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 HEEA0012377Coupling · wornENGINE REMOVED DUE TO TURBINE INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED: STEP WEAR BEYOND SERVICEABLE LIMITS ON N1 COUPLING SPLINES (FAILED NO-GO GAUGE) INSTALLED A NEW N1 COUPLING.Dec 18, 1997 · N137AE · Bolkms BO105S · Turbine SectionSDR HEEA0012378Spline Adapter · wornENGINE REMOVED DUE TO CRACKED COMPRESSOR SCROLL AND VIBRATION. UPON INSPECTION OF COMPRESSOR PARTS NOTED: WORN BEYOND SERVICEABLE LIMITS ON SPLINE ADAPTER RETAINING RING GROOVE. INSTALLED A NEW SPLINE ADAPTER.Dec 18, 1997 · N4573B · Bolkms BO105S · Turbine Engine Compressor SectionSDR 98ZZZX2Filter · crushedAPPEARS A FOREIGN OBJECT WAS INSERTED INTO THE INLET END OF THE FUEL NOZZLE CONTACTING THE CRUSTING FILTER ASSY. NO FOREIGN OBJECTS SHOULD EVER BE INSERTED INTO INLET END.Dec 15, 1997 · Fuel Injector NozzleSDR CA980114005Blade · delaminated(CAN) A NEW LEADING EDGE WAS INSTALLED 451 HOURS AGO IN COMPLIANCE WITH MDHS NOTICE DN187 PART 11. A SMALL DELAMINATION VOID .3750 INCH IN DIAMETER, 2 INCHES FROM THE TIP AND .1250 INCH FROM THE TRAILING EDGE OF THE LEADING EDGE STRIP.Dec 11, 1997 · Hughes 369D · Tail Rotor BladesSDR HEEA0012345Nozzle · defectiveINSPECTION REVEALED: COATING LIFTING ON NR2 NOZZLE 1ST AND 2ND STAGE TIP PATHS. INSTALLED A DALLAS AIRMOTIVE OVERHAULED NR2 NOZZLE.Dec 11, 1997 · N911DD · Bolkms BO105S · Turbine SectionSDR 97ZZZX5154Fuel Nozzle · failedFUEL NOZZLE INLET SCREEN, ALSO KNOWN AS (LAST CHANCE FILTER) SHOWS SIGNS OF INITIAL COLLAPSE. COLLAPSED SCREEN CANNOT BE DETECTED WITHOUT DISASSEMBLY OF NOZZLE. SCREEN IS BEING MANUFACTURED FROM TOO THIN OF MATERIAL AND IS COLLAPSING UNDER NORMAL CONDITIONS Dec 10, 1997 · N5119V · Hughes 369D · Fuel Injector NozzleSDR 98ZZZX297Governor · failedFLUCTUATING TORQUE SETTING. FOUND GOVERNOR DRIVE BROKEN. REPLACED GOVERNOR.Dec 7, 1997 · N5366Y · Bolkms BO105S · Turbine GovernorSDR 98ZZZX1Filter · contaminatedFUEL NOZZLE FILTER SCREEN WAS FOUND WITH UNKNOWN SUBSTANCE, CONTAMINATED 50 PERCENT OF SCREEN AREA. SUGGEST INSPECTING FUEL PUMP FUEL FILTER FOR POSSIBLE BLOCKAGE CAUSING FUEL PUMP TO GO TO FILTER BYPASS.Dec 5, 1997 · Fuel Injector NozzleSDR CA971223016Strap Pack · broken(CAN) TOP SEGMENT OF STRAP PACK ON MAIN ROTOR HEAD FOUND BROKEN AT THE BLADE GRIP ATTACHMENT.Dec 2, 1997 · Hughes 369E · Main Rotor HeadSDR CA971216039Boot · split(CAN) RUBBER BOOT CONNECTING THE ENGINE OIL TANK TO THE AIRFRAME FILLER NECK SPLIT UNDER THE ATTACHING CLAMP CAUSING THE LOSS OF 1.5 LITRE OF OIL.Nov 28, 1997 · Hughes 369D · Engine Oil Storage (Airframe Furnished)SDR CA971219004Pin · broken(CAN) ON POST-FLIGHT INSPECTION, A BROKEN BLADE PIN WAS FOUND ON THE YELLOW BLADE. THE FOLDING BLADE PIN HAD STAYED TOGETHER. NO DAMAGE TO THE MAIN ROTOR BLADE ON THE LEAD LAG LINKS.Nov 26, 1997 · Hughes 369D · Main Rotor BladesSDR HEEA0012125Nozzle · crackedENGINE REMOVED DUE TO N1 DRAG. UPON INSPECTION OF TURBINE PARTS NOTED: BURNT AND CRACKED BEYOND SERVICEABLE LIMITS ON NR1 NOZZLE VANES. INSTALLED A DALLAS AIRMOTIVE OVERHAULED NR1 NOZZLE.Nov 26, 1997 · N135AE · Bolkms BO105S · Fuel Injector NozzleSDR CA971208004Stiffener · cracked(CAN) BOTH STIFFENER AND FRAME CRACKED AND BROKEN OFF AFT OF HOLE STATION 154.50, AT FORWARD LEFT LEG. FRAME CRACKED APPROXIMATELY .75 INCH ON EACH SIDE INBOARD AND OUTBOARD AFT SIDE OF LEFT ENGINE MOUNT ATTACHMENT BOLT. SRM SECTION 5-1-4 HAS REPAIR.Nov 20, 1997 · Bell 206L · Engine Mount SectionSDR HEEA0012098Fuel Pump · leakingFUEL LEAKING FROM SEAL DRAIN.Nov 19, 1997 · N2269A · Bell 206B3 · Engine Fuel PumpSDR CA971216042Blower · vibrating(CAN) CASEY BLOWER MOTOR HAD EXCESSIVE VIBRATION AFTER OVERHAUL.Nov 12, 1997 · Bell 206B · Air Distribution FanSDR 98ZZZX2099Governor · malfunctionedDURING FLIGHT, NR 2 ENGINE BEGAN OSCILLATING. PILOT RETURNED TO BASE AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED ENGINE N2 GOVERNOR DUE TO STIFF CONTROL SHAFT. REF: ALLISON C-20 IPC, CHAPTER 73-20-00, FIG 2, ITEM 81.Nov 2, 1997 · N4573B · Bolkms BO105S · Turbine GovernorSDR CA980126004Governor · failed(CAN) ENGINE EXPERIENCED A DROP IN ATTAINABLE N2 RPM. ADJUSTMENT ATTEMPTED, BUT HITTING MAX STOP AFTER ADJUSTMENT.Nov 1, 1997 · Hughes 369D · Turbine GovernorSDR HEEA0011731Nozzle · crackedTURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON NR2 NOZZLE 1ST STAGE INNER BAND. INSTALLED A DALLAS AIRMOTIVE OVERHAULED NR2 NOZZLE.Oct 31, 1997 · Turbine SectionSDR CA971113059Valve · leaking(CAN) WHEN START PUMP TURNED ON, CHECK VALVE LEAKS. VALVE REPLACED.Oct 30, 1997 · Hughes 369D · Engine Fuel DistributionSDR CA971125004Blades · delaminated(CAN) LEADING EDGE STRIP OF BOTH TAIL ROTOR BLADES DEBONDING. DEBONDING OCCURRED IN SAME AREA ON BOTH BLADES.Oct 29, 1997 · Hughes 369D · Tail Rotor BladesSDR AU971346Pin · broken(AUS) MAIN ROTOR BLADE PIN BROKEN OFF IN AREA OF THREADED SHANK.Oct 23, 1997 · Hughes 369D · Main Rotor BladesSDR CA971119007Cargo Hook · failed(CAN) CARGO HOOK INADVERTENTLY RELEASED SLING LOAD IN-FLIGHT. ON TESTING CIRCUIT, IT TRIPPED THE CIRCUIT BREAKER. ON ONE OCCASION THE HOOK WOULD NOT RELEASE DURING TEST.Oct 23, 1997 · Bolkms BO105C · Agricultural Spray SystemSDR HEEA0011718Pipe · leakingENGINE FUEL LEAKING FROM SWEDGED RING AT B-NUT.Oct 22, 1997 · N3533T · Bolkms BO105S · Engine Fuel DistributionSDR CA971113041Switch · failed(CAN) CYCLIC TRIM SWITCH FAILED CAUSING A HARD LEFT TRIM MOTOR RUN AWAY.Oct 20, 1997 · Hughes 369D · Main Rotor ControlSDR HEEA0011569Blade · corrodedTURBINE REMOVED DUE TO 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED: MINOR SULFIDATION ON NR 1 WHEEL BLADES. SCRAPPED WHEEL.Oct 20, 1997 · N3181J · Bell 206B3 · Turbine SectionSDR CA971113039Turbine · failure(CAN) COULD NOT START ENGINE DUE TO N2 LOCKUP. START ABORTED. RUBBING NOISE COULD BE HEARD WHEN N2 TURBINE ROTATED. TURBINE REPLACED. PART TC: 18.Oct 19, 1997 · Hughes 369D · Turbine SectionSDR CA971113038Turbine · seized(CAN) TURBINE WOULD SEIZE ON START, WOULD BREAK LOOSE AFTER COOL DOWN, BUT GRINDING NOISE FROM TURBINE PERSISTS. SOUNDS LIKE BLADE RUB. REPLACED.Oct 18, 1997 · Hughes 369D · Turbine SectionSDR 97ZZZX4656Gearbox · leakedREMOVED GEARBOX DUE TO TORQUEMETER PISTON PLUG LEAKING OIL AT A RATE OF ONE DRIP EVERY 4 SECONDS.Oct 17, 1997 · N108FH · Bell 206B · Turbine Engine Reduction GearSDR HEEA0011559Gear Box Assy · low oil pressGEAR BOX ASSY LOW OIL PRESSURE.Oct 16, 1997 · N86CH · Bolkms BO105S · Turbine Engine Accessory DriveSDR HEEA0011460N1 Coupling · wearENGINE REMOVED DUE TO IMPELLER CYCLES: TURBINE DISASSEMBLED DUE TO N1 DRAG ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: SPLINE WEAR BEYOND SERVICEABLE LIMITS ON N1 COUPLING SPLINE (FAILED NO GO GAUGE) INSTALLED A NEW N1 COUPLING.Oct 14, 1997 · N50293 · Bolkms BO105S · Turbine SectionSDR 97ZZZX4653Bearing · failedNR 1 ENGINE CHIP LIGHT CAME ON AFTER START-UP. MAINTENANCE FOUND PASTE ON UPPER AND LOWER CHIP PLUGS. CLEANED PLUGS, OIL SAMPLE WAS TAKEN; 1.2 HOURS LATER, NR 1 ENGINE CHIP LIGHT CAME ON AGAIN. MAINTENANCE REMOVED PLUGS. UPPER PLUG HAD CHIPS AND SLIVER. LOct 13, 1997 · N105RH · Bolkms BO105C · Turbine Engine Reduction GearSDR 97ZZZX4709Vane · failedPRECAUTIONARY LANDING DUE TO COMPRESSOR STALL. FOUND CASE EROSION AND LOSS OF VANE.Oct 11, 1997 · N206BX · Bell 206B · Turbine Engine Compressor SectionSDR HEEA0011458Igniter Box · defectiveIGNITER BOX THREADS ON IGNITER LEAD CONNECTOR CROSS THREADED.Oct 10, 1997 · N5421E · Bolkms BO105S · ExciterSDR CA971020017Transmission · failed(CAN) METAL PARTICLES ON MAGNETIC CHIP PLUG OF SIZE AND QUANTITY DEEMED UNACCEPTABLE BY THE MANUFACTURER.Oct 8, 1997 · Bolkms BO105C · Main Rotor GearboxSDR CA971020018Blade · erroded(CAN) HOLE ERODED THROUGH LEADING EDGE OF TIP CAP.Oct 8, 1997 · Bolkms BO105C · Tail Rotor BladesSDR 99ZZZX409Blade · damagedTHE PILOT REPORTED THE NR 2 ENGINE BEGAN TO 'BOG DOWN' DURING A PRECAUTIONARY LANDING TO AN OFFSHORE PLATFORM AFTER THE NR 2 ENGINE FIRE WARNING LIGHT ILLUMINATED. METALURGICAL EXAMINATION BY THE ENGINE MANUFACTURER REVEALED THE FIRST STAGE TURBINE WHEEL HAD Oct 6, 1997 · N54197 · Bolkms BO105CBS · Turbine SectionSDR CA971113032Governor · failed(CAN) GOVERNOR ALLOWS RPM TO DROOP 3 PERCENT WITH NO RECOVERY AND OVERSPEEDS 2 TO 3 PERCENT. ERRATIC OPERATION, OCCASIONAL SURGING, RIGGING COULD NOT ADJUST.Oct 3, 1997 · Hughes 369D · Turbine GovernorSDR HEEA00110991st Stg Wheel · sulfidationENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED: MINOR SULPHIDATION ON ALL #1 WHEEL BLADES. SCRAPPED WHEEL.Sep 29, 1997 · N818SH · Bolkms BO105S · Turbine SectionSDR CA971003005Fitting · cracked(CAN) CRACK FOUND RUNNING VERTICALLY BETWEEN RIVET HOLES. PART REPLACED WITH UPGRADE P/N 206-031-329-103S. THIS IS AT TAIL BOOM ATTACH.Sep 26, 1997 · Bell 206B · Rotorcraft Tail BoomSDR 97ZZZX4977Governor · failedUNABLE TO ADJUST DROOP COMP. REPLACED GOVERNOR.Sep 22, 1997 · N8776 · Bolkms BO105S · Turbine GovernorSDR CA980126003Governor · failed(CAN) IN-FLIGHT DROP IN N2 RPM. TRIM DID NOT BRING RPM UP. BEEP RANGE SHIFTED DOWN. UNABLE TO ADJUST WITHIN RANGE.Sep 18, 1997 · Hughes 369D · Turbine GovernorSDR CA970930022Shaft · sheared(CAN) STARTER GENERATOR SHAFT SHEARED ON START UP.Sep 12, 1997 · Hughes 369E · Starter-GeneratorSDR 97ZZZX4976Governor · malfunctionedGOVERNOR HAS NO MORE ADJUSTMENT FOR COMPENSATION. REPLACED GOVERNOR.Sep 11, 1997 · N5366Y · Bolkms BO105S · Turbine GovernorSDR CA980126002Governor · failed(CAN) ENGINE UNABLE TO HOLD STEADY N2 RPM, CAUSING ACFT TO YAW DURING FLUCTUATIONS.Aug 26, 1997 · Hughes 369D · Turbine GovernorSDR HEEA0010839Fuel Control · failedFUEL CONTROL WOULD NOT SHUT OFF. AFTER THROTTLE IS CLOSED FUEL CONTROL CONTINUES TO FLOW; A 150CC OF FUEL COMES OUT. REPLACED WITH SERVICEABLE FUEL CONTROL.Aug 21, 1997 · N22425 · Bell 206L1 · Fuel Control/Reciprocating EnginesSDR CA971113040Gearbox · contamination(CAN) SCAVENGE OIL SYSTEM FAILURE. POSSIBLY MAKING METAL, REPLACED.Aug 20, 1997 · Hughes 369D · Turbine Engine Reduction GearSDR CA970902001Bracket · cracked(CAN) ROTOR CONTROL BEARING AND TORQUE TUBE ASSEMBLY BRACKET CAP CRACKED OFF. THE BRACKET ASSY CONSISTS OF THE BRACKET AND BEARING RETAINING CAP.Aug 6, 1997 · Hughes 369D · Main Rotor ControlSDR HEEA0010582Actuator · failedACTUATOR WILL NOT DECREASE.Aug 6, 1997 · N49EA · Bell 206L3 · Main Rotor ControlSDR HEEA0010554Coupling · wornENGINE REMOVED DUE TO METAL. UPON INSPECTION OF TURBINE PARTS NOTED: WEAR BEYOND SERVICEABLE LIMITS ON N1 COUPLING SPLINES (FAILED NO GO GAUGE) INSTALLED A NEW N1 COUPLING.Aug 5, 1997 · N4573B · Bolkms BO105S · Turbine SectionSDR HEEA0010555Wheel · not markedRECEIVING INSPECTION REVEALED: PART NUMBER AND AREA FLOW NOT ETCHED ON PART. INSTALLED A NEW #2 WHEEL. SUBMITTAL FOR SHIPPING REIMBURSEMENT ACCOMPLISHED ON AFA#31075A. PART RETURN PER FAX 5977:MKR:970297.Aug 5, 1997 · N3538T · Bolkms BO105S · Turbine Section
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