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 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.SDR 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.SDR 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.SDR 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.SDR HEEA0012345Nozzle · defectiveINSPECTION REVEALED: COATING LIFTING ON NR2 NOZZLE 1ST AND 2ND STAGE TIP PATHS. INSTALLED A DALLAS AIRMOTIVE OVERHAULED NR2 NOZZLE.SDR 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 SDR 98ZZZX297Governor · failedFLUCTUATING TORQUE SETTING. FOUND GOVERNOR DRIVE BROKEN. REPLACED GOVERNOR.SDR 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.SDR CA971223016Strap Pack · broken(CAN) TOP SEGMENT OF STRAP PACK ON MAIN ROTOR HEAD FOUND BROKEN AT THE BLADE GRIP ATTACHMENT.SDR 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.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.SDR 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.SDR 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.SDR HEEA0012098Fuel Pump · leakingFUEL LEAKING FROM SEAL DRAIN.SDR CA971216042Blower · vibrating(CAN) CASEY BLOWER MOTOR HAD EXCESSIVE VIBRATION AFTER OVERHAUL.SDR 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.SDR CA980126004Governor · failed(CAN) ENGINE EXPERIENCED A DROP IN ATTAINABLE N2 RPM. ADJUSTMENT ATTEMPTED, BUT HITTING MAX STOP AFTER ADJUSTMENT.SDR 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.SDR CA971113059Valve · leaking(CAN) WHEN START PUMP TURNED ON, CHECK VALVE LEAKS. VALVE REPLACED.SDR CA971125004Blades · delaminated(CAN) LEADING EDGE STRIP OF BOTH TAIL ROTOR BLADES DEBONDING. DEBONDING OCCURRED IN SAME AREA ON BOTH BLADES.SDR AU971346Pin · broken(AUS) MAIN ROTOR BLADE PIN BROKEN OFF IN AREA OF THREADED SHANK.SDR 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.SDR HEEA0011718Pipe · leakingENGINE FUEL LEAKING FROM SWEDGED RING AT B-NUT.SDR CA971113041Switch · failed(CAN) CYCLIC TRIM SWITCH FAILED CAUSING A HARD LEFT TRIM MOTOR RUN AWAY.SDR HEEA0011569Blade · corrodedTURBINE REMOVED DUE TO 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED: MINOR SULFIDATION ON NR 1 WHEEL BLADES. SCRAPPED WHEEL.SDR 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.SDR 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.SDR 97ZZZX4656Gearbox · leakedREMOVED GEARBOX DUE TO TORQUEMETER PISTON PLUG LEAKING OIL AT A RATE OF ONE DRIP EVERY 4 SECONDS.SDR HEEA0011559Gear Box Assy · low oil pressGEAR BOX ASSY LOW OIL PRESSURE.SDR 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.SDR 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. LSDR 97ZZZX4709Vane · failedPRECAUTIONARY LANDING DUE TO COMPRESSOR STALL. FOUND CASE EROSION AND LOSS OF VANE.SDR HEEA0011458Igniter Box · defectiveIGNITER BOX THREADS ON IGNITER LEAD CONNECTOR CROSS THREADED.SDR CA971020017Transmission · failed(CAN) METAL PARTICLES ON MAGNETIC CHIP PLUG OF SIZE AND QUANTITY DEEMED UNACCEPTABLE BY THE MANUFACTURER.SDR CA971020018Blade · erroded(CAN) HOLE ERODED THROUGH LEADING EDGE OF TIP CAP.SDR 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 SDR 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.SDR HEEA00110991st Stg Wheel · sulfidationENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED: MINOR SULPHIDATION ON ALL #1 WHEEL BLADES. SCRAPPED WHEEL.SDR 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.SDR 97ZZZX4977Governor · failedUNABLE TO ADJUST DROOP COMP. REPLACED GOVERNOR.SDR CA980126003Governor · failed(CAN) IN-FLIGHT DROP IN N2 RPM. TRIM DID NOT BRING RPM UP. BEEP RANGE SHIFTED DOWN. UNABLE TO ADJUST WITHIN RANGE.SDR CA970930022Shaft · sheared(CAN) STARTER GENERATOR SHAFT SHEARED ON START UP.SDR 97ZZZX4976Governor · malfunctionedGOVERNOR HAS NO MORE ADJUSTMENT FOR COMPENSATION. REPLACED GOVERNOR.SDR CA980126002Governor · failed(CAN) ENGINE UNABLE TO HOLD STEADY N2 RPM, CAUSING ACFT TO YAW DURING FLUCTUATIONS.SDR 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.SDR CA971113040Gearbox · contamination(CAN) SCAVENGE OIL SYSTEM FAILURE. POSSIBLY MAKING METAL, REPLACED.SDR 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.SDR HEEA0010582Actuator · failedACTUATOR WILL NOT DECREASE.SDR 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.SDR 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.
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