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 99ZZZX4203Bearing · failedNR 6 AND NR 7 BEARINGS FAILED IN THE TURBINE. CAUSE UNKNOWN. FAILURE OCCURRED DURING NORMAL OPERATION. WHILE IN CRUISE FLIGHT, ENGINE CHIP LIGHT ILLUMINATED AND IMMEDIATE LANDING INITIATED.SDR 99ZZZX4204Bearing · failedNR 6 AND NR 7 BEARINGS FAILED IN THE TURBINE. CAUSE UNKNOWN. FAILURE OCCURRED DURING NORMAL OPERATION. WHILE IN CRUISE FLIGHT, ENGINE CHIP LIGHT ILLUMINATED AND IMMEDIATE LANDING INITIATED.SDR LS1R99107Switch · failedFUEL BYPASS CHECK. DID NOT MAKE CONTACT UNDER PRESSURE. REMOVED AND REPLACED. (X)SDR 99ZZZX4333Combustion Liner · crackedDURING REPLACEMENT OF TURBINE, THE COMBUSTION LINER WAS FOUND CRACKED AT THE EXPANSION SLOTS AT THE DOUBLE LIP AND THE FUEL NOZZLE FERRULE HAS A DEEP STEP WORN AT THE 6 O'CLOCK POSITION.SDR HEEA064646Seal · pittedRECEIVING INSPECTION REVEALED PITTED AND SCRATCHED SEAL FACE. INSTALLED NEW PART.SDR HEEA064647Bearing · scoredUPON INSPECTION OF PARTS, FOUND SCORING AND FROSTING OF NR 6 AND NR 7 BEARING ROLLERS. SERIAL NUMBERS REMOVED ARE MP44273 AND MP44026. INSTALLED NEW PARTS.SDR CA000110002Bearing · making metal(CAN) INPUT ALIGNMENT BEARING MAKING METAL (CHIP LITE IN FLIGHT). GEARBOX STRIPPED TO DETERMINE CAUSE OF METAL GENERATION.SDR CA991027045Bearing · damaged(CAN) PT GOVERNOR LEVER BEARINGS ARE DEVELOPING FLAT SPOTS INTERNALLY AND EXTERNALLY WHICH DIRECTLY AFFECTS GOVERNOR SPRING TENSION WHICH IN TURN THEN CAUSES THE GOVERNOR TO BLEED OFF EARLY. THE NET EFFECT IS DROOP.SDR CA991004035Fitting · cracked(CAN) UPPER LEFT TAILBOOM/FUSELAGE ATTACHMENT FITTING CRACKED AT FORWARD RIVET.SDR CA991027066Piston · worn(CAN) OIL PRESSURE REGULATOR WAS FOUND TO HAVE THE PISTON INSTALLED UPSIDE DOWN. UNIT WAS REPLACED BECAUSE OF INTERNAL WEAR.SDR HEEA064463Bearing · scoredENGINE REMOVED DUE TO TURBINE RUBBING. UPON INSPECTION OF PARTS NOTED: SCORING BEYOND O/H MANUAL LIMITS ON NR 6 AND NR 7 BEARING ROLLERS. SERIAL NUMBERS REMOVED ARE MP42920 AND MP42909. NEW PARTS INSTALLED.SDR HEEA064468Carbon Seal · leakingENGINE REMOVED FROM TEST CELL DUE TO LOW POWER. UPON REPAIR OF COMPRESSOR ASSY NOTED A LEAK IN CARBON SEAL ASSY DURING PRESSURE CHECK. NEW PART INSTALLED.SDR HEEA064389Tie Bolt · mismanufacturedTIE BOLT INSPECTION REVEALED FREE LENGTH OVER MAX LIMITS AT 6.888 INCHES.SDR HEEA064390Tie Bolt · mismanufacturedTIE BOLT INSPECTION REVEALED FREE LENGTH OVER MAX LIMITS AT 6.888 INCHES.SDR HEEA064392Gearshaft · spalledENGINE REMOVED DUE TO MAKING METAL. UPON INSPECTION OF GEARBOX NOTED THE FOLLOWING: SPALLING BEYOND SERVICEABLE LIMITS ON F/C O/P GEAR TEETH. INSTALLED NEW PART.SDR HEEA064393Seal · corrodedSEAL ASSEMBLY INSPECTION REVEALED PITTED MATING SURFACE.SDR HEEA064394Nozzle · crackedENGINE REMOVED DUE TO TURBINE RUBBING ON SHUTDOWN. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES.SDR HEEA064397Nozzle Shield · crackedTURBINE REPAIR DUE TO HIGH CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND REPAIRABLE LIMITS ON NR 1 NOZZLE SHIELD DOME. REPLACED WITH SERVICEABLE PARTS.SDR HEEA064379Carbon Seal · damagedENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: GROOVED BEYOND SERVICEABLE LIMITS ON CARBON SEAL ASSY TANGS AND SLOTS.SDR HEEA064380Spline Adapter · wornENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: FRETTING AND WORN BEYOND OVERHAUL MANUAL LIMITS ON SPLINE ADAPTER OUTSIDE DIAMETER AND RETAINING RING GROOVE. INSTALLED NEW PART.SDR HEEA064381Nozzle Shield · crackedENGINE REMOVED DUE TO TURBINE RUBBING ON SHUTDOWN. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED AND SEPARATED FROM INNER BAND BEYOND OVERHAUL MANUAL LIMITS ON NR 1 NOZZLE SHIELD DOME. INSTALLED NEW PART.SDR HEEA064382Tube · mismanufacturedFAILED DIMENSIONAL REQUIREMENTS OF CEB1307 ON OIL FILTER INLET TUBE ASSY. INSTALLED NEW PART.SDR CA000404011Pin · broken(CAN) M/R BLADE FOLDING PIN FOUND BROKEN DURING REMOVAL FOR 300 HOUR INSPECTION. ALL THE PINS WERE SUBSEQUENTLY REMOVED FOR INSPECTION.SDR CA991004058O-Ring · worn(CAN) FUEL PUMP NOISY ON SPOOL-UP AND SHUT DOWN.SDR CA991103012Oil Pump · seized(CAN) TRANSMISSION OIL PUMP HAD FAILED, FAILING TO LUBRICATE THE LOWER MAIN ROTOR TRANSMISSION RGB CAUSING IT TO SEIZE. TEAR DOWN TO FOLLOW.SDR 99ZZZX3805Governor · leakingUNIT HAS SAL SEALS. EXTERIOR OF UNIT IS SOOTY, FITTINGS ARE SLIGHTLY RUSTY. AN AS-RECEIVED TEST WAS PERFORMED WITH THE FOLLOWING RESULTS: AT GOVERNOR BREAK TEST POINT 3.010, PR-PG LEAKAGE WAS AT 7.8 INCHES OF HG WITH NO SPEED APPLIED. PR-PG LEAKAGE IS SUPPSDR CA991007035Governor · failed(CAN) GOVERNOR NOT MAINTAINING ROTOR RPM AND GRADUALLY DEGRADING. UNIT HAD ONLY BEEN INSTALLED FOR 53 HOURS. UNIT REPLACED.SDR CA991007040Nozzle · cracked(CAN) FUEL NOZZEL OUTER AIR SHROUD CRACKED WHEN RECEIVED FROM VENDOR.SDR CA991027080Gearbox · making metal(CAN) MAGNETIC CHIP PLUG WAS CONTAMINATED WITH FERROUS METAL FROM MAIN GEARBOX.SDR HEEA064376Gearshaft · spalledENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF GEARBOX PARTS NOTED: SPALLING ON FUEL CONTROL/OIL PUMP GEAR TEETH. INSTALLED NEW PARTS.SDR CA991027064Blower · failed(CAN) OIL COOLER BLOWER VIBRATING EXCESSIVELY AND ALSO SHOWED SIGNS OF GREASE LOSS.SDR 99ZZZX3858Bleed Valve · inoperativePILOT ENCOUNTERED NUMEROUS RAPID COMPRESSOR STALLS IN A HIGH POWER SITUATION. FOUND SIDE SLOP ON BLEED VALVE POPPET AND A RATCHETY FEEL DURING MANUAL ACTUATION. REPLACED BLEED VALVE.SDR CA990927053Governor · worn(CAN) GOVERNOR CIRCLIP EPOXY HAD DETERIORATED TO THE EXTENT THAT THE END DRIVE HAD FALLEN OFF ALLOWING THE CIRCLIP TO MOVE AND AND EVENTUALLY WEAR A GROOVE IN THE SHAFT WHICH ALLOWED THE CIRCLIP TO FALL OFF. AS SUCH, THERE WAS NO LOCKING DEVICE HOLDING THE ESDR CA991027065Indicator · inaccurate(CAN) 16 PERCENT TACH NEEDLE SPLIT AT THE HIGH END OF THE RANGE.SDR CA991229049Indicator · inaccurate(CAN) TOT GUAGE READS INACCURATELY. UNIT REPLACED.SDR ERAA064362Case Half · delaminatingCASE HALF OVERHAULED 7/98. CASE HAS 326.3 HOURS SINCE O/H AND PLASTIC IS DELAMINATING ON SIDE.SDR ERAA064363Carbon Seal · leakingNEW PART ISSUED TO AIRCRAFT, BUT COULD NOT BE INSTALLED DUE TO SEAL LEAKING DURING LEAK TEST.SDR CA991027052Bearing · failed(CAN) SUSPECT FAILURE OF ELASTOMETRIC FORK/HINGE BEARING AS T/R WAS DIFFICULT TO BALANCE.SDR 99ZZZX3534Bleed Valve · malfunctionewdENGINE HAD LOW POWER DETERMINED THAT THE BLEED VALVE WAS NOT FULLY CLOSING. REMOVED AND REPLACED.SDR 99ZZZX3543Bleed Valve · malfunctionedENGINE HAD LOW POWER. DETERMINED THE BLEED VALVE WAS NOT CLOSING. REMOVED AND REPLACED.SDR HEEA063855Nozzle · crackedENGINE REMOVED DUE TO 3,500 HOUR OVERHAUL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED VANES ON NR 1 NOZZLE. INSTALLED NEW PART.SDR HEEA063856Nozzle Shield · crackedENGINE REMOVED DUE TO N1 DRAG. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED DOME ON NR 1 NOZZLE SHIELD. INSTALLED NEW PART.SDR HEEA063857Nozzle Shield · crackedENGINE REMOVED DUE TO 1,750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED DOME ON NR 1 NOZZLE SHIELD. INSTALLED NEW PART.SDR CA990915053Leg · cracked(CAN) GEAR LEG ASSEMBLY TO BRACE ASSEMBLY CRACKED AT BOLT HOLE.SDR ERAA064356Support · misrepairedFRONT SUPPORT SENT FOR OVERHAUL, BUT COULD NOT BE INSTALLED DUE TO BEARING BORE OUT OF ALIGNMENT.SDR AU990883Gear · fractured(AUS) MAIN TRANSMISSION UPPER SPLINE GEAR TOOTH FRACTURED.SDR CA990916020Pump · noisy(CAN) GREASE WASHED OUT OF INTERNAL SPLINE OF THE FUEL PUMP.SDR 99ZZZX3559Fcu · malfunctionedFCU WOULD NOT ADJUST. REMOVED AND REPLACED.SDR ERAA064355Shaft · mismanufacturedNEW OUTER SHAFT HAS UNDERSIZE NR 5 BEARING JOURNAL.SDR 99ZZZX3519Governor · failedAFTER LEFT ENGINE START (NORMAL) AND WARM-UP, THROTTLE LEVER WAS MOVED TO FLIGHT IDLE. ENGINE WENT TO 90 PERCENT TORQUE WITH A ROTOR RPM OF 110 PERCENT. N1 AND N2 SPEEDS WERE ERRATIC. ENGINE SHUT DOWN. PR LINE ISOLATED FROM GOVERNOR TO FUEL CONTROL. FUEL
Back to Allison 250-C20B