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 HEEA064915Scroll · damagedENGINE REMOVED DUE TO F.O.D., LOUD NOISE. SCROLL HAS INDICATIONS IN WELDS OF TURNING VANES.Nov 1, 1999 · N407JR · Bell 407 · Turbine Engine Compressor SectionSDR HEEA064916Vane · crackedSCROLL HAD CRACKED TURNING VANE.Nov 1, 1999 · N57416 · Bell 407 · Turbine Engine Compressor SectionSDR CA991028060Connector · failed(CAN) ITEM SENT FOR TRANSLATION. ONE TIME FAILURE IND NR 3 AND AND 8 RESTART SYSTEM. HUMIDITY WITHIN CONNECTOR SPECIFIED TO BE THE PROBLEM ASSOCIATED TO THE WRONG INDICATION ON THE CIT THAT CAUSED THE FIXED FAIL OF THE FADEC.Oct 22, 1999 · Bell 407 · Fuel Controlling SystemSDR CA991104013Scroll · cracked(CAN) BRAIDED REINFORCED AREA OF SCROLL FOUND CRACKED. REINFORCEMENT AREA OF SCROLL FOUND CRACKED. REINFORCEMENT AREA ALSO DELAMINATED. THESE ITEMS PRESENTLY BEING ACTIONED BY ALLISON.Oct 20, 1999 · Bell 407 · Turbine Engine Compressor SectionSDR HEEA064700Indicator · weakBYPASS VALVE INDICATOR BUTTON WEAK.Oct 8, 1999 · N467PH · Bell 407 · Turbine Engine Bypass SectionSDR HEEA064682Filter · contaminatedMETAL IN OIL.Oct 5, 1999 · N141MA · Bell 407 · Turbine Engine Oil SystemSDR CA991028072Disc Pack · cracked(CAN) NR 7 THOMAS COUPLING DISC WAS FOUND CRACKED (BOTH FRONT AND BACK SEGMENTS WERE BROKEN).Sep 17, 1999 · Bell 407 · Tail Rotor Drive ShaftSDR 99ZZZX4078Bearing · failedDURING STRAIGHT AND LEVEL FLIGHT AT 3,700 FEET, TWO SHARP VIBRATIONS, EACH LASTING TWO SECONDS, APPROXIMATELY ONE SECOND APART WERE FELT IN THE AIRFRAME. A PRECAUTIONARY LANDING AT NEAREST PLATFORM WAS ACCOMPLISHED. DURING POST-FLIGHT INSPECTION, NOTICED INDISep 12, 1999 · N467AL · Bell 407 · Tail Rotor Drive ShaftSDR HEEA064336Connector · damagedSEVERAL PINHOLES ON CONNECTOR ARE CHIPPED AND ELONGATED. REFERENCE: DMR NR 686305.Sep 7, 1999 · N141MA · Bell 407 · Fuel Controlling SystemSDR CA990907046Vane · cracked(CAN) THE LEADING EDGE OF THE COMPRESSOR SCROLL TURNING VANE EXHIBITS A CRACK 1 INCH PARALLEL TO AND .5 INCH FROM THE LEADING EDGE.Aug 23, 1999 · Turbine Engine Compressor SectionSDR CA990907047Vane · broken(CAN) THE LEADING EDGE OF THE COMPRESSOR TURNING VANE BROKE AWAY .1 INCH BY .5 INCH.Aug 23, 1999 · Turbine Engine Compressor SectionSDR CA991004022Cable · broken(CAN) CARGO HOOK EMERGENCY RELEASE CABLE BROKE. SUSPECT OUTER SHEATH BROKE FIRST AND THEN INNER CABLE BROKE. IT IS THOUGHT THAT CABLE WAS TOO SHORT. PART SENT TO MANUFACTURER FOR EVALUATION.Aug 14, 1999 · Bell 407 · Cargo CompartmentsSDR 99ZZZX4402Bearing · making metalENGINE CHIP LIGHT CAME ON. CHIP PLUGS INSPECTED AND FOUND EXCESSIVE METAL PARTICLES ON BOTH PLUGS. FERRY PERMIT WAS ISSUED BY FSDO FOR FLIGHT FROM MANCHESTER, IA TO CEDAR RAPIDS, IA. ENGINE WAS REMOVED AND SENT IN FOR REPAIR. CAUSE UNKNOWN.Aug 9, 1999 · N407LG · Bell 407 · Turbine Engine Compressor SectionSDR 99ZZZX4562Ecu · failedTHE ECU, SN JG7ALK0380 FAILED AND WENT INTO THE MANUAL MODE. ATTEMPTS WERE MADE TO DOWNLOAD INFORMATION FROM THE ECU WITH NO RESULTS. REMOVED THE DEFECTIVE ECU. INSTALLED SERVICEABLE ECU. GROUND RAN AIRCRAFT. ALL SYSTEMS FUNCTIONALLY CHECKED OK. GROUNDEDAug 5, 1999 · N973AA · Bell 407 · Fuel Control/Turbine EnginesSDR CA990818004Vain · separated(CAN) A PIECE OF COMPRESSOR SCROLL TURNING VANE SEPARATED FROM LEFT ENGINE, A CRACK WAS ALSO FOUND ON RIGHT HAND TURNING VANE. FAA MADE AWARE OF THE PROBLEM THROUGH ALLISON ROLLS ROYCE.Aug 5, 1999 · Turbine Engine Compressor SectionSDR CA990907004Vane · cracked(CAN) FAILED COMPRESSOR SCROLL TURNING VANES REPORTED PREVIOUSLY, THE CAUSE OF THIS INCIDENT WAS A FAILED SCROLL 70 HRS POST REPAIR.Aug 5, 1999 · Bell 407 · Turbine Engine Compressor SectionSDR HEEA062887Hmu · malfunctionedRESTART FAULT AND FADEC DEGRADE LIGHTS ILLUMINATED ON SHUTDOWN. REPLACED WITH SERVICEABLE PART.Jul 13, 1999 · N407MM · Bell 407 · Fuel Controlling SystemSDR HEEA062888Hmu · failedHMU FAILED DRIVE SHAFT BACKLASH CHECK. REPLACED WITH SERVICEABLE PART.Jul 13, 1999 · N467PH · Bell 407 · Fuel Controlling SystemSDR 99ZZZX3087Bleed Valve · loosePILOT REPORTED 40 DEGREE HIGHER TEMPERATURE THAN NORMAL CAUSING LOW POWER TREND READINGS AND CRUISE FLIGHT TEMP EXCEEDING GREEN ARC. INSPECTION REVEALED HOUSING LOOSE DUE TO MOUNTING BOLTS LOSING TORQUE.Jul 12, 1999 · N517R · Bell 407 · Compressor Bleed ValveSDR HEEA062834Sensor · failedN2 SENSOR CAUSING FADEC DEGRADE LIGHT. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N407MM · Bell 407 · Fuel Control/Turbine EnginesSDR HEEA062836Transducer · malfunctionedTRANSDUCER CAUSED FADEC DEGRADE LIGHT TO ILLUMINATE. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N720PH · Bell 407 · Fuel Controlling SystemSDR HEEA062837Filter · cloggedENGINE OIL FILTER BYPASS BUTTON POPPED AFTER RESETTING TWICE. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N724PH · Bell 407 · Turbine Engine Oil SystemSDR HEEA062838Filter · cloggedENGINE OIL FILTER BYPASS BUTTON POPPED. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N437PH · Bell 407 · Turbine Engine Oil SystemSDR HEEA062839Filter · cloggedENGINE OIL FILTER BYPASS INDICATOR EXTENDED. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N510PH · Bell 407 · Turbine Engine Oil SystemSDR HEEA062840Filter · cloggedENGINE OIL FILTER BYPASS INDICATOR EXTENDED. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N437PH · Bell 407 · Turbine Engine Oil SystemSDR HEEA062841Ignitor Box · failedDIFFICULT TO START ENGINE. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N612PH · Bell 407 · ExciterSDR HEEA062842Harness · failedHARNESS CAUSING FADEC DEGRADE AND RESTART FAULT LIGHTS. REPLACED WITH SERVICEABLE ASSY.Jul 12, 1999 · N407MM · Bell 407 · Fuel Controlling SystemSDR HEEA061767Harness · failedFADEC DEGRADE AND RESTART FAULT LIGHTS ON. REPLACED WITH SERVICEABLE HARNESS.Apr 8, 1999 · N407MM · Bell 407 · Fuel Controlling SystemSDR HEEA061768Harness · failedFADEC DEGRADE LIGHT ON AFTER SHUTDOWN. COMPUTER SHOWED TORQUE TRANSMITTER PROBLEM FOUND IN FADEC HARNESS. REPLACED WITH SERVICEABLE HARNESS.Apr 8, 1999 · N722PH · Bell 407 · Fuel Controlling SystemSDR HEEA061769Harness · failedAPPROXIMATELY 55 MINUTES INTO FLIGHT, FADEC HAD NPQ EXCEEDENCE. ECU AND HMU REPLACED 9-13-98. REPLACED WITH SERVICEABLE HARNESS.Apr 8, 1999 · N408PH · Bell 407 · Fuel Controlling SystemSDR HEEA061547Filter · malfunctionedBYPASS BUTTON POPPED.Mar 29, 1999 · N467PH · Bell 407 · Turbine Engine Oil SystemSDR 99ZZZX414Bolt · stretchedUPON DISASSEMBLY OF ENGINE FOR METAL, CHECKED BOLT TIGHTNESS BY MOVING COVER AND BODY ASSY. ACTUAL TORQUE ON BOLTS WAS ONLY 15 INCHES/POUNDS. THREE EACH BLEED VALVE COVER BOLTS WERE NOT TORQUED TO SPECS FROM FACTORY OR BOLTS ARE STRETCHING AFTER ASSEMBLY ANDDec 23, 1998 · N537AL · Bell 407 · Compressor Bleed ValveSDR 99ZZZX408Bearing · galledUPON INSPECTION OF BEARING (AFT) PTO GEAR FOUND WITH EXCESSIVE GALLING ON ONE BALL BEARING. SUBMITTER STATED POSSIBLE CAUSE FOR BEARING GALLING UNKNOWN.Dec 22, 1998 · N537AL · Bell 407 · Turbine Engine Reduction GearSDR 99ZZZX416Line · cloggedUPON DISASSEMBLY OF GEARBOX, FOUND EXCESSIVE AMOUNTS OF SPLIT LINE SEALANT ON SPLIT LINE. NOTE: BEFORE DISASSEMBLY, FOUND ALOT OF SEALANT ALONG SPLIT LINE, OUTSIDE OF GEARBOX. UPON INSPECTION OF GEARBOX PARTS, FOUND SCAVENGE OIL TRANSFER TUBE NR 23004230 BLDec 22, 1998 · N537AL · Bell 407 · Turbine Engine Reduction GearSDR 99ZZZX415Gear · galledENGINE WAS REMOVED FOR METAL CHIPS ON UPPER AND LOWER CHIP PLUGS. UPON INSPECTION OF GEARBOX PARTS, FOUND PINION GEAR GALLING AND TORQUE METER GEAR SPALLING. NOTE: METAL CONTAMINATION CAUSED DAMAGE TO OTHER PARTS IN GEARBOX. SUBMITTER SUGGESTED IMPROPER MEDec 18, 1998 · N537AL · Bell 407 · Turbine Engine Reduction GearSDR 99ZZZX411Journal · making metalUPON DISASSEMBLY OF GEARBOX, TORQUE METER SUPPORT JOURNAL WAS FOUND TO HAVE MAGNESIUM SLIVERS IN JOURNAL BORE. UPON FINDING MAGNESIUM SLIVERS IN TORQUE METER JOURNAL BORE, MEASURED JOURNAL AND FOUND IT TO BE OVER MFG SPECS 2.485 INCHES (MFG MAX LIMIT 2.480 INDec 11, 1998 · N537AL · Bell 407 · Turbine Engine Reduction GearSDR 99ZZZX487Gear · making metalENGINE WAS REMOVED FOR TIME CHANGE TURBINE AND COMPRESSOR. UPON INSPECTION OF CHIP PLUGS, FOUND METAL CHIPS. DISASSEMBLED AND FOUND TORQUE METER GEAR AND PINION GEAR GALLING CAUSING SOME METAL CONTAMINATION DAMAGE TO THE PARTS. IMPROPER MESHING BETWEEN TORQNov 30, 1998 · N467AL · Bell 407 · Turbine Engine Reduction GearSDR 99ZZZX689Exciter · inoperativeEXCITER INOPERATIVE. ENGINE FAILED TO START. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.Nov 21, 1998 · N404EM · Bell 222U · ExciterSDR 98ZZZX4742Gear · galledENGINE MADE CHIP LIGHT. UPON DISASSSEMBLY AND INSPECTION OF PARTS, FOUND EXCESSIVE GALLING ON PINION GEAR AND T/M GEAR. PINION GEAR HAS EXCESSIVE GALLING ON GEAR TEETH, POSSIBLY DUE TO IMPROPER MESHING OF T/M AND PINION GEARS. SECONDARY DAMAGE: T/M GEAR P/Nov 2, 1998 · N547AL · Bell 407 · Accessory GearboxesSDR HEEA0016127Valve · failedREPAIR DUE TO OIL TEMPERATURE EXCEEDED 120 DEGREES. CAUSE FOR OIL TEMP - OIL TEMP THERMAL VALVE P/N 724155, S/N 6056.Oct 6, 1998 · N141MA · Bell 407 · Engine Oil Temperature RegulatorSDR HEEA0016128Engine · making metalREPAIR DUE TO ENGINE OIL PRESSURE DROPPED TO ZERO AND METAL IN OIL. CAUSE FOR LOSS OF OIL PRESSURE - A CRACKED SLEEVE ON AIRCRAFT LINE P/N 407-062-532-01.Oct 6, 1998 · N417PH · Bell 407 · Engine (Turbine/Turboprop)SDR HEEA0015900Hmu · failedHMU WOULD NOT GO TO IDLE.Aug 28, 1998 · N408PH · Bell 407 · Fuel Controlling SystemSDR HEEA0015671Fadec Horn · weakFADEC FAIL HORN AUDIO EXTREMELY WEAK.Aug 19, 1998 · N467PH · Bell 407 · Fuel Controlling SystemSDR HEEA0015530Filter · cloggedFOUND OIL FILTER BYPASS INDICATIONS. SCRAPPED OIL FILTER.Aug 13, 1998 · N141MA · Bell 407 · Turbine Engine Oil SystemSDR HEEA0015531Filter · cloggedSCAVENGE OIL FITLER BYPASS INDICATION. SCRAPPED OIL FILTER.Aug 13, 1998 · N403PH · Bell 407 · Turbine Engine Oil SystemSDR HEEA0015532Filter · cloggedFOUND OIL FILTER BYPASS BUTTON POPPED ON DAILY INSPECTION. SCRAPPED OIL FILTER.Aug 13, 1998 · N407MM · Bell 407 · Turbine Engine Oil SystemSDR HEEA0015533Filter · cloggedFILTER BYPASSING. SCRAPPED OIL FILTER.Aug 13, 1998 · N407MM · Bell 407 · Turbine Engine Oil SystemSDR HEEA0015534Filter · cloggedOIL FILTER BYPASS INDICATED TWO TIMES. SCRAPPED OIL FILTER.Aug 13, 1998 · N467PH · Bell 407 · Turbine Engine Oil SystemSDR 98ZZZX3356Gear · galledENGINE REMOVED FOR EXCESSIVE METAL ON BOTH PLUGS. DISASSEMBLED AND FOUND T/M GEAR TO PINION GEAR GALLING CAUSING METAL CONTAMINATION. SUBMITTER STATES IMPROPER MESHING BETWEEN T/M GEAR AND PINION GEAR WAS CAUSE FOR GALLING. SECONDARY DAMAGE - PINION GEAR P/Aug 7, 1998 · N457AL · Bell 407 · Turbine Engine Reduction GearSDR 98ZZZX3359Bolts · losePRIOR TO INSTALLING BLEED VALVE ON TEST BENCH, AN INSPECTION OF ALL SAFETIES WAS ACCOMPLISHED AND FOUND 3 EACH BOLTS WERE SAFTIED BUT LOOSE. THESE BOLTS WERE IMPROPERLY TORQUED AND CAUSED A MAJOR AIR LEAK AT SPLIT LINES OF BLEED VALVE.Jul 24, 1998 · N567AL · Bell 407 · Compressor Bleed Valve
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