Mooney M20J

Service difficulty reports · 185

Newest first. General aviation reporting is voluntary.

Query with SQL
duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE aircraft_model_key = 'M20J'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR 2026FA0000799Door · brokenAIRCRAFT WAS IN CRUISE AT 6000' WHEN ALL 4 CYLINDERS EXPERIENCED ABNORMAL EGT RISE, SLIGHT REDUCTION IN CHT, AND ENGINE SURGING. DIVERTED TO NEAREST AIRPORT. REMOVED MAIN ENGINE AIR FILTER AND DISCOVERED 600118-015 ALTERNATE AIR DOOR WITH CRACKS EMANATING FRAug 24, 2026 · N1067G · Mooney M20J · Engine Anti-Icing SystemSDR 2026FA0000279Intake Valve · brokenPILOT REPORTED DURING CRUISE OPERATION A SUDDEN ENGINE ROUGHNESS WITH A LOSS OF POWER. EMERGENCY LANDING REQUESTED AND COMPLETED AT KOXR. INSPECTION OF ENGINE FOUND CYLINDER NUMBER 3 WITH HOLE THROUGH INTAKE PORT AND REAR BAFFLE. BORESCOPE INSPECTION REVEALED Apr 20, 2026 · N452X · Mooney M20J · Reciprocating Engine Cylinder SectionSDR 2026FA0000810Coil · damagedENGINE CYLINDER NR 4 WAS EXPERIENCING INTERMITTENT MISFIRING. FOUND LT COIL WAS GROUNDING TO ITS MOUNT THROUGH A SMALL PINHOLE IN BOTTOM OF THE COIL CASE, ELECTROAIR STATED THAT IT WAS TESTED AND "THERE WAS NOTHING WRONG WITH IT". THE COIL WAS RETURNED AND A Apr 15, 2026 · N9140X · Mooney M20J · Low Tension CoilSDR 2026FA0000302Coil · arcedENGINE CYLINDER NR 4 WAS EXPERIENCING INTERMITTENT MISFIRING. FOUND L/H COIL WAS GROUNDING TO ITS MOUNT THROUGH A SMALL PINHOLE IN BOTTOM OF THE COIL CASE.THE COIL WAS RETURNED TO ELECTROAIR FOR EVALUATION. ELECTROAIR STATED THAT IT WAS TESTED AND "THERE WAS NMar 10, 2026 · N9140X · Mooney M20J · Low Tension CoilSDR 2025FA0000636Impulse Coupling · failedI HAVE NOW HAD 2 QUALITY AICRAFT ACCESSORIES (QAA/HARTZELL)-OVERHAULED SLICK 4372 MAGNETOS W/ IMPULSE COUPLINGS VIOLENTLY SELF-DESTRUCT IN THE SPAN OF 200 HOURS. HARTZELL, THE PARENT COMPANY OF QAA, HAS INFORMED ME THAT BOTH MAGNETOS HAD BRAND NEW OEM CHAMPIOAug 26, 2025 · N374SM · Mooney M20J · Magneto/DistributorSDR 2025FA0000149Rocker Cover · crackedROCKER BOX COVER ON NUMBER 5 CYLINDER HEAD LEAKING OIL THROUGH HAIRLINE CRACK AT THE STAMPING MARK. THE LINE THAT UNDERLINES THE STAMPED "LYCOMING" LETTERS HAS A CRACK ALLOWING SLOW SEEPAGE OF ENGINE OIL AT ALL TIMES.Mar 5, 2025 · N343DM · Mooney M20J · Reciprocating Engine Cylinder SectionSDR 2022FA0000039Actuator · usedPRIOR TO LANDING THE PILOT RECEIVED AN AUDIBLE GEAR WARNING HORN, BUT THE GEAR INDICATOR SHOWED A GREEN LIGHT. THE LANDING GEAR EXTENDED BUT FAILED TO LOCK DUE TO THE ELECTROMECHANICAL ACTUATOR CAUSING THE CIRCUIT BREAKER TO POP. THE PILOT COULD NOT GET THE Jan 21, 2022 · N4815H · Mooney M20J · Landing Gear ActuatorSDR 2020FA0000508Attach Bracket · brokenTHE TAIL TRIM ASSIST BRACKET BROKE ALONG THE MOUNTING FLANGE EDGE WHERE THE PUSH PULL ROD FOR ASSIST MECHANISM ATTACHES TO THE TAIL CONE.Sep 18, 2020 · N201ZT · Mooney M20J · Elevator Control SystemSDR F3OR202006160001Gyro · false indicationINTERMITTENT ATTITUDE FAILURE OF THE KI300 HORIZON INDICATOR. PRIMARY ATTITUDE INDICATOR INTERMITTENTLY AND WITHOUT WARNING INDICATES ERRONEOUS PITCH AND ROLL ATTITUDES AND ALSO, WHEN INTERFACED TO THE AUTOPILOT CAUSES THE AUTOPILOT TO DEVIATE FROM ITS INTENDEMay 26, 2020 · N201AT · Mooney M20J · Attitude Gyro and Indicating SystemSDR JZYR2017062714126Crankshaft · brokenVERY LOUD POUNDING SOUND FROM THE CRANKCASE WHEN RUNNING. FOUND LARGE AMOUNTS OF FERROUS AND NON-FERROUS MATERIAL IN THE OIL FILTER, METAL AT THE SCREEN TO THE GOVERNOR, AND LARGE CHUNKS OF METAL IN THE OIL SUCTION SCREEN. ENGINE WAS REMOVED FROM THE AIRCRAFT Jun 27, 2017 · N1021K · Mooney M20J · Reciprocating Engine Power SectionSDR 2017FA0000230Housing · crackedDURING AN ANNUAL INSPECTION, FOUND DUAL MAGNETO HOUSING CRACKED AT BOTH HOLD DOWN POINTS.May 1, 2017 · N91396 · Mooney M20J · Magneto/DistributorSDR 2016FA0000312Governor · failedGOVERNOR WAS BENCH CHECKED AND FOUND NOT TO BE ACHIEVING RPM ABOVE 1600. PRESSURE RELIEF WAS LOW. CUSTOMER REQUEST O/H OF THE GOVERNOR; AT THIS POINT, THE GOVERNOR WAS DISASSEMBLED AND FOUND TO HAVE INTERNAL DAMAGE OF THE PUMP CAVITY. DAMAGE FROM AN UNKNOWNJun 28, 2016 · N96CB · Mooney M20J · Propeller GovernorSDR 2016FA0000188Alternator · failedPLANE ARRIVED AT SHOP WITH 5 AMP ALT FIELD CIRCUIT BREAKER POPPED. INVESTIGATION REVEALED STATOR BURNED BLACK, FRIED, HOWEVER THE SLIP RINGS WERE PRODUCING A STRONG MAGNETIC FIELD THAT AT FIRST BLUSH MADE ALTERNATOR APPEAR OK. FURTHER CHECK DISCOVERED VOLTAGMar 1, 2016 · N1079S · Mooney M20J · AC InverterSDR 2015FA0000378Actuator · brokenPILOT TRIED TO LAND, BUT WAS UNABLE TO LOWER LANDING GEAR. PILOT FLEW BACK TO DEPARTURE AIRPORT AND TRIED MULTIPLE ATTEMPTS TO LOWER GEAR BUT WAS UNSUCCESSFUL. PILOT NOTED THE LANDING GEAR ACTUATOR CIRCUIT BREAKER WAS POPPING AND HAD TO TRY THE EMERGENCY LANAug 12, 2015 · N9142H · Mooney M20J · Landing Gear ActuatorSDR 2015FA0000320Bolt · bentAIRCRAFT MADE AN UNSCHEDULED LANDING ON A ROAD DUE TO LOSS OF OIL PRESSURE AND ENGINE BEGAN TO SHAKE VIOLENTLY AND LOST POWER. A LARGE HOLE WAS DISCOVERED IN THE CRANKCASE ABOVE THE NR 4 CYLINDER. INSPECTION OF ENGINE COMPONENTS ON THE LIMITED TEARDOWN BY THJul 14, 2015 · N121A · Mooney M20J · Engine (Reciprocating)SDR BQVD201506090001Ring · seizedNR 4 CYLINDER WAS REMOVED AND DISCOVERED THE FOLLOWING: OIL CONTROL RING WAS SEIZED IN PISTON. PISTON, PISTON BORES WORN IN AREA WHERE PIN RESIDES ON BOTH SIDES OF PISTON. NO WRIST PIN CAP WEAR FOUND. CONTACT BEING MADE BETWEEN PISTON SKIRT END SURFACE & CJun 5, 2015 · N60RP · Mooney M20J · Reciprocating Engine Power SectionSDR CA141016001Valve Spring · broken(CAN) AIRCRAFT WAS FLYING AT 3500AGL. AT APPROXIMATELY 18 MINUTES ENGINE BEGAN RUNNING ROUGH. PILOT CHECKED ALL INSTRUMENT, ALL WAS NORMAL EXCEPT NR 1 CYLINDER CHT WAS LOW, INDICATING FAILURE. AIRCRAFT BEGIN LOSING ALTITUDE AND FORTUNATELY LANDED SAFELY. DURIOct 10, 2014 · Mooney M20J · Reciprocating Engine Cylinder SectionSDR 9PRR2014FA0000444Bellcrank · wornDURING THE ANNUAL INSPECTION, ELEVATOR AFT BELLCRANK WAS NOTICED TO HAVE EXCESSIVE PLAY AT THE PIVOTING POINT AND BETWEEN THE TWO BRACKETS THAT MAKE UP THE ASSY. CONDITION IS FOUND BY MOVING THE ELEVATOR SURFACE BY HAND, FROM ITS DOWN POSITION TO 1 INCH IN TJun 26, 2014 · N444JJ · Mooney M20J · Elevator Control SystemSDR CA140328007Plunger · failed(CAN) LW10286 IDLER GEAR WITH FUEL PUMP LOBE AND SL61544 FUEL PUMP PLUNGER CONTACT FACES FAILED BOTH ITEMS INSTALLED NEW AT OVERHAUL. ENGINE TIME 248 TSOH.Mar 6, 2014 · Mooney M20J · Reciprocating Engine Power SectionSDR CA140328006Lifter · failed(CAN) NEW LW18840 CAMSHAFT AND NEW 15B26064 LIFTER BODIES FAILED. ENGINE FAILED AFTER OVERHAULED AT 248 HOURS.Mar 6, 2014 · Mooney M20J · Reciprocating Engine Power SectionSDR 4MAR2014022800125Hose · leakingPILOT REPORTED FUEL LEAK UNDER INSTRUMENT PANEL. DURING INVESTIGATION, FOUND THAT THE LINE FOR THE FUEL PRESSURE INDICATOR WAS LEAKING SIGNIFICANTLY INTO THE VOLTAGE REGULATOR. FLEXIBLE LINE WAS MANUFACTURED IN THE THIRD QUARTER OF 1991 AND WAS LEAKING DUE TFeb 21, 2014 · N201QT · Mooney M20J · Aircraft Fuel Distribution SystemSDR 2013FA0000745Terminal · corrodedERRATIC FUEL PRESSURE INDICATIONS WITH INTERMITTENT DROP TO ZERO PSI INDICATION. FOUND SMALL AMOUNT OF CORROSION UNDER TERMINAL STUD NUT AFFECTING RESISTANCE AND INDICATION.Oct 20, 2013 · N213CS · Mooney M20J · Engine Fuel System WiringSDR 2013FA0000612Control Rod · corrodedDURING VISUAL INSPECTION OF AILERON PUSH RODS AT ANNUAL INSPECTION, NOTED A BUBBLING IN PAINT AT THE BOTTOM OF THE LOW SPOT IN THE RT AILERON CONTROL ROD. REMOVED OXIDIZED RUSTY MATERIAL UNTIL THERE WAS A .250 X .125 OVAL HOLE IN THE BOTTOM OF THE STEEL RODOct 3, 2013 · N43JA · Mooney M20J · AileronsSDR 2013FA0000478Cylinder · damagedACFT MADE UNSCHEDULED STOP DUE TO A ROUGH ENGINE. FOUND NR 1 CYLINDER HAD BOTH REAR THRU STUDS BROKEN OFF, AND ALL FOUR SMALL STUDS BROKEN OFF. FOUND ALL BROKEN PARTS IN BAFFLING. INTAKE TUBE FOR NR 1 CYLINDER WAS FOUND WITH ONE BOLT MISSING AND THE OTHER Jul 26, 2013 · N201NU · Mooney M20J · Reciprocating Engine Cylinder SectionSDR 2013FA0000374Distributor Gear · looseMAGNETO CAUSED INTERMITTENT PROBLEMS FOR PILOT OVER THE 12 FLIGHT HOURS PRECEDING THE PARTS REMOVAL. PILOT REPORTED AN IN FLIGHT MAGENTO FAILURE. LANDED AND MAGNETO BEGAN WORKING AGAIN. REPAIR STATION FOUND CONTACTOR TANG ON DISTRIBUTOR GEAR LOOSE AND SPINJun 24, 2013 · N1067G · Mooney M20J · Magneto/DistributorSDR 2013FA0000298Bearing · wornDISTRIBUTOR BLOCK BEARING HAS EXCESSIVE PLAY/ WEAR.Feb 28, 2013 · N1075C · Mooney M20J · Magneto/DistributorSDR 2012FA0000661Gasket · unknownENGINE STARTED TO LEAK OIL. FOUND MAGNETO LOOSE TO ENGINE BUT HOLD DOWN BLOCKS WERE TIGHT TO THE ENGINE. THIS CAUSED DAMAGE TO THE MAGETO CASE. MEASURED A NEW GASKET AND ITS THICKNESS IS .034. THE NEW GASKETS, ARE THINNER THAN USED, WAS THE PROBLEM DUE TOSep 27, 2012 · N4305H · Mooney M20J · Magneto/DistributorSDR 2012FA0000534Bungee · jammedUPON PERFORMING A PREFLIGHT INSPECTION OF THE ELEVATOR FOR FREE AND CORRECT MOVEMENT THE ELEVATOR REMAINED STUCK IN THE FULL UP POSITION. PUSHING THE YOKE IN TOWARDS THE INSTRUMENT PANEL WAS NOT POSSIBLE, MINIMUM FORCE WAS USED TO TRY TO FREE THE CONTROL IN ORJun 6, 2012 · N9113J · Mooney M20J · Elevator Control SystemSDR 2012FA0000189Fuel Tank · leakingTHIS ACFT HAS BEEN REPEATEDLY REPAIRED TO CORRECT FUEL LEAKS. EVERY DRAIN HOLE HAS BEEN COVERED UP ALLOWING WATER AND FUEL TO BE TRAPPED IN THE OTBD BAYS. ALSO THE DRAIN VALVE RECEPTACLE DRAIN HOLES WERE COVERED WITH SEALANT CAUSING WATER TO COLLECT UP TO .5Feb 15, 2012 · N201SN · Mooney M20J · Fuel StorageSDR 2011FA0000532Tube · failedRT MAIN TIRE FLAT AT RUN UP AREA. REMOVED WHEEL. DISASSEMBLED AND FOUND BUTYL TYPE G15-G00-6 TUBE WITH HALF INCH LONG SLIT IN SIDEWALL. INSPECTED TIRE AND FOUND NO HOLES OR SLITS IN SIDEWALL AND NO ABNORMALITY ON INSIDE OF TIRE. THIS IS THE THIRD BUTYL TYPAug 3, 2011 · N60RP · Mooney M20J · Tire TubeSDR 2011FA0000531Battery · leakingELT REMOVED FOR FAR 91.207D INSP WHITE POWDER NOTED AT PARTING SURFACE BETWEEN TRANSMITTER AND BATTERY COMPARTMENT. DISASSEMBLED ELT AND FOUND 6 OF 8 D-CELL BATTERIES LEAKING AND RUPTURED. ANY ELT USING INDIVIDUAL UNSEALED BATTERIES SHOULD HAVE ALL BATTERIESAug 3, 2011 · N201SG · Mooney M20J · Emergency Locator BeaconSDR 2011FA0000451Magneto · intermittentOWNER REPORTED ENGINE WOULD START RUNNING ROUGH AFTER 15 TO 20 MINUTES OF FLIGHT, WITH CHECK OF RT MAGNETO GIVING LARGE RPM DROP. REPLACED MAGNETO AND ENGINE OPERATION NOW NORMAL. DISASSEMBLED MAGNETO AND FOUND THAT DISTRIBUTOR GEAR ELECTRODE FINGER WAS LOOSMay 12, 2011 · N2140L · Mooney M20J · Magneto/DistributorSDR FK8R201104210003Panel · crackedPILOT SEAT BACK REAR PANEL WAS FOUND CRACKED ON BOTH SIDES.Apr 21, 2011 · N5695K · Mooney M20J · Flight Compartment EquipmentSDR 2011FA0000252Blade · crackedPROPELLER WAS REMOVED FROM ACFT TO INVESTIGATE VIBRATION THAT HAD STARTED IN THE LAST 10 HOURS OF FLIGHT. BLADE, SN CK010, HAS SEVERE CRACK IN BLADE SHANK THAT GOES THROUGH TO INSIDE BORE.Apr 19, 2011 · N5702B · Mooney M20J · Propeller Blade SectionSDR 2011FA0000207Tube · bentUPON LANDING, THE LT LANDING GEAR COLLAPSED WITH NO GEAR UNSAFE INDICATION.Mar 28, 2011 · N888DF · Mooney M20J · Landing Gear Retraction/Extension SystemSDR CA100916005Alt Air Door · brokenTHE ACFT WAS TAKINGOFF FROM AIRFIELD WHEN THE ENGINE SUDDENLY LOST POWER. AN EMERGENCY WAS DECLARED. THE ENG MIXTURE WAS "LEANED OUT" AND SOME OF THE POWER WAS RESTORED. THE ACFT LANDED SAFELY BACK AT AIRFIELD. PART OF THE ENGINE ALTERNATE AIR DOOR WAS FOUSep 15, 2010 · Mooney M20J · Reciprocating Engine Front SectionSDR 2010FA0000169Throttle Cable · frayedTHROTTLE CABLE LOCKED IN FLIGHT, EXAMINATION FOUND PARTIAL FAILURE OF INTERNAL CABLE APPROX I5 CM FROM SWAG AT CONTROL KNOB END OF ASSY. BELIEVE FAILURE TO BE CAUSED BY TURNING KNOB WHILE TIGHTENING THROTTLE LOCK OR BY ATTEPTING TO USE A VENIER CONTROL.Jan 8, 2010 · N57651 · Mooney M20J · Power LeverSDR 2008FA0000918Magneto · malfunctionedSTARTED THE ACFT NORMALLY, TAXIED FROM HANGAR TO THE SELF-SERVE FUEL PUMP AND SHUTDOWN. FUELED ACFT. ATTEMPTED TO START THE ACFT AFTER FUELING. THE ENG TURNED OVER NORMALLY, BUT DID NOT FIRE. TROUBLESHOOTING REVEALED NO SPARK OUTPUT FROM THE MAGNETO. SENTDec 15, 2008 · N201TC · Mooney M20J · Magneto/DistributorSDR HN8R200800001Control Cable · brokenPROPELLER GOVERNOR CONTROL CABLE BROKE WHILE AIRCRAFT WAS ON GROUND.Jan 22, 2008 · N58102 · Mooney M20J · Propeller GovernorSDR 2007FA0000287Rivet · corrodedOWNER BROUGHT COWLINGS IN FOR REPAIR BECAUSE THE THROUGH SKIN RIVETS WERE CORRODING AND SHEARING OFF AT THE MFG HEAD AS EXHIBITED BY BLISTERING PAINT AT THE RIVET LOCATIONS. INSPECTION REVEALED MOST OF THE AD TYPE RIVETS WERE SEVERELY CORRODED BECAUSE THE COWMar 22, 2007 · N9156X · Mooney M20J · Engine Cowling SystemSDR 2006FA0001007Tee Fitting · looseDURING ANNUAL INSPECTION, FOUND PRECISE FLIGHT SVS V, SN 17245 (T-FITTING) LOOSE IN HOUSING. IF FITTING PULLED OUR YOU WOULD HAVE COMPLETE VACUUM SYS FAILURE. (K)Sep 8, 2006 · N5760Y · Mooney M20J · Fuselage Main, Attach FittingsSDR 2006FA0000675Bushing · spunFOUND DURING ANNUAL INSP, AN ALUMINUM BUSHING THAT IS LOCATED IN ACCESSORY CASE, WHERE MAGNETO DRIVE GEAR IS LOCATED HAD BECOME LOOSE IN CASE AND SPUN. FOUND THIS PROBLEM, WERE NOT ABLE TO INSTALL MAGNETO CORRECTLY, WHEN MAGNETO WAS INSTALLED, IMPULSE COUPLJul 3, 2006 · N3860H · Mooney M20J · Reciprocating Engine Rear SectionSDR 2050506Bushing · lack of lubeCRANKCASE WAS FIELD REPAIRED BY INSTALLING A BUSHING IN THE MAGNETO DRIVE GEAR BOSS. IT APPEARS THE OIL SUPPLY HOLE WAS NOT DRILLED IN THE BUSHING. THE BUSHING WAS STARVED FOR OIL AND METAL WAS FOUND IN THE OIL AND FILTER, THE BUSHING WAS LOOSE AND DAMAGED FROJun 21, 2006 · N386OH · Mooney M20J · Magneto/DistributorSDR 2006FA0000285Torque Tube · wornEMPENNAGE TRIM CONTROL TORQUE FOUND TO HAVE A DEEP GROOVE FROM WEARING ON CAT TRACK/GROMMET WHERE IT PASSES THROUGH STIFFENERS. THIS TUBE WAS ALSO WELD REPAIRED AT SOME TIME PREVIOUS THEN SWAPPED END FOR END SO TUBE WOULD WEAR ON A NEW SURFACE. IT APPEARS THMar 2, 2006 · N913JN · Mooney M20J · Elevator Control SystemSDR 2006FA0000176Exhaust Port · brokenINSTALLED POWER FLOW SYSTEMS EXHAUST STC NR SA02871AT AT TACH TIME 4646.93, AT TACH TIME 4768.70 THE NR 4 EXHAUST PORT HAD BROKE FREE OF MUFFLER. (K)Feb 15, 2006 · N799EC · Mooney M20J · Engine Collector/Tailpipe/NozzleSDR 2006FA0000094Transmitter · deterioratedELT TRANSMITTER WAS REMOVED DURING ANNUAL FOR BATTERY REPLACEMENT AND TESTING. UNIT HAD BATTERIES REPLACED. DURING TESTING THE UNIT MADE A WEAK SIGNAL OUTPUT AND HAS NO RANGE. USED DIFFERENT SET OF BATTERIES FOR RETESTING, SAME RESULTS. HOOKED BACK IN AIRCRJan 29, 2006 · N201CD · Mooney M20J · Emergency Locator BeaconSDR 2006FA0000095Transmitter · inoperativeELT TRANSMITTER WAS REMOVED DURING ANNUAL FOR BATTERY REPLACEMENT AND TESTING. UPON REMOVAL THE ELT WENT OFF WHEN TURNED UPSIDE DOWN. PIECES CAN BE HEARD RATTLING AROUNG INSIDE UNIT. SUSPECT G-SWITCH CAME LOOSE. THIS IS OUT 2ND EXPERIENCE OF SAME CONDITIONOct 29, 2005 · N201VE · Mooney M20J · Emergency Locator BeaconSDR 2005FA0001408Connector · disconnectedCONNECTOR CAME LOOSE FROM SLAVE CONTROLLER WHILE ON THE GROUND. HSI WAS NOW IN FREE GYRO (UNSLAVED) MODEL BUT THERE WAS NO (HDG) FLAG, HENCE GYRO SLOWLY DRIFTED WITHOUT WARNING TO PILOT. (K)Oct 2, 2005 · N4171H · Mooney M20J · Air Conditioning System WiringSDR 2005FA0000866Seat · crackedOPTIONAL VERTICALLY ADJUSTING PILOTS SEAT MOVED AFT DURING TAKEOFF, FOUND LT REAR BELLCRANK ASSY CRACKED WHICH DISTORTED SEAT ALLOWING SEAT PINS NOT TO FULLY ENGAGE SEAT TRACKS. INSTALLED A NEW BELLCRANK AND TUBE. NEW BELLCRANK HAD REINFORCEMENT STRAPS WELDEJun 10, 2005 · N5262F · Mooney M20J · Flight Compartment EquipmentSDR 2005FA0000123Cylinder · failedPILOT REPORTED THAT ENGINE BEGAN RUNNING ROUGH. READINGS FORM THE ENGINE MONITOR SHOWED THAT NR 2 CYLINDER FAILED. PILOT ELECTED TO LAND. INVESTIGATION SHOWED THAT BOTH UPPER THROUGH BOLTS AND BOTH UPPER CYLINDER ATTACH STUDS FOR NR 2 CYLINDER HAD FAILED ATNov 16, 2004 · N3925H · Mooney M20J · Reciprocating Engine Cylinder Section
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