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.

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 THEFeb 12, 2002 · Hughes 369D · Turbine Engine Air Inlet SectionSDR 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.Jan 16, 2002 · N7136H · Bolkms BO105S · Turbine Engine Compressor SectionSDR 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 STAGJan 16, 2002 · N7136H · Bolkms BO105S · Turbine Engine Compressor SectionSDR 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.Jan 8, 2002 · Bell 206B · Tail Rotor Control SystemSDR 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 Jan 4, 2002 · Bell 206B · Turbine Engine Reduction GearSDR PN12002F00000Combust Chamber · crackedDURING AIRCRAFT 100 HOUR INSPECTION FOUND THE RIGHT ARMPIT OF THE COMBUSTION CAN CRACKED.Dec 7, 2001 · N193P · Bell 206B · Turbine Engine Combustion SectionSDR CA011207002Tube · chafed(CAN) DRAIN LINE CHAFING ON FUEL CONTROL TO FUEL PUMP BY PASS TUBE IS 99 PERCENT CHAFED.Dec 7, 2001 · Bolkms BO105C · Engine DrainsSDR CA011211001Drain Line · chafed(CAN) DRAIN LINE CHAFING ON FUEL CONTROL TO FUEL PUMP BYPASS TUBE P/N 6859172 TUBE IS 99 PERCENT CHAFED.Dec 7, 2001 · Bolkms BO105C · Fuel Control/Turbine EnginesSDR 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: DISASSDec 4, 2001 · N423EH · Bolkms BO105A · Turbine Engine Compressor SectionSDR CA011203005Bearing · peeling(CAN) BOTH THE PLANETARY AXLE AND ROLLER BEARING PLATING PEELING.Dec 3, 2001 · Bolkms BO105CBS · Main Rotor GearboxSDR 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 TDec 2, 2001 · N692DD · Bolkms BO105C · Fuel Controlling SystemSDR 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 Dec 1, 2001 · Bolkms BO105CBS · Main Rotor GearboxSDR 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 TINov 30, 2001 · Bell 206B · Turbine GovernorSDR CA020405026Governor · inoperative(CAN) GOVERNOR WILL NOT HOLD 100 PERCENT IN FLIGHT.Nov 28, 2001 · Bell 206B · Turbine GovernorSDR CA011126001Bearing · damaged(CAN) OUTER AND INNER RACE OF BEARING DISPLAY MODERATE PITTING AND PEELING.ONE BALL DISPLAYS HEAVY PITTINGNov 22, 2001 · Bolkms BO105CBS · Main Rotor GearboxSDR 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 .Nov 16, 2001 · N294EH · Bolkms BO105S · Engine (Turbine/Turboprop)SDR CA011114017Bearing · defective(CAN) BOTH INNER AND OUTER RACE OF BEARING DISPLAYED MODERATE PITTING AND PEELINGNov 14, 2001 · Bolkms BO105CBS · Main Rotor GearboxSDR CA020405025Bulkhead · cracked(CAN) CRACK FOUND DURING INSPECTION IN AFT LT TAIL ROTOR GEARBOX MOUNTING AREA.Nov 14, 2001 · Bell 206B · Rotorcraft Tail BoomSDR 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 SUPNov 13, 2001 · Bell 206B · Engine/Transmission CouplingSDR 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 CLEARINNov 9, 2001 · Bell 206B · Turbine GovernorSDR CA011114016Bearing · peeling(CAN) CHIP LIGHT INDICATION.GEARBOX DISASSEMBLED FOR INVESTIGATION.BEARING PLATING FOUND PEELING.REPLACED WITH NEWNov 2, 2001 · Bolkms BO105CBS · Main Rotor GearboxSDR 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 SHOOct 29, 2001 · Hughes 369D · Directional Gyro and Indicating SystemSDR LS1R076731Filter · leakingENGINE OIL FILTER IS LEAKING.Oct 22, 2001 · N206BX · Bell 206B3 · Turbine Engine Oil SystemSDR CA011016002Sprag Clutch · chipped(CAN) ON 300 HOUR (SLING TIME OF 221.1 HOURS) INSPECTION THE SPRAG ASSEMBLY WAS FOUND TO HAVE ONE BROKE SPRAGOct 16, 2001 · Hughes 369D · Engine/Transmission CouplingSDR KUVA076138Bearing Race · chafedBEARING P/N 23034787 S/N MP78657 CHAFFED RACE P/N 6890483 S/N MP119218 CAUSING BOTH PARTS TO SCRAP.Oct 10, 2001 · N168BH · Agusta A109A2 · Turbine Engine Compressor SectionSDR ERAA076672Engine · making metalENGINE IS MAKING METAL. G.B. SN CAG-36092 PTO GEAR PITTED. ACTION TAKEN: INSTALLED SERVICEABLE GEAR BOX.Oct 9, 2001 · N426EH · Bolkms BO105S · Engine (Turbine/Turboprop)SDR ERAA076673Engine · malfunctionedTURBINE RUNS HOT, LOW POWER. STRETCHED NR 1 BLADES. ACTION TAKEN: INSTALLED NEW NR 1 & 2 WHEEL & NR 2 NOZZLE.Oct 9, 2001 · N426EH · Bolkms BO105S · Engine (Turbine/Turboprop)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 6Oct 9, 2001 · N298EH · Bolkms BO105S · Engine (Turbine/Turboprop)SDR 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 PLACOct 9, 2001 · Turbine SectionSDR 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 SIZEDOct 5, 2001 · Bolkms BO105C · Main Rotor GearboxSDR 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: ABOOct 3, 2001 · N292EH · Bolkms BO105S · Fuel Controlling SystemSDR 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 SOct 3, 2001 · N153EH · Bolkms BO105S · Fuel Controlling SystemSDR 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 Oct 3, 2001 · N149EH · Bolkms BO105S · Fuel Controlling SystemSDR 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. Sep 30, 2001 · N500KM · Bolkms BO105C · Rotorcraft Tail BoomSDR 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 GEARSHAFTSep 27, 2001 · Hughes 369D · Tail Rotor GearboxSDR 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.Sep 18, 2001 · N2270G · Bell 206B3 · Turbine SectionSDR 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.Sep 18, 2001 · N2270G · Bell 206B3 · Turbine SectionSDR 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.Sep 18, 2001 · N2270G · Bell 206B3 · Turbine SectionSDR 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.Sep 18, 2001 · Bolkms BO105S · Turbine Engine Reduction GearSDR 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-INSSep 5, 2001 · Hughes 369D · Tail Rotor GearboxSDR 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 RETSep 4, 2001 · Bell 47G4 · Fuel Control/Turbine EnginesSDR 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 230735Aug 28, 2001 · Bell 206B · Fuel Injector NozzleSDR 2001F00599Blade · corrodedDURING DISASSEMBLY TO INSPECT FOR HIDDEN DAMAGE. SULFIDATION ON BACK SIDE OF BLADES. ENSURE PROPER APPLICATIONS OF COATING IS COMPLIED WITH. (M)Aug 24, 2001 · N158H · Bell 206B · Turbine SectionSDR 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.Aug 23, 2001 · Hughes 369D · Main Rotor BladesSDR 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)Aug 22, 2001 · Hughes 369D · Main Rotor BladesSDR 2001F00697Actuator · intermittentTHROTTLE TRIM LINK ACTUATOR, OPERATES INTERMITTENTLY. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (M)Aug 22, 2001 · N485EC · Bolkms BO105S · Fuel Controlling SystemSDR 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.Aug 21, 2001 · N5031U · Bolkms BO105S · Turbine SectionSDR 2001FA0000330Spline Adapter · failedENGINE SHUTDOWN DURING FLIGHT DUE TO FLAMEOUT. CAUSE: FAILURE OF SPLINED ADAPTER IN COMPRESSOR ASSEMBLY.Aug 17, 2001 · N55NW · Agusta A109A2 · Turbine Engine Compressor SectionSDR 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 WIAug 11, 2001 · N493HL · Bolkms BO105CBS · Engine (Turbine/Turboprop)SDR ALG2001F00023Engine · making metalENGINE CHIP LIGHT ILLUMINATED ON LANDING. FOUND LARGE FLAKE ON BOTTOM CHIP PLUG. REPLACED ENGINE ASSEMBLY.Aug 8, 2001 · N139H · Bell 206B · Engine (Turbine/Turboprop)
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