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 AGQA065561Bleed Valve · stickingBLEED VALVE STICKING CAUSING COMPRESSOR STALLS.SDR AGQA065562Governor · slowGOVERNOR SLOW TO RECOVER.SDR AGQA065546Bleed Valve · failedBLEED VALVE PRODUCES LOW POWER- HIGH N1 SPEED.SDR AU000977Drive Shaft · failed(AUS) ENGINE TO TRANSMISSION DRIVE SHAFT FAILED AND SEPARATED AT THE TRANSMISSION END. SUSPECT ATTACHMENT NUTS PN MS21043-4 HAD NOT BEEN CORRECTLY RETORQUED (LEFT FINGER TIGHT) FOLLOWING SERVICING AND GREASING OF THE SHAFT APPROXIMATELY ONE HOUR PREVIOUSLY. TSDR HEEA065437Nozzle · brokenENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED A 1 PIECE OF NOZZLE SHIELD DOME BROKEN OUT AND LODGED AGAINST NR 1 NOZZLE VANES.SDR HEEA065438Blade · damagedENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED NR 1 WHEEL BLADES DAMAGED DUE TO FAILED NR 1 NOZZLE SHIELD DOME.SDR HEEA065439Nozzle Shield · brokenENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED A 1 PIECE OF DOME BROKEN OUT OF NR 1 NOZZLE SHIELD AND LODGED AGAINST NR 1 NOZZLE VANES.SDR CA991229020Nozzle · contaminated(CAN) N2 BLEED OFF EXPERIENCED WHEN POWER REQUESTED. FUEL NOZZEL REMOVED AND FOUND TO HAVE CARBON BUILD-UP. NOZZEL SENT FOR O/H.SDR ERAA065428Bearing · flakingMETAL FLAKING OFF OF ROLLER.SDR ERAA065429Bearing · scratchedNEW BEARING COULD NOT BE INSTALLED ON AIRCRAFT DUE TO HAVING SCRATCHED ROLLER.SDR HEEA065301Nozzle · crackedENGINE REMOVED DUE TO EXCESSIVE OIL CONSUMPTION (1 QUART PER MINUTE). UPON INSPECTION OF TURBINE PARTS NOTED VANES CRACKED AND ERODED MAR-M COATING.SDR 20000406SH037Actuator · malfunctionedPRIOR TO INSTALLATION, PERFORMED OPS CHECK, BLOWN CIRCUIT BREAKER. REMOVED AND REPLACED. (X)SDR CA991229031Sprag Clutch · broken(CAN) DURING 300 HOUR INSPECTION OF THE O/R CLUTCH ASSY, THE SPRAG ASSY (S/N 5433) WAS FOUND TO HAVE A PIECE OF ONE OF THE SPAGS BROKEN OFF. THE PIECE WAS APPRX 1/4 X 1/4 INCH AND CAME FROM THE INSIDE DIAMETER OF THE SPRAG CLUTCH.SDR CA991208092Bearing · wrong part(CAN) AMO RECEIVED SG AND FOUND THE A.D.E. BEARING TO BE NOISY AND ROUGH AND ALSO UNAPPROVED. PROPER OEM BEARINGS INSTALLED P/N 03-6009-23. ARMATURE WAS THEN RESURFACED, BALANCED AND BRUSHES WERE SEATED. UNAPPROVED BEARINGS WERE QUARANTINED.SDR 20000622SH005Line · looseNR 2 ENGINE DECELERATED DURING FLIGHT. ENGINE WAS SHUT DOWN AND A SINGLE ENGINE LANDING WAS MADE. UPON INVESTIGATION BY MAINTENANCE, THE PR LINE AT THE GOVERNOR WAS EXTREMELY LOOSE. TIGHTENED B-NUT AND ENGINE PERFORMED SATISFACTORY DURING POST RUN-UP. GOVERSDR HEEA065243Wheel · damagedTURBINE WAS REMOVED DUE TO 1ST, 2ND, AND 3RD STAGE WHEELS CYCLED. RECEIVING ASSEMBLY INSPECTION REVEALED EXCESSIVE RUNOUT OF OUTER BAND AND WAS UNABLE TO BALANCE 4TH STAGE WHEEL. INSTALLED NEW PART.SDR HEEA065212Indicator · contaminatedFUEL QUANTITY INDICATOR HAD OIL BETWEEN THE GLASS.SDR HEEA065215Exciter · inoperativeEXCITER INOPERATIVE.SDR HEEA065190Nozzle Shield · crackedENGINE REMOVED DUE TO EXCESSIVE OIL CONSUMPTION (1 QUART PER MINUTE). UPON INSPECTION OF TURBINE PARTS NOTED DOME CRACKED FROM 3 O'CLOCK TO 7 O'CLOCK POSITION ATTACHING BRAZEMENT CAUSING COKING OF NR 8 BEARING AREA.SDR CA991209007Bleed Valve · failed(CAN) COMPRESSOR STALLS WHEN POWER APPLIED AT ALT.SDR ERAA065407Engine · making metalENGINE MAKING METAL (2 1/2 BEARING FAILURE)SDR ERAA065408Gear · spalledENGINE MAKING METAL. GEARBOX PINION GEAR AND TORQUE METER GEAR TEETH SPALLING AND PITTING.SDR ERAA065409Bearing · failedENGINE MAKING METAL; 2 1/2 BEARING FAILED, MINOR FOD 1ST STAGE COMPRESSOR.SDR ERAA065410Bearing · failedENGINE MAKING METAL; NR 5 BEARING FAILED, SCROLL CRACKED AT TOP ECU FITTING.SDR 2000ZZZX152Combustion Case · crackedPILOTS REPORTED LOW POWER AND HIGH TOT. TROUBLESHOOTING FOUND A LARGE CRACK IN THE ARM PIT AREA WHERE IT IS REINFORCED WITH A BRAZED ON SCREEN, RIGHT SIDE. PART REMOVED AND SENT IN FOR POSSIBLE REPAIR. POSSIBLE CAUSE, METAL FATIGUE.SDR HEEA064985Carbon Seal · leakingENGINE REMOVED DUE TO METAL IN OIL. FAILED LEAK CHECK, I/A/W 10W2 OPERATION AND MAINTENANCE MANUAL 6TH ED. REV. 3 DATED 7-15-99 SECTION 72-30-00 PARA. 3/B/12. INSTALLED NEW REPLACEMENT NR 1 SEAL.SDR HEEA064981Case Halve · chafedCASE HALVES RUBBED ON PLASTIC DURING POWER CHECK ON AIRCRAFT. UNBONDED PLASTIC NOTED UPON INSPECTION OF COMPRESSOR PARTS.SDR HEEA064917Adapter · mismarkedNEW PART RECEIVING INSPECTION REVEALED WRONG PART NUMBER ETCHED ON PART.SDR HEEA064918Tie Bolt · mismanufacturedUPON INSPECTION OF NEW NEVER INSTALLED PART FREE LENGTH OVER BP SPECS ON TIEBOLT. INSTALLED NEW PART.SDR HEEA064919Tie Bolt · mismanufacturedUPON INSPECTION OF NEW NEVER INSTALLED PART FREE LENGTH OVER BP SPECS ON TIEBOLT. INSTALLED NEW PART.SDR HEEA064920Carbon Seal · leakingASSEMBLY INSPECTION REVEALED CARBON SEAL LEAKED ON PRESSURE TEST.SDR HEEA064906Nozzle · crackedENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED AND MISSING COATING OUT OF SERVICEABLE LIMITS ON NR 1 NOZZLE VANES.SDR HEEA064908Nozzle · crackedENGINE REMOVED DUE TO BLOWING OIL OUT OF EXHAUST STACK AND SMOKING BADLY. INSPECTION OF TURBINE PARTS REVEALED CRACKED VANES.SDR HEEA064909Nozzle Shield · detachedENGINE REMOVED DUE TO BLOWING OIL OUT OF EXHAUST STACK AND SMOKING BADLY. TEARDOWN INSPECTION REVEALED NR 1 NOZZLE SHIELD DOME DETACHED, NR 8 BEARING AREA EXPOSED TO EXCESSIVE HEAT CAUSING COKING AND SCAVENGE PORT BLOCKAGE FORCING OIL ACROSS 35-37 SEAL AND OISDR HEEA064910Nozzle Shield · detachedENGINE REMOVED DUE TO BLOWING OIL OUT OF EXHAUST STACK AND SMOKING BADLY. TEARDOWN INSPECTION REVEALED NR 1 NOZZLE SHIELD DOME DETACHED, NR 8 BEARING AREA EXPOSED TO EXCESSIVE HEAT CAUSING COKING AND SCAVENGE PORT BLOCKAGE FORCING OIL ACROSS 35-37 SEAL AND OISDR HEEA064911Nozzle Shield · detachedENGINE REMOVED DUE TO BLOWING OIL OUT OF EXHAUST STACK AND SMOKING BADLY. TEARDOWN INSPECTION REVEALED NR 1 NOZZLE SHIELD DOME DETACHED, NR 8 BEARING AREA EXPOSED TO EXCESSIVE HEAT CAUSING COKING AND SCAVENGE PORT BLOCKAGE FORCING OIL ACROSS 35-37 SEAL AND OISDR 99ZZZX4588Rotor · crackedUPON VISUAL INSPECTION OF THE POWER TURBINE SECTION WHEN REMOVED FOR 10W POWER REPAIR. DISASSEMBLED P.T. ROTOR AND FOUND CRACKED DIAPHRAGM THROUGH NR 4 NOZZLE INNER BAND. POSSIBLE CAUSE IS DUE TO NOZZLE UNABLE TO HANDLE STRESS FROM HEAT. NOTE: THIS DIAPHRASDR CA991103028Spring · cracked(CAN) SPRING COIL (DAMPER) CRACKED APPROXIMATELY HALF WAY THROUGH WIRE.SDR 99ZZZX4404Combust Case · crackedPILOTS REPORTED LOW POWER AND HIGH TOT. TROUBLESHOOTING FOUND A LARGE CRACK (APPROX 3 INCHES LONG) IN THE ARM PIT AREA WHERE IT IS REINFORCED WITH A BRAZED ON SCREEN, RIGHT HAND SIDE. PART REMOVED AND SENT IN FOR POSSIBLE REPAIR. SUBMITTER STATED CAUSE IS POSDR ERAA065400Seal · softPT SUPPORT OVERHAULED AND RETURNED 2-16-99. ISSUED TO AIRCRAFT BUT COULD NOT BE INSTALLED DUE TO SOFT 19-24 SEAL.SDR CA991229051Bolt · loose(CAN) BOLT FOR THE FWD T/R DRIVESHAFT COUPLING WAS FOUND LOOSE. BOLT REPLACED.SDR CA991103019Bracket · failed(CAN) DURING ROUTINE INPSPECTION (UNDER THE FRONT MIDDLE SEAT), THE BEARING CAP WAS FOUND BROKEN ON THE FORWARD SIDE ON THE COLLECTIVE/CYCLIC ASSEMBLY.SDR CA991209006Shaft · sheared(CAN) TACHOMETER/GENERATOR SHAFT SHEARED, CAUSING THE ENGINE OUT WARNING SYSTEM TO COME ON DURING THE TAKEOFF ROLL.SDR CA991028058Fitting · cracked(CAN) LEFT UPPER TAIL BOOM/FUSELAGE ATTACHMENT FITTING FOUND CRACKED DURING A CAMPAIGN NOTICE (DATED OCT 12/99).SDR CA991028066Angle · cracked(CAN) DURING SCHEDULED INSPECTION OF SKID GEAR, A CRACKED ANGLE WAS FOUND ON THE LEFT AFT SKID TUBE. SUBMMITTER SUSPECTED CRACK WAS CAUSED BY NORMAL IN-SERVICE OPERATIONS, HOWEVER, SERIOUS DAMAGE COULD HAVE OCCURRED IF BEAR PAW HAD DEPARTED SKIDS DURING FLYINSDR HEEA064787Seal · damagedENGINE REMOVED DUE TO HIGH OIL CONSUMPTION, 5 QUARTS PER FLIGHT HOUR. INSPECTION OF TURBINE PARTS REVEALED EXCESSIVELY GROOVED AND FLAKING INTERNAL SUMP SEALS.SDR CA000110004Bearing · making metal(CAN) INPUT ALIGNMENT BEARING MAKING METAL. (CHIP LITE IN CRUISE). GEARBOX STRIPPED TO DETERMINE CAUSE OF FAILURE.SDR ERAA064511Stud · brokenVANE RING SENT FOR OVERHAUL 8/30/99. VANE RING ISSUED TO AIRCRAFT, BUT COULD NOT BE USED BECAUSE STUD BROKE AT LESS THAN 30 INCHES/POUNDS TORQUE. ALSO NOTED: EXCESS SLAG AROUND STUDS. WILL NOT ALLOW PROPER SEATING.SDR AU990997Stator · failed(AUS) COMPRESSOR SECOND STAGE STATOR VANE FAILED AND ENTERED THE THIRDSTAGE COMPRESSOR ROTOR CAUSING SIGNIFICANT IMPACT DAMAGE TO THE THIRD STAGE ROTOR AND FURTHER DOWNSTREAM STAGES.SDR AU991011Case · failed(AUS) COMPRESSOR CASE DAMAGED IN THE AREA OF THE THIRD AND FOURTH STAGE OF THE COMPRESSOR DUE TO STATOR FAILURE.
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