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 HEEA967623Nozzle Vanes · crackedENGINE REMOVED DUE TO CRACKED COMPRESSOR SCROLL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES AND EXCESSIVE RUNOUT BEYOND SERVICEABLE LIMITS OAug 2, 1996 · N54197 · Bolkms BO105S · Turbine SectionSDR HEEA967624Nozzle Vanes · crackedTURBINE REMOVED DUE TO 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES. REPLACED DISCREPANT PART.Aug 2, 1996 · N7161J · Bolkms BO105S · Turbine SectionSDR HEEA967627Nozzle · crackedENGINE REMOVED DUE TO CARBON 6 & 7 OIL PRESSURE STRUT. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES. REPLACED DISCREPANT PART.Aug 2, 1996 · N9190Y · Bolkms BO105S · Turbine SectionSDR HEEA967628Nozzle · out of specPART INSTALLED IN TURBINE AND TEST CELL RAN PRODUCED -5.9-4.5-4.5 (NOTE TURBINE PRODUCED -1.1,+0.5+0.5 WITH DALLAS AIRMOTIVE OH #1 NOZZLE) UPON INSPECTION OF PART NOTED THE FOLLOWING: OUT OF OVERHAUL SPECS.A,B,E & F. REPLACED DISCREPANT PART.Aug 2, 1996 · N7136J · Bolkms BO105S · Turbine SectionSDR CA960813007Retaining Ring · detached(CAN) MAG PLUG LIGHT ON ENGINE NR 2. FOUND METAL ON BOTH PLUGS AND ON DISASSEMBLY FOUND THE RETAINING RING AND THE FLAT WASHER WHICH HOLD THE NR 5 BEARING OUTER RACE, RESTING IN THE BEARING BORE AREA. IT WAS UNDETERMINED HOW THE RING CAME OUT OF ITS GROOVE OJul 30, 1996 · Turbine SectionSDR CA970311038Blower Assembly · loose(CAN) PRIOR TO INSTALLATION A VISUAL INSPECTION REVEALED THAT THE FAN TO SHAFT ATTACHING HARDWARE WAS LOOSE.Jul 30, 1996 · Bell 206B · Rotorcraft Cooling Fan SystemSDR 96ZZZX4838Exciter · failedSTART CIRCUIT BREAKER OPENED 1-2 SECONDS AFTER START INITIATED. TROUBLESHOT AND FOUND HIGH TENSION SIDE OF IGNITION EXCITER SHORTED OUT. REPLACED EXCITER. THIS AIRCRAFT HAS CONTINUOUS IGNITION SYSTEM WHICH MUST BE OPERATED WHEN FLYING IN FALLING SNOW. THISJul 29, 1996 · N204PC · Bolkms BO105S · ExciterSDR AU961110Turbine Wheel · cracked(AUS) FOURTH STAGE TURBINE WHEEL CRACKED THROUGH RIMJul 29, 1996 · Turbine SectionSDR CA970311035Belt · damaged(CAN) PILOT NOTICED A VIBRATION, MAINTENANCE FOUND TEETH MISSING OFF THE BELT.Jul 27, 1996 · Hughes 369D · Rotorcraft Cooling Fan SystemSDR CA960801021Exducer · cracked(CAN) WHILE DOING A TURBINE CHANGE, AME FOUND A CRACK IN THE COMPRESSOR DISCHARGE TUBE. SUSPECT CRACK WAS CAUSED BY MECHANICAL DAMAGE.Jul 26, 1996 · Bell 206L · Turbine Engine Compressor SectionSDR 96ZZZX4841Tie Bolt · undersizeDISCOVERED DEFECT DURING TOLERANCE INSPECTION. THE TIE BOLT SHOULDER UNDER SIZE BY .002 INCH, .440 INCH, BPS .4420 INCH TO .4425 INCH.Jul 25, 1996 · N107AL · Bolkms BO105S · Turbine Engine Compressor SectionSDR CA960826103Output Shaft · bulged(CAN) WHILE ACCOMPLISHING CF-88-09 PER DN 148.1, BULGE OR DEFORMATION FOUND ON THE UPPER DISC.TIME SINCE LAST INSPECTION, 293 HOURS.Jul 20, 1996 · Hughes 369D · Main Rotor GearboxSDR CA960812016Hub · unbalanced(CAN) TAIL ROTOR INSTALLED AFTER OVERHAUL. UNABLE TO BALANCE TAIL ROTOR ASSEMBLY AFTER SEVERAL RUNS. UNIT REMOVED AND REPLACED.Jul 19, 1996 · Bell 206B · Tail Rotor HeadSDR CA960826039Rotor Assembly · out of balance(CAN) ON INSTALLATION AFTER REPAIR, UNABLE TO BALANCE TAIL ROTOR ASSEMBLY AFTER SEVERAL RUNS, UNIT REJECTEDJul 19, 1996 · Bell 206B · Tail Rotor SystemSDR ERAA96284Scroll · damagedSCROLL OVERHAULED 6-13-96 AND HAS THREAD DAMAGE TO STUD AS MARKED.Jul 19, 1996 · N124EH · Bolkms BO105S · Turbine Engine Compressor SectionSDR ERAA96281Gear · pittedFUEL CONTROL/OIL PUMP GEAR WAS O/H AND RETURNED TO ERA 7/10/96 RECEIVED BACK WITH PITS IN GEAR TEETH.Jul 16, 1996 · N124EH · Bolkms BO105S · Turbine Engine Accessory DriveSDR ERAA96283Fuel Control · defectiveFUEL CONTROL WILL NOT METER FUEL. OVERHAULED 11-95; HAS 486.8 HRS TSO.Jul 16, 1996 · N127EH · Bolkms BO105S · Fuel Control/Turbine EnginesSDR HEEA967582Wheel · defectiveENGINE REMOVED DUE TO SMOKE ON SHUTDOWN. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.Jul 16, 1996 · N721MB · Bolkms BO105S · Turbine SectionSDR HEEA967583Wheel · defectiveENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.Jul 16, 1996 · N50293 · Bolkms BO105S · Turbine SectionSDR ERAA96278Vane Assy · failedVANE ASSY SENT FOR OVERHAUL ON STANDARD AERO WORK ORDER L127225 2-9-96. VANE ASSY HAS -0- TSO AND STUB BROKE OFF DURING INSTALLATION.Jul 15, 1996 · N124EH · Bolkms BO105S · Turbine SectionSDR ERAA96277Nozzle · cracked#2 NOZZLE HAS CRACKS IN OUTER BAND AND VANES.Jul 11, 1996 · N125EH · Bolkms BO105S · Turbine SectionSDR CA961021005Blade · separated(CAN) WHILE COMING IN TO LAND, THE PILOT NOTICED A SUDDEN INCREASE IN TOT AND VIBRATION LEVELS. LANDED IMMEDIATELY, NO PROBLEMS. TURBINE INSPECTION REVEALED ONE 1ST STAGE BLADE HAD SEPARATED FROM THE TURBINE DISC AT APPROXIMATELY .150 INCHES FROM BLADE ROOT.Jul 10, 1996 · Hughes 369D · Turbine SectionSDR ERAA96276Nozzle · cracked#1 NOZZLE WAS RET'D FROM OVERHAUL , 10-4-95. T.S.O. IS 174.2 HRS AND NOZZLE HAS CRACKED OUTER BAND AND VANES.Jul 10, 1996 · N125EH · Bolkms BO105S · Turbine SectionSDR CA960719103Line · cracked(CAN) AT LOWER POWER SETTINGS, ENGINE UNDER SPEC FOR POWER. AT HIGHER POWER SETTINGS (MAX TORQUE) ENGINE ON SPEC FOR POWER. FOUND RIGID LINE BETWEEN BLEED VALVE AND ENGINE COMPRESSOR CRACKED ALL THE WAY AROUND THE TUBE UNDER THE 'B' NUT. LINE REPLACED.Jul 8, 1996 · Hughes 369D · Engine Bleed Air SystemSDR CA970311024Blade · paint erosion(CAN) PAINT GONE ON ONE BLADE.Jul 6, 1996 · Bell 206B · Tail Rotor BladesSDR 96ZZZX5502Combustion Case · crackedENGINE COMBUSTION CASE CRACKED AT 'ARMPIT' THROUGH WIRE MESH REINFORCEMENT. ENGINE SHOWED A CONTINUING TREND OF LOW POWER. REPLACED CASE.Jul 5, 1996 · N493HL · Bolkms BO105CBS · Turbine Engine Combustion SectionSDR HEEA967499Scroll Assy · oversizeUPON PRE-ASSEMBLY INSPECTION OF PART NOTED THE FOLLOWING: I.D. OVERSIZED ON SCROLL PROBE ELBOW BORE AS MARKED. REPLACED DISCREPANT PART. PART RETURNED TO DALLAS AIRMOTIVE FOR 100% WARRANTY REPAIR PER ROB HALDEMEN'S INSTRUCTIONS.Jul 5, 1996 · N2269A · Bell 206B3 · Turbine Engine Compressor SectionSDR HEEA967503Nozzle · crackedTURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS FOUND CRACKED 1ST STAGE NOZZLE VANES AND INNER BARREL. REPLACED DISCREPANT PART.Jul 5, 1996 · N2268A · Bell 206B3 · Turbine SectionSDR CA960723001Clamp · loose(CAN) PILOT EXPERIENCED A MOMENTARY JAMMED T/R PEDAL. INSPECTION FOUND THE CLAMP AT THE AFT SECTION OF THE EXHAUST STACK HAD DEPARTED CAUSING DAMAGE TO THE TAILBOOM, T/R ASSEMBLY, T/R SWASHPLATE AND T/R CONTROL ROD.Jul 2, 1996 · Hughes 369D · Engine Collector/Tailpipe/NozzleSDR HEEA967494Tie Bolt · defectiveUPON ASSEMBLY OF COMPRESSOR NOTED THE FOLLOWING: UNABLE TO ENGAGE THREADS INTO 1ST STAGE WHEEL. UPON INSPECTION OF PART NOTED THE FOLLOWING: IMPROPERLY MACHINED THREADS ON TIE BOLT FWD END. REPLACED DISCREPANT PART.Jul 2, 1996 · N7136J · Bolkms BO105S · Turbine Engine Compressor SectionSDR HEEA967496Wheel · eroded bladesENGINE REMOVED DUE TO CYCLED OUT WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SEVERE EROSION ON #1 AND #2 WHEEL BLADES LEADING EDGES. SCRAPPED 1ST STAGE WHEEL.Jul 2, 1996 · N2275Q · Bell 206B3 · Turbine SectionSDR HEEA967497Wheel · eroded bladesENGINE REMOVED DUE TO CYCLED OUT WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SEVERE EROSION ON #1 AND #2 WHEEL BLADES LEADING EDGES. SCRAPPED 1ST STAGE WHEEL.Jul 2, 1996 · N2275Q · Bell 206B3 · Turbine SectionSDR HEEA967493Nozzle · crackedENGINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKS BEYOND LIMITS ON #2 NOZZLE BRAZED AREA BETWEEN DIAPHRAGM AND VANE INNER BAND. REPLACED DISCREPANT PART.Jun 28, 1996 · N205UC · Bolkms BO105S · Turbine SectionSDR ERAA96266Wheel · wornWHEEL HAS WORN CURVIC DUE TO OUTER SHAFT THAT WAS PURCHASED FROM SUPERIOR , THAT HAS MATERIAL AROUND CURVIC FLAKING OFF. WORN WHEEL IS DUE TO OUTER SHAFT PROBLEM. THE #4 WHEEL IS AN ALLISON PART. SEE ERAA MMIR REPORT #ERAA000258.Jun 27, 1996 · N296EH · Bolkms BO105S · Turbine SectionSDR ERAA96267Gearbox Cover · leakingGEARBOX OVERHAULED ON CADORATH WORK ORDER M708 AND RETURNED TO ERA 6-13-96. TORQUE METER BUSHING LEAKING.Jun 27, 1996 · N297EH · Bolkms BO105S · Turbine Engine Reduction GearSDR ERAA96268Gearbox Cover · leakingGEARBOX OVERHAULED ON CADORATH WORK ORDER L707 AND REC'D BACK AT ERA 6-11-96. TORQUE METER BUSHING LEAKING.Jun 27, 1996 · N130EH · Bolkms BO105S · Engine Fuel DistributionSDR CA960723016Bearing · making metal(CAN) NR 2 ENGINE MAGNETIC PLUG WARNING LIGHT CAME ON IN-FLIGHT. PILOT REDUCED POWER TO IDLE ON NR 2 ENGINE AND RETURNED TO RAMP. LOWER MAGNETIC PLUG HAD HEAVY ACCUMULATION OF FINE METAL PARTICLES. FURTHER INVESTIGATION REVEALED THAT NR 2 1/2 BEARING WAS THJun 26, 1996 · Turbine Engine Accessory DriveSDR ERAA96259Spline Adapter · coat flakeCOATING OF SPLINED ADAPTER IS FLAKING OFF.Jun 24, 1996 · N297EH · Bolkms BO105S · Turbine SectionSDR ERAA96260Nozzle · cracked#1 NOZZLE CRACKED.Jun 24, 1996 · N297EH · Bolkms BO105S · Turbine SectionSDR ERAA96261Spline Adapter · plating flakePLATING FLAKING OFF OF SPLINED ADAPTER.Jun 24, 1996 · N296EH · Bolkms BO105S · Turbine SectionSDR ERAA96263Nozzle · pluggedFOUR AIR HOLES ON #2 NOZZLE PLUGGED.Jun 24, 1996 · N297EH · Bolkms BO105S · Turbine SectionSDR ERAA96264Governor · malfunctionGOVERNOR WAS OVERHAULED 7/95 AND HAS 590.1 HRS TSO. GOVERNOR IS SLOW TO REACT.Jun 24, 1996 · N134EH · Bolkms BO105S · Turbine GovernorSDR ERAA96256U Ring Gasket · splitU RING GASKET SPLIT.Jun 21, 1996 · N297EH · Bolkms BO105S · Turbine SectionSDR ERAA96257Outer Shaft · worn curvicOUTER SHAFT HAS WORN CURVIC.Jun 21, 1996 · N297EH · Bolkms BO105S · Turbine SectionSDR ERAA96258Outer Shaft · material flakeMATERIAL AROUND CURVIC IS FLAKING OFF.Jun 21, 1996 · N296EH · Bolkms BO105S · Turbine SectionSDR CA960703020Driveshaft · worn(CAN) WHILE CONDUCTING A TURBINE CHANGE, AME REMOVED THE POWER TURBINE GOVERNOR AND FOUND THAT THE EPOXY, THE RETAINING RING, AND SHIM HAD FALLEN OFF. THE DRIVESHAFT SPLINES WERE WORN.Jun 20, 1996 · Turbine GovernorSDR HEEA967419Engine · low powerENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.Jun 17, 1996 · N7136H · Bolkms BO105S · Turbine SectionSDR HEEA967421Nozzle · crackedENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES. REPLACED DISCREPANT PART.Jun 17, 1996 · N7136H · Bolkms BO105S · Turbine SectionSDR ERAA96246Sump Cover · defectivePART SENT FOR OVERHAUL AND RETURNED TO ERA 9-18-95. LARGE U-RING SEALING SURFACE NOT TRUE. U-RING WILL NOT CRUSH EVENLY AND LEAKS.Jun 14, 1996 · N124EH · Bolkms BO105S · Turbine SectionSDR ERAA96247Governor · malfunctionGOVERNOR CAUSES TORQUE SPLIT 12% ON TAKEOFF AND CRUISE. GOVERNOR WAS OVERHAULED 9-18-96.Jun 14, 1996 · N133EH · Bolkms BO105S · Turbine Governor
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