Allison 250-C20
Service difficulty reports · 945
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 = '250C20' 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 = '250C20' 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 CA960502011Nozzle · failed(CAN) SUSPECTED OF CAUSING SEVERE CARBON BUILD UP INSIDE COMBUSTION LINER DOME. NO VISIBLE DAMAGE WAS NOTED. NOZZLE REPLACED, AIRCRAFT RETURNED TO SERVICE.SDR 96ZZZX2391Engine · chip lightRECEIVED OIL CHIP LIGHT INDICATION. PERFORMED REQUIRED MAINTENANCE PER ALLISON 250-C20S AND SOLOY/CESSNA MAINTENANCE AND OVERHAUL MANUALS. RECEIVED SECOND CHIP LIGHT INDICATION 3.9 HRS TIS LATER. ENGINE REMOVED AND SENT OUT FOR INSPECTION/REPAIR PER ALLISONSDR 96ZZZX1814Governor · erraticDURING LEVEL FLIGHT, NOTED THE TORQUE NEEDLES WERE ERRATIC. NR 1 GOVERNOR SHAFT WAS FOUND BINDING. REPLACED GOVERNOR, OPS CHECKED GOOD.SDR AU960184Washer · unapproved part(AUS) TAIL ROTOR DRIVE TRAIN AFT SHORT SHAFT TO LONG TAIL ROTOR DRIVE SHAFT DISC ASSEMBLY FITTED WITH INCORRECT TYPE FLAT WASHERSINSTEAD OF WITH CORRECT TYPE BEVELLED WASHERS AS REQUIRED BY THE MAINTENANCE MANUAL - UNAPPROVED PART - PERSONNEL/MAINTENANCE ERROSDR CA960312018Freewheel Assy · leaking seal(CAN)FORWARD SEAL LEAKING EXCESSIVELY. TIME SINCE REPAIR THIS INSTALLATION 496.8 HOURS.SDR CA960312013Servo · motoring(CAN)UNCOMMANDED SERVO MOTORING. SERVO OVERHAULED 2.9 HOURS PREVIOUSLY.SDR CA960312011Cyclic Stick · worn(CAN)AN INSPECTION OF THE LOWER END OF THE CYCLIC STICK REVEALED MECHANICAL DAMAGE GREATER THAN ALLOWABLE LIMIT.SDR CA960312030Fcu · failure(CAN) TIME THIS INSTALLATION 1001.1 HOURS. UNABLE TO ADJUST FOR SLOW COLD STARTS. ALSO CAUSING A BURBLING SOUND NEAR TOP END OF START - SUSPECT COMPRESSOR STALL DUE TO FCU. FCU REPLACED, HELICOPTER RETURNED TO SERVICE.SDR CA960312015Liner · cracked(CAN) CRACKS FOUND IN DOUBLER LIP AREA ON PREVIOUS REPAIR WELDS. UNIT REPLACED, AIRCRAFT RETURNED TO SERVICE.SDR CA960312007Gearbox · teeth wear(CAN)CHIP LIGHT ON. PLUG INSPECTED AND FOUND GRAY PASTE. 23.2 HOURS LATER DURING 600 HOUR INSPECTION PROBLEM FOUND WITH GEAR TEETH.SDR 96ZZZX1155Nozzle · defectiveTHE NR 2 TURBINE NOZZLE EXPERIENCED A NR 2 BLADE TIP PATH SEPARATION IN-FLIGHT. THE PILOT REPORTED A 30 DEGREE RISE IN TOT AND RETURNED TO THE MAINTENANCE BASE. VENDOR'S ENGINEERING DEPARTMENT DETERMINED THE METAL SPRAY APPLICATION PROCESS WAS THE PRIMARY CASDR CA960131014Hanger Assembly · worn(CAN)WHEN CARRYING OUT ASB 206-95-86 REV.B, INSPECTION OF TAIL ROTOR DRIVESHAFT HANGER ASSEMBLY AND SPRING. A VISIBLE WEAR STEP IN THE FILLET RADIUS OF THE HANGER LUG WAS FOUND.SDR CA960312017Gauge · reads high(CAN)GAUGE READS 30 DEGREES HIGH.SDR CA960126024Linear Actuator · seized(CAN)ACTUATOR UNIT SEIZED WILL NOT RETRACT OR EXTEND.SDR CA960126018Retaining Ring · mis installed(CAN)RETAINING RING FOUND NOT TO BE FULLY INSTALLED DURING A TURBINE REMOVAL. IT WAS APPROXIMATELY 3/4 OF THE WAY OUT. ASSEMBLY RE-SHIMMED AND NEW RETAINING RING INSTALLED. AIRCRAFT RETURNED TO SERVICE.SDR CA960312020Swashplate Assy · wearing(CAN)UPON 300 HOUR INSPECTION PARTICLES OF TEFLON AND BRASS WERE FOUND COMING FROM PIVOT SLEEVE AND SWASHPLATE SUPPORT. SWASHPLATE ASSY WAS REMOVED FOR INSPECTION AND FOUND BRASS SHIMS UNDER SLIDER BEARING S WERE WORKING OUT AND BREAKING APART CAUSING SLIDER WSDR AU960275Turbine · faulty(AUS) ENGINE GAS PRODUCER TURBINE ASSEMBLY FAULTY - TURBINE ASSEMBLY HAD NIL HOURS SINCE OVERHAUL - GP SUPPORT MOUNTING FLANGE BENT - DURING DISMANTLING TO CHANGE THE SUPPORT THE FOLLOWING DEFECTIVE ITEMS WERE FOUND :-1. 1ST STAGE NGV PNO 6895021 - CRACKED ANDSDR 96ZZZX745Nozzle Body · crackedDURING INSPECTION OF FUEL NOZZLE AND DISASSEMBLY, REMOVED CORROSION FROM THE BODY ASSY AND FOUND PITTING AND CRACKS ON THE NOZZLE BODY ASSY.SDR CA970311028Support Channel · cracked(CAN) CRACKS FOUND IN UPPER FLANGE BEND RADIUS, FORWARD ENGINE ATTACHMENT. LOWER ROOF BEAM WEB P/N 206-031-200-019 CRACKED.SDR CA951218004Fcu · leaking(CAN)FUEL CONTROL LEAKING FROM ALLEN KEY, L/H SIDE OF FCU BELOW 'FROM PTG FITTING' WITH BOOST PUMP ON.SDR CA960126007Transmission · making metal(CAN)TRANSMISSION REMOVED DUE TO MAKING METAL. TIME THIS INSTALLATION 120.8 HOURS.SDR CA951221020Fcu · malfunction(CAN)FCU WOULD NOT RETURN TO FLIGHT IDLE WHEN THROTTLE WAS ROLLED OFF. THROTTLE CYCLED SEVERAL TIMES BEFORE ENGINE RETURNED TO IDLE. ASSEMBLY REPLACED AND AIRCRAFT RETURNED TO SERVICE.SDR CA960116010Fcu · failure(CAN)START LAG AT AROUND 28 PERCENT N1 UP TO 38 PERCENT. THEN START RESUMED FOR SECOND PEAK. WOULD NEED HIGH CHARGE BATTERY FOR START-UP. FIRST PEAK 720 DEGREES, THEN WENT BACK DOWN TO 550 DEGREES THROUGH 28 PERCENT N1 TO 38 PERCENT N1. SECOND PEAK AT 38 PERCSDR 96ZZZX109Spring · brokenDURING CRUISE FLIGHT, NR 2 ENGINE DROPPED TO FLIGHT IDLE. GOVERNOR SPRING ON NR 2 ENGINE WAS FOUND BROKEN.SDR 96ZZZX744Spring · brokenDURNG CRUISE FLIGHT, NR 2 ENGINE DROPPED TO FLIGHT IDLE. GOVERNOR SPRING ON NR 2 ENGINE WAS FOUND BROKEN.SDR CA960502062Fuel Control · contaminated(CAN) AIRCRAFT HAD TO OVERNIGHT DUE TO POOR WEATHER CONDITIONS. NEXT MORNING HOT STARTS. BATTERY, FUEL NOZZLE CHANGED, NO EFFECT. FINALLY CHANGED FCU, GOOD STARTS. ORIGINAL FCU BACK FROM REPAIR WAS FOUND TO BE OK. SUSPECT MOISTURE OR OTHER CONTAMINANTS.SDR 95ZZZX7038Compressor · fodAIRCRAFT ON PART 91 FLIGHT RETURNING TO BASE, PILOT OBSERVED A TORQUE SPLIT OF APPROXIMATELY 12-15 PERCENT. PILOT MATCHED TORQUE WITH TRIM SWITCH, NOTICED NR 2 ENGINE RUNNING HOTTER AND FASTER THAN NR 1. PILOT REDUCED POWER TO KEEP ENGINES IN NORMAL OPERATINSDR 95ZZZX6890Spool Bushing · wornDURING TEAR DOWN, FOUND GOVERNOR HAD WORN SPOOL BUSHING. CAUSES POSSIBLE ENGINE VIBRATION.SDR CA951108013Nozzle · cracked(CAN)ENGINE WAS SENT IN FOR COMPLAINT OF LOW POWER. THE LOG BOOK INDICATES 3098 HOURS SINCE NEW. ENGINE WAS TESTED AND WAS FOUND TO HAVE A RUB AND VIBRATION. UNABLE TO COMPLETE TEST TO CONFIRM LOW POWER. ON DISASSEMBLY THE SECOND STAGE NOZZLE WAS FOUND TO HAVESDR 95ZZZX5716Engine · flame-outHELICOPTER EXPERIENCED 3 ENGINE FLAME-OUTS WITHIN APPROXIMATELY 5 MINUTES. THE AUTO RE-IGNITION STARTED THE ENGINE IN-FLIGHT EACH TIME. NORMAL LANDING WAS ACCOMPLISHED. A COMPLETE INSPECTION OF THE FUEL SYSTEMS, CONTROL SYSTEMS, FUEL FILTERS, AIR FILTERS, FSDR 95ZZZX4538Turbine Wheel · shroud crackedTURBINE NR 3 WHEEL SHROUD CRACKED THROUGH.SDR 95ZZZX4539Gearshaft · step wearSPUR ADAPTER GEARSHAFT SPLINES ON TURBINE END STEPPED.SDR 95ZZZX4537Bearing · making metalGEARBOX 2 1/2 BEARING STARTING TO MAKE METAL. ROLLERS STARTING TO GALL.SDR 95ZZZX4540Bearing · spalledPTO BEARING STARTING TO SPALL AND MOVE METAL.SDR 95ZZZX4073Governor · malfunctionFROM CRUISE, A LOW POWER DESCENT INITIATED. WHEN POWER APPLIED, ENGINE RPM DECREASED. PILOT ENTERED AUTOROTATION, POWER REAPPLIED AND ENGINE FLAME-OUT OCCURRED. ENGINE RE-STARTED AND 95 PERCENT N2, BUT WHEN POWER APPLIED FOR LANDING, ENGINE FLAME-OUT. AUTOSDR CA950828012Fcu · failure(CAN)ENGINE FLAMED OUT WHEN THROTTLE WAS ROLLED BACK TO IDLE AFTER LANDING. DURING THE TWO PREVIOUS DAYS LEADING TO THE INCIDENT, THE IDLE HAD TO BE ADJUSTED THREE TIMES AND WOULD NOT STABILIZE. UNIT REPLACED, AIRCRAFT RETURNED TO SERVICE.SDR CA960126008Fcu · failure(CAN)ENGINE FLAMED OUT WHEN THROTTLE WAS ROLLED BACK TO IDLE AFTER LANDING. DURING THE TWO PREVIOUS DAYS LEADING TO THE INCIDENT, THE IDLE HAD TO BE ADJUSTED THREE TIMES AND WOULD NOT STABILIZE. FCU REPLACED AND AIRCRAFT RETURNED TO SERVICE.SDR HEEA955428Filter Assembly · inoperativeFILTER ASSY INOPERATIVE.SDR CA950828004Fcu · failure(CAN)INCONSISTENT STARTS AND UNABLE TO SHUT DOWN ENGINE ON ONE OCCASION. FCU REPLACED, HELICOPTER RETURNED TO SERVICE.SDR 95ZZZX3632Wheel · shaft mismfgFACTORY NEW WHEEL SPLINED ADAPTER SHAFT PILOT MEASURES 0.566 INCH WHICH IS APPROXIMATELY 0.010 INCH LARGER THAN MAXIMUM. WHEEL RETURNED TO ALLISON.SDR 95ZZZX3336Air Tube · hole chafedIN CRUISE FLIGHT, PILOT EXPERIENCED AN ENGINE TORQUE SPLIT, NR 1 ENGINE DROPPING OFF-LINE. LANDED ON OFFSHORE PLATFORM WITHOUT INCIDENT. FOUND HOLE CHAFED IN AIR TRANSFER TUBE, WITH ASSOCIATED CRACKS. ALLISON IPC, CHAPTERS 2-60, FIGURE 13, ITEM 24.SDR 95ZZZX3332Seal · leakingSEAL LEAKING. REMOVED AND REPLACED WITH NEW P/N SEAL.SDR 95ZZZX2202Fuel Control · failedON FINAL APPROACH WHEN POWER WAS APPLIED, NR 2 ENGINE TORQUE STOPPED AT 55. REPLACED FUEL CONTROL. 250C20 IPC FIGURE 9, ITEM 91.SDR 95ZZZX2200Fuel Control · malfunctionPILOT REPORTED TORQUE SPLITS AFTER TAKEOFF. UNABLE TO MATCH TORQUES. NR 2 ENGINE SURGING. REPLACED FUEL CONTROL.SDR 95ZZZX2204Tube Assy · looseIN FLIGHT, AIRCRAFT WAS UNABLE TO MAINTAIN N2 RPM. RETURNED TO BASE. FOUND CUSTOMER BLEED AIR LINE LOOSE AT FIREWALL FITTING.
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