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 CA020321001Engine · fod(CAN) UNUSUAL SOUND HEARD FROM THE A/C ON COOL DOWN COMING FROM THE ENGINE INLET AREA. UPON FURTHER INVESTIGATION THE COMPRESSOR HAD FOD. A NUTPLATE ON THE FORWARD SIDE OF THE PARTICLE SEPERATOR, THAT FASTEN THE FOWARD INLET COWLS ON, HAD SPLIT AND HALF OF THESDR HEEA077556Compressor · failedON SECOND FLIGHT OF THE DAY, IN CRUISE, THE AIRCRAFT YAWED FOLLOWING WITH GENERATOR LIGHT ON, AUDIO ON, DECLINE OF N2, N1 AND OIL PRESSURE ON NR 1 ENGINE. SECURED NR 1 ENGINE. MAINTENANCE FOUND NR 1 COMPRESSOR FAILURE.SDR HEEA077558Compressor · failedENGINE REMOVED DUE TO IN FLIGHT COMPRESSOR DAMAGE. UPON INSPECTION OF COMPRESSOR PARTS NOTED WIPE OUT OF 2ND THRU 5TH STAGE COMPRESSOR WHEEL BLADES, EXCESSIVE FOD TO CASE HALF ASSY, 1ST THRU 6TH STAGE WHEELS, IMPELLER AND TURBINE. SUSPECTED CAUSE IS 2ND STAGSDR CA020114002Pitch Link · cracked(CAN) FOUR CRACKS FOUND TWO ON EACH END OF PITCH LINK SIMILAR TO THOSE DESCRIBED IN ASB 206-87-39 AND OSN 206-99-36.SDR CA020125002Bearing · cracked(CAN) THIS AIRCRAFT RUNNING NORMAL. PILOT ON START HEARD A LOUD SQUEELING NOISE, THEN GOT A CHIP LITE. MAINTENANCE FOUND HUGE AMOUNTS OF METAL ON BOTH PLUGS. PROBLEM FOUND TO BE 2 1/2 BEARING FAILURE. 2 1/2 BEARNING ON SPUR ADAPTER, REPLACED. PROBLEM SEEMS TO SDR PN12002F00000Combust Chamber · crackedDURING AIRCRAFT 100 HOUR INSPECTION FOUND THE RIGHT ARMPIT OF THE COMBUSTION CAN CRACKED.SDR CA011207002Tube · chafed(CAN) DRAIN LINE CHAFING ON FUEL CONTROL TO FUEL PUMP BY PASS TUBE IS 99 PERCENT CHAFED.SDR CA011211001Drain Line · chafed(CAN) DRAIN LINE CHAFING ON FUEL CONTROL TO FUEL PUMP BYPASS TUBE P/N 6859172 TUBE IS 99 PERCENT CHAFED.SDR ERAA077515Plug · dislodgedENGINE IS MAKING METAL. RESI-WELD FE 186 SEALANT PLUG DISLODGED FROM COMPRESSOR MOUNT. SEALANT PLUG LODGED IN OIL PUMP SCAVENGE PORT. THIS DID NOT LET THE OIL SCAVENGE, THUS LETTING THE BEARINGS STARVE FOR OIL CAUSING IT TO MAKE METAL. ACTION TAKEN: DISASSSDR CA011203005Bearing · peeling(CAN) BOTH THE PLANETARY AXLE AND ROLLER BEARING PLATING PEELING.SDR DFM2001F00000Switch · intermittent25 MINUTES INTO REPOSITIONING FLIGHT NR 1 ENGINE N1 DECREASED SLOWLY. ATTEMPT TO REGAIN OPERATING NR 1 UNSUCCESSFUL. PILOT INITIATED SINGLE ENGINE PROCEDURES TO A SUCCESSFUL SINGLE ENGINE LANDING. NO AIRCRAFT DAMAGE, NO PERSONAL INJURIES. TROUBLESHOOTING TSDR CA020103001Bearing · spalled(CAN) GEARBOX RECEIVED FROM THE USA FOR INVESTIGATION OF METAL CONTAMINATION. UPON DISASSEMBLY THE SUBJECT BEARING SHOWS SIGNS OF EXCESSIVE PEELING ON ONE BALL, 75 PERCENT OF AREA AFFECTED. ANOTHER BALL ALSO STARTING TO PEEL. ONE HALF OF SPLIT INNER RACE HAD SDR CA011210010Drive Shaft · damaged(CAN) PILOT REPORTED IN NORMAL LEVEL CRUISE FLIGHT AT LOW TO MEDIUM TORQUE SETTING. HE FELT, HEARD AND NOTICED A POWER SURGE AND GAUGE FLUCTUATION APPROX. 2 PERCENT N1. THIS WOULD OCCUR FOR JUST A SECOND AND WOULD ONLY OCCASIONALLY HAPPEN 1 TIME OR SEVEERAL TISDR CA020405026Governor · inoperative(CAN) GOVERNOR WILL NOT HOLD 100 PERCENT IN FLIGHT.SDR CA011126001Bearing · damaged(CAN) OUTER AND INNER RACE OF BEARING DISPLAY MODERATE PITTING AND PEELING.ONE BALL DISPLAYS HEAVY PITTINGSDR ERAA077294Engine · making metalENGINE IS MAKING METAL, BOTH PLUGS. FC-OP GEARSHAFT DAMAGED PN 6896437 ACTION TAKEN: INSTALLED NEW GEARSHAFT & COMPLIED WITH CEB-A-1386 TQ METER GEAR INSPECTION .SDR CA011114017Bearing · defective(CAN) BOTH INNER AND OUTER RACE OF BEARING DISPLAYED MODERATE PITTING AND PEELINGSDR CA020405025Bulkhead · cracked(CAN) CRACK FOUND DURING INSPECTION IN AFT LT TAIL ROTOR GEARBOX MOUNTING AREA.SDR CA011127001Clutch · broken(CAN) FREEWHEEL UNIT SENT IN FOR REPAIR OWNER REPORTS: LEAKING AND ROUGH TO TURN ONCE REMOVED. FREEWHEEL DISASSEMBLED AND CLUTCH CAGE FOUND CRACKED AND A PIECE BROKEN OFF. THE INNER RACE AND OUTER RACE BOTH FOUND WORN BEYOND LIMITS. BELL HELICOPTER PRODUCT SUPSDR CA011121004Governor · failed(CAN) THE HELICOPTER WAS INVOLVED IN FOREST INVENTORY WORK AT LOW ALTITUDE AT NEAR GROSS WEIGHT AT SLOW SPEED WHEN PILOT NOTICED HIS ROTOR RPM DROPING, LOW ROTOR WARNING AND AN INDICATION OF 95 PERCENT. HE MANAGED TO DROP COLLECTIVE AND LAND IN A SMALL CLEARINSDR CA011114016Bearing · peeling(CAN) CHIP LIGHT INDICATION.GEARBOX DISASSEMBLED FOR INVESTIGATION.BEARING PLATING FOUND PEELING.REPLACED WITH NEWSDR CA011116011Gyro · shorted(CAN) ON FINAL FOR LANDING, PILOT AND PASSENGERS NOTICED AN ELECTRICAL SMELL, SECONDS LATER WHITE SMOKE FILLED THE CABIN COMING FROM BEHIND INSTRUMENT PANEL. ALL CIRCUIT BREAKERS WERE PULLED AND AIRCRAFT SHUT DOWN. INSPECTION REVEALED DIRECTIONAL GYRO HAD SHOSDR LS1R076731Filter · leakingENGINE OIL FILTER IS LEAKING.SDR CA011016002Sprag Clutch · chipped(CAN) ON 300 HOUR (SLING TIME OF 221.1 HOURS) INSPECTION THE SPRAG ASSEMBLY WAS FOUND TO HAVE ONE BROKE SPRAGSDR KUVA076138Bearing Race · chafedBEARING P/N 23034787 S/N MP78657 CHAFFED RACE P/N 6890483 S/N MP119218 CAUSING BOTH PARTS TO SCRAP.SDR ERAA076672Engine · making metalENGINE IS MAKING METAL. G.B. SN CAG-36092 PTO GEAR PITTED. ACTION TAKEN: INSTALLED SERVICEABLE GEAR BOX.SDR ERAA076673Engine · malfunctionedTURBINE RUNS HOT, LOW POWER. STRETCHED NR 1 BLADES. ACTION TAKEN: INSTALLED NEW NR 1 & 2 WHEEL & NR 2 NOZZLE.SDR ERAA076674Engine · making metalENGINE IS MAKING METAL. HAS METAL ON MAG PLUGS. 2 1/2 BEARING INNER RFACE HAS METAL. GROOVES ON SEVERAL ROLLERS. ACTION TAKEN: DISASSEMBL3D ENGINE CAE-836436, TURBINE, COMPRESSOR, GEARBOX. CHANGED 11/2 BEARING SN MR55741, INSTALLED MP75985, GEARSHAFT SN 6SDR CA011030007Shaft · failed(CAN) THIS TURBINE WAS RECD FOR ROUTINE SCHED MAINT. THERE WAS NO SERVICE COMPLAINT. ON DISASSY, TURBINE PT ROTOR NUT FOUND UNTHREADED FROM PT INNER SHAFT. SCORING EVIDENCE ON THE PT INNER SHAFT INDICATES NUT UNTHREADED DURING OP. NUT HAD BEEN STAKED AT 2 PLACSDR CA011105016Gearbox · making metal(CAN) ON ENGINE START UP - PILOT REPORTED MGB CHIP LIGHT ON, PULSED OFF AND 4 SECONDS LATER LIGHT BACK ON. ENGINE SHUT DOWN, MAG PLUG PULLED 2 SMALL FLAKED AND SOME FUZE ON PLUG. FINE OIL FILTER REMOVED AND FOUND TO BE CONTAMINATED WITH NUMEROUS, VARIOUS SIZEDSDR ERAA076655Governor · malfunctionedGOVERNOR OCCASIONALLY DROOPS IN FLIGHT. TEST RESULTS CONFIRM SNAG OF DROOP. UNIT WAS DOOPING BY 250 RPM @ T.P. 3.01 ECCENTRIC SHAFT FOUND CORRODED AND WORN BEYOND LIMITS ON LOBES. BEARINGS PN 2520503 AND 2523237 FOUND TO BE ROUGH AND DRY. ACTION TAKEN: ABOSDR ERAA076656Governor · malfunctionedNR 1 GOVERNOR IS SLOW,NR HIGH WITH REDUCED POWER. TEST RESULTS INDICATE GOVERNOR WAS DROOPING OFF SLIGHTLY (100 RPM) SEVERAL INTERNAL BEARINGS PN 2520503 & 2523237 FOUND DRY AND ROUGH. THROTTLE BUSHING WORN ALLOWING SHAFT TO HAVE EXCESSIVE PLAY. ECCENTRIC SSDR ERAA076657Governor · wornSPLINES ON DRIVESHAFT OF GOVERNOR IS WORN. MAX GOVERING DROOPS OFF 300 RPM TO EARLY. THROTTLE BUSHING VERY SLOPPY WORN SPLINES ON DRIVESHAFT AS WELL AS THE MATING FACE OF THE SPOOL BEARING EXHIBITED HEAVY WEAR FROM THE GOVERNOR WEIGHT FEET. ECCENTRIC SHAFT SDR EHA2001F00004Attach Fitting · crackedCRACK DISCOVERED IN TAIL ROTOR GEARBOX ATTACH CASTING PN 105-30402-100.12 PROGRESSING FROM UPPER LEFT CORNER THROUGH FIRST LOWER WEB (ABOVE UPPER LEFT BOLT HOLE) AND ENDING JUST PRIOR TO THE MAIN CENTER WEB. DISCREPANCY DISCOVERED AT THE 100 HOUR INSPECTION. SDR CA011012009Shaft · broken(CAN) GEARBOX RECEIVED FROM CUSTOMER WITH COMPLAINT OF T/R VIBRATION AND METAL GENERATION. ON STRIP DOWN THE OUTPUT GEARSHAFT WAS REMOVED AND THE OUTPUT JOURNAL AND THE END OF THE OUTPUT GEARSHAFT WERE FOUND INSIDE OF THE ALIGNMENT BEARING.THE OUTPUT GEARSHAFTSDR HEEA075928Nozzle · burnedBOLT BROKEN OFF IN NR 6 & 7 JET MOUNT. NR 1 NOZZLE VANES BURNED BEYOND REPAIRABLE LIMITS. OVERTEMP INSPECTION CW 2-23-00 FOR A 930 DEGREE EXCEEDANCE AND FOUND ACCEPTABLE. PART SCRAPPED. REPLACED WITH SERVICEABLE PART.SDR HEEA075929Turbine Wheel · damagedBOLT BROKEN OFF IN #6&7 JET MOUNT. WHEEL BLADES SULPHIDATED DUE TO OVERTEMP OF 930 DEGREES ON 2-23-00. PARTS WERE FOUND TO BE ACCEPTABLE WHEN INSPECTED FOR OVERTEMP. PART SCRAPPED. REPLACED WITH SERVICEABLE PART.SDR HEEA075930Turbine Wheel · damagedBOLT BROKEN OFF IN 6&7 JET MOUNT. WHEEL BLADES SULPHIDATED DUE TO OVERTEMP OF 930 DEGREES ON 2-23-00. PARTS WERE FOUND TO BE ACCEPTABLE WHEN INSPECTED FOR OVERTEMP. PART SCRAPPED. REPLACED WITH SERVICEABLE PART.SDR CA011011011Gearbox · making metal(CAN) PIC CALLED IN A MAGNETIC LITE ON. A/C LANDED AT SCHOOL. AME INSPECTED MAG PLUG, 1 SMALL FLAKE AND 1 THIN HAIR. A/C RUN UP CARRIED OUT NO FURTHER INDICATION. A/C FLOWN APPROX 8 MILES TO MIRIMICHI AIRPORT AND HOVERED AROUND RAMP AREA FOR APPROX 80 MINUTES.SDR CA010912018Gearbox · making metal(CAN) DURING A HELICOPTER ENGINE PERFORMANCE CHECK AT 2000 FT CRUISE, THE TAIL ROTOR GEARBOX CHIP LIGHT ILLUMINATED AND STAYED LIT. AFTER LANDING AT BASE, THERE WAS METAL FLAKES PRESENT ON CHIP DETECTOR. T/R GEARBOX WAS FLUSHED, CHIP DETECTOR CLEANED, & RE-INSSDR CA011003002Bearing · failed(CAN) INITIAL PROBLEM ENCOUNTERED WAS A CHANGE IN IDLE SPEED. IDLE WAS ADJUSTED, AIRCRAFT WAS TEST FLOWN & NBO PROBLEMS EXISTED.NEXT DAY AIRCRAFT IDLE SPEED HAD CHANGED. IDLE WAS ADJUSTED & RIGGING CHECKED. AIRCRAFT WAS RUN & TEST FLOWN. WHILE AIRCRAFT WAS RETSDR CA010830020Nozzle · warped(CAN) THERE WERE INTERMITTENT START DELAYS ON A/C AT VARIOUS TIMES DURING OPAL SORTIES. IT DETERMINED THAT POOR FITTING 1ST STAGE NOZZLE CAUSED START DELAY. TURBINE REPD WITH INST OF NEW 1ST STAGE NOZZLE P/N 23062753 S/N KD258711; NEW NOZZLE SHIELD P/N 230735SDR 2001F00599Blade · corrodedDURING DISASSEMBLY TO INSPECT FOR HIDDEN DAMAGE. SULFIDATION ON BACK SIDE OF BLADES. ENSURE PROPER APPLICATIONS OF COATING IS COMPLIED WITH. (M)SDR CA010907007Pin · sheared(CAN) WHILE CARRYING OUT HIS DAILY INSPECTION, THE PILOT NOTICED THE NUT LOOSE ON THE BLADE PIN UPON INSPECTION THE THREADED PORTION OF THE BLADE PIN WAS SHEARED.SDR CA010831010Main Rotor · cracked(CAN) 1 1/2"- 2" CHORDWISE CRACKS IN LOWER ROOT DOUBLER ADJACENT TO OUTBOARD END OF ROOT END FITTING. TWO BLADES FROM SAME SET WITH SIMILAR CRACKS S/N'S 009999-K068,-K070. *TORQUE EVENTS CALCULATED BY TSNX20 (REF: BOEING SERVICE BULLETIN SB 369D195R3)SDR 2001F00697Actuator · intermittentTHROTTLE TRIM LINK ACTUATOR, OPERATES INTERMITTENTLY. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (M)SDR HEEA075478Cover · crackedTURBINE REMOVED DUE TO NR 1 & 2 WHEEL CYCLES. UPON INSPECTION OF TURBINE NOTED NR 8 SUMP NUT BRAZEMENT ERODED AND CRACKED. SCRAPPED COVER AND REPLACED WITH SERVICEABLE PART.SDR 2001FA0000330Spline Adapter · failedENGINE SHUTDOWN DURING FLIGHT DUE TO FLAMEOUT. CAUSE: FAILURE OF SPLINED ADAPTER IN COMPRESSOR ASSEMBLY.SDR 2001F00565Engine · flamed outDURING POWER ASSURANCE CHECK, AT 1000 FEET AGL NR 1 ENGINE WAS PULLED OFFLINE. JUST POWER TO IDLE DETENT. NR 1 ENGINE FLAMED OUT. ATTEMPTED AIR START, ENGINE WOULD NOT START. AIRCRAFT WAS LANDED SINGLE ENGINE. AFTER THE LANDING, THE ENGINE WAS STARTED WISDR ALG2001F00023Engine · making metalENGINE CHIP LIGHT ILLUMINATED ON LANDING. FOUND LARGE FLAKE ON BOTTOM CHIP PLUG. REPLACED ENGINE ASSEMBLY.
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