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 CA970311083Blower Assy · vibration(CAN) BLOWER ASSY DEVELOPED A VIBRATION SHORTLY AFTER INSTALLATION. BUTTERFLY VALVE WAS CRACKED AND SQUIRREL CAGE OF BLOWER WAS LOOSE DUE TO BEARING FAILURE.SDR HEEA978900Nozzle Vanes · crackedYNGINE REMOVED DUE TO TURBINE 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED AND BOWED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES. INSTALLED A NEW NR 1 NOZZLE.SDR HEEA978901Nozzle Vane · crackedNOZZLE CRACKED. ENGINE REMOVED DUE TO LOW POWER AND TURBINE CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED AND BOWED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES. INSTALLED A NEW NR 1 NOZZLE.SDR HEEA978902Nozzle Vane · crackedENGINE REMOVED DUE TO METAL, COMPRESSOR STALLS AND SMOKE ON SHUTDOWN. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED AND BOWED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES. REPLACED WITH NEW NR 1 NOZZLE.SDR HEEA978903Nozzle · crackedENGINE REMOVED DUE TO METAL, COMPRESSOR STALLS AND SMOKE ON SHUTDOWN. UPON INSPECTION OF TURBINE PARTS NOTED: RUNOUT BEYOND SERVICEABLE LIMITS ON #2 NOZZLE 1ST AND 2ND STAGE TIP PATH AND CRACKED LEADING EDGE AND TRAILING EDGE AS MARKED. REPLACED WITH DALLAS SDR HEEA978905Gearshaft · below specRECEIVING INSPECTION REVEALED: O.D. .0005 BELOW SPECS ON GEAR AFT BEARING SHAFT. INSTALLED A NEW GEAR.SDR HEEA978906Spline Adapter · below specsRECEIVING INSPECTION REVEALED: MEASURED .0034 BELOW BLUEPRINT SPECS (.8994 MIN) ON EXTERNAL SPLINES.SDR HEEA978907Spline Adapter · below specsRECEIVING INSPECTION REVEALED: SPLINE ADAPTER MEASURED .0039 - .0059 BELOW SPECS (.8994 MIN BP) ON COUPLING EXTERNAL SPLINES OF THE FOLLOWING SERIAL NUMBERS: (1) 65186 .0044 BELOW SPECS (2) 64943 .0059 BELOW SPECS (3) 65060 .0054 BELOW SPECS (4) 65131.0SDR CA970311082Gear Leg · cracked(CAN) REMOVED FOR "SMOKING" RIVETS ON END CAP. FOUND CRACK EXTENDING FROM FORE/AFT STRUT ATTACHMENT HOLE.SDR 97ZZZX898Switch · failedAIRCRAFT EXPERIENCED A POWER LOSS AND MADE A PRECAUTIONARY LANDING. INVESTIGATION SHOWED THAT FUEL CONTAMINATION HAD COLLAPSED THE FUEL NOZZLE SCREEN SEVERELY RESTRICTING FUEL FLOW TO ENGINE. THE FUEL FILTER WAS COMPLETELY PLUGGED AND IN BYPASS. THE PILOT RSDR 97ZZZX955Nozzle · screen failedHELICOPTER TAKEOFF, CLIMB TO 50 FEET AGL. ENG LOST POWER, INITIATED EMERGENCY LANDING. (CRASH). AIRCRAFT SUBSTANTIALLY DAMAGED. NO INJURIES. FOUND FUEL NOZZLE INLET SCREEN COLLAPSED CAUSING SUBSEQUENT LOSS OF FUEL FLOW TO TURBINE SECTION CAUSING LOSS OF PSDR ERAA97374Support · groovedP.T. SUPPORT WAS REPAIRED AND RETURNED TO ERA 12-12-96 . P.T. SUPPORT HAS GROOVE IN SEALING SURFACE FOR LARGE "U" RING.SDR 97ZZZX1281Rear Support · crackedCOMPRESSOR WAS REMOVED FOR LOW POWER AND UPON PRELIMINARY INSPECTION, FOUND CRACKING OF REAR SUPPORT. AT APPROXIMATELY 1-5 INCHES OUT FROM BEARING BORE, FOUND CRACKING FROM 220 DEGREES - 260 DEGREES AROUND ON REAR SUPPORT.SDR HEEA978817Spline Adapter · below specRECEIVING INSPECTION REVEALED: EXTERNAL SPLINES BELOW MANUFACTURERS SPECS ON ADAPTER. INSTALLED A NEW ADAPTER.SDR HEEA978819Nozzle · defectiveENGINE REMOVED DUE TO 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED: EXCESSIVE RUNOUT BEYOND SERVICEABLE LIMITS ON #2 NOZZLE 1ST STAGE (.009) AND 2ND STAGE (.006) TIP PATHS. CRACKED BETWEEN DIAPHRAGM AND INNER BAND AS MARKED. INSTALLED A DALLSDR 97ZZZX541Turbine · crackedDURING REPLACMENT OF THE NR 1 NOZZLE, A CRACK WAS FOUND IN THE P/T SUPPORT BODY JUST AFT OF THE 6 AND 7 BEARING. SUMP BOSS UNIT WAS SENT IN FOR REWORK.SDR AU970150Starter Gen · faulty(AUS) STARTER/GENERATOR HAD EXCESSIVE ARMATURE BALANCE BAND GRINDING TO ACHIEVE BALANCE - PERSONNEL/MAINTENANCE ERROR - UNAPPROVED REPAIRSDR HEEA968774Wheel · blades errodedENGINE REMOVED DUE TO CYCLED #1 AND #2 WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED: (1) ERODED ALL LEADING EDGE AND SULPHIDATION ON 17 OF THE #1 WHEEL BLADES (2) ERODED LEADING EDGE 11 AND BURNT TRAILING EDGE ON 7 OF THE #1 NOZZLE VANES. PARTS SENT TO SDR HEEA968775Nozzle Vames · burntENGINE REMOVED DUE TO CYCLED NR 1 AND NR 2 WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED: (1) ERODED ALL LEADING EDGE AND SULPHIDATION ON 17 OF THE NR 1 WHEEL BLADES. (2) ERODED LEADING EDGE 11 AND BURNT TRAILING EDGE ON 7 OF THE NR 1 NOZZLE VANES. PARTS SSDR CA970421057Valve Anti Ice · cracked(CAN) ANTI-ICE VALVE GUIDE ASSY CRACKED ALLOWING THE GUIDE ASSY LEVER SUPPORT TO SEPERATE FROM THE VALVE ASSY B-NUT. REPLACED.SDR 97ZZZX203Bearing · spalledPILOT HAD JUST RUN THE ENGINE UP TO FLIGHT IDLE IN PREPARATION FOR TAKEOFF WHEN THE ENGINE CHIP LIGHT ILLUMINATED. A LARGE CHIP .0937 INCH BY .0625 INCH WAS FOUND ON THE UPPER CHIP PLUG AND SUBSEQUENT INSPECTION FOUND 2 ROLLERS WITH DEEPLY SPALLED AREAS ON THSDR CA970528020Fuel Control · loose(CAN) GROUND IDLE RPM DROPPED TO 57 PERCENT N1 IDLE SPEED. ADJUSTMENT SCREW FOUND TO BE EASY TO ROTATE BY HAND. NO BUILT IN FRICTION FELT. REASON FOR LAST REMOVAL. REPLACED.SDR CA970528021Bypass Valve · stuck(CAN) UNABLE TO ADJUST START CYCLE COMPRESSOR STALLING AND FAST EXCELLERATION OF N1 RPM NOTED AT 20 PER N1 FUEL PRESSURE WAS NOTED AS HIGH AS +30 PSI. POSSIBLE BYPASS VALVE STUCK OPEN. REPLACED.SDR CA970311068Rear Strut · cracked(CAN) LOOSE INNER FITTING, WORKING RIVETS AND CRACKED AROUND LOWER HOLE OF LANDING GEAR DRAG BRACE HOLE.SDR 97ZZZX202Case Half · crackedDURING ANNUAL INSPECTION THE ENG COMPRESSOR CASE HALVES WERE INSPECTED AND FOUND TO BE CRACKED AND LIFTING. REPLACED CASE HALVES.SDR CA970225001Swashplate · bearing failed(CAN) DURING DAILY INSPECTION THE AME NOTICED BLACK GREASE COMING FROM BOTTOM SURFACE OF SWASHPLATE. SWASHPLATE REGREASED AND AIRCRAFT RETURNED TO SERVICE. APPROXIMATELY 1.5 HOURS INTO FLIGHT A 'HOWLING' NOISE HEARD. AME FOUND EXCESSIVE BLACK GREASE IN SAME ARSDR HEEA968732Fuel Pump · malfunctionFUEL PUMP FAULTY. ALSO CHANGED FILTERSDR ERAA96365Governor · stiffGOVERNOR REM'D FROM 296EH 10/28/96 AND SENT FOR REPAIR; REC'D BACK AT ERA 12-12-96 AND WAS REJECTED BECAUSE OF GOVERNOR ARM BEING STIFF.SDR HEEA968685Linear Actuator · faultyINSPECTED BY ACCESSORY OVERHAUL SHOP AND FOUND ACTUATOR RETRACTED VERY SLOW AND INTERMITTENTLY. FOUND VENDOR REPAIRED MOTOR WAS DEFECTIVE.SDR 97ZZZX908Switch · inoperativeAIRCRAFT SUSTAINED MAJOR DAMAGE WHEN FUEL NOZZLE SCREEN BECAME CLOGGED AND COLLAPSED CAUSING LOSS OF POWER. POST ACCIDENT INVESTIGATION BY MCDONNEL DOUGLAS AND FAA FOUND FUEL FILTER BYPASS SWITCH WAS NOT CLOSING SO PILOT HAD NO INDICATION THAT THE FUEL FILTERSDR ERAA96362Bearing · galledROLLERS ARE GALLED & GROOVED.SDR HEEA968648Gearbox Cover · leakingENGINE REMOVED DUE TO AFT TORQUE METER LEAK. UPON INSPECTION OF GEARBOX PARTS NOTED: TM BORE TO BUSHING HAS A LINE TO LINE FIT ON COVER ASSEMBLY. INSTALLED A PHI REWORKED GEARBOX COVER.SDR HEEA968649Nozzle · out of limitsTURBINE REMOVED DUE TO 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED: GROOVED AND EXCESSIVE RUNOUT BEYOND SERVICEABLE LIMITS ON #4 NOZZLE 3RD STAGE TIP PATH (T/R .0055) AND 4TH STAGE TIP PATH (T/R .005) MAX ALLOWABLE TIP PATH RUNOUT.004. INSTSDR CA970421058Compressor · leaking(CAN) COMPRESSOR DISCHARGE AIR LEAKING BETWEEN COMPRESSOR SCROLL DISCHARGE AND STEEL INSERTS. PART TC: 1,665.SDR HEEA968616Gearbox Cover · defectiveUPON INSTALLATION OF STUD NOTED: 12:00 HELICOIL INSTALLED AT AN ANGLE ON GEARBOX COVER. TIME SINCE REPAIR 0:00.SDR HEEA968613Tube Assy. · failed checkENGINE REMOVED DUE TO COMPRESSOR OVERHAUL. GEARBOX REPAIRED DUE TO WORN COMPRESSOR BORE. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: TUBE ASSEMBLY FAILED DIMENSIONAL CHECK PER CEB1307. INSTALLED A NEW TUBE.SDR HEEA968599Tube Assy · fail checkENGINE REMOVED DUE TO IN FLIGHT FAILURE. UPON INSPECTION OF GEARBOX PART NOTED: TUBE ASSEMBLY FAILED DIMENSIONAL CHECK PER CEB1307. INSTALLED A NEW TUBE ASSEMBLY.SDR HEEA968586Wheel · failedENGINE REMOVED DUE TO TURBINE WHEEL FAILURE. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: #1 WHEEL EXHIBITS A RIM FAILURE. CRACK ORIGINATED AT RIM AND PROGRESSED ON THE LEADING EDGE SIDE 3/8" UNTIL OVERLOAD, PROGRESSING AROUND A1/16" X 1/4" CASTINGSDR HEEA968587Wheel · defectiveENGINE REMOVED DUE TO COMPRESSOR OVERHAUL. PERFORMED HOT END INSPECTION ON TURBINE DUE TO COMPRESSOR FOD. UPON INSPECTION OF TURBINE NOTED MINOR SULFIDATION ON ALL #1 WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR HEEA968536Scroll Assy · mis repairedRECEIVING INSPECTION REVEALED: REPAIR TO SCROLL ASSEMBLY ANTI-ICE PORT NOT FULLY WELDED AS MARKED AND DIMENSION FROM ANTI-ICE PORT TO SPLIT LINE MEASURES .080 ABOVE BLUE PRINT SPECS (2.225)SDR HEEA968537Nozzle · crackedENGINE REMOVED DUE TO AFT T/M LEAKS. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST RUN. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED AND BOWED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES. INSTALLED A STANDARD AERO OVERHAULED #1 NOZZLE.SDR 97ZZZX118Tie Bolt · failedIN PROCESS OF REPAIRING A C20B TURBINE, FOR UNUSUAL NOISE AND CHIP LIGHT, FOUND GP TIE BOLT SN DJ 59 BROKEN APPROXIMATELY .6250 INCH BELOW SPANNER NUT ON NR 1 WHEEL SIDE. CANNOT READ THE COMPLETE SERIAL NUMBER AS IT IS COVERED WITH CARBON. CROSS SECTION OF TSDR 97ZZZX90Turbine Wheel · failureROTORCRAFT SUFFERED AN UNCONTAINED TURBINE FAILURE CAUSING DAMAGE TO AIRCRAFT. NR 2 ENG FAILED AND TURBINE WHEEL ENTERED TAILBOOM TUNNEL CAUSING A 9 INCH TEAR IN CENTER OF FIRE WALL. HIT NR 1 T/R DRIVESHAFT HANGER BEARING SUPPORT, RIPPED MOUNTING. WHEEL THESDR HEEA968474Tube Assy. · out of specENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING:TUBE FAILED DIMENSIONAL CHECK PER CEB 1307. INSTALLED A NEW PART.SDR HEEA968475Tube Assy. · out of specENGINE REMOVED DUE TO AFT T/M LEAKS. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: TUBE FAILED DIMENSIONAL CHECK PER CEB 1307. INSTALLED NEW TUBE.SDR HEEA968476Tube Assy. · out of specENGINE REMOVED DUE TO MAKING METAL. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: TUBE FAILED DIMENSIONAL CHECK PER CEB 1307. INSTALLED NEW TUBE.SDR HEEA968477Coupling · failed inspTURBINE REMOVED DUE TO 1750 HOUR INSPECTION DUE. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: FAILED NO-GO GUAGE INSPECTION ON N1 COUPLING INTERNAL SPLINES. INSTALLED NEW PART.SDR HEEA968480Wheel · defectiveTURBINE REMOVED DUE TO 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR 97ZZZX2707Thrust Plate · wornTURBINE WAS GENERATING METAL. FOUND THE BEARING CLAMPING SURFACE OF THE THRUST PLATE WORN DUE TO SPINNING OF THE NR 8 BEARING OUTER RACE. FRETTING ON THE OPPOSITE SIDE OF THE THRUST PLATE INDICATED THERE MAY HAVE BEEN INSUFFICIENT TORQUE ON THE NR 8 BEARING SDR CA970311059Blower · bearing failure(CAN) LOUD BANG AND HEAVY VIBRATION. LIGHT SMOKE IN COCKPIT. SUSPECT BEARING FAILURE OF OIL COOLER BLOWER.
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