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 98ZZZX1494Fuel Pump · failedFAILED BYPASS CHECK AT 100 HOUR INSPECTION. FUEL PUMP REMOVED AND SENT FOR OVERHAUL EVALUATION.SDR 98ZZZX1682Bearing · failedAFTER A NORMAL FLIGHT (EXTERNAL LOAD) AND SHUT-DOWN, THE PILOT REPORTED AN ABNORMAL NOISE WHILE TURNING ROTOR BACKWARDS TO TIE-DOWN POSITION. UPON REMOVAL OF THE TURBINE MODULE, THE FORWARD HALF OF THE NR 5 BEARING INNER CAGE FELL OUT. (THIS IS A 1-PIECE UNISDR HEEA0013667Gearbox Cover · leakingENGINE REMOVED DUE TO AFT T/M LEAK. INSPECTION REVEALED: LEAKING AT COVER AFT T/M BORE.SDR 98ZZZX1503Actuator · failedFOLLOWING TAKEOFF, RPM WARNING LIGHT, ATTEMPTED TO BEEP ENGINES DOWN - ONLY NR 1 RESPONDED. RETURNED AND EMERGENCY LANDING MADE. FOUND NR 2 ACTUATOR INOPERABLE. PARTS ON ORDER.SDR 98ZZZX1820Switch · failedDIFFERENTIAL PRESSURE SWITCH DEFECTIVE. INSTALLED ON AIRCRAFT AND DID NOT FUNCTION. REMOVED AND REPLACED.SDR CA980317078Sleeve · worn(CAN) AIRCRAFT WAS WASHED IN HANGER AND THE FOLLOWING MORNING WAS TOWED OUTSIDE FOR FLIGHT. ON PRE START CHECK, TAIL ROTOR PEDALS WERE LOCKED DUE TO TAIL ROTOR GRIPS FREEZING. OAT WAS -24C. O-RING TYPE SEALON INNER SLEEVE HAD WORNA GROOVE IN SLEEVE, WHICH WHILSDR CA980325007Engine · malfunctioned(CAN) PREVIOUSLY THIS AIRCRAFT HAD ENGINE ASSY REPLACED DUE TO A RAPID ENGINE DECELERATION ON 12/97. ENGINE WAS RE-INSTALLED AFTER HAVING A VIBRATION TESTCARRIED OUT. OTHER TESTS CARRIED OUT AND ENGINE RELEASED AS SERVICEABLE. AFTER FIVE HOURS OF AIRCRAFT TIMESDR CA980602038Governor · worn(CAN) TORQUE SPLITS OCCURRING DURING CRUISE. WORN N2 LINKAGE REPLACED AND TORQUE SPLITS STILL OCCURRED. POWER TURBINE GOVERNOR REPLACED.SDR 99ZZZX686Fuel Nozzle · damagedCOMBUSTION TURBINE LINER CHAFED, FUEL NOZZLE SHROUD DAMAGED. FOUND DURING 100-HOUR INSPECTION. FUEL NOZZLE WAS REPLACED AND SENT FOR REPAIR. S/N AG55376. CONTROL NR 98-3-5.SDR 98ZZZX1273Wheel Blade · missingUPON COMPRESSOR DISASSEMBLY FOR OVERHAUL, FOUND ONE BLADE MISSING FROM 5TH STAGE COMPRESSOR WHEEL. BLADE APPEARS TO HAVE EXITED THROUGH BLEED VALVE AS NO DOWNSTREAM DAMAGE OCCURRED. NO IN-SERVICE DIFFICULTY WAS REPORTED. THE COMPRESSOR WHEEL EXHIBITS EVIDENSDR 99ZZZX752Pump · failedFAILED BYPASS TEST, DURING INSPECTION. PUMP WAS REPLACED. S/N T4182. CONTROL NR 98-3-4.SDR CA980521011Blade · failed(CAN) TURBINE DAMAGE DUE TO CARBON ACCUMULATION ON COMBUSTION LINER NEAR NOZZLE AND IGNITER. SUBMITTER SAYS PROBLEM CAUSED BY COMBUSTION LINE PROBLEM WHICH IS CORRECTED BY CEB 1299. PART TC: 2,028.SDR AU980780Seal · leaking(AUS) TAIL ROTOR GEARBOX INPUT SEAL LEAKING. PART TOTAL CYCLES: 15.SDR 98ZZZX1030Filter · collapsedFUEL NOZZLE FILTER IS PARTIALLY COLLAPSED DUE TO FOREIGN OBJECT INSERTED INTO INLET.SDR 98ZZZX985Filter · collapsedFUEL NOZZLE FILTER IS PARTIALLY COLLAPSED DUE TO FOREIGN OBJECT INSERTED INTO INLET.SDR 98ZZZX986Fuel Control · malfunctionedFUEL CONROL UNIT WENT FROM 63 PERCENT TO 80 PERCENT AT FLIGHT IDLE SETTING, UNCOMMANDED.SDR CA980311009Sprag Clutch · broken(CAN) SPRAG IN SPRAG ASSEMBLY FOUND TO BE CRACKED. BROKEN PIECE FOUND INSIDE SPRAG ASSEMBLY.SDR 98ZZZX1147Fuel Control · malfunctionedENGINE STILL HAVING DELAYED STARTS. ENGINE FLAMED OUT AT IDLE. RESTARTED WITH THE START PUMP ON, AND FLAMED OUT DURING THE START SEQUENCE. RESTARTED AGAIN, MADE IT TO IDLE, BUT FLAMED OUT AGAIN. REMOVED THE FUEL CONTROL AND INSTALLED A DASH 28 UNIT. NO FUSDR CA980311010Jackshaft · cracked(CAN) CRACK DETECTED VISUALLY DURING INSPECTION. CRITICAL PART. ATTACHES PILOTS COLLECTIVE STICK TO AIRFRAME.SDR 98ZZZX921Fuel Control · malfunctionedHOT START ON FIRST START OF DAY ONLY. FOUND DURING A RECEIVED TEST. FIRST 2 TEST POINTS FOUND RICH CAUSED BY LEAKING START-DERICH BELLOWS. REPLACED BELLOWS AND RETESTED.SDR 98ZZZX922Bellows · defectiveFUEL CONTROL DEFECT. UNABLE TO GET MAXIMUM SPEED; FOUND DURING TESTING. GOVERNOR SETTING 75 RPM, LOW BELOW MINIMUM.SDR CA980317056Coll Pitch Cntr · corroded(CAN) PILOT COLLECTIVE TUBE P/N 369H7354 HAD 2 AREAS OF EXCESSIVE WEAR AND ONE AREA OF EXCESSIVE CORROSION. COLLECTIVE FRICTION GRIP AREA HAD .007 WEAR AND THROTTLE FRICTION AREA HAD .008 WEAR. CORROSION WAS FOUND ON THE BOTTOM END OF TUBE WHERE TUBE FITS INTOSDR AU980262Main Rotor Sys · stoppage(AUS) MAIN ROTOR, TAIL ROTOR AND DRIVE SHAFT COMPONENTS - SUSPECT FOLLOWING DYNAMIC ROLLOVER ON 2/13/98.SDR CA980317077Snap Ring · making metal(CAN) ENGINE PRODUCING METAL CHIPS IN OIL SYSTEM AND FILTERS. NUMBER 5 BEARING SNAP RING, P/N 6726656-244 AND SPACER P/N 6848996-2 WERE FOUND LOOSE ON POWER TURBINE SHAFT.SDR CA970421049Nozzle · cracked(CAN) FUEL NOZZLE CRACKED BEYOND LIMITS. REPLACED.SDR CA970421050Stud · loose(CAN) LOOSE STUD ON ENGINE ACCESSORY DRIVE GEARBOX. REPLACED.SDR CA970421051Lead · stripped(CAN) STRIPPED THREADS ON LEAD CONNECTOR, CORROSION MAY BE CAUSE. REPLACED.SDR CA970421052Exciter · stripped(CAN) STRIPPED THREADS ON CONNECTIONS, POSSIBLY CORROSION. REPLACED.SDR CA980303005Filter · broken(CAN) ON GROUND RUN THE AIRCRAFT ENGINE QUIT. FURTHER INVESTIGATION FOUND THAT THE FUEL FILTER BOWL HAD BROKEN APART FROM THE HEAD ASSY.BY WAY OF THE CAST ASSY., WHICH HOLDS THE HELICOIL FOR THE BOWL.ONCE THE BOWL BROKE AWAY FUEL TO THE ENGINE WAS LOST.SDR 98ZZZX1026Flyweight Bush · wornPILOT EXPERIENCED DROOP OF N2 RPM (ROTOR) TO 100 PERCENT. BEEFED UP TO 102 PERCENT, THEN N2 RPM WENT UP TO 104 PERCENT. ERRATIC OPERATION NOTICED. RETURNED GOVERNOR TO REPAIR STATION FOR REPAIR AND REINSTALLED. PROBLEM CORRECTED.SDR HEEA0012986Nozzle · crackedTURBINE REMOVED DUE TO CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES TRAILING EDGE. INSTALLED A SERVICEABLE NR 1 NOZZLE.SDR HEEA0012990Nozzle · crackedENGINE REMOVED DUE TO OIL STARVATION AND METAL IN OIL. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON NR1 NOZZLE TRAILING EDGE VANES. INSTALLED A DALLAS AIRMOTIVE OVERHAULED NR1 NOZZLE.SDR HEEA0012757Nozzle · crackedTURBINE REMOVED DUE TO CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON NR 3 NOZZLE FORWARD FLANGE AND AREAS MARKED. INSTALLED A STANDARD AERO OVERHAULED NOZZLE.SDR HEEA0012758Pt Support · defectiveTURBINE REMOVED DUE TO CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: MEASURED .003 OVER SPECS (1.764-1.761) ON PT SUPPORT NR 6 DAMPER GROOVE AND CHROME FLAKING FROM NR 7 DAMPER GROOVE.SDR CA980317080Connector · burned(CAN) CARGO HOOK RELEASE CABLE BURNT THROUGH DUE TO ARCING FROM DEFECTIVE PIN IN CARGO HOOK ELECTRICAL RELEASE CONNECTOR PLUG. WIRE WAS GROUNDING OUT THROUGH CARGO HOOK.SDR 98ZZZX1250Nozzle Shield · crackedUPON DISASSEMBLY OF TURBINE FOR REPAIR DUE TO BLOWING OIL OUT OF EXHAUST, FOUND DOME AND SHIELD HAD HEAVY OIL STAINS AND DOME PART SEPARATED FROM INNER BAND AND CRACKED. SUBMITTER SUGGESTED POSSIBLY DUE TO TIGHT FIT TO NEW NR 1 FLOATING DIAPHRAGM NOZZLE AND PSDR 98ZZZX461Bearing · making metalENGINE GEARBOX BEARING RETAINER HAD FALLEN OFF DURING OPERATION AND STARTED MAKING METAL.SDR 98ZZZX506Exciter · failedIGNITION EXCITER HAD INTERNAL FAILURE, WOULD NOT EXCITE. SENT FOR REPAIR.SDR CA980122001Governor · failed(CAN) IN HOVER, N2 RPM CREEPING DOWN AND UNABLE TO REGAIN WITH BEEP SWITCH. GOVERNOR ADJUSTED BY TECHNICIAN, BUT SAME PROBLEM PERSISTED. GOVERNOR CHANGED.SDR CA980317082Tachometer · failed(CAN) ROTOR RPM WAS READING LOW BY 30-40% AT GROUND IDLE. TROUBLESHOOTING INDICATED GAUGE FAILURE.SDR AU980097Fairing · separated(AUS) MAIN ROTOR HEAD FAIRING (CHINAMANS HAT) SEPARATED FROM AIRCRAFT.SUSPECT FAIRING DEVELOPED A CRACK ALLOWING THE FAIRING TO FLEX AND LOOSEN THE ATTACHMENT SCREWS.SDR 98ZZZX500Governor · malfunctionGOVERNOR DROOPS EXCESSIVELY WHEN POWER IS APPLIED AND IS SLOW TO RESPOND.SDR HEEA0012578Nozzle · crackedENGINE REMOVED DUE TO OIL STARVATION. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON NR1 NOZZLE INNER BAND THROUGH DIAPHRAGM BRONZE FILLET AS MARKED.SDR AU980002Blade · debonded(AUS) MAIN ROTOR BLADE DOUBLER DEBONDED IN AREA OF BLADE ROOT LOWER SURFACE. DEPTH OF DEBOND 55MM (2.165IN).SDR AU980202Bearing · failed(AUS) TRANSMISSION FREE WHEEL ASSEMBLY FORWARD BEARING PNO206-040-205-005 AND SHAFT BEARING SURFACE PNO 206-040-222-005 FAILED.SDR HEEA0012543Gear Box · defectiveGEARBOX REMOVED DUE TO HIGH GEARBOX PRESSURE ON TEST CELL. VISUAL INSPECTION REVEALED: A 1/4" X 3/4" X 3/4" BLACK RUBBER MATERIAL LODGED IN GEARBOX VENT. REMOVED MATERIALSDR CA980317086Governor · malfunctioned(CAN) GOVERNOR UNABLE TO MAINTAIN HIGHER POWER DEMAND WITHOUT DROOPING.SDR HEEA0012419Internal Sump · making metalENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF TURBINE PARTS NOTED: ERODED BEYOND SERVICEABLE LIMITS ON INTERNAL SUMP SEALS AND CRACKED.SDR CA980113016Line · cracked(CAN) ENG FUEL TUBING FLARE CRACKED AND BROKEN, REPLACED.SDR CA980406020Governor · malfunctioned(CAN) WHEN MAKING BEEP ADJUSTMENTS TO GOVERNOR, ESPECIALLY AT HIGHER POWER DEMANDS, GOVENOR WILL HUNT FOR TWO OSCILLATIONS AND THEN OVERSPEED. BLUE GREASE FOUND AT SEAL DRAIN.
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