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.

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.Aug 17, 1999 · N4302G · Bolkms BO105S · Turbine SectionSDR 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.Aug 17, 1999 · N5421E · Bolkms BO105S · Turbine SectionSDR 99ZZZX3285Case Halves · damagedDRESSED OUT MINOR FOD DAMAGE. REMOVED AND REPLACED.Aug 16, 1999 · N5211K · Hughes 369D · Turbine Engine Compressor SectionSDR 99ZZZX4336Actuator · inoperativeFUEL CONTROL ACTUATOR INOPERATIVE. WILL NOT MOVE IN EITHER DIRECTION. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.Aug 11, 1999 · N485EC · Bolkms BO105S · Fuel Controlling SystemSDR 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. TAug 10, 1999 · N187AA · Bell 206B3 · Fuel Control/Turbine EnginesSDR CA990907032Actuator · malfunctioned(CAN) DURING TAXI, ENGINES WERE NOT IN OPERATING RANGE. FURTHER INVESTIGATION REVEALED THAT GOVERNORS HAD CHANGED FOR UNEXPLAINED REASONS.Aug 5, 1999 · Bolkms BO105C · Turbine GovernorSDR CA991027048Line · chafed(CAN) OIL LEAK TRACED TO MGB OIL LINE WHICH WAS CHAFED THROUGH BY A CLAMP.Aug 1, 1999 · Hughes 369D · Main Rotor GearboxSDR 99ZZZX3856Bleed Valve · inoperativeDURING THROTTLE ROLL-ON DURING POWER RECOVERY FROM PRACTICE AUTOROTATION, THE PILOT EXPERIENCED A COMPRESSOR STALL. REPLACED BLEED VALVE.Jul 30, 1999 · N5074R · Hughes 369D · Compressor Bleed ValveSDR 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.Jul 21, 1999 · N5074R · Hughes 369D · Ignition Harness (Distribution)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.Jul 20, 1999 · N107AL · Bolkms BO105S · Turbine SectionSDR 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.Jul 16, 1999 · Bolkms BO105C · Turbine GovernorSDR ERAA062930Bearing · spalledNR 5 BEARING NEW WHEN INSTALLED. HAS SPALLING AND PITS ON BALLS.Jul 12, 1999 · N298EH · Bolkms BO105S · Turbine SectionSDR CA990728029Window · separated(CAN) RIGHT REAR DOOR WINDOW DEPARTED ROTORCRAFT DURING CRUISE. THIS WINDOW HAD A PREVIOUS CRACK AND WAS A RUBBER MOUNTED WINDOW.Jul 9, 1999 · Hughes 369D · Door WindowsSDR ERAA062926Vane · damagedDIFFUSER VANE ISSUED TO AIRCRAFT BUT COULD NOT BE USED DUE TO BROKEN STUD. ALL STUDS HAVE OVERSIZE DIAMETER.Jul 8, 1999 · N423EH · Bolkms BO105S · Turbine Engine Compressor SectionSDR ERAA062927Vane · crackedDIFFUSER VANE INSPECTED AND ISSUED TO AIRCRAFT, BUT COULD NOT BE INSTALLED DUE TO CRACKED VANE. INCOMPLETE BRAZE AT END OF VANE.Jul 8, 1999 · N423EH · Bolkms BO105S · Turbine Engine Compressor SectionSDR ERAA062928Sump · damagedNEW SUMP CAN HAS IMPERFECTION ON B-NUT FLARE. ISSUED TO AIRCRAFT BUT COULD NOT BE USED.Jul 8, 1999 · N423EH · Bolkms BO105S · Turbine Engine Oil SystemSDR 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.Jun 28, 1999 · Bolkms BO105S · Tail Rotor Control SystemSDR 99ZZZX2602Governor · malfunctionedGOVERNOR SLOW TO RESPOND. REMOVED AND REPLACED.Jun 25, 1999 · N5027P · Hughes 369D · Turbine GovernorSDR 99ZZZX2605Exciter · failedEXCITER WILL NOT CREATE SPARK WITH INPUT VOLTAGE. REMOVED AND REPLACED.Jun 25, 1999 · N7907K · Bell 206B · ExciterSDR 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.Jun 25, 1999 · Hughes 369E · Turbine SectionSDR 20000712SH034Filter · tornUNIT WAS IN FOR OVERHAUL. DISASSEMBLED UNIT FOR INSPECTION AND FOUND FILTER SCREEN TORN AT BRAZE. (X)Jun 22, 1999 · Engine Oil Distribution (Airframe Furnished)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.Jun 18, 1999 · N423EH · Bolkms BO105S · Turbine Engine Compressor SectionSDR ERAA062573Pto Gear · spalledPTO GEAR REMOVED FROM AIRCRAFT DUE TO SPALLING ON GEAR TEETH.Jun 15, 1999 · N293EH · Bolkms BO105S · Turbine Engine Reduction GearSDR HEEA062410Wheel · damagedUPON ASSEMBLY OF P.T. ROTOR; UNABLE TO OBTAIN BALANCE. REPLACEMENT OF NR 4 TURBINE WHEEL CURED PROBLEM. INSTALLED NEW WHEEL.Jun 15, 1999 · N967MB · Bolkms BO105S · Turbine SectionSDR CA990630031Governor · failed(CAN) PT GOVERNOR DROOPS 3 PERCENT TO 5 PERCENT AND OVERSPEEDS 3 PERCENT TO 5 PERCENT. GOVERNOR REPLACED.Jun 14, 1999 · Hughes 369D · Turbine GovernorSDR 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.Jun 14, 1999 · N405EH · Bell 206L · Turbine SectionSDR ERAA062570Seal · mismanufacturedNEW LABYRINTH SEAL THAT COULD NOT BE INSTALLED ON AIRCRAFT DUE TO PILOT DIAMETER OVERSIZED.Jun 14, 1999 · N151EH · Bolkms BO105S · Turbine SectionSDR CA991007058Combustion Case · cracked(CAN) CRACK FOUND IN ARMPIT AREA OF THJE OUTER COMBUSTION CASE.Jun 7, 1999 · Bolkms BO105S · Turbine Engine Combustion SectionSDR 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.Jun 4, 1999 · Hughes 500N · Main Rotor BladesSDR CA991007057Combustion Case · mismanufactured(CAN) COMBUSION CASE RECEIVED WITH THE IGNITOR HOLE DIMMENSION UNDER SIZED BY .25 INCH.Jun 4, 1999 · Bolkms BO105S · Turbine Engine Combustion SectionSDR 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.Jun 1, 1999 · N911EB · Bolkms BO105S · Turbine SectionSDR 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.Jun 1, 1999 · Turbine SectionSDR 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 ANMay 28, 1999 · N881SP · Bell 206B · Reciprocating Engine Cylinder SectionSDR 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.May 27, 1999 · Bolkms BO105C · Main Rotor Transmission MountSDR 99ZZZX2532Spline Adapter · mismanufacturedWHILE PERFORMING TOLERANCE INSPECTION PER OHM, FOUND INTERNAL SPLINES MANUFACTURED OVER LIMITS.May 26, 1999 · Turbine Engine Compressor SectionSDR 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.May 16, 1999 · Hughes 369D · VHF Communications SystemSDR CA990817028Bearing · peeling(CAN) QUANTITY OF 3 BALLS IN SUBJECT BEARING WERE PEELING.May 14, 1999 · Bolkms BO105CBS · Main Rotor GearboxSDR 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.May 11, 1999 · Bell 206L · Directional Gyro and Indicating SystemSDR ERAA062389Wheel · mismanufacturedNEW WHEEL THAT WAS ISSUED TO AIRCRAFT COULD NOT BE INSTALLED BECAUSE WHEEL HAD OVERSIZE DIAMETER AT BLADE TIPS.May 10, 1999 · N127EH · Bolkms BO105S · Turbine SectionSDR 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.May 6, 1999 · Bell 206B3 · Turbine Engine Reduction GearSDR CA990521038Skin · damaged(CAN) DURING INSPECTION, FOUR SMALL CREASES WERE DISCOVERED ON TAILBOOM BETWEEN STATIONS 69.0 AND 72.0.May 5, 1999 · Bell 206B · Rotorcraft Tail BoomSDR CA990513017Case · separated(CAN) DURING MID-POINT INSPECTION, THE COMPRESSOR CASE ASSEMBLY''S PLASTIC LINING WAS FOUND SEPARATED WITH PIECES MISSING.May 4, 1999 · Bell 206L · Turbine Engine Compressor SectionSDR 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 BMay 3, 1999 · Hughes 369D · Turbine Engine Reduction GearSDR 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 BApr 30, 1999 · Bell 206B3 · Turbine Engine Accessory DriveSDR 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 AUTOROTApr 29, 1999 · Bell 206B · Fuel Control/Reciprocating EnginesSDR 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.Apr 29, 1999 · Hughes 369D · Tail Rotor Control SystemSDR CA991007045Bracket · cracked(CAN) DURING INSPECTION, THE UPPER BEARING RETAINER CAP WAS FOUND CRACKED IN TWO. PART REPLACED.Apr 27, 1999 · Hughes 369D · Main Rotor ControlSDR 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.Apr 23, 1999 · Bolkms BO105C · Main Rotor Transmission MountSDR 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.OApr 23, 1999 · N8197X · Bolkms BO105S · Turbine SectionSDR ERAA061871Scroll · mismanufacturedSCROLL COULD NOT BE INSTALLED DUE TO PLATING FLAKING OFF INSIDE RIGHT TURNING VANE.Apr 19, 1999 · N131EH · Bolkms BO105S · Turbine Engine Compressor Section
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