAW TCM SB NR CS894-4A. THE ADAPTER ASSY - [SDR 99ZZZX1458](https://openairdocs.org/sdr/99ZZZX1458), Feb 24, 1999: GEAR. SPALLED. AIRCRAFT IN FOR ROUTINE (SCHEDULED) 100 HOUR INSPECTION. STARTER ADAPTERS WERE REMOVED FROM BOTH ENGINES, AND INSPECTED IAW TCM SB NR CS894-4A. THE ADAPTER ASSY - [SDR 99ZZZX583](https://openairdocs.org/sdr/99ZZZX583), Jan 15, 1999: ROD. FAILED. ENGINE STARTED EXTREME VIBRATION CLIMBING THROUGH 13,000 FEET. OIL LEAK OBSERVED COMING FROM LOUVERS. ENGINE WAS SHUT DOWN AND PROPELLER FEATHERED. INSPECTION R - [SDR 99ZZZX365](https://openairdocs.org/sdr/99ZZZX365), Jan 4, 1999: CRANKCASE. CRACKED. DURING A PHASE 3 INSPECTION, A 1.50 INCH CRACK WAS NOTED ABOVE THE LEFT ENGINE, NR 2 CYLINDER. PER M90-17, THIS WAS IN A NON-CRITICAL AREA, SO THE CRACK WAS SCR - [SDR 98ZZZX3441](https://openairdocs.org/sdr/98ZZZX3441), Aug 10, 1998: BEARING. WORN. DURING ROUTINE INSPECTION OF THE AIRCRAFT MAGNETO TO ENGINE TIME CHECK REVEALED 15 DEGREE DISCREPANCY. FURTHER INSPECTION FOUND MAGNETO CAMSHAFT LOOSE IN THE HO - [SDR 98ZZZX3442](https://openairdocs.org/sdr/98ZZZX3442), Aug 10, 1998: BEARING. WORN. DURING ROUTINE INSPECTION OF THE AIRCRAFT, MAGNETO TO ENGINE TIME CHECK REVEALED 15 DEGREE DISCREPANCY. FURTHER INSPECTION FOUND MAGNETO CAMSHAFT LOOSE IN THE H - [SDR 98ZZZX2032](https://openairdocs.org/sdr/98ZZZX2032), Apr 20, 1998: DRIVEN GEAR. WORN. PILOT REPORTED TACH INOPERATIVE AND LOSS OF OIL PRESSURE. INSPECTION REVEALED THE OIL PUMP DRIVE GEAR ASSY SHAFT HAD SHEARED AT POINT OF ENGAGEMENT TO THE CAMSH - [SDR 98ZZZX1986](https://openairdocs.org/sdr/98ZZZX1986), Mar 4, 1998: VALVE SPRING. FAILED. PILOT REPORTED VIBRATION ON RT SIDE OF AIRCRAFT DURING TAKEOFF ROLL AND CLIMB OUT. COULD NOT CORRECT WITH ENGINE CONTROLS (RPM, M.A.P., FUEL OR MAGS). RETURNED - [SDR 98ZZZX2033](https://openairdocs.org/sdr/98ZZZX2033), Feb 20, 1998: DRIVEN GEAR. SEIZED. PILOT REPORTED YAW IN AIRCRAFT AND APPARENT LOSS OF POWER ON LT ENGINE (LOW RPM AND MAP). PILOT EXERCISED EMERGENCY PROCEDURES TO RESTORE POWER, BUT WAS UNSUCCE - [SDR AU980159](https://openairdocs.org/sdr/AU980159), Feb 13, 1998: VALVE. WORN. (AUS) INLET FUEL VALVE ASSEMBLY WORN. VALVE FAILED TEST IAW AD/CESSNA400/100A4 DUE TO WORN VALVE STEM. - [SDR 97ZZZX5162](https://openairdocs.org/sdr/97ZZZX5162), Nov 21, 1997: VALVE SEAT. FAILED. NEW TCM CYLINDER ASSYS INSTALLED AT ENGINE OVERHAUL. DATE STAMPED ON ROCKER BOSS: 7-97. AFTER BREAK-IN FLIGHT AND TEST FLIGHTS, NR 2 CYL ON LT ENGINE WAS NOTED - [SDR 97ZZZX1919](https://openairdocs.org/sdr/97ZZZX1919), Apr 22, 1997: GEAR. FAILED. NEW CRANKSHAFT GEAR P/N 653580 INSTALLED AT TIME OF ENGINE OVERHAUL IN CONJUNCTION WITH TCM SB CSB 94-4 IN KIT EQ6642. ENGINE FAILED APROXIMATELY 400.0 HOURS LA - [SDR 96ZZZX6160](https://openairdocs.org/sdr/96ZZZX6160), Nov 16, 1996: DRIVE ADAPTER. WORN. STARTER DRIVE GEAR WEAR UNACCEPTABLE IAW TELEDYNE CONTINENTAL CSB 94-4 EVEN THOUGH THE SERVICE KIT REQUIRED BY TCM CSB 94-4 HAD BEEN PREVIOUSLY INSTALLED AT THE - [SDR AU960486](https://openairdocs.org/sdr/AU960486), Apr 16, 1996: PIPE. CORRODED. (AUS) LH NACELLE FUEL TANK TRANSFER PUMP TO 'T' FITTING PIPE LEAKING FUEL FROM PIN HOLE DUE TO INTERNAL CORROSION - [SDR 96ZZZX2407](https://openairdocs.org/sdr/96ZZZX2407), Apr 2, 1996: PISTON. BURNED. AIRCRAFT LOST POWER ON NR 1 ENGINE. REMOVAL OF NR 5 CYLINDER REVEALED PISTON DOME EDGE BURNED AWAY FROM 6:00 POSITION TO 12:00 POSITION. AT 9:00 POSITION, PISTO - [SDR 96ZZZX950](https://openairdocs.org/sdr/96ZZZX950), Dec 27, 1995: ADAPTER KIT. EXCESS WEAR. ON 12-27-95, A 50-HOUR INSPECTION WAS PERFORMED. METAL CONTAMINATION NOTED IN RT ENG OIL FILTER. FURTHER INVESTIGATION REVEALED TORSIONAL DAMPER AND STARTER SHA All 54: https://openairdocs.org/engine/continental-gtsio-520-n/reports.md ## STCs that may be installed (OpenAirDocs) (25) 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 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 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 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 GTSIO-520 Series - [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc. Lists GTSIO-520 Series - [STC SE3330NM](https://openairdocs.org/stc/SE3330NM): Continental valve cover gasket. Real Gaskets Tennessee - [STC SE00754DE](https://openairdocs.org/stc/SE00754DE): Installation of an auxiliary oil sump port on the oil sump pan. Oilamatic, Inc - [STC SE5726SW-D](https://openairdocs.org/stc/SE5726SW-D): Installation of Floscan - 20lb or - 203b fuel flow transducers. RAM Aircraft Limited Partnership - [STC SE3767SW-D](https://openairdocs.org/stc/SE3767SW-D): Installation of induction hose clamps. RAM Aircraft Limited Partnership - [STC SE612GL](https://openairdocs.org/stc/SE612GL): Installation of a Shadin Company 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 SE5726SW](https://openairdocs.org/stc/SE5726SW): Installation of Floscan -201b or -203b fuel flow transducers. RAM Aircraft Limited Partnership - [STC SE5743NM](https://openairdocs.org/stc/SE5743NM): Intallation of adapter for externally mounted oil filter. Aviation Development Corporation - [STC SE09963SC](https://openairdocs.org/stc/SE09963SC): Installation of modified fuel injector nozzles. General Aviation Modifications, Inc - [STC SE3767SW](https://openairdocs.org/stc/SE3767SW): Installation of induction hose clamps. RAM Aircraft Limited Partnership - [STC SE4591SW](https://openairdocs.org/stc/SE4591SW): Installation of RAM magneto pressurization system. RAM Aircraft Limited Partnership - [STC SE8338SW](https://openairdocs.org/stc/SE8338SW): Install locknuts on cylinder attachment studs and thru-bolts, and install 6 additional cylinder attachment studs onto engine crankcases. RAM Aircraft Limited Partnership. Lists GTSIO-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 GTSIO-520 Series - [STC SE00577NY](https://openairdocs.org/stc/SE00577NY): Installation of Canadian Aero Mfg. (C.A.M.) Oil Coolers. Canadian Aero Manufacturing - [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector. Aviation Development Corporation - [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp. Lists GTSIO-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 GTSIO-520 Series --- 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.