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 HEEA063665Bearing Cage · damagedNEW PART ASSEMBLY INSPECTION REVEALED EXCESSIVE BEARING BORE RUN-OUT ON NR 8 BEARING CAGE INSTALLED IN SUPPORT AND UNINSTALLED. INSTALLED NEW BEARING CAGE.SDR HEEA063668Seal · chippedENGINE REMOVED DUE TO TURBINE OVERHAUL. UPON INSPECTION OF TURBINE PARTS NOTED: PITS AND CHIPPING ON CARBON SEAL MATING SURFACE. INSTALLED NEW CARBON SEAL.SDR 99ZZZX3285Case Halves · damagedDRESSED OUT MINOR FOD DAMAGE. REMOVED AND REPLACED.SDR 99ZZZX4336Actuator · inoperativeFUEL CONTROL ACTUATOR INOPERATIVE. WILL NOT MOVE IN EITHER DIRECTION. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR 99ZZZX4645Fcu · failedDURING AN UNSCHEDULED REPLACEMENT OF THE FUEL CONTROL, INSTALLED A TSO ZERO FUEL CONTROL, SN 319211. GROUND RAN ACFT, COMPLETED LEAK CHECK AND ATTEMPTED TO SHUTDOWN. THE ENGINE WOULD NOT TURN OFF. SEVERAL OTHER ATTEMPTS MADE TO SHUTDOWN WITH NO RESULTS. TSDR CA990907032Actuator · malfunctioned(CAN) DURING TAXI, ENGINES WERE NOT IN OPERATING RANGE. FURTHER INVESTIGATION REVEALED THAT GOVERNORS HAD CHANGED FOR UNEXPLAINED REASONS.SDR CA991027048Line · chafed(CAN) OIL LEAK TRACED TO MGB OIL LINE WHICH WAS CHAFED THROUGH BY A CLAMP.SDR 99ZZZX3856Bleed Valve · inoperativeDURING THROTTLE ROLL-ON DURING POWER RECOVERY FROM PRACTICE AUTOROTATION, THE PILOT EXPERIENCED A COMPRESSOR STALL. REPLACED BLEED VALVE.SDR 99ZZZX3859Ignition Lead · damaged(ALLISON EQUIVALENT P/N 6870855) ON INSPECTION, THE CONTACT SLEEVE AT THE 16NOTOR END WS FOUND TO BE MISSING THE CIRCLIP RETAINER AND THE CONTACT SLEEVE HAD SLIPPED BACK INTO THE INSULATOR.SDR ALG2002F00045Turbine Wheel · damagedUPON DISASSEMBLY OF TURBINE FOR EVALUATION DUE TO ENGINE QUITTING DURING OPERATION. UPON INSPECTION OF ALL PARTS NR 2 WHEEL HAD ONE BLADE MISSING. PERFORM INSPECTION OF WHEELS UPON ASSEMBLY AT MANUFACTURER FOR POSSIBLE IMPERFECTIONS.SDR CA990907031Spring · broken(CAN) ENGINE PERFORMANCE ON TAKEOFF WAS ERRATIC. SUBSEQUENT INVESTIGATION REVEALED THAT GOVERNOR LEVER SPRINGS P/N 105-60583-12 WERE BROKEN OFF ON BOTH ENGINES.SDR ERAA062930Bearing · spalledNR 5 BEARING NEW WHEN INSTALLED. HAS SPALLING AND PITS ON BALLS.SDR CA990728029Window · separated(CAN) RIGHT REAR DOOR WINDOW DEPARTED ROTORCRAFT DURING CRUISE. THIS WINDOW HAD A PREVIOUS CRACK AND WAS A RUBBER MOUNTED WINDOW.SDR ERAA062926Vane · damagedDIFFUSER VANE ISSUED TO AIRCRAFT BUT COULD NOT BE USED DUE TO BROKEN STUD. ALL STUDS HAVE OVERSIZE DIAMETER.SDR ERAA062927Vane · crackedDIFFUSER VANE INSPECTED AND ISSUED TO AIRCRAFT, BUT COULD NOT BE INSTALLED DUE TO CRACKED VANE. INCOMPLETE BRAZE AT END OF VANE.SDR ERAA062928Sump · damagedNEW SUMP CAN HAS IMPERFECTION ON B-NUT FLARE. ISSUED TO AIRCRAFT BUT COULD NOT BE USED.SDR CA991027063Pedal · stiff(CAN) PILOT NOTED THAT TAIL ROTOR PEDALS WERE STIFF ON PRE-FLIGHT CHECK. TAIL ROTOR PITCH CHANGE SYSTEM CHECKED AND CLEANED. AIRCRAFT RETURNED TO SERVICE.SDR 99ZZZX2602Governor · malfunctionedGOVERNOR SLOW TO RESPOND. REMOVED AND REPLACED.SDR 99ZZZX2605Exciter · failedEXCITER WILL NOT CREATE SPARK WITH INPUT VOLTAGE. REMOVED AND REPLACED.SDR CA990728024Wheel · failed(CAN) ENGINE FAILURE. INITIAL INVESTIGATION SHOWS FAILURE OF NR 1 GP WHEEL, POSSIBLY DUE TO OVER-TEMPERATURE. INITIAL TESTING OF TEMP SENSING SYSTEM SHOWS ERROR OF 80 DEGREES CELCIUS.SDR 20000712SH034Filter · tornUNIT WAS IN FOR OVERHAUL. DISASSEMBLED UNIT FOR INSPECTION AND FOUND FILTER SCREEN TORN AT BRAZE. (X)SDR ERAA062925Rear Diffuser · misoverhauledREAR DIFFUSER SENT FOR OVERHAUL AND RETURNED TO ERA 1-21-99. GROOVE ON RIBBED SIDE OF MOUNT EAR, AREA A. ALLISON O/H MANUAL FIG. 6-16.SDR ERAA062573Pto Gear · spalledPTO GEAR REMOVED FROM AIRCRAFT DUE TO SPALLING ON GEAR TEETH.SDR HEEA062410Wheel · damagedUPON ASSEMBLY OF P.T. ROTOR; UNABLE TO OBTAIN BALANCE. REPLACEMENT OF NR 4 TURBINE WHEEL CURED PROBLEM. INSTALLED NEW WHEEL.SDR CA990630031Governor · failed(CAN) PT GOVERNOR DROOPS 3 PERCENT TO 5 PERCENT AND OVERSPEEDS 3 PERCENT TO 5 PERCENT. GOVERNOR REPLACED.SDR ERAA062569Nozzle · malfunctionedEXCHANGE UNIT SENT TO ERA D/AIRMOTIVE W/O LA0845 6-9-99. COULD NOT BE USED ON AIRCRAFT DUE TO NR 4 BTP RUNOUT OUT OF LIMITS.SDR ERAA062570Seal · mismanufacturedNEW LABYRINTH SEAL THAT COULD NOT BE INSTALLED ON AIRCRAFT DUE TO PILOT DIAMETER OVERSIZED.SDR CA991007058Combustion Case · cracked(CAN) CRACK FOUND IN ARMPIT AREA OF THJE OUTER COMBUSTION CASE.SDR CA990630010Blade · damaged(CAN) UPON INSPECTION, A VOID WAS DETECTED IN THE GRIP PLATE THAT IS BEYOND THE MANUFACTURER'S SET FORTH REPAIRABLE LIMITS AND ALSO OUTSIDE THE PARAMETERS OFADS AND SBS THAT CALL FOR INSPECTION FOR THESE PROBLEMS.SDR CA991007057Combustion Case · mismanufactured(CAN) COMBUSION CASE RECEIVED WITH THE IGNITOR HOLE DIMMENSION UNDER SIZED BY .25 INCH.SDR HEEA062408Nozzle Shield · crackedENGINE REMOVED DUE TO SMOKE ON SHUTDOWN. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE SHIELD DOME AS MARKED.SDR HEEA062409Seal · pittedENGINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: PITS BEYOND SERVICEABLE LIMITS ON CARBON SEAL MATING SURFACE.SDR 99ZZZX2603Valve · brokenTHE INSPECTION OF THE ENGINE REVEALED NR 3 EXHAUST STACK MOUNTING FLANGE AND SEVERAL OF THE CYLINDER STUDS WERE BROKEN. THE CARBURETOR AIR FILTER BOX WAS BLOWN OPEN AT THE SEAMS. IT APPEARS TO BE FROM ENGINE BACKFIRE. ALL CYLINDERS HAD NORMAL COMPRESSION ANSDR CA990531026Frame · corroded(CAN) DURING A PAST MAJOR INSPECTION, THE TRANSMISSION A-FRAME WAS COVERED WITH HEAT SHRINK FOR PROTECTION. AT THE NEXT MAJOR INSPECTION, HEAT SHRINK WAS REMOVED. RT AND LT FRAMES WERE CORRODED BEYOND LIMITS (80 PERCENT) AND WERE SUBSEQUENTLY SCRAPPED.SDR 99ZZZX2532Spline Adapter · mismanufacturedWHILE PERFORMING TOLERANCE INSPECTION PER OHM, FOUND INTERNAL SPLINES MANUFACTURED OVER LIMITS.SDR CA990603003Radio · intermittent(CAN) WHILE DISPLAYING FREQUENCY ON STANDBY, THE COMM DISPLAY DISAPPEARS LEAVING ONE DIGIT INTERMITTENT AND RETURNS TO NORMAL AFTER TUNING KNOB IS MOVED ANOTHER CLICK.SDR CA990817028Bearing · peeling(CAN) QUANTITY OF 3 BALLS IN SUBJECT BEARING WERE PEELING.SDR CA990927032Gyro · cracked(CAN) PILOT REPORTED SMOKE IN THE COCKPIT AND THEN LANDED. INVESTIGATION REVEALED THAT THE BACK OF THE DIRECTIONAL GYRO WAS CRACKED AND HAD MELTED PLASTIC DRIPPING OUT. DG WAS INSTALLED AT 11,355.1 HOURS. AIRFRAME TIME, 0.0 HOURS TSO.SDR ERAA062389Wheel · mismanufacturedNEW WHEEL THAT WAS ISSUED TO AIRCRAFT COULD NOT BE INSTALLED BECAUSE WHEEL HAD OVERSIZE DIAMETER AT BLADE TIPS.SDR AU990493Seal · damaged(AUS) ENGINE ACCESSORY GEARBOX REAR DOUBLE LIP SEAL FAULTY. INVESTIGATION FOUND THE SEALING LIP TORN. THE GEARBOX HAD BEEN RECENTLY REPAIRED AND IT IS SUSPECTED THAT THE SEAL WAS DAMAGED DUE TO INCORRECT INSTALLATION.SDR CA990521038Skin · damaged(CAN) DURING INSPECTION, FOUR SMALL CREASES WERE DISCOVERED ON TAILBOOM BETWEEN STATIONS 69.0 AND 72.0.SDR CA990513017Case · separated(CAN) DURING MID-POINT INSPECTION, THE COMPRESSOR CASE ASSEMBLY''S PLASTIC LINING WAS FOUND SEPARATED WITH PIECES MISSING.SDR CA990521003Bearing · making metal(CAN) METAL FLAKES WERE FOUND IN THE CHIP DETECTOR. THE CHIP DETECTOR WAS CLEANED AND THE ENGINE GROUND RUN. THE CHIP LIGHT ILLUMINATED AT GROUND IDLE. THE ENGINE WAS REMOVED DUE TO EXCESSIVE METAL IN THE CHIP DETECTOR. DISASSEMBLY FOUND THE NR 3 AND NR 4 BSDR AU990483Gear · wrong part(AUS) ENGINE ACCESSORY GEARBOX 2.5 BEARING INCORRECTLY POSITIONED DUE TO THE INCORRECT FITMENT OF THE HELICAL GEAR. THE GEAR HAD BEEN INSTALLED IN THE REVERSE POSITION. THE GEARBOX HAD JUST BEEN RECEIVED FROM THE OVERHAUL FACILITY FOLLOWING REPAIRS AND WAS BSDR CA990510029Carburetor · malfunctioned(CAN) IN CRUISE AT 5,000 FEET, THE RPM OF THE TURBINE AND ROTOR WAS INCREASING. THE MAIN ROTOR BLADE PITCH WAS INCREASED AND THE TORQUEMETER SHOWED AN EXCEEDANCE OF 105 PERCENT. REDUCTION OF THE POWER LEVER MAINTAINED THE ROTOR AND ENGINE SPEEDS. AN AUTOROTSDR CA990531001Torque Tube · cracked(CAN) T/R PEDAL ASSY REMOVED FOR 0/H. UPON DISASSEMBLY INSPECTION, A CRACK WAS FOUND IN THE TORQUE TUBE. THE CRACK PROPAGATED FROM BOTH SIDES OF THE CENTER HOLE WHERE THE CONTROL ROD BELLCRANK ATTACHES.SDR CA991007045Bracket · cracked(CAN) DURING INSPECTION, THE UPPER BEARING RETAINER CAP WAS FOUND CRACKED IN TWO. PART REPLACED.SDR CA990430009Support · corroded(CAN) DURING INSPECTION OF TRANSMISSION SUPPORTS AND UPON REMOVAL OF CLEAR ADHESIVE TAPE, MINOR SURFACE CORROSION WAS FOUND ON FORWARD STRUT OF LT SUPPORT ASSY. CORROSION WAS IN AREA WHERE PAINT HAD FLAKED OFF. CORROSION REMOVED, AREA TREATED AND RE-PAINTED.SDR HEEA061872Nozzle · crackedPILOT HEARD LOUD BANG WHILE IN CRUISE FLIGHT, SECURED NR 1 ENGINE AND MADE SINGLE ENGINE LANDING. N1 AND N2 LOCKED DUE TO GP ROTOR FAILURE. SUSPECTED CAUSE WAS NR 2 NOZZLE DIAPHRAGM CRACKED 360 DEGREES AROUND, MOVING FORWARD CONTACTING NR 2 WHEEL CAUSING F.OSDR ERAA061871Scroll · mismanufacturedSCROLL COULD NOT BE INSTALLED DUE TO PLATING FLAKING OFF INSIDE RIGHT TURNING VANE.
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