Allison 250-C20B
Service difficulty reports · 1,981
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 = '250C20B' 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.
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 = '250C20B' ORDER BY difficulty_date DESC
Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
SDR 2000ZZZX271Engine · malfunctionedAFTER ARRIVAL AT AIRPORT, GROUND RAN THE AIRCRAFT. NR 2 ENGINE COULD ONLY OBTAIN 68 PERCENT N2 SPEED WITH THROTTLE IN THE FLY POSITION. SHUT DOWN ENGINE, PERFORMED STATIC LEAK CHECK ON NR 2 ENGINE WITH NO LEAKS NOTED. SUBMITTER RECOMMENDED GOVERNOR CHANGE.SDR HEEA0016671Actuator · failedACTUATOR WILL NOT ACTUATE.SDR HEEA0016679Actuator · failedACTUATOR WILL NOT ACTUATE.SDR AU981538Ring · missing(AUS) HYDRAULIC PUMP ATTACHMENT COUPLING P/N 850509-1 SEPARATED FROM THE HYDRAULIC PUMP. INVESTIGATION FOUND THE PUMP DRIVE SPLINE RETAINING RING WAS MISSING.SDR AU981539Coupling · wrong part(AUS) ENGINE TO MAIN TRANSMISSION DRIVESHAFT AFT OUTER COUPLING TO FREEWHEEL ASSEMBLY FLANGE INCORRECTLY ASSEMBLED. TWO WASHERS WERE INSTALLED UNDER EACH OF THE FOUR ATTACHMENT BOLT HEADS. WASHERS SHOULD ONLY BE INSTALLED UNDER EACH NUT. THE BOLTS WERE NOT SDR AU981542Screw · wrong part(AUS) MAIN ROTOR HUB FLAP RESTRAINT ASSEMBLY SCREWS WERE THE INCORRECT PART NUMBER FOR THE INSTALLATION. CORRECT P/N M524694-555. MAST NUT FOUND BELOW MINIMUM TORQUE VALUE.SDR HEEA0016177Shaft · spalledENGINE REMOVED DUE TO METAL. UPON INSPECTION OF COMPRESSOR PARTS NOTED: SPALLING ON SHAFT GEAR TEETH. INSTALLED A NEW SHAFT.SDR HEEA0016178Bearing · spalledENGINE REMOVED DUE TO METAL. UPON INSPECTION OF GEARBOX PARTS NOTED: SPALLED ON NR 2 1/2 BEARING OUTER RACE AND ROLLERS. INSTALLE D A NEW BEARING.SDR CA981027007Shaft · wrong part(CAN) ON DISASSEMBLY AT OVERHAUL FACILITY, THE APC STARTER/GENERATOR WAS FOUND TO CONTAIN A LUCAS SHAFT AND A LUCAS DAMPENER IN PLACE OF THE APC SHAFT, P/N 150SG1103-2. THE ASSEMBLY ALSO HAD A SECOND DAMPENER DEVICE AT THE ANTI-DRIVE END. SUBMITTER STATED NSDR CA981125047Nut · missing(CAN) ON 200-HOUR INSPECTION, FOUND ONE OF THE TAIL ROTOR DRIVESHAFT HANGERS WITHOUT A NUT OR COTTER PIN.SDR CA981022004Clamp · cracked(CAN) IN THE HOVER, TAIL STROBE LIGHT CLAMP BROKE OFF AT THE ATTACHMENT TABS. POSSIBLE OVERTORQUE OF THE ATTACHMENT SCREW.SDR HEEA0016136Gearbox · making metalENGINE REMOVED DUE TO METAL. INSPECTION OF GEARBOX REVEALED: PULLED COMPRESSOR MOUNT INSERT AS MARKED AND BRONZE LIFTING ON GEARBOX FORWARD AND AFT PTO BORES.SDR HEEA0016137Cover · looseENGINE REMOVED DUE TO LOW POWER. UPON DISASSEMBLY OF ENGINE NOTED: DETACHED SPARE CAGE IN GEARBOX. GEARBOX DISASSEMBLY REVEALED: DETACHED SPARE CAGE AND LOOSE CAGES AS MARKED ON GEARBOX COVER. INSTALLED OVERHAULED COVER.SDR HEEA0016138Housing · looseENGINE REMOVED DUE TO LOW POWER. UPON DISASSEMBLY OF ENGINE NOTED: DETACHED SPARE CAGE IN GEARBOX. GEARBOX DISASSEMBLY REVEALED: LOOSE P.T.O. CAGE IN GEARBOX HOUSING. INSTALLED A OVERHAULED GEARBOX HOUSING.SDR HEEA0016130Nozzle · malfunctionedENGINE REMOVED DUE TO LOW POWER AND SMOKE ON DECELERATION. REPLACED NR 3 NOZZLE, POWER INCREASED 6 PERCENT. TRIED NR 3 NOZZLE ON ANOTHER TURBINE. LOW POWER ON TEST CELL. REPLACED NOZZLE AND HAD A 3 PERCENT INCREASE IN POWER. INSTALLED A STANDARD AERO OVESDR HEEA0016121Tube · mismanufacturedRECEIVING INSPECTION REVEALED: TUBE UNABLE TO FIT INTO SCROLL. PART OVERHAULED ON W/O NR L169384.SDR HEEA0016123Nozzle · mismanufacturedRECEIVING INSPECTION REVEALED: VOIDS IN NR 4 NOZZLE TIP PATHS. PART OVERHAULED ON WO NR L174496.SDR HEEA0016124Collector · mismanufacturedRECEIVING INSPECTION REVEALED: MEASURED .085 INCH OVER BP SPECS (.105 INCH - .110 INCH) ON EXHAUST COLLECTOR FLANGE. PART OVERHAULED ON W/O NR 15644.SDR CA981109047Cable · separated(CAN) INADVERTENT RELEASE OF LOAD. SWAGED END OF MANUAL RELEASE CABLE SEPARATED CAUSING THE HOOK TO UNLATCH.SDR AU981241Pin · broken(AUS) MAIN ROTOR BLADE RETAINING PIN BROKEN. PART TC: 4,180.SDR AU981537Fuel Cell · contaminated(AUS) FUEL CELL CONTAMINATED BY DEBRIS AND FUNGAL GROWTH. BOTH FUEL BOOST PUMPS ALSO COVERED WITH FUNGUS. PART TC: 1,246.SDR 99ZZZX1118Nozzle · crackedTHE FAA-PMA NOZZLE WAS REMOVED FROM AN ALLISION 250-C20B TURBINE THAT WAS RECEIVED FOR OVERHAUL. UPON FLUORESCENT PENETRANT INSPECTION, FOUND A SERIES OF CRACKS ON BOTH SIDES OF THE DIAPHRAGM IN THE RADIUS OF THE BEND AT ITS OUTER DIAMETER. THE CRACKS ON THESDR CA981125044Servo · failed(CAN) AFTER SERVO INSTALLATION, THE TEST FLIGHT REVEALED CONTROL FEEDBACK. SERVO REPLACED.SDR HEEA0016046Wheel · mismanufacturedRECEIVING INSPECTION REVEALED: MEASURED .010 INCH OVER SPECS (7.506 INCH - 7.508 INCH) ON NR 3 WHEEL OUTSIDE DIAMETER. INSTALLED A NEW NR 3 WHEEL.SDR CA980922005Cover · separated(CAN) IN CRUISE DURING A 40 MINUTE FLIGHT, PILOT FELT A THUMP IN PEDALS BUT NO BUZZ DEVELOPED. ON POST-FLIGHT INSPECTION, PILOT NOTICED BELLCRANK COVER MISSING AT STATION 142. THREE STUDS STILL IN PLACE. ONE TAIL ROTOR BLADE HAD A DENT BEYOND LIMITS.SDR HEEA0016031Fuel Control · out of adjustON FIRST START AFTER INSTALLATION IN THE AIRCRAFT, TOT ROSE RAPIDLY. FOUND START/ACCEL AND START/DERICH ADJUSTMENTS TURNED TO MINIMUM, NO MORE ADJUSTMENT AVAILABLE. RECEIVED UNIT IN SHOP WITH START DERICHMENT AND START ACCELERATION ADJUSTMENTS BOTH ADJUSTED SDR 98ZZZX3643Governor · lack of lubeGOV HAS BLUE GREASE WASHED OUT. SENT FOR REPAIR.SDR CA981019014Nozzle · failed(CAN) FUEL NOZZLE WAS SENT FOR CLEANING AND FLOW CHECK. THE FUEL NOZZLE WAS RETURNED SERVICEABLE. AFTER 66 HOURS OF SERVICE THE ENGINE BROKE DOWN AND THE CAUSE WAS ATTRIBUTED TO THE COMBUSTION LINER. THE FUEL NOZZLE WAS REINSTALLED AND AFTER 75 HOURS OF SERVSDR HEEA0015945Wheel · mismanufacturedENGINE REMOVED DUE TO COMPRESSOR OVERHAUL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: MEASURED .006 INCH OVER BLUE PRINT SPECS. (6.190 INCH - 6.191 INCH) ON NR 1 WHEEL OUTSIDE DIAMETER. INSTALLED A NEW SDR HEEA0015947Line · misalignedRECEIVING INSPECTION REVEALED: MISALIGNMENT OF TUBE ASSEMBLY. INSTALLED A NEW TUBE ASSY.SDR HEEA0015933Servomotor · failedSERVO MOTOR WILL NOT ACTUATE, FILTER SHORTED TO GROUND.SDR HEEA0015934Servomotor · failedSERVO MOTOR WILL NOT ACTUATE UP OR DOWN, BRAKE STICKING.SDR HEEA0015854Pump · malfunctionedBYPASS VALVE NOT SEALING CLOSED.SDR HEEA0015765Wheel · corrodedENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED: MINOR SULPHIDATION ON 12 BLADES. SCRAPPED NR 1 WHEEL.SDR AU981432Bearing · failed(AUS) MAIN ROTOR MAST UPPER BEARING FAULTY. INVESTIGATION FOUND ONE BALL TO HAVE SEVERE PITTING/BRINELLING WITH THE OUTER RACE SHOWING SIGNS OF FAILURE. PART TC: 1,224.SDR AU981078Turbine · cracked(AUS) SECOND STAGE TURBINE WHEEL CRACKED IN THREE PLACES. CRACK LENGTHS APPROXIMATELY 25.4 MM (1 INCH). PART TC: 1,621.SDR AU981399Skin · cracked(AUS) RIGHT FUSELAGE CRACKED FROM THE FORWARD FACE OF THE HEATER DUCT HOLE THROUGH THE INNER INSPECTION HOLE AND UP THE AFT FACE OF THE CLOSURE PANEL. CRACKING WAS HIDDEN BENEATH SOUND PROOFING.SDR HEEA0015324Servo Motor · inoperativeSERVOMOTOR INTERMITTENTLY INOPERATIVE.SDR 98ZZZX2955Engine · making metalENGINE CHIP LIGHT CAUTION LIGHT ILLUMINATED. PILOT MADE PRECAUTIONARY LANDING AT A FIELD SITE 3 MILES SOUTH OF AIRPORT. CHIP DETECTORS REMOVED AND INSPECTED IAW ALLISON OPERATION AND OVERHAUL MANUAL 10WZ PAG G-1. SMALL CHIPS AND FLAKES WERE NOTED (3), PLUGSSDR HEEA0015237Valve Sleeve · unbondedFOUND DEFECTIVE METERING VALVE SLEEVE (UNBONDED). REPLACED METERING VALVE SLEEVE. UNIT TESTED SATISFACTORY PER TEST CALIBRATION SPECS NR 12529-01.SDR HEEA0015240Servo Motor · malfunctionedNR STARTED TO DROOP AFTER TAKEOFF AND WOULD NOT BEEP UP.SDR HEEA0015269Servo Motor · failedACTUATOR WOULD NOT BEEP. FOUND WIRE WORN THROUGH AT BODY.SDR 98ZZZX3160Control Cable · brokenON LAST FLIGHT OF THE DAY, ROLLED THE GAS PRODUCER N1 CONTROL TO FLIGHT IDLE. UNABLE TO SHUT ENGINE OFF WITH THROTTLE CONTROL. ENGINE HAD TO BE SHUT DOWN MANUALLY. UPON INVESTIGATION, FOUND CABLE ASSY BROKEN UNDER PILOT'S SEAT DECK. FAILED PART, POSSIBLY BSDR CA990531005Bearing · misinstalled(CAN) DURING A 300 HOUR CLUTCH INSPECTION, AN INCORRECT P/N 369A5363 TYPE BEARING WAS FOUND TO BE INSTALLED IN THE -51 CLUTCH. THE BEARING WAS MARKED MRC R12. THE O/H MANUAL STATES THAT THE BEARINGS MARKED MRC R12 MUST NOT BE INSTALLED IN A -51 CLUTCH.SDR 98ZZZX3545Case Halves · damagedFAILURE OF THE STATOR CAUSED A COMPRESSOR FAILURE RESULTING IN LOSS OF POWER ON THE ENGINE. A SINGLE ENGINE LANDING WAS ACCOMPLISHED WITH NO FURTEHR INCIDENT.SDR HEEA0015155Wheel · mismanufacturedENGINE REMOVED DUE TO COMPRESSOR OVERHAUL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: MEASURED .006 INCH OVER BLUEPRINT SPECS (6.190-6.191) ON NR 1 WHEEL OUTSIDE DIAMETER. INSTALLED A NEW NR 1 WHEEL.SDR CA980916035Nozzle · cracked(CAN) PILOT REPORTED TOT OF 813C FOR 6 SECONDS. INSPECTION FOUND THE TURBINE FIRST STAGE NOZZLE CRACKED AND ERODED ON 19 VANES. THE COMBUSTION LINER 980916051 WAS ALSO CRACKED. THE OVERTEMP IS NOT CONSIDERED THE SOURCE OF EITHER THE TURBINE OR COMBUSTION LISDR CA980908042Valve · failed(CAN) ON TEST, SLOW INFLATION OF EMERGENCY FLOAT. DISASSEMBLY OF VALVE SHOWED 2 SUPPORT HEADS AND 2 TEFLON DISCS ON BOTTOM OF VALVE.SDR CA980818022Line · bent(CAN) NR 6 AND NR 7 SCAVENGE OIL LINE (P/N 6853464) REMOVED, FOUND BENT AND DENTED. LINE WAS ALSO INCORRECTLY INSTALLED ONTO NR 8 BEARING SCAVENGE OIL INLET FITTING. NR 8 BEARING SCAVENGE OIL LINE (P/N 6853463) REMOVED, FOUND BENT AND DENTED. THE LINE WAS ASDR HEEA0015043Gear · pittedRECEIVING INSPECTION REVEALED: PITS BEYOND SERVICEABLE LIMITS ON A/O SEP. GEAR TEETH. INSTALLED A NEW A/O SEP. GEAR.
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