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 98ZZZX3362Bolt · looseBLEED VALVE WAS SET UP ON TEST BENCH AND A RE-ALIGNMENT OF 90 DEGREE ELBOW WAS NEEDED TO INSTALL TEST ORIFICE AND JUMPER TUBE AND NOTICED THAT UPON SLIGHT TENSION, BOLT WHICH WAS SAFTIED, MOVED. THESE BOLTS HAVE A 30 TO 35 INCH/POUND TORQUE ATTACHED AND UPON Jul 24, 1998 · N547AL · Bell 407 · Compressor Bleed ValveSDR 98ZZZX3096Nozzle · failedTURBINE AND FUEL NOZZLE SENT TO SHOP FOR ENGINE MAKING METAL. REMOVED FUEL NOZZLE FROM COMBUSTION SECTION AND FOUND HEAVY CARBON BUILD-UP ON BOTTOM OF SHROUD HOUSING AND ALSO CARBON BUILD-UP INSIDE COMBUSTION LINER. FUEL NOZZLE WAS SHIMMED AT .341 INCH. CARJul 13, 1998 · N437AL · Bell 407 · Fuel Injector NozzleSDR 98ZZZX3097Bearing · galledENGINE REMOVED FROM AIRCRAFT FOR CHIP LIGHT. UPON INSPECTION OF PARTS, FOUND EXCESSIVE GALLING ON T/M JOURNAL INNER RACE AND ROLLERS. EXCESSIVE GALLING ON T/M JOURNAL BEARIANG INNER RACE AND ROLLERS.Jul 13, 1998 · N437AL · Bell 407 · Turbine Engine Reduction GearSDR 98ZZZX3164Spur Gear · wornENGINE HAD CHIP LIGHT. INSPECTED PER CSL-A-6012. WORN AFT SPLINES. FAILED GO-NO-GO GAUGE MEASUREMENT .9295 INCH.Jul 8, 1998 · Turbine Engine Compressor SectionSDR 98ZZZX3165Bearing · galledENGINE HAD CHIP LIGHT. UPON INSPECTION OF BEARINGS, FOUND HEAVY GALLING ON NR 2 BEARING. HEAVY GALLING ON NR 2 BEARING BALL.Jul 8, 1998 · Turbine Engine Compressor SectionSDR 98ZZZX3360Seal · failedENGINE WAS REMOVED FOR MAKING METAL. REMOVED NR 5 BEARING AND FOUND METAL IN BEARING CAVITY. REMOVED NR 5 BEARING FOR INSPECTION AND FOUND METAL SLIVERS UNDER NR 5 BEARING NUT AND CAP LOCK WASHER.Jul 2, 1998 · N477AL · Bell 407 · Turbine SectionSDR 98ZZZX2582Bearing · galledUPON DISASSEMBLY AND INSPECTION OF PARTS, FOUND T/M JOURNAL BEARING WITH EXCESSIVE GALLING ON END OF ROLLERS AND DEEP BANDING DOWN MIDDLE OF ROLLERS. EXCESSIVE GALLING AND BANDING OF T/M JOURNAL BEARING GALLING ON ROLLERS WAS ONLY TO OUTER PART OF ROLLERS ANDJul 1, 1998 · N567AL · Bell 407 · Turbine Engine Reduction GearSDR HEEA0015035Fadec Horn · defectiveFADEC HORN WEAK AND INAUDIBLE WITH ENGINE RUNNING.Jun 26, 1998 · N408PH · Bell 407 · Fuel Controlling SystemSDR HEEA0014914Seal · leakingFUEL PUMP SEAL DRAIN LEAKING.Jun 22, 1998 · N447PH · Bell 407 · Engine Fuel PumpSDR HEEA0014915Seal · leakingFUEL PUMP SEAL DRAIN LEAKING.Jun 22, 1998 · N447PH · Bell 407 · Engine Fuel PumpSDR HEEA0014931Hmu · malfunctionedFUEL METERING VALVE RATE FAULT.Jun 22, 1998 · N402PH · Bell 407 · Fuel Controlling SystemSDR HEEA0014934Hmu · failedFADEC FAILURE.Jun 22, 1998 · N403PH · Bell 407 · Fuel Controlling SystemSDR HEEA0014935Controller · faultyDECELLERATION IN-FLIGHT.Jun 22, 1998 · N403PH · Bell 407 · Fuel Control/Turbine EnginesSDR 98ZZZX2531Pinion Gear · galledUPON DISASSEMBLY AND INSPECTION OF PARTS, FOUND EXCESSIVE GALLING ON PINION GEAR AND SPALLING ON T/M GEAR. PINION GEAR HAD EXCESSIVE GALLING ON GEAR TEETH. POSSIBLY DUE TO IMPROPER MESHING OF GEARS. SECONDARY DAMAGE. T/M GEAR PN 689367. SN NN144843, TT: Jun 8, 1998 · N477AL · Bell 407 · Turbine Engine Reduction GearSDR 98ZZZX2532Rotating Seal · making metalENGINE WAS REMOVED FOR MAKING METAL. REMOVED NR 5 BEARING AND FOUND METAL IN BEARING CAVITY. REMOVED NR 5 BEARING FOR INSPECTION AND FOUND METAL SLIVERS UNDER NR 5 BEARING NUT AND CAP LOCK WASHER.Jun 8, 1998 · N477AL · Bell 407 · Turbine SectionSDR 98ZZZX2533Bearing · galledENGINE WAS REMOVED FOR MAKING METAL. INSPECTED AND FOUND GALLING ON NR 5 BEARING AND METAL SLIVERS UNDER NR 5 BEARING NUT AND CUP WASHER. ALSO FOUND NR 5 BEARING INTERNAL OUTER RACE DETERIORATING.Jun 8, 1998 · N407AL · Bell 407 · Turbine SectionSDR 98ZZZX2534Pinion Gear · galledUPON DISASSEMBLY OF GEARBOX AND INSPECTION OF PARTS DUE TO METAL, FOUND PINION GEAR HAD EXCESSIVE GALLING ON GEAR TEETH. POSSIBLY DUE TO IMPROPER MESHING OF GEARS. SECONDARY DAMAGE: T/M GEAR P/N 6893673 S/N NN143321. TT: 15,65.3 HOURS. SPALLING ON GEAR TJun 8, 1998 · N427AL · Bell 407 · Turbine Engine Reduction GearSDR 98ZZZX2536Bearing · failedENGINE REMOVED FOR MAKING METAL. UPON INSPECTION BEARINGS FOUND BAD NR 5 BEARING. SOURCE OF METAL WAS CAUSED BY GEARBOX TORQUE METER AND PINION GEAR DETERIORATING.Jun 8, 1998 · N567AL · Bell 407 · Turbine SectionSDR CA980602095Ecu · failed(CAN) ON SHORT FINAL APPROACH, FADEC FAIL WARNING LIGHT AND POWER LOSS. PILOT FORCED TO COMPLETE LANDING UNDER LOW POWER AND LOW ROTOR RPM RESULTING IN A HARD LANDING. ATTEMPTS TO DOWNLOAD FADEC ECU DATA TO MAINTENANCE TERMINAL UNSUCCESSFUL WITH NO ECU IS AVMay 25, 1998 · Fuel Control/Turbine EnginesSDR HEEA0014130Fadec Horn · defectiveFADEC FAIL HORN SOUNDS WEAK.May 7, 1998 · N457PH · Bell 407 · Fuel Controlling SystemSDR HEEA0014047Filter Element · cloggedON DAILY INSPECTION FOUND OIL FILTER BYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE FILTER.Apr 29, 1998 · N407MM · Bell 407 · Turbine Engine Oil SystemSDR 98ZZZX2091Fadec · malfunctionedEIGHT PERCENT DROOP OCCURRED WHEN GOING FROM RIGHT PEDAL TO LEFT PEDAL IN-FLIGHT. REPLACED WITH ZERO TIME FADEC ASSY. (ECU) SUPPLIED BY CHANDLER EVANS. DEFECTIVE UNIT RETURNED TO MANUFACTURER.Apr 20, 1998 · N605AS · Doug 600N · Fuel Controlling SystemSDR CA970505012Engine · malfunctioned(CAN) WHILE IN A 4 FOOT HOVER AT 100 PERCENT ROTOR AND NP RPM IN AUTOMATIC MODE, THE ENGINE WENT INTO AN UNCOMMANDED OVERSPEED OF 118.58 PERCENT THEN SHUT DOWN. EMERGENCY LANDING CARRIED OUT SUCCESSFULLY.Apr 16, 1998 · Bell 407 · Engine (Turbine/Turboprop)SDR 98ZZZX2014Combustion Case · crackedHIGHER THAN NORMAL MGT INDICATION BY PILOT WAS REPORTED. INSPECTED AND PERFORMED TEST OF MEASURED GAS TEMPERATURE SYSTEM. NO ANOMALLY OBSERVED. UPON FURTHER INSPECTION FOUND SEAM WELDS AROUND FUEL NOZZLE BOSS CRACKED ALLOWING COOLING AIR TO ESCAPE.Mar 24, 1998 · N58236 · Bell 407 · Turbine Engine Combustion SectionSDR HEEA0012752Signal Cond · malfunctionFUEL LOW LIGHT ON WITH 600 POUNDS OF FUEL.Feb 2, 1998 · N141MA · Bell 407 · Fuel Flow IndicatingSDR HEEA0012446Hmu · failedFADEC DEGRADE AND RESTART FAULT LIGHT ON IN FLIGHT. REPLACEMENT S/N ALM0437.Jan 5, 1998 · N417PH · Bell 407 · Fuel Controlling SystemSDR HEEA0012177Filter Element · defectiveENGINE BYPASS INDICATION. REPLACED OIL FILTER.Dec 3, 1997 · N447PH · Bell 407 · Engine Oil Indicating SystemSDR HEEA0012197Engine · contaminatedPOSSIBLE SALTWATER INGESTION.Dec 3, 1997 · N467PH · Bell 407 · Engine (Turbine/Turboprop)SDR CA971219038Hose · chafed(CAN) HOSE WAS FOUND CHAFED NEAR ENGINE COWLING.Dec 3, 1997 · Bell 407 · Engine Oil Distribution (Airframe Furnished)SDR HEEA0012128Filter Element · trippedENGINE EXTERNAL OIL FILTER BYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE FILTER.Nov 28, 1997 · N407MM · Bell 407 · Turbine Engine Oil SystemSDR CA971210019Bracket · cracked(CAN) COMPLYING WITH AD CF-97-19, FORWARD BEARING STARTED TO MAKE NOISE. WHILE REPLACING BEARING, THE BRACKET WAS FOUND CRACKED. PART TC: 630.Nov 20, 1997 · Bell 407 · Tail Rotor Drive ShaftSDR HEEA0011977Housing Assy · mismanufacturedMISMANUFACTURED, SEAT FOR RELIEF VALVE NOT FINISHED. OIL PRESSURE SLOW TO COME UP AND LOW AT 100%. REMOVED FROM ENGINE S/N CPPS-TB0040 AT ENGINE TOTAL TIME 80:00. REPLACEMENT HOUSING AND BUILD UP PARTS WERE RECEIVED AGAINST OUR RO#8077 AND SO#S:600971 AND 0Nov 12, 1997 · N3911L · Bell 412 · Turbine Engine Oil SystemSDR HEEA0011590Filter · cloggedBYPASS BUTTON POPPED ON ENGINE OIL FILTER. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N407MM · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011591Filter · cloggedON DAILY INSPECTION, FOUND OIL FILTER BYPASS INDICATOR EXTENDED. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N407MM · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011592Filter · cloggedBYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N57416 · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011593Filter · cloggedBYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N57416 · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011594Filter · cloggedBYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N57416 · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011595Filter · cloggedRECEIVED ON AIRCRAFT WITH BYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N447PH · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011596Filter · cloggedFILTER CLOGGED - BYPASSED. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N141MA · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011597Filter · cloggedENGINE EXTERIOR OIL FILTER BYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE FILTER.Oct 21, 1997 · N437PH · Bell 407 · Turbine Engine Oil SystemSDR HEEA0011599Valve · brokenDRAIN VALVE BROKE IN COMBUSTION CASE DRAIN BOSS. REPLACED WITH SERVICEABLE DRAIN VALVE. SCRAPPED BROKEN DRAIN VALVE.Oct 21, 1997 · N437PH · Bell 407 · Turbine Engine Combustion SectionSDR HEEA0011571Engine · failedENGINE REPAIR DUE TO FADEC DEGRADE LIGHT. ENGINE WENT TO 111.1% AT 61.5% TORQUE.Oct 20, 1997 · N407MM · Bell 407 · Engine (Turbine/Turboprop)SDR GCHA0000014Adapter · wornPART IS DIMENSION OVER MAXIMUM. SPLINES WORN. SUSPECT IMPROPER TYPE/LACK OF LUBRICATION FROM FACTORY. REMOVED AND REPLACED ADAPTER AND SHAFTING, BEARINGS AND RETAINING WASHERS REPLACED. CYCLES: 215. (X)Oct 1, 1997 · N176PA · Bell 407 · Fuel Controlling SystemSDR GCHR0000012Fadec · water contamFADEC FAILURE LIGHT ILLUMINATED IN DEPARTURE TRANSITION. PILOT SWITCHED TO MANUAL MODE AND LANDED AIRCRAFT. AIRCRAFT BEGAN ENGINE OVERSPEED, SYSTEM BACK-UPS CUT IN AND SHUT DOWN ENGINE. SYSTEM TROUBLESHOOTING FAILED TO RETRIEVE FLASH CODES. ENTRY TO ECU BSep 26, 1997 · N176PA · Bell 407 · Fuel Controlling SystemSDR GCHA0000013Fadec · malfunctionDURING POST-INSPECTION TEST FLIGHT, AIRCRAFT EXPERIENCED A FADEC DEGRADE AND RESTART FAULT LIGHT. THIS OCCURRED WHILE IN HOVER PERFORMING A POWER CHECK. AIRCRAFT WAS LANDED AND PILOT ATTEMPTED TO ROLL THROTTLE TO IDLE. WHILE FADEC WAS STILL IN AUTOMODE, NR Aug 17, 1997 · N175PA · Bell 407 · Fuel Controlling SystemSDR HEEA0010525Transducer · malfunctionAT HIGH POWER SETTINGS, ENGINE HAS SLIGHT TORQUE OSCILLATION, FADEC DEGRADE LIGHT ILLUMINATED DURING ENGINE START ON S/N 1090-111 AND REMAINED ON.Jul 21, 1997 · N407PH · Bell 407 · Fuel Controlling SystemSDR CA970728014Bracket · cracked(CAN) CRACKS FOUND ON OIL COOLER BLOWER SUPPORT BRACKETS AT STA 192.0, WL 73.25. ALSO FOUND CRACKED ANGLE BRACKETS, FRAME AND BONDED OIL COOLER PANEL ASSY OIL COOLER TRANSITION BRACKET HAD SMALL CRACK.Jul 10, 1997 · Bell 407 · Rotorcraft Cooling Fan SystemSDR HEEA0010382Transducer · defectiveTRANSDUCER CAUSING FADEC DEGRADE INDICATION.Jul 3, 1997 · N141MA · Bell 407 · Fuel Controlling SystemSDR CA970728013Oil Tank · cracked(CAN) OIL FOUND ON DECK UNDER ENGINE OIL RESERVIOR. FOUND OIL TANK CRACKED ON TOP. ALSO FOUND BROKEN OIL TANK SUPPORTS AND OIL COOLER BLOWER SUPPORT BRACKETS. BROKEN ANGLE BRACKETS AT STA 192.0, WL 73.25. CAUSE OF CRACKS APPEARS TO BE EXCESSIVE VIBRATION Jun 27, 1997 · Bell 407 · Rotorcraft Cooling Fan SystemSDR HAIHEEA9802Compressor · fod nicksDURING ENGINE F.O.D. CHECK, FOUND SEVERAL NICKS ON COMPRESSOR WHEEL. POLISHED OUT NICKS ON 7 EACH COMPRESSOR BLADES AS PER ALLISON M&O 250-C47B, 72-30-00.May 7, 1997 · N437PH · Bell 407 · Turbine Engine Compressor Section
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