JASC 8520

Service difficulty reports · 2,213

Reports filed under 8520 · Reciprocating Engine Power Section, newest first.

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 jasc_code = '8520'
  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 2026FA0000818Drive Gear · spalledFACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 ALTERNATOR. THE DAMAGE HAS INCLUDED VARYING DEGREES OF SPALLING, GALLING, AND CHIPPING OF THE GEAR TEETH.Oct 6, 2026 · Cirrus SR22SDR 2026FA0000807Drive Gear · spalledFACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 ALTERNATOR. THE DAMAGE HAS INCLUDED VARYING DEGREES OF SPALLING, GALLING, AND CHIPPING OF THE GEAR TEETH.Oct 1, 2026 · Cirrus SR22TSDR 2026FA0000820Drive Gear · spalledFACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 ALTERNATOR. THE DAMAGE HAS INCLUDED VARYING DEGREES OF SPALLING, GALLING, AND CHIPPING OF THE GEAR TEETH.Sep 24, 2026 · Cirrus SR22SDR 8TNC202609060001Case · crackedTHIS ENGINE HAS BEEN REMOVED FROM SERVICE DUE TO A CRACK ON THE RT SIDE OF THE CASE BELOW THE NR 3 CYLINDER AT THE FORWARD LOWER CYLINDER HOLD DOWN NUT. CRACK STARTS FROM THE FORWARD LOWER CYLINDER HOLD DOWN NUT AND CONTINUES ABOUT 3 INCHES. ENGINE REMOVED FSep 6, 2026 · N81052 · Piper PA32301SDR 2026FA0000817Drive Gear · spalledFACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 ALTERNATOR. THE DAMAGE HAS INCLUDED VARYING DEGREES OF SPALLING AND GALLING OF THE GEAR TEETH.Jul 15, 2026 · Cirrus SR22TSDR 2026FA0000819Drive Gear · spalledFACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 ALTERNATOR. THE DAMAGE HAS INCLUDED VARYING DEGREES OF SPALLING AND GALLING OF THE GEAR TEETH.Apr 29, 2026 · Cirrus SR22TSDR 8HBR20260426081Plug · wornWHILE COMPLYING WITH LYCOMING SB667A, ONE WRIST PIN PLUG ON CYLINDER #2 WAS FOUND EXCESSIVELY WORN WITH A HOLE IN THE CENTER OF THE PLUGApr 23, 2026 · N89312 · Cessna 152SDR 2026FA0000214Bushing Sleeve · migratedFOUND BRONZE PARTICLES IN FULL FLOW FILTER AT INSPECTION. TRACED TO MIGRATING CONNECTING ROD BUSHINGS ON ALL 4 RODSMar 25, 2026 · N1470 · Cessna 172MSDR NX422026031600013Crankcase · gougedUPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANKCASE HALF ON ALL FOUR THRU STUD BORE LOCATIONS. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PADS JUST INSIDE THE THRU STUD BORES. SIMILAR DAMAGE OMar 13, 2026 · N923ER · Cessna 172SSDR NX422026031600012Stud · damagedUPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON ONE OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DIPLSACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUD. A RELEVANT INDICATION IS SEEN UNDER MAGNETIC PARTICLE INSPECTION. THE LEFMar 13, 2026 · N979ER · Cessna 172SSDR NX422026031600011Crankcase · gougedUPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANKCASE HALF TO THREE THRU STUD BORE LOCATIONS. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PADS JUST INSIDE THE THRU STUD BORES. SIMILAR DAMAGE ON OMar 13, 2026 · N979ER · Cessna 172SSDR HYIA20260327008Crankcase · crackedDURING INSPECTION, WHILE TROUBLESHOOTING AN OIL LEAK, A CRACK FOUND IN THE ENGINE CRANK CASE. THE ENGINE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.Feb 27, 2026 · N843CA · Tecnam P2012SDR NX422026022700010Stud · displacedUPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON ONE OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUD. THE DAMAGE IS MINOR BUT DUE TO THE SIMILAR LOCATION AND SEVERITY OF THE DFeb 24, 2026 · N964ER · Cessna 172SSDR NX422026022700009Crankcase · gougedUPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO ONE THRU STUD LOCATION. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PAD INSIDE THE THRU STUD BORE. SIMILAR DAMAGE ON OTHER ENGINES WAS PREVFeb 24, 2026 · N964ER · Cessna 172SSDR NX422026021800008Stud · displacedUPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON 2 OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUD. THE DAMAGE IS MINOR BUT DUE TO THE SIMILAR LOCATION AND SEVERITY OF THE DAMFeb 17, 2026 · N909ER · Cessna 172SSDR NX422026021800007Crankcase · gougedUPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO ALL 4 THRU STUD LOCATIONS. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PAD INSIDE THE THRU STUD BORE. ON THREE OF THE THRU STUD BORES THE DFeb 17, 2026 · N909ER · Cessna 172SSDR NX422026021800006Stud · displacedUPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON 1 OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUD. THE DAMAGE IS MINOR BUT DUE TO THE SIMILAR LOCATION AND SEVERITY OF THE DAMFeb 16, 2026 · N934ER · Cessna 172SSDR NX422026021800005Crankcase · gougedUPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO ALL 4 THRU STUD LOCATIONS. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PAD INSIDE THE THRU STUD BORE. IN ADDITION, 1 OF THE THRU STUDS HAVEFeb 16, 2026 · N934ER · Cessna 172SSDR NX422026020600004Stud · displacedUPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON 2 OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUDS. THE DAMAGE APPEARS TO BE VERY MINOR BUT DUE TO THE SIMILAR LOCATION AND SEFeb 2, 2026 · N958ER · Cessna 172SSDR NX422026020600003Crankcase · gougedUPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO THE UPPER MIDDLE FLOATING THRU STUD LOCATION. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PAD INSIDE THE THRU STUD BORE. IN ADDITION, 2 OF Feb 2, 2026 · N958ER · Cessna 172SSDR NX422026020600001Crankcase · gougedUPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE ON ALL 4 OF THE FLOATING THRU STUD LOCATIONS. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PAD INSIDE THE THRU STUD BORES. IN ADDITION, 2 OF THFeb 2, 2026 · N963ER · Cessna 172SSDR NX422026020600002Stud · displacedON DISASSEMBLY FOR ITS 1ST OVERHAUL, DAMAGE FOUND ON 2 OF THRU STUDS. DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THREADED PORTION ON SHOULDER OF THRU STUDS. ON 1 THRU STUD. DAMAGE IS SEVERE WITH DISPLACED METAL FROM SMALLER NECKED DOWN PORTION OF STUD UP TO Feb 2, 2026 · N963ER · Cessna 172SSDR 2025FA0000775Crankcase · gougedDURING DISASSEMBLY OF THE ENGINE FOR OVERHAUL DAMAGE WAS FOUND ON THE LEFT CRANKCASE HALF AT EACH OF THE 4 THRU STUD CYLINDER PAD LOCATIONS. THE DAMAGE APPEARS TO BE A GOUGE DISPLACING SOME OF THE ALUMINUM CRANKCASE PAD DOWN INTO EACH OF THE THRU STUD BORE LOCNov 20, 2025 · N957ERSDR HYIA20260327003Case · crackedDURING TROUBLESHOOTING FOR AN OIL LEAK DURING SCHEDULED INSPECTION, A CRACK IN THE ENGINE CASE WAS FOUND IN THE AREA OF THE #1-CYLINDER BOTTOM MOUNT. THIS ENGINE WAS REPLACED WITH NO FURTHER ISSUES.Nov 5, 2025 · N508CA · Tecnam P2012SDR 2025FA0000457Piston · crackedHIGH OIL CONSUMPTION REPORTED. BORESCOPE INSPECTION REVEALED PISTON DAMAGE. CYLINDER REMOVED AND FOUND PISTON CRACKED AND SEPARATED IN HALF. INSPECTION OF ENGINE INTERIOR REVEALED SUSPICIOUS PISTON ON OPPOSING CYLINDER. REMOVED CYLINDER AND FOUND CRACK FORMINGJul 8, 2025 · Cessna 172GSDR 2025FA0000409Crankcase · crackedCASE CRACKED AT TOP BASE OF #2 CYLINDER, LEAKING OILJun 18, 2025 · N3080E · Cessna 172NSDR 2025FA0000383Camshaft · gougedAN UNACCEPTABLE OIL SAMPLE LEAD TO A RECOMMENDATION BY AN OUTSIDE COMPANY TO HAVE AN INSPECTION OF THE CAMSHAFT AND LIFTERS PERFORMED. WE PERFORMED THESE INSPECTIONS AND FOUND A GOUGE ON THE #6 INTAKE LOBE ON THE CAMSHAFT. A PICK CAN BE CAUGHT IN THIS GOUGE THJun 3, 2025 · N486W · Cirrus SR22TSDR N3XR202505230001Piston · crackedWHEN COMPLYING WITH AD2024-19-10 / MSB-E4-043 (RTBORESCOPE) INSPECTION, THE #2 PISTON WAS FOUND CRACKED.May 21, 2025 · N316ER · Diamon DA42SDR N3XR20250507001Piston · crackedWHILE COMPLYING WITH AD2024-19-10 / MSB-E4-043 (RTBORESCOPE INSPECTION), THE #2 PISTON ON THE RIGHT ENGINE WAS FOUND CRACKED. THE ENGINE WAS REPLACED.May 2, 2025 · N313ER · Diamon DA42SDR 2025FA0000113Connecting Rod · bindingDURING FLIGHT THE AIRCRAFT OWNER/OPERATOR NOTICED A DRONING VIBRATION AT CRUISE. UPON LANDING, ALL CYLINDERS WERE INSPECTED AND BORE-SCOPED. MOVED PROPELLER BACK AND FORTH AND HEARD A CLUNKING NOISE, NARROWED DOWN TO CYLINDER #2 PISTON SHOWING SIGNS OF EXCESSIJan 23, 2025 · N623ES · Cirrus SR22SDR 2025FA0000000Nut · damagedNHDO ASSEMBLING COMCC??NG RODS TO CRANKSHAFT DURING OVERHAUL. II WAS NOTICED THAT T NUT WAS NOT SLMNG FLUSH TO ITS BEARING SURFACE. THE NUT HAD BEEN RUN DOWN FINGER TIGHT, PRIOR TO TORQUING LOOKING AT THO NUT, 1T IS OBVIOUS THAT THO NUT WAS NOT 1N THE PROPER OJan 3, 2025SDR 2024FA0000979Crankcase · damagedAT CRUISE ALTITUDE, AN OIL PRESSURE FLUCTUATION WAS OBSERVED ON NO.1 ENGINE INSTRUMENTS. ALSO NOTICED A SMALL OIL STREAK ON NO. 1 ENGINE COWL. DECISION WAS IMMEDIATELY MADE TO RETURN TO BASE, FOR FURTHER INVESTIGATION BY ENGINEERS.Dec 15, 2024 · N41148 · Piper PA31350SDR 7L7R2024102100779Piston · damagedECU A AND B FAIL DURING INITIAL CLIMB, AND SIGNIFICANT LOSS OF POWER. DURING SUBSEQUENT BORESCOPE INSPECTION FOUND A HOLE IN THE #3 PISTON. PREVIOUS BORESCOPE INSPECTION WAS PERFORMED @ 787.4 ETSN.Oct 6, 2024 · N946LSDR N3XR20240903004Piston · crackedDURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043, THE #2 PISTON IN THE LEFT ENGINE WAS FOUND CRACKED.Aug 30, 2024 · N311ER · Diamon DA42NGSDR N3XR20240903003Piston · crackedDURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043, THE #4 PISTON IN THE RIGHT ENGINE WAS FOUND CRACKED.Aug 30, 2024 · N304ER · Diamon DA42NGSDR N3XR20240903002Piston · crackedDURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043, THE #4 PISTON IN THE RIGHT ENGINE WAS FOUND CRACKED.Aug 30, 2024 · N304ER · Diamon DA42NGSDR N3XR202409030001Piston · crackedDURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043/0 THE #3 PISTON WAS FOUND CRACKED.Aug 30, 2024 · N304ER · Diamon DA42NGSDR N3XR202408290316Piston · crackedWHILE PERFORMING THE INSPECTION OF DIAMOND MSB-E4-043 ENGINE (BORESCOPE INSPECTION) ON THE RIGHT ENGINE, THE PISTON IN CYLINDER #1 WAS FOUND CRACKED ON THE CROWN.Aug 29, 2024 · N316ER · Diamon DA42NGSDR 2024FA0000628Nut · missingFORWARD MOST THROUGH CASE BOLT BEHIND CRANKSHAFT SEAL AND #1 MAIN BEARING, TOP STUD AND NUT MISSING. BOTTOM BOLT AND NUT LOOSE. LYCOMING WANTED ENGINE BACK IN CASE MAIN BEARING SPUN.Aug 15, 2024 · N288BL · Piper PA28181SDR 2024FA0000594Lifter · corrodedRECEIVED FACTORY REMANUFACTURED TSIO520 R9B FROM CAT. PRIOR TO REMOVING THE ENGINE FROM THE SHIPPING CRATE A PITTED AND MARRED LIFTER WAS DISCOVERED. ENGINE SN 1046657. CAT RETURNED THAT ENGINE AND SENT ME A REPLACEMENT ENGINE SN 1047255. PRIOR TO INSTALLAAug 13, 2024SDR 2024FA0000568Flywheel · fragmentedDUAL ECU FAIL AND POWER LOSS IN FLIGHT. FOUND FLYWHEEL FAILURE WHICH APPEARS TO HAVE STARTED WITH SPRING FAILURE.Aug 6, 2024 · N366LSDR 2024FA0000435Case · crackedON CLIMB TO CRUISING ALTITUDE PIC FELT AN ENGINE VIBRATION AND DECIDED TO TURN BACK TO KARG. ON TURN BACK TO DEPARTURE AIRPORT OIL PRESSURE DROPPED TO "0" AND ENGINE SEIZED. POST EMERGENCY LANDING, ENGINE COWLING WAS REMOVED, HOLE IN CRANKCASE FOUND ON FORWARDJun 7, 2024 · N15871 · Piper PA28180SDR N3XR202406120001Piston · crackedLEFT ENGINE POWER HAD 3% & RPM(100RPM) FLUCTUATION. VISIBLE ENGINE OIL LEAKING OUT OF AIR OUTLETS. DIVERTED TO XXXX ON THE GROUND, POWER 10%FLUCTUATION RPM. INVESTIGATION REVEALED THAT THE #3 PISTON WAS CRACKED AND A HOLE HAD DEVELOPED AT THE 3 O'CLOCK POSITIOJun 4, 2024 · N316ER · Diamon DA42SDR 2024FA0000422Connecting Rod · failedENGINE WAS DISASSEMBLED FOR INSPECTION DUE TO PROPELLER STRIKE. UPON DISASSEMBLY IT WAS NOTED THAT THE CONNECTING ROD BUSHING HAS MIGRATED PARTLY OUT OF THE BORE ON THE SMALL END OF CONNECTING ROD #2, #3, & #5. THIS IS THE THIRD TIME THAT WE HAVE SEEN THIS PJun 4, 2024 · N522RK · Cirrus SR22TSDR 2024FA0000141Rod Bolt · shearedUNUSUAL CLANGING SOUNDS HEARD DURING A TRAINING FLIGHT. IMMEDIATELY TURNED TO BASE AND GAINED ALTITUDE TO ASSURE SAFE LANDING AT JNX. AFTER 2 MILES, A DUAL ECU FAIL BECAME ACTIVE DUE TO LOW OIL PRESSURE. CONTINUED FLIGHT AT IDLE. AT 3 MILES FROM BASE, OIL PRESFeb 9, 2024 · N517BL · Diamon DA40NGSDR 2024FA0000140Bolt · shearedSIGNIFICANT OIL LOSS AND LOSS OF OIL PRESSURE ON TAKEOFF. FADEC SYSTEM AUTOMATICALLY SHUT DOWN ENGINE DUE TO OIL PRESSURE LOSS. PILOT LANDED SAFELY ON RUNWAY AND TAXIED OFF OF ACTIVE RUNWAY WITHOUT ISSUES. UPON VISUAL INSPECTION, FOUND THERE TO BE A 2 IN DIAMEFeb 8, 2024 · N517BL · Diamon DA42NGSDR N3XR202401160001Piston · crackedON TAKE-OFF, THE CREW NOTICED A LOW OIL PRESSURE INDICATION VIA A WARNING ON THE G1000 FOR THE RIGHT ENGINE. AN EMERGENCY WAS DECLARED AND THE CREW LANDED SUCCESSFULLY. AN INSPECTION OF THE RIGHT ENGINE REVEALED OIL COVERING THE RIGHT WING ON BOTH SIDES OF THEJan 11, 2024 · N304ER · Diamon DA42SDR 2024FA0000003Rocker Boss · brokenPILOT REPORTED SUDDEN VIBRATION IN FLIGHT, FOLLOWED BY LOSS OF CHT/EGT ON CYLINDERS #1, #3, #5, AND LOSS OF ENGINE OIL PRESSURE. AFTER LANDING AND REMOVING ENGINE COWLING IT WAS DISCOVERED THAT THE #3 CYLINDER EXHAUST ROCKER ARM SHAFT MOUNT STRUCTURE HAD BROKJan 3, 2024 · Mooney M20TNSDR 2023FA0000854Piston · brokenTHE AIRCRAFT WAS IN CRUISE AT APPROXIMATELY 7500’ WHEN THEY EXPERIENCED SOME ENGINE ROUGHNESS, A LOSS OF OIL PRESSURE AND THE ENGINE QUIT. THEY LANDED AT THE GEORGETOWN, SC AIRPORT AT APPROXIMATELY 5:30PM. MAINTENANCE FOUND OIL ON THE AIRCRAFT, A HOLE IN THE SDec 22, 2023 · N445L · Diamon DA40NGSDR 2023FA0000837Pushrod · damagedDURING SB388C, EXHAUST VALVE GUIDE INSPECTION FOUND 4EA PUSH RODS P/N 15F28835-10 & 4EA ROCKERS P/N 17F19357 TO HAVE HEAVY SCUFF - SCORING. ENGINE TT: 2741.1 SINCE FACTORY REBUILT.Dec 16, 2023 · N734BB · Cessna 172N
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