Allison 250-C47B

Service difficulty reports · 1,403

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 = '250C47B'
  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 EVCA20260915001Duct · collapsedELECTRICAL ODOR IN CABIN FOLLOWED BY AIR CONDITIONER FAILURE. THE HOSE IN BETWEEN THE EVAPORATOR AND AFT BLOWER COLLAPSED CAUSING THE AFT BLOWER CB TO POP.Sep 14, 2026 · N660AE · Bell 407 · Air Distribution SystemSDR QMLA2026091320064Bypass Valve · failedUPON LANDING NOTICED COPIOUS AMOUNTS OF SMOKE BILLOWING FROM THE EXHAUST. SHUTDOWN AND NOTED THAT THE ENGINE OIL SITE GLASS WAS EMPTY. REPLACED ENGINE TURBINE ASSEMBLY, COMPETED AAIP INSPECTIONS, RII CHECKLIST, OPERATIONAL CHECKS, AIRCRAFT RETURNED TO REVENUESep 13, 2026 · N293AM · Bell 407 · Engine (Turbine/Turboprop)SDR QMLA20260812Indicator · inoperativeRECEIVED AND INSTALLED REPLACEMENT MGT INDICATOR. APPLIED GROUND POWER AND THE UNIT PASSED THE LCD TEST. AFTER ENGINE START THE MGT INDICATED ZERO. AIRCRAFT WAS SHUTDOWN AND I PERFORMED AN MGT INDICATOR FUNCTIONAL CHECK WITH THE BARFIELD TURBINE TEMP TESTER. TAug 12, 2026 · N445SL · Bell 407 · Central WarningSDR 2026FA0000635Blower Motor · burned outSHORTLY AFTER DEPARTURE, TURNED ON THE BLOWER. AFTER A FEW MINUTES CREW REPORTED A BURNING RUBBER SMELL. I TURNED OFF THE BLOWER AND THE SMELL DISSIPATED. I TURNED ON THE AIR CONDITIONER TO SEE IF IT CAME BACK AND WE EXPERIENCED THE SAME SMELL. AFT BLOWER MOTOAug 8, 2026 · N409GA · Bell 407 · Air Distribution SystemSDR 2026FA0000617Blower Motor · burned outCREW SMELLED A BURNING OR SMOKY SMELL COMING FROM AC VENTS. TURNED OFF AC AND BLOWER MOTOR, PULLED CIRCUIT BREAKER FOR AC, OPENED VENTS AND WINDOWS. AIRCRAFT LANDED WITH NO OTHER FAULTS.Jul 31, 2026 · N407BU · Bell 407 · Air Distribution FanSDR QMLA2026072520049Dual Tachometer · degradedNEEDLES ON DUAL TACH NOT ALIGNED WHILE RUNNING. FADEC DEGRADED/RESTART FAULT LIGHT ILLUMINATED AFTER STARTUP. REMOVED AND REPLACED DEFECTIVE DUAL TACH GAUGE.Jul 23, 2026 · N404LL · Bell 407 · Engine RPM Indicating SystemSDR QMLA2026071720048Unknown · odorELECTRICAL ODOR NOTICED DURING FLIGHT BACK TO BASE. PERFORMED OPS CHECKS. UNABLE TO DUPLICATE SMELL. RTSJul 17, 2026 · N229AM · Bell 407 · Air Distribution SystemSDR QMLA2026071420046Elec Connector · pulledRESTART FAULT AND FADEC DEGRADED LIGHTS ILLUMINATED ON TAKE OFF. PULLED FAULT ADAPTOR ELEC CONNECTOR. CLEANED AND REINSTALLED. CLEARED CODE, OPS GROUND RUN GOOD. NO DEFECTS NOTED.Jul 13, 2026 · N404LL · Bell 407 · Engine Fuel System WiringSDR EVCA202607011Warning Light · false activationDEPARTED HOSPITAL, XSMN CHIP LIGHT ILLUMINATED APPROX 2 MIN AFTER DEPARTURE. ABORTED FLIGHT, CONDUCTED PRECAUTIONARY EMERGENCY LANDING AT AIRPORT. REMOVED AND INSPECTED UPPER AND LOWER TRANS AND FREE WHEELING CHIP DETECTORS, REMOVED AND CHECKED FILTER, AND FOUJul 1, 2026 · N728AE · Bell 407 · Main Rotor Drive SystemSDR EVCA20260714001Motor · faultedAIRCRAFT DEPARTED THE BASE FOR A SCENE FLIGHT IN NASHVILLE ARKANSAS. APPROXIMATELY 5 MINUTES AFTER DEPARTURE CREW DESCRIBED SMELLING ELECTRICAL WIRES BURNING ALONG WITH ALL AIR CONDITIONER BLOWERS STOPPING. UPON TROUBLESHOOTING THE SYSTEM IT WAS FOUND THAT THEJun 21, 2026 · N102AE · Bell 407 · Air Distribution FanSDR 2026F00115Engine · smokeTHIS IS TO REPORT A NEW EVENT FOLLOWING SDR NO. 2120-0663. THE REPAIRED ENGINE WAS TAKEN OUT OF SERVICE FOR THE ENGINE SMOKE WHEN ENGINE TRANSITIONS FROM FLY TO IDLE. TROUBLESHOOTING WAS CARRIED OUT PER THE ROLLS ROYCE MANUAL. NO DISCREPANCIES WERE NOTED. May 20, 2026 · N777ZA · Bell 407 · Engine (Turbine/Turboprop)SDR EVCA20260511001Blower Motor · unserviceableSMOKE SMELL, AND VISUAL SMOKE IN CABIN. INSPECTED AIRCRAFT DETERMINED SMOKE SMELL TO BE COMING FROM AFT AC BLOWER MOTOR. REFERENCE AIR COMM ICA 407EC-200M-2.May 8, 2026 · N39AE · Bell 407 · Air Distribution FanSDR 2026F00095Hmu · faultedPILOT GOT RESTART FAIL LIGHT ON CAUTION PANEL. TESTING UNIT REVEALED ERRATIC READINGS OF THE FUEL METERING VALVE POTENTIOMETER.Apr 30, 2026 · N670RL · Bell 407 · Fuel Control/Turbine EnginesSDR 2026F00096Metering Valve · faultedPILOT GOT RESTART FAULT ON CAUTION PANEL. CODES EXTRACTED WAS WFMVRTFLT INDICATING ISSUE WITH FUEL METERING VALVE POTENTIOMETER.Apr 19, 2026 · N660RL · Bell 407 · Fuel Controlling SystemSDR 2026FA0000229Brushes · wornFOUND ONE BRUSH ONLY OF FOUR, WORN TO METAL, CONTACTING ARMATURE. STARTER / GENERATOR, BELL P/N: 206-062-200-113, MFR P/N: 23081-018Mar 26, 2026 · N407WF · Bell 407 · Starter-GeneratorSDR QMLA2026032120022Wire Harness · faultedON SHORT FINAL THE FADEC CHANNEL FAIL CAUTION LIGHT ILLUMINATED; IT WAS FOLLOWED BY THE CHECK INSTRUMENT WARNING LIGHT A SECOND LATER, THEN FINALLY THE FADEC MAINTENANCE LIGHT CAME ON FOLLOWED BY A MARRIED LOSS OF MY NR AND NP NEEDLES. MUCH LIKE A BIT TEST THEMar 20, 2026 · N773AL · Bell 407 · Engine Fuel System WiringSDR QMLA2026031920020Solenoid Valve · failedHYDRAULIC SYSTEM FAIL CAS ILLUMINATED ON TOUCHDOWN.Mar 19, 2026 · N292AM · Bell 407 · Hydraulic System, MainSDR QMLA2026011120002Unknown · odorMED CREW REPORTS A FUEL ODOR WHILE IN FLIGHT. PERFORMED VISUAL INSPECTION OF ALL VIABLE FUEL LINES, FUEL SUMPS, FUEL NOZZLE, AND FUEL FILTERS, IAW AMM DMC 407-A-24-00-00-130A-A. NO LEAKS NOTED AT THIS TIME.Jan 11, 2026 · N772AL · Bell 407 · Air Distribution SystemSDR QMLA2025112820118Engine · making metalAIRCRAFT WAS APPROACHING STELLAR AIRPORT IN RENO, NV FOR FUEL WHEN THE ENGINE CHIP LIGHT CAME ON. PILOT LANDED AT THE AIRPORT AND CALLED MECHANICS. MECHANICS PULLED CHIP DETECTORS AND FOUND BOTH TO BE HEAVILY CONTAMINATED INCLUDING OIL SAMPLE.Nov 28, 2025 · N223AM · Bell 407 · Engine (Turbine/Turboprop)SDR QMLA2025102320108Oil Filter · failedON CLIMB OUT, ENGINE OIL FILTER CAUTION LIGHT ILLUMINATED. PROCEDURE IS LAND AS SOON AS PRACTICAL. I WAS OVER A NUMBER OF BUILDING AND ALREADY HEADED FOR THE AIRPORT AND CONTINUED TO LAND ON THE RAMP. INSPECTION AFTER SHUTDOWN SHOWED APPROPRIATE ENGINE OIL LEVOct 22, 2025 · N88YJ · Bell 407 · Turbine Engine Oil SystemSDR QMLA2025102120106Potentiometer · unserviceableA FADEC DEGRADE CAUTION LIGHT ILLUMINATED IN-FLT ENROUTE BACK TO HOMEBASE. AFTER NOTIFYING THE CREW OF THE EMERGENCY EVENT THAT OCCURRED, EXECUTED EMERGENCY PROCEDURE IAW BH407HP RFM, WHICH WAS TO ENSURE ACFT STABILIZED & MINIMIZING CONTROL INPUTS, FADEC RESOct 20, 2025 · N775AL · Bell 407 · Central WarningSDR QMLA2025101420104Engine · overspeedENGINE OVERSPEED DURING FLIGHT.Oct 14, 2025 · N911CN · Bell 407 · Engine (Turbine/Turboprop)SDR QMLA2025101120101Engine · making metalENGINE CHIP LIGHT ILLUMINATED IN FLIGHT. UPON INSPECTION, ENGINE WAS FOUND TO BE MAKING METAL. AIRCRAFT CURRENTLY OOS,Oct 8, 2025 · N189AM · Bell 407 · Engine (Turbine/Turboprop)SDR 2026FA0000095Filter · mismanufacturedPERFORMING TRANSMISSION OIL AND FILTER CHANGE, MECHANIC NOTED THAT NEW OIL FILTER WOULD NOT INSTALL ON THE FILTER BOSS. WENT THROUGH INVENTORY AND FOUND THAT A TOTAL OF 10 FILTERS FROM OUR STOCK WOULD NOT FIT ON THE FILTER BOSS.Aug 7, 2025 · N723SF · Bell 407 · Oil ServicingSDR 2026F00041Engine · damagedUNKNOWN INTERNAL ENGINE COMPONENT CAUSING BURNING OF OIL AFTER ENGINE OVERHAUL AND REPLACEMENT OF ALL 4 TURBINE WHEELS.  FIRST OCCURRENCE RECORDED AFTER SMOKE WAS OBSERVED COMING FROM THE EXHAUST WHEN THE AIRCRAFT WAS AT IDLE AND DURING SHUTDOWN AFTER A FLIGHTJul 23, 2025 · N777ZA · Bell 407 · Engine (Turbine/Turboprop)SDR EVCA20250530001Blade · damagedCRACK FOUND 3/8" FROM THE AFT BLADE BOLE AREA IN NON-REPAIRABLE AREA OF MAIN ROTOR BLADE.May 28, 2025 · N190AE · Bell 407 · Main Rotor BladesSDR QMLA202504282005Seal · leakingCREW REPORTED A HAZE IN THE PASSENGER COMPARTMENT WHEN DEFROSTER SYSTEM WAS IN USE, DURING PREFLIGHT OIL WAS FOUND STREAKING OUT OF BLEED VALVE OUTLET/ EXHAUST ON TOP OF THE ENGINE COWLING.Apr 27, 2025 · N184AM · Bell 407 · Compressor Bleed ValveSDR QMLA2025040920048Oil System · leakingEXCESS OIL OBSERVED DRIPPING FROM AFT-MOST BOTTOM DRAIN TUBE.Apr 9, 2025 · N927AM · Bell 407 · Turbine Engine Oil SystemSDR QMLA2025032720041Rotor Head · crackedCRACK FOUND ON MAIN ROTOR HUB BEARING ADAPTER ASSY ON DIAMOND BLADE. REPLACED MRH ASSY.Mar 27, 2025 · N184AM · Bell 407 · Main Rotor HeadSDR EVCA033025Fuel · odorSMELLING FUEL ON TAKEOFF.Mar 27, 2025 · N481AE · Bell 407 · Air Distribution SystemSDR EVCA2025013000002Engine · fodSMOKE FROM HEATING SYSTEM WHEN HEAT IS ON. SMOKE CLEARS WHEN TURNED OFF. UPON INSPECTION OF ENGINE FOR SMOKE, FOUND ENGINE HAS FOD DAMAGE.Jan 30, 2025 · N906GF · Bell 407 · Engine (Turbine/Turboprop)SDR 2VKA2025020553456Washer · crackedWHILE CHANGING THE TRANSMISSION THE TECHNICIAN DISCOVERED ONE WASHER PN:140-007-25S22E6 CRACKED.Jan 28, 2025 · N561SF · Bell 407 · Fuselage Main, StructureSDR EVCA2025011500001Bearing · cokedEXCESSIVE SMOKE COMING FROM ENGINE AT IDLE. FOUND HEAVY COKING ON THE OIL STRUT AND POOR DRAIN BACK FROM 6/7 BEARINGS. ENGINE WAS INSTALLED 53.9 HRS PRIOR TO EVENT. ENGINE REQUESTED TO BE REMOVED AND RETURNED TO KEYSTONE FOR EVALUATION.Jan 14, 2025 · N512MT · Bell 407 · Engine (Turbine/Turboprop)SDR 8LFA202501154001Bearing Seal · leakingIN FLIGHT, SMOKE ACCUMULATED IN THE CABIN COMING FROM THE HEATING SYSTEM. PILOT TURNED OFF THE HEATING SYSTEM AND SMOKE DISSIPATED. UPON LANDING, IT WAS FOUND #1 BEARING WAS LEAKING AROUND THE SEAL RESULTING IN THE SMOKE IN THE BLEED AIR SYSTEM.Jan 14, 2025 · N448LF · Bell 407 · Engine (Turbine/Turboprop)SDR H44A202501070001Seal · failedPILOT REPORTED INCREASE IN ENGINE OIL PRESSURE AND DECREASE IN TRANSMISSION PRESSURE. UPON FURTHER INSPECTION IT WAS DISCOVERED THAT THE NEWLY INSTALLED PTO SEALS FAILED.Dec 17, 2024 · N401TD · Bell 407 · Turbine Engine Oil SystemSDR HDNA2024120200936Display · burned outPRIMARY FLIGHT DISPLAY HAD INTERNAL FAILURE RESULTING IN SMOKE COMING FROM SD CARD SLOTS. AIRCRAFT LANDED WITH NO OTHER FAULTS.Dec 2, 2024 · N407NA · Bell 407 · Central DisplaySDR QMLA2024112120145Oxygen Bottle · crackedAN OVERHAULED GASEOUS MEDICAL O2 BOTTLE WAS FOUND WITH MANUFACTURING DEFECT OR CRACK AT NECK/REGULATOR FITTING. FOUND DURING LEAK CHECK AFTER INSTALLATION.Nov 21, 2024 · N135AM · Bell 407 · Portable Oxygen SystemSDR QMLA2024102820139Engine · making metalENGINE CHIP LIGHT IN-FLIGHT I ACCEPTED A PATIENT FLIGHT REQUEST FOR AN INTERFACILITY TRANSFER FROM PINE RIDGE HOSPITAL TO MONUMENT HEALTH IN RAPID CITY, SD. FLIGHT WAS UNEVENTFUL ENROUTE TO THE HOSPITAL AND THE PATIENT LEG. THE PATIENT WAS DROPPED OFF AND WE Oct 25, 2024 · N450AM · Bell 407 · Engine (Turbine/Turboprop)SDR QMLA2024102820140Unknown · fumesFUMES IN CABIN NOTED AND FLIGHT ABORTED RTB, ADJUSTED A/C DUCT ON AFT BLOWER MOTOR. OPS CHECKED GOOD. ALL MAINTENANCE COMPLETED.Oct 25, 2024 · N696AM · Bell 407 · Air Distribution SystemSDR QMLA2024102120136Pump · faultedPILOT REPORTED HYDRAULIC WHINE/GRIND ON LANDING 10/19/2024 @ 0930. MECHANIC PERFORMED INSPECTION OF HYDRAULIC SYSTEM, GROUND RUN, AND TEST FLIGHT, NO ABNORMAL NOISES OR OPERATION NOTED. LATER THAT EVENING PILOT REPORTED HUMMING/VIBRATION ON APPROACH, MECHANICSOct 21, 2024 · N911CN · Bell 407 · Hydraulic Pump (Electric/Engine), MainSDR QMLA2024101120131Unknown · odorSMELL OF ELECTRICAL BURNING IN FLIGHT AFT CABIN, NOTICED BY AIRCREW. INSPECTED AFT BAGGAGE COMPARTMENT, UPPER AVIONICS BAY INCLUDING WIRING AND RELAYS. GROUND RUNS AND OPS CHECK GOOD, NO DEFECTS NOTED. THIS AIRCRAFT HAS BEEN RETURNED TO REVENUE SERVICE. REF# MOct 10, 2024 · N408SH · Bell 407 · Air Distribution SystemSDR ZD4R202410040001Shaft · brokenDISASSEMBLED GEARBOX AND FOUND 2 BROKEN TEETH ON TORQUEMETER GEARSHAFT. GEAR TEETH WERE LOCATED AT BOTTOM OF GEARBOX. MINOR METAL DEBRIS FOUND ON MAGNETIC CHIP DETECTORS. MINOR DAMAGE TO GEARBOX COVER AND HOUSING ASSEMBLY.Oct 4, 2024 · N36VA · Bell 407 · Accessory GearboxesSDR QMLA2024100120126Oil System · overtempENTERING CRUISE FLIGHT AFTER TAKEOFF, EOT TURNED RED AND INDICATED 109C. INITIATED RETURN FOR LANDING. EOT SHOWED 135C ON LANDING, BUT LOWERED DURING 2 MINUTE SHUTDOWN. REMOVED AND REPLACED THE ENGINE.Sep 27, 2024 · N214AM · Bell 407 · Engine Oil TemperatureSDR QMLA2024092020121Sealant · damagedFUEL SMELL IN CABIN BY MED CREW, INSPECTED FOR FUEL LEAKS, NONE FOUND. REAPPLIED SEALANT TO PREVENT FUEL VENT FROM ENTERING CABIN. THIS AIRCRAFT HAS BEEN RETURNED TO REVENUE SERVICE.Sep 20, 2024 · N193AM · Bell 407 · Standard Practices/StructuresSDR QMLA2024091820117Unknown · odorDURING FLIGHT, I HEARD A POPPING SOUND AND SAW A FLASH ON THE LOWER PORTION OF THE CENTER CONSOLE FOLLOWED BY AN ELECTRICAL BURN SMELL. I IMMEDIATELY CHANGED MY COURSE TO A SAFE LANDING LOCATION. ONCE THE LANDING PHASE WAS SET I CHECKED ALL MY INSTRUMENTS AND Sep 17, 2024 · N772AL · Bell 407 · Air Distribution SystemSDR HDNA20240916001Unknown · odorUPON INITIAL DEPARTURE FROM BASE PIC REPORTED THAT THE MEDICAL CREW NOTED STRONG SMELL OF FUEL IN THE CABIN. FLIGHT WAS ABORTED AND RETURNED TO BASE. RESPONDING TECHNICIAN PERFORMED A DETAILED OF THE FUEL CAP, FUEL PLATES, FUEL SYSTEM, AND ENGINE COMPARTMENTS.Sep 13, 2024 · N922TG · Bell 407 · Air Distribution SystemSDR EVCA202408250001Drain · cloggedCREW NOTICED FUEL SMELL IN THE BACK OF THE AIRCRAFT DURING FLIGHT. FINDINGS: NO VISIBLE FUEL LEAKS FOUND IN CABIN, FUEL RESIDUE FOUND IN AFT FUSELAGE BOAT TAIL. SMALL DRAIN FOR THAT AREA WAS CLOGGED CLEARED OBSTRUCTION AND CLEANED AREA NO OTHER LEAKS NOTED.Aug 25, 2024 · N485AE · Bell 407 · Fuselage Main, StructureSDR QMLA2024081920102Blower Motor · failedCREW SMELLED BURNING ELECTRICAL OR BURNING RUBBER COMING OUT OF THE AIR CONDITION VENTS IN THE AFT PASSENGER COMPARTMENT. BURNING SMELL DISSIPATED WHEN AIR CONDITIONING TURNED OFF. BURNING SMELL POSSIBLY COMING FROM THE AFT BLOWER MOTOR. BURNING SMELL IN CP. AAug 17, 2024 · N338AM · Bell 407 · Air Distribution FanSDR QMLA2024081920103Blower Motor · failedBURNING SMELL IN AFT CABIN WITH AIR CONDITIONING ON.Aug 17, 2024 · N189AM · Bell 407 · Air Distribution FanSDR QMLA2024081520099Unknown · fumesDURING CRUISE FLIGHT, NURSE SMELLED ELECTRICAL BURNING FUMES COMING FROM AIR CONDITIONER GASPER. RETURNED TO THE NEAREST SAFE LANDING AREA WHICH WAS BASE AND SHUTDOWN. MAINTENANCE WAS CONTACTED.Aug 13, 2024 · N292AM · Bell 407 · Air Distribution System
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