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 HEEA0010558Support · defectiveRECEIVING INSPECTION REVEALED: COATING SOFT AND FLAKING OUT OF P.T. SUPPORT 19-24 SEAL BORE.SDR 97ZZZX3980Bushing · faultyAD 82-24-05 DESCRIBED METHOD OF IDENTIFICATION OF FAULTY PART. UPON INSPECTION OF FUEL CONTROL, FOUND FAULTY PART INSTALLED THOUGH UNIT WAS OVERHAULED 4-23-92. THIS IS THE FOURTH UNIT FOUND WITH PRE-AD BUSHING. RECOMMEND SOURCE INSPECTION AND/OR ONE TIME INSDR CA970731016Elbow · cracked(CAN) CRACK FOUND HALFWAY AROUND CIRCUMFERENCE OF FITTING. CRACK ON SIDE OF FITTING STRESSED DURING TIGHTENING TO STOP OIL LEAK.SDR 97ZZZX3546Bypass Switch · failedSWITCH FAILED TO CLOSE AT PRESCRIBED LIMITS OF DN-41.1 DURING A 300-HOUR INSPECTION. THIS IS THE 7TH SWITCH TO FAIL IN LESS THAN 500 HOURS OF OPERATION SINCE FIRST FAILURE REPORTED ON 12-10-96. THAT FAILURE COULD HAVE PREVENTED AN ENGINE FAILURE DUE TO FUEL SDR HEEA0010466Gearbox Cover · leaksENGINE REMOVED DUE TO AFT T/M LEAK. GEARBOX PARTS INSPECTION REVEALED: LEAKING GEARBOX COVER AFT T/M SLEEVE.SDR 97ZZZX3549Nozzle · failedENGINE PRODUCING LOW POWER. INSPECTED 2ND STAGE TURBINE NOZZLE. FOUND TURBINE WHEEL SHROUD FLAKING AND SEPARATING CAUSING EXCESSIVE TURBINE WHEEL TIP CLEARANCE. FOUND OUTER BAND CRACKED RADIALLY CAUSING GAS PATH LEAKAGE. THIS PART SHOULD MAKE 1,750 HRS AT SDR 97ZZZX3550Wheel · erodedENGINE PRODUCING LOW POWER. REMOVED TURBINE ASSY AND SEPARATED GAS PRODUCER FROM POWER TURBINE. FOUND NR 1 TURBINE WHEEL SEVERELY CORRODED AFTER ONLY 708.5 HRS TT. WHEEL LIFE IS 1775.0 HRS. TIP CLEARANCE WAS ALSO EXCESSIVE. NO EVIDENCE OF FOD. LEADING EDSDR CA970807042Blower · unserviceable(CAN) VIBRATION FROM OIL COOLER BLOWER COULD BE FELT IN THE AIRFRAME AND PILOTS PEDALS. ACCELEROMETER TEST SHOWED HIGH FREQUENCY VIBRATION.SDR AU970787Coupling · failed(AUS) HYDRAULIC PUMP DRIVE COUPLING FAILEDSDR HEEA0010367Bearing Cage · defectiveUNABLE TO TRUE UP 3 & 4 BEARING CAGE I.D. ON MACHINING. INSTALLED A NEW 3 & 4 BEARING CAGE.SDR HEEA0010368Ring · out of specRECEIVING INSPECTION REVEALED: MEASURED .014 OVER B.P. SPECS (.180-.181) ON RING WIDTH. INSTALLED A NEW RING.SDR HEEA0010343Servomotor · failedSERVO WILL NOT ACTUATE OPEN OR CLOSE.SDR AU970898Bearing · spalled(AUS) MAIN ROTOR TRANSMISSION DUPLEX BEARING SPALLED - METALCONTAMINATION OF GEARBOXSDR CA970731020Governor · unserviceable(CAN) GOVERNOR INSTALLED FOR TEST RUN AND HOVER TEST. IN-FLIGHT HOVER AT LOWER POWER SETTINGS THE RPM WOULD FLUCTUATE 5 PERCENT.SDR HEEA0010233Servo Motor · intermittentSERVO MOTOR WORKS INTERMITTENTLY.SDR CA970731019Governor · drooping(CAN) DROOPING 4 PERCENT NR WHEN POWER PULLED IN WITH SLOW OR NO RECOVERY IN RPM UNTIL POWER REDUCED. AIRCRAFT HAD TO LAND BEFORE RECOVERY OF RPM.SDR CA970807040Droop Ring · misinstalled(CAN) DROOP RING WAS FOUND TO BE INCORRECTLY INSTALLED BOTH DROOP RING AND FOLLOWERS WERE INSTALLED UPSIDE DOWN, CAUSING CONTACT BETWEEN THE RING AND LOWER SHOE OF THE MAIN ROTOR HUB. THE LOWER SHOE WAS DAMAGED.SDR AU970841Blade · delaminated(AUS) TAIL ROTOR BLADE DELAMINATED IN DOUBLER AREASDR HEEA0010156P.T. Support · mis machinedRECEIVING INSPECTION REVEALED: I.D. MACHINED UNDERSIZED ON P.T. SUPPORT #7 BEARING BORE.SDR HEEA0010125Rear Diffuser · below specsRECEIVING INSPECTION REVEALED: MEASURED .012 BELOW SPECS (.092-.096) ON REAR DIFFUSER #2 BEARING LOCK KEY GROOVE.SDR HEEA0010126Nozzle · crackedENGINE REMOVED FOR COMPRESSOR OVERHAUL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES. INSTALLED A NEW #1 NOZZLE.SDR CA970722014Trunnion · worn(CAN) PITCH CHANGE TRUNNION WORN BEYOND LIMITS.SDR HEEA0010111N1 Coupling · step wearENGINE REMOVED DUE TO LIGHTNING STRIKE. UPON INSPECTION OF TURBINE PARTS NOTED: STEP WEAR BEYOND SERVICEABLE LIMITS ON N1 COUPLING SPLINES. INSTALLED A NEW N1 COUPLING.SDR HEEA0010113N1 Coupling · defectiveN1 COUPLING DEFECTIVESDR 97ZZZX2904Gearbox · crackedFOUND ENGINE GEARBOX CRACKED AT TOP MOUNTING LOCATION FOR COMPRESSOR. NO ABNORMAL VIBRATIONS OR CIRCUMSTANCES LED TO FINDING CRACK.SDR HEEA0010001Nozzle · crackedENGINE REMOVED DUE TO COMPRESSOR OVERHAUL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #2 NOZZLE DIAPHRAGM AND LIFTING #1 TIP PATH.SDR HAIHEEA9923Wheel · sulfidationTURBINE REMOVED DUE TO #4 WHEEL CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: MINOR SULFIDATION ON ALL BLADES ON #1 WHEEL. SCRAPPED PART.SDR CA970609013Switch · failed(CAN) FLIGHT CONTROL TRIM SWITCH WOULD NOT RETURN TO NEUTRAL POSITION FOLLOWING INSTALLTION.SDR CA970618013Directional Gyro · failed(CAN) SMOKE FILLED COCKPIT WHILE AIRCRAFT WAS ON GROUND. DIRECTIONAL GYRO WAS BURNT INTERNALLY. GYRO REPLACED ALONG WITH CIRCUIT BREAKER THAT FAILED TO TRIP.SDR CA970609035Oil System · metal contam(CAN) IN CRUISE, NR 1 ENG MAGNETIC PLUG LIGHT CAME ON, PILOT ZAPPED IT OFF AND LIGHT WENT OUT. APPROX 5 MINUTES LATER, THE LIGHT CAME ON AGAIN AND COULD NOT BE ZAPPED, EXTINGUISHED. NR 1 ENGINE SHUT DOWN AND UNEVENTUAL LANDING CARRIED OUT. ONE SMALL SLIVER SDR CA970528013Governor · cracked(CAN) CRACKS FOUND IN AREA OF PY BOSS AND AFT CASTING MOUNTING AREA.SDR CA970609010Swashplate · noisy(CAN) DURING SCHEDULED MAINTENANCE, THE T/R SWASHPLATE FELT ROUGH AND NOISY. BEARING CAN BE HEARD RATTLING IN CAGE. THERE DOES NOT APPEAR TO BE ANY LOSS OF LUBRICANT.SDR CA970530009Blade · debonding(CAN) NEW LEADING EDGE INSTALLED PER MDHS NOTICE 187 PT.II .. LEADING EDGE STRIP FOUND STARTING TO DELAMINATE 18 CMS FROM TIP AND 3 CM TOWARD ROOT. BLADE FLOWN 111.4 HOURS AFTER REPAIR .SDR HAIHEEA9830Shield · crackedENGINE REMOVED DUE TO TURBINE #1 AND #2 WHEEL CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE SHIELD ABOUT 75 PERCENT AROUND DOME AND EXTENDING INTO THE CENTER OF DOME UNDER DEFLECTOR. CEB-A-1341 WASCOMPLIED WISDR HAIHEEA9831Wheel · blade defectsTURBINE REMOVED DUE TO CYCLED OUT #1 AND #2 WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED: MINOR SULFIDATION ON ALL BLADES ON #1 WHEEL. SCRAPPED PART.SDR CA970528016Plate · warped(CAN) BOTH THE NR 8 BEARING OIL NOZZLE AND EXTERNAL LEAKED ON INSTALLATION OF TURBINE. BOTH CRUSH WASHERS CHANGED. NR 8 BEARING STOPPED LEAKING, BUT EXTERNAL SUMP BECAME PROGRESSIVELY WORSE. WARPED SUMP MOUNTING PLATE CAUSED PROBLEM.SDR 97ZZZX2753Governor · defectiveNR 1 ENGINE WOULD NOT BEEP PAST 95 PERCENT N2. REPLACED GOVERNOR, CURED PROBLEM.SDR 97ZZZX2754Governor · defective18 PERCENT TORQUE SPLIT. REPLACED GOVERNOR CURED PROBLEM.SDR HAIHEEA9730Linear Actuator · sticksLINEAR ACTUATOR STICKS IN EXTENDED POSITION.SDR 97ZZZX2824Governor · failedGOVERNOR FAILED TO MAINTAIN N2 ROTOR SPEED. HAVING ALOT OF PROBLEMS WITH THESE GOVERNORS FAILING AT ABOUT THIS TIME. THE COUPLINGS ON THESE GOVERNORS DO NOT HOLD UP. REPLACED GOVERNOR WITH SERVICEABLE ITEM.SDR HAIHEEA9672Valve · inoperativeVALVE WILL NOT OPEN.SDR HAIHEEA9624Nozzle Shield · crackedENGINE REMOVED DUE TO F.O.D. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE SHIELD DOME AS MARKED. INSTALLED A STANDARD AERO OVERHAULED #1 NOZZLE SHIELD.SDR CA970609006Gearbox · making metal(CAN) METAL FOUND ON CHIP DETECTORS, MAINLY LOWER ONE, AND IN ENGINE AND NICAD FILTER. OIL AND FILTERS REPLACED. SYSTEM FLUSHED. MORE CHIPS ONE HOUR LATER. GEARBOX REPLACED.SDR HAIHEEA9460Actuator · inoperativeENGINE LINEAR ACTUATOR INOPERATIVE.SDR HAIHEEA9456Shaft · stepwearENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF COMPRESSOR PARTS NOTED: STEPWEAR BEYOND SERVICEABLE LIMITS ON SPUR GEAR SHAFT AFT SPLINES. INSTALLED A NEW SPUR GEARSHAFT.SDR CA970716006Gearbox · blocked oil flow(CAN) ENGINE OIL PRESSURE DROPPED TO ZERO, TORQUE PRESSURE DROPPED TO 30 PERCENT. EMERGENCY DESCENT WAS CARRIED OUT. UPON TOUCHDOWN, SMOKE ENVELOPED THE AIRCRAFT AND ENGINE WAS IMMEDIATELY SHUT DOWN. INVESTIGATION REVEALED THAT A PLUG OF METALSET ADHESIVE USEDSDR HAIHEEA9408Valve Assy · leakageVALVE ASSY INTERNAL LEAKAGE.SDR CA970609014Bearing · failed(CAN) SEVERAL SMALL SLIVERS AND FLAKES OF METAL FOUND IN MAIN GEARBOX OIL FILTER. OIL ANALYSIS INDICATE BEARING MATERIAL FAILURE. GEARBOX REPLACED.SDR 97ZZZX1415Filter Assy · crackedGEARBOX FILTER ASSY EPOXY IS CRACKED.SDR AU970460Exciter · failed(AUS) ENGINE EXCITER BOX FAULTY - EXCITER BOX WAS A REPLACEMENT FOR A DEFECTIVE EXCITER BOX PREVIOUSLY REMOVED FOR CORRODED OUTPUT TERMINAL - BOX WAS OK FOR THE FIRST START BUT THEN FAILED
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