Lycoming IO-540-AE1A5

Service difficulty reports · 924

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 engine_model_key = 'IO540AE1A5'
  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 2NVA20260622001Pump · inoperativeLOW FUEL PRESSURE LIGHT ILLUMINATED IN FLIGHT. NO ENGINE ROUGHNESS. VERIFIED ELECTRICAL FUEL PUMP NOT RUNNING. REPLACED ASSY PN D743-3 ASSY PER MM. THIS IS A COMMON ISSUE WITH THE R44 RAVEN II.Jun 22, 2026 · N488JB · Robsin R44RAVENII · Fuel Boost PumpSDR 2026FA0000623Cylinder · scoredTHIS IS A NEW AIRCRAFT. LESS THAN 50HRS HAD BEEN FLOWN BEFORE WE FOUND ISSUES. LOGBOOK ENTRY, AIRCRAFT HAD A HARD STARTING CONDITION. FOUND STUCK INTAKE VALVES ON CYLINDERS 2, 4 & 5 WHILE DOING A COLD COMPRESSION CHECK. UPON FURTHER INSPECTION ALL THE EXHAUSTDec 5, 2025 · N306VA · Robsin R44 · Reciprocating Engine Cylinder SectionSDR 2024FA0000479Boot · crackedC156-2 WINTER BOOTS (FEATHER BEARINGS ON THE BLADES) DEVELOPED FRACTURES IN THE SILICONE WHERE STRESSES FROM STRETCHING AND DEFORMATION WAS CONCENTRATED. IT WAS NOT A CUT, AND APPEARED TO BE GRANULAR OR ALMOST LIKE FLOWLINES FROM MOLDING.Mar 1, 2024 · N446TC · Robsin R44RAVENII · Propeller/Rotor Anti-Ice/De-Ice SystemSDR YV3R2023111500586Warning Unit · defectiveCUSTOMER REPORTED WARNING UNIT, LOW RPM P/N: A569-9 PART FAILURE, HORN LIGHT STAYS ON.Oct 19, 2023 · Robsin R44RAVENII · Main Rotor Indicating SystemSDR 2023FA0000601Muffler · distortedEXHAUST SYSTEM HEAT DEFORMING. NEW MUFFLER SYSTEM INSTALLED @ 449.94 THEN AGAIN @912.12.Oct 17, 2023 · N654SA · Robsin R44RAVENII · Engine Noise SuppressorSDR YV3R2023100200582Controller · intermittentCUSTOMER REPORTED CONTROLLER ASSEMBLY (GOVERNOR) P/N: D278-2 WAS INTERMITTENT.Sep 7, 2023 · Robsin R44RAVENII · Engine Indicating SystemSDR YV3R2023100200580Shield · crackedCUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 WAS FOUND CRACKED.Aug 29, 2023 · Robsin R44RAVENII · Engine Noise SuppressorSDR YV3R2023082800578Shield · crackedCUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-1 WAS FOUND CRACKED..Aug 25, 2023 · Robsin R44RAVENII · Engine Exhaust SystemSDR YV3R2023092900579Actuator · defectiveCUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 ONLY HAD ONE TENSION PLATE WORKING.Aug 25, 2023 · Robsin R44RAVENII · Main Rotor Drive SystemSDR 2023FA0000345Intake Valve · separatedPILOT REPORTED THAT DURING CRUISE FLIGHT ENGINE RPM BEGAN TO FLUCTUATE AND ENGINE BEGAN TO RUN ROUGH. PILOT IMMEDIATELY RETURNED TO BASE AND MADE A NORMAL LANDING. WHEN ON THE GROUND THE PILOT REPORTED THAT THE ENGINE WAS RUNNING ROUGH AND A SIGNIFICANT VIBRATJun 27, 2023 · N220SG · Robsin R44RAVENII · Reciprocating Engine Cylinder SectionSDR YV3R2023071000576Altimeter · defectiveCUSTOMER REPORTED ALTIMETER P/N: A613-2 WAS STICKING AND SLUGGISH IN OPERATION.Jun 23, 2023 · Robsin R44RAVENII · Altimeter, Barometric/EncoderSDR 2023FA0000278Exhaust Valve · corrodedDURING BORE SCOPE INSPECTION OF CYLINDER ASSEMBLIES THE NUMBER 3 CYLINDER EXHAUST VALVE WAS FOUND TO BEY HEAVILY PITTED ON VALVE BELL. THE ENGINE HAS ACCUMULATED 398.4 HOURS SINCE MAJOR OVERHAUL. NEW CYLINDER ASSEMBLIES INCLUDING VALVES WERE INSTALLED AT OVERHMay 23, 2023 · N3206M · Robsin R44RAVENII · Reciprocating Engine Cylinder SectionSDR YV3R2023051600567Relay · inoperativeCUSTOMER REPORTED RELAY ASSEMBLY P/N: B280-12 WAS INOPERATIVE (NO LOW RPM LIGHT OR HORN).May 10, 2023 · N944VB · Robsin R44RAVENII · Main Rotor Indicating SystemSDR YV3R2023051600568Shield · crackedCUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 WAS FOUND CRACKED.May 10, 2023 · Robsin R44RAVENII · Engine Exhaust SystemSDR 2024FA0000205Clutch Actuator · brokenAFTER PIC LANDED N31471 WITH THE COLLECTIVE FULL DOWN, THE CLUTCH LIGHT ILLUMINATED. AFTER LIGHT HAD BEEN ON FOR 10 SECONDS, PIC PULLED THE CLUTCH CIRCUIT BREAKER IN ACCORDANCE WITH THE R44 POH AND ROLLED DOWN THE THROTTLE. PIC THEN SHUT DOWN THE HELICOPTER IAApr 21, 2023 · N31471 · Robsin R44RAVENII · Engine/Transmission CouplingSDR YV3R2023042700563Controller · defectiveCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 OVER SPEEDS ENGINE AND ROTOR SYSTEM.Apr 20, 2023 · N276RC · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2023042700561Relay · faultyCUSTOMER REPORTED RELAY, 40 AMP 24V, SPDT P/N: D260-4 SHORTED INTERNALLY.Apr 18, 2023 · N8611C · Robsin R44RAVENII · Electrical Power SystemSDR YV3R2023042700562Cylinder · defectiveCUSTOMER REPORTED CYLINDER ASSEMBLY P/N: D679-3 LEAKED BELOW ALLOWABLE INDICATION LIMIT.Apr 18, 2023 · Robsin R44RAVENII · Emergency Flotation SectionSDR YV3R2023031500554Shield · crackedCUSTOMER REPORTED SHIELD P/N: D785-4 CRACKED IN HALF.Feb 28, 2023 · N744HJ · Robsin R44RAVENII · Air Conditioning SystemSDR YV3R2023031500552Actuator · defectiveCUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 FAILED SWITCH TEST.Feb 16, 2023 · Robsin R44RAVENII · Main Rotor Drive SystemSDR YV3R2023031500553Shield · crackedCUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 CRACKED.Feb 16, 2023 · Robsin R44RAVENII · Engine Exhaust SystemSDR YV3R2023031400551Controller · defectiveCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 GIVING A HIGH READING OF MORE THAN 101% RPM.Jan 4, 2023 · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2023031400549Controller · malfunctionedCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 MALFUNCTIONED.Dec 15, 2022 · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2022111700548Controller · defectiveCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 GIVES HIGH READINGS ON DUAL TACHOMETER.Nov 1, 2022 · Robsin R44RAVENII · Engine Indicating SystemSDR YV3R2022111700547Dual Tachometer · defectiveCUSTOMER REPORTED DUAL TACHOMETER ASSEMBLY P/N: C792-5 FLUCTUATES CAUSING OVER RPM.Oct 31, 2022 · Robsin R44RAVENII · Main Rotor Indicating SystemSDR 2022FA0000591None · collapsedTHE AIRCRAFT LANDED UNEVENTFULLY AND WAS SHUT DOWN BY THE PILOT. AFTER SHUTDOWN THE PILOT INSTALLED THE GROUND HANDLING WHEELS AND BEGAN TO MOVE THE AIRCRAFT INTO THE HANGAR. WHILE GROUND HANDLING THE AIRCRAFT THE AFT RIGHT HAND LANDING GEAR STRUT BROKE AND COOct 4, 2022 · N911TM · Robsin R44RAVENII · Landing Gear SystemSDR YV3R2022100700544None · failedCUSTOMER REPORTED WARNING UNIT ASSEMBLY (LOW RPM) P/N: A569-9 FAILED TO ACTIVATE LIGHT AND HORN.Sep 15, 2022 · Robsin R44RAVENII · Main Rotor Indicating SystemSDR YV3R2022091400537Coordinator · defectiveTURN COORDINATOR ASSEMBLY P/N: B329-1 WAS INOPERATIVE.Aug 24, 2022 · Robsin R44RAVENII · Navigation SystemSDR YV3R2022091300535Governor · defectiveCUSTOMER REPORTED GOVERNOR ASSEMBLY P/N: B247-5 WAS UNSERVICEABLE (INTERMITTENT). TESTING RESULTS: INTERMITTENT IN WIRES APPROXIMATELY 0.5" FROM GROMMET.Aug 8, 2022 · Robsin R44RAVENII · Standard Practices/StructuresSDR 2022FA0000525Exhaust Valve · brokenDURING CRUISE FLIGHT ENGINE BEGAN TO RUN ROUGH AND MANIFOLD PRESSURE INCREASED. PILOT WAS ABLE TO RETURN TO THE HELIPAD AND MAKE A NORMAL LANDING. EXHAUST VALVE STEM WAS FOUND TO BE BROKEN AT THE BELL CURVE AND THE VALVE WAS IN THE CYLINDER BORE. SEVERE CYLINDJul 21, 2022 · N144DM · Robsin R44RAVENII · Fuselage Structure (General)SDR 2022FA0000352Exhaust Valve · brokenNUMBER ONE CYLINDER EXHAUST VALVE STEM BROKE RELEASING VALVE INTO CYLINDER.Jul 13, 2022 · N118YL · Robsin R44RAVENII · Powerplant SystemSDR YV3R2022071100533None · defectiveCUSTOMER REPORTED EVAPORATOR ASSEMBLY P/N: D798-1 CAUSES COMPRESSOR TO SHORT CYCLE, AND DOES NOT COOL.Jul 7, 2022 · N868MP · Robsin R44RAVENII · Air Conditioning SystemSDR 2022FA0000440Exhaust Valve · brokenEXHAUST VALVE BROKE AT STEM AND ENGINE SUFFERED PARTIAL LOSS OF POWER.Jun 25, 2022 · N3055Y · Robsin R44RAVENII · Engine (Reciprocating)SDR YV3R2022071100532None · defectiveCUSTOMER REPORTED GOVERNOR CONTROLLER ASSEMBLY P/N: D278-2 RUNS TO 106%.Jun 16, 2022 · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2022052600530None · defectiveCUSTOMER REPORTED TAIL ROTOR GEARBOX ASSEMBLY P/N: C021-1 LEAKED FROM THE INPUT CARTRIDGE SEAL.May 17, 2022 · Robsin R44RAVENII · Tail Rotor GearboxSDR YV3R2022050400526None · defectiveCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 WAS UNSERVICEABLE.Apr 21, 2022 · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2022050400525None · defectiveCUSTOMER REPORTED DUAL TACHOMETER ASSEMBLY P/N: C792-4 NEEDLES WERE JUMPING WITHIN UNIT.Apr 9, 2022 · N2444 · Robsin R44RAVENII · Main Rotor Indicating SystemSDR 2022FA0000524Exhaust Valve · brokenDURING CRUISE FLIGHT PILOT REPORTED ENGINE BEGAN TO RUN ROUGH AND MANIFOLD PRESSURE INCREASED. HELICOPTER RETURNED TO HELIPAD AND MADE A NORMAL LANDING. EXHAUST VALVE STEM BROKE AT BELL CURVE AND WAS RELEASED INTO CYLINDER.Apr 8, 2022 · N911TM · Robsin R44RAVENII · Fuselage Structure (General)SDR YV3R2022030400521None · noneCUSTOMER REPORTED COVER ASSEMBLY (COOLING PANEL) P/N: D382-4 WAS CRACKED.Feb 28, 2022 · Robsin R44RAVENII · Engine Cooling SystemSDR YV3R2022030400520None · noneCUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 COLUMN SPRINGS DID NOT ACTUATE SIMULTANEOUSLY.Feb 16, 2022 · Robsin R44RAVENII · Main Rotor Drive SystemSDR YV3R2022031000522None · defectiveCUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 WAS INOPERATIVE.Feb 16, 2022 · Robsin R44RAVENII · Main Rotor Drive SystemSDR YV3R2022050400524None · defectiveCUSTOMER REPORTED WARNING UNIT ASSEMBLY P/N: A569-9 FAILED TO REACT TO RPM'S.Feb 14, 2022 · Robsin R44RAVENII · Main Rotor Indicating SystemSDR YV3R2022011000507None · noneCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 OCCASIONALLY ROLLED OFF WHEN COLD.Dec 14, 2021 · N329JK · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2022011000505None · noneDURING MAINTENANCE GROUND RUN, GOVERNOR CONTROLLER P/N: D278-2 INDICATED HIGH RPM WITH INDICATOR NEEDLE ON THE RED ARC.Nov 30, 2021 · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2021112000503None · noneCUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 COLUMN SPRINGS FAILED TO ACTUATE MICRO SWITCH.Nov 10, 2021 · Robsin R44RAVENII · Main Rotor Drive SystemSDR YV3R2021110900499None · noneCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2, ENGINE INDICATION HIGH AND UNABLE TO ADJUST.Oct 1, 2021 · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2021100700496None · defectiveCUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 WILL NOT MAINTAIN RPM.Sep 22, 2021 · Robsin R44RAVENII · Engine RPM Indicating SystemSDR YV3R2021072200471Warning Unit · defectiveCUSTOMER REPORTED WARNING UNIT P/N: A569-9 HORN (AUDIO) DID NOT SOUND.Jul 12, 2021 · N882GD · Robsin R44RAVENII · Main Rotor Indicating SystemSDR YV3R2021072200470Strut · leakingCUSTOMER REPORTED CYLINDER ASSEMBLY P/N: D679-3 WAS LEAKING. UPON TROUBLESHOOTING, GAUGE P/N: D769-1 WAS FOUND LEAKING.Jul 8, 2021 · Robsin R44RAVENII · Main Landing Gear Strut/Axle/TruckSDR YV3R2021070700469Dual Tachometer · defectiveCUSTOMER REPORTED DUAL TACHOMETER P/N: C792-4 ROTOR NEEDLE READS LOW 2-5%.Jun 30, 2021 · N144KD · Robsin R44RAVENII · Main Rotor Indicating System
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