# Continental TSIO-520-AE - Type: Engine model (FAA registry) - Registry code: 17274 - Manufacturer (registry): CONT MOTOR - Model: TSIO-520-AE - Engine type: Reciprocating - Power: 250 hp - Data sheet: [TCDS E8CE](https://openairdocs.org/tcds/E8CE) (OpenAirDocs) - Holder: Continental Aerospace Technologies, Inc. - Installed in: 8 registered aircraft - Page: https://openairdocs.org/engine/continental-tsio-520-ae 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 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 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 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 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 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) (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-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 ## Registered aircraft (8) - [N217ME](https://openairdocs.org/aircraft/N217ME): [Air Research Ca Inc](https://openairdocs.org/faa-owner/AIR%20RESEARCH%20CA%20INC), [Torrance, CA](https://openairdocs.org/faa-place/CA/Torrance), built 1983, S/N T30300188 - [N303MB](https://openairdocs.org/aircraft/N303MB): [N303mb Corp Trustee](https://openairdocs.org/faa-owner/N303MB%20CORP%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1982, S/N T30300157 - [N303WA](https://openairdocs.org/aircraft/N303WA): [Wacker Logistics LLC](https://openairdocs.org/faa-owner/WACKER%20LOGISTICS%20LLC), [Naples, FL](https://openairdocs.org/faa-place/FL/Naples), built 1984, S/N T30300265 - [N303WW](https://openairdocs.org/aircraft/N303WW): [Qualitair LLC Trustee](https://openairdocs.org/faa-owner/QUALITAIR%20LLC%20TRUSTEE), Michelstadt, built 1983, S/N T30300226 - [N4725C](https://openairdocs.org/aircraft/N4725C): [Continental Aerospace Technologies Inc](https://openairdocs.org/faa-owner/CONTINENTAL%20AEROSPACE%20TECHNOLOGIES%20INC), [Mobile, AL](https://openairdocs.org/faa-place/AL/Mobile), built 1982, S/N T30300118 - [N609DS](https://openairdocs.org/aircraft/N609DS): [Tj Air Holdings Inc](https://openairdocs.org/faa-owner/TJ%20AIR%20HOLDINGS%20INC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1981, S/N T30300025 - [N700KB](https://openairdocs.org/aircraft/N700KB): [California Oregon Development LLC](https://openairdocs.org/faa-owner/CALIFORNIA%20OREGON%20DEVELOPMENT%20LLC), [Portland, OR](https://openairdocs.org/faa-place/OR/Portland), built 1983, S/N T30300211 - [N954JC](https://openairdocs.org/aircraft/N954JC): [Skyline Aviation Services LLC](https://openairdocs.org/faa-owner/SKYLINE%20AVIATION%20SERVICES%20LLC), [Miramar, FL](https://openairdocs.org/faa-place/FL/Miramar), built 1983, S/N T30300209 ## NTSB investigations (1) 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 CEN13WA527](https://openairdocs.org/ntsb/CEN13WA527), Sep 4, 2013: Cessna T303 (N289CW), Jersey, substantial damage, 2 fatal ## FAA accident and incident reports (2) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Incident 20260418004649I](https://openairdocs.org/incident/20260418004649I), Apr 18, 2026: Cessna T303 (N303MB), Gainsville, FL, Minor damage. On April 18, 2026, a Cessna 303 landed at Gainesville Regional Airport. After landing, while taxiing on taxiway alpha, the aircraft’s left main landing gear… - [Incident 19850612033929I](https://openairdocs.org/incident/19850612033929I), Jun 12, 1985: Cessna T303 (N4725C), Fort Wayne, IN. Smoke from nose compartment after runup. Heater shut off and evacuated. Heater blower bearing failed. ## Service difficulty reports (16) As reported by operators and repair stations, by the model named in the report. - [SDR 2017FA0000495](https://openairdocs.org/sdr/2017FA0000495), Jul 29, 2017: SHAFT. FAILED. PILOT NOTICED SMOKE COMING FROM THE LEFT ENGINE EXHAUST DURING CRUISE FLIGHT. PERFORMED A PRECAUTIONARY LANDING. INSPECTION REVEALED THAT THE TURBOCHARGER SHAFT - [SDR CA070511008](https://openairdocs.org/sdr/CA070511008), May 2, 2007: CRANKCASE. CRACKED. (CAN) SUDDEN DROP OF OIL PRESSURE DURING FLIGHT TO THE BOTTOM OF THE GREEN ON OIL PRESSURE GAUGE. CONTINUED FLIGHT WITH SAFE LANDING. CRACK NOT FOUND BY NDT. BO - [SDR CA050531001](https://openairdocs.org/sdr/CA050531001), May 25, 2005: MAIN BEARING. FAILED. (CAN) THE AIRCRAFT CAME IN WITH A REPORT OF LOW OIL PRESSURE. THE OIL FILTER WAS PULLED AND INSPECTED WITH NO FAULTS FOUND, THE OIL PRESSURE RELIEF VALVE WAS RE - [SDR CA050516005](https://openairdocs.org/sdr/CA050516005), May 13, 2005: LINE. MISINSTALLED. (CAN) AN ALTERNATOR BELT HAD FAILED ON THE PREVIOUS FLIGHT AND HAD BEEN REPLACED. THIS REQUIRED THE REMOVAL OF THE ENGINE DRIVEN FUEL PUMP PRESSURE RETURN LINE. - [SDR CA041124012](https://openairdocs.org/sdr/CA041124012), Nov 22, 2004: CAMSHAFT. SHEARED. (CAN) THE ENGINE LOST POWER ON CLIMB-OUT OF CALGARY. THE PILOT FEATHERED THE PROP AND RETURNED TO CALGARY. THE ENGINE WAS GROUND RUN AND THE PROP GOVERNOR WAS F - [SDR CA040518005](https://openairdocs.org/sdr/CA040518005), May 6, 2004: LINE. RESTRICTED. (CAN) DURING CRUISE FLIGHT, PILOT SELECTED CROSSFEED FOR RT ENGINE. SHORTLY AFTERWARDS, THE RT ENGINE LOST POWER/FUEL FLOW. SELECTOR WAS RETURNED TO NORMAL, AND - [SDR CA040518006](https://openairdocs.org/sdr/CA040518006), May 6, 2004: NEEDLE. STUCK. (CAN) PILOT REPORTED THAT LT TACH NEEDLE WAS STUCK AT 2400 RPM. INDICATOR REPLACED AND TESTED SERVICEABLE WITH NEW GAUGE. INTERNAL PROBLEM WITH GAUGE, SENT TO R - [SDR ID42004F00000](https://openairdocs.org/sdr/ID42004F00000), Feb 20, 2004: MOUNT. CRACKED. DURING AN ANNUAL INSPECTION THE IB LOWER ENGINE MOUNT LEG WAS FOUND CRACKED ON THE LT ENGINE. AIRCRAFT TT WAS 4391.8. ENGINE TIME 685. THE CRACK WAS ABOUT 1.125 - [SDR AUS20031151](https://openairdocs.org/sdr/AUS20031151), Nov 12, 2003: PISTON. CRACKED. (AUS) PISTON PN 646311 CRACKED IN BOSS. PISTON PIN PN 643846 BROKEN. - [SDR CA030523005](https://openairdocs.org/sdr/CA030523005), May 21, 2003: FORK. SHEARED. (CAN) PILOT REPORTS GEAR WOULD NOT RETRACT ON TAKE OFF. HE ELECTED TO LEAVE DOWN FOR FLIGHT MAINTAINING PROPER SPEED.ON LANDING TRUCKS WERE REQUESTED BUT NO EME - [SDR CA030521008](https://openairdocs.org/sdr/CA030521008), May 15, 2003: TIRE. BLOWN. (CAN) ON LANDING THE RT MAIN WHEEL BLEW. A/C WAS STOPPED SAFELY ON THE RUNWAY AND THEN TOWED OFF ONTO THE NEAREST TAXIWAY. AFTER THE RIM WAS INSPECTED AND THE T - [SDR AUS20010412](https://openairdocs.org/sdr/AUS20010412), Apr 23, 2001: NUT. WRONG PART. (AUS) LH WING FUEL TANK LEAKING. INVESTIGATION FOUND THAT THE FUEL TANK PANEL ANCHOR NUTS WERE THE INCORRECT TYPE. THE CORRECT NUTS PNO NAS1473A3 ANCHOR NUTS AR - [SDR 20010322CW006](https://openairdocs.org/sdr/20010322CW006), Feb 22, 2001: CAMSHAFT. FAILED. ENGINE FAILED ON TAKE OFF, AIRCRAFT WAS AIRBORN. OWNER WAS ABLE TO MAKE A SAFE LANDING. FOUND ENGINE TO HAVE NO COMPRESSION. REMOVED ROCKER BOX COVERS, FOUND ON - [SDR CA990310065](https://openairdocs.org/sdr/CA990310065), Jan 11, 1999: BELLCRANK. CRACKED. (CAN) THE NOSE STEERING BELLCRANK WAS FOUND CRACKED/BROKEN BETWEEN ATTACH FLANGES. NO OTHER FAULTS FOUND DURING FLEET CHECK. - [SDR AU960342](https://openairdocs.org/sdr/AU960342), Feb 28, 1996: BALANCE WEIGHT. MISSING. (AUS) RUDDER MASS BALANCE WEIGHT MISSING - [SDR AU960344](https://openairdocs.org/sdr/AU960344), Feb 28, 1996: VALVE GUIDE. WORN. (AUS) NO2, NO4 AND NO6 CYLINDER EXHAUST VALVE GUIDES WORN BEYOND LIMITS ## STCs that may be installed (OpenAirDocs) (29) 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 TSIO-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 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 SE70RM](https://openairdocs.org/stc/SE70RM): Installation of compressor bracket. Air Comm Corporation - [STC SE1186SW](https://openairdocs.org/stc/SE1186SW): Regrooving of pistons P/N 631475 or P/N 632585. Continental Motors, Inc - [STC SE5820SW](https://openairdocs.org/stc/SE5820SW): Installation of Airmotive exhaust valve, P/N AEC-637781. Continental Motors, Inc. Lists TSIO-520 Series - [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc. Lists TSIO-520 Series - [STC SE3631SW-D](https://openairdocs.org/stc/SE3631SW-D): Cylinder modifications. RAM Aircraft Limited Partnership - [STC SE444GL](https://openairdocs.org/stc/SE444GL): Incorporation of a fuel flow transducer. Shadin Avionics - [STC SE4651SW](https://openairdocs.org/stc/SE4651SW): Installation of Slick pressurized magnetos. Also eligible on Teledyne Continental TSIO-520-NB engines modified per STC SE4327SW. RAM Aircraft Limited Partnership - [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 SE09261SC](https://openairdocs.org/stc/SE09261SC): Modify engine to increase power output rating from 310 hp to 335 hp, install Garrett/AlliedSignal TA-81 turbocharger, RAM intercooler, RAM economy camshaft, RAM oil pump pickup tube, RAM forged pistons with gapless rings, and 0.02 inch undersized crankshaft. RAM Aircraft Limited Partnership. Lists TSIO-520 Series - [STC SE3631SW](https://openairdocs.org/stc/SE3631SW): Cylinder modification. RAM Aircraft Limited Partnership. Lists TSIO-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 TSIO-520 Series - [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 TSIO-520 Series - [STC SE4382NM](https://openairdocs.org/stc/SE4382NM): Installation of American Aviation intercooler assembly. American Aviation Inc - [STC SE09289SC](https://openairdocs.org/stc/SE09289SC): Installation of modified fuel injector nozzles. General Aviation Modifications, Inc. Lists TSIO-520 Series - [STC SE09319SC](https://openairdocs.org/stc/SE09319SC): Modify oil pan adding a new oil sump drain. Texas Skyways Inc. Lists TSIO-520 Series - [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector. Aviation Development Corporation - [STC SE8687SW](https://openairdocs.org/stc/SE8687SW): Regrooving of pistons P/N 631475 or P/N 632585. Capehart Industries, Inc. Lists TSIO-520 Series - [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp. Lists TSIO-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 TSIO-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 TSIO-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 TSIO-520 Series - [STC SE44WE](https://openairdocs.org/stc/SE44WE): Use of Kling Aviation Oil, Specifications KL-100, KL-200 and KL-300 in Continental and Lycoming engines. Kling Oil Company. Lists TSIO-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.