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 CA991007029Pitch Tube · chafed(CAN) DURING INSPECTION OF FLIGHT CONTROLS, A RUBBING NOISE WAS HEARD. INVESTIGATION FOUND THAT THE PITCH TUBE WAS WORN BY THE CASEY HEATER HOSE. (2.015 INCH GROOVES APPROX 3 INCHES LONG). THE TUBE WAS REPLACED AND POSTIONED CORRECTLY.SDR CA990707035Bearing · wrong part(CAN) STARTER/GENERATOR BEARINGS WERE FOUND TO NOT COMPLY WITH LUCAS SERVICE BULLETIN FOR MOD B UPGRADE REQUIREMENTS. IT IS SUSPECTED THAT THESE BEARINGS ARE NOT AN APPROVED 203PP PART.SDR CA991007030Valve · cracked(CAN) PILOT REPORTED HIGHER THAN NORMAL TOT DURING CRUISE FLIGHT. SUBSEQUENT INVESTIGATION REVEALED THE ANTI-ICE BODY HAD CRACKED OFF BETWEEN THE JAM NUT AND THE MAIN BODY. UNIT WAS REPLACED.SDR CA990318072Skin · cracked(CAN) DURING 300-HOUR INSPECTION, CRACK WAS FOUND ON TAILBOOM SKIN UNDER THE T/R COVER MOUNTING BRACKET (AFT LT SIDE). CRACK WAS APPROX .1875 INCH LONG.SDR CA991007026Actuator · intermittent(CAN) N2 BEEP CHANGES AND OPERATES INTERMITTENTLY AND JAMS AT TIMES. WHEN THE LINEAR ACTUATOR WAS REMOVED, THE CONNECTING ROD FELL OUT OF THE ACTUATOR HOUSING.SDR 99ZZZX252Bearing · damagedUPON DISASSEMBLY OF A COMPRESSOR MODULE FOR REPAIR, FOUND THE NR 1 BEARING MISSING 1 OF 8 BALLS. SUBMITTER STATED IT IS NOT KNOWN WHEN IT WAS ASSEMBLED WITHOUT ALL PARTS. REF: KES W.O. A01088.SDR 98ZZZX4816Plug · leakingEN ROUTE TO SCENE, CREW DETECTED STRONG SMELL OF FUEL. LANDED WITHOUT INCIDENT. MAINTENANCE FOUND FUEL SEEPING FROM SAFTIED PLUG ON END OF FUEL PUMP FILTER COVER. RE-TORQUED PLUG AND RE-SAFTIED. LEAK CHECKED AND RETURNED TO SERVICE. REF: ALLSION 250-C20 SDR 98ZZZX4803Turbine Rotor · failedNR 2 ENGINE OIL PRESSURE BEGAN TO FLUCTUATE IN CRUISE. LANDED WITHOUT INCIDENT. OIL LEVEL ONE AND ONE-HALF QUARTS LOW ON OIL. NO LEAKS NOTED. RE-SERVICED AND RETURNED TO SERVICE AFTER PENALTY RUN AND CHECK. FOLLOW-UP CHECK REVEALED ENGINE OIL CONSUMPTION.SDR CA981230007Support · cracked(CAN) PILOT REPORTED NOT BEING ABLE TO ADJUST CYCLIC FRICTION. THE FRICTION ADJUSTMENT WOULD TURN, BUT FRICTION WOULD NOT INCREASE. ATTEMPTS AT ADJUSTING THE MINIMUM FRICTION DID NOT WORK. WHEN REMOVING SUPPORT ASSY TO CHANGE THE FRICTION BEARING, A CRACK ISDR CA981230031Governor · malfunctioned(CAN) AT 100 PERCENT, THE RPM SURGED UP AND DOWN. THE GOVERNOR WAS REPLACED.SDR AU981417Tube · misinstalled(AUS) TAIL ROTOR PITCH CONTROL TUBE FITTED TO THE AIRCRAFT WAS A DIFFERENT PART NUMBER TO THE ONE IN THE MAINTENANCE DOCUMENTATION. PART TC: 13,461.SDR CA981125052Case · cracked(CAN) OUTER CASE OF TACHOMETER/GENERATOR FOUND CRACKED.SDR 98ZZZX4346Fuel Control · malfunctionedFUEL CONTROL SUSPECTED TO ALLOW AIR INTO FUEL SYSTEM.SDR CA981125050Indicator · reads low(CAN) TOT GAUGE READING 12 TO 14 DEGREES LOW. GAUGE REPLACED.SDR CA981125051Fcu · faulty(CAN) THE FUEL CONTROL WAS INSTALLED FOR 54.3 HOURS AND WAS ADJUSTED SEVERAL TIMES DUE TO POOR STARTING. THE UNIT WOULD WORK WELL FOR A FEW STARTS AND THEN REQUIRE RE-ADJUSTMENT. THE FUEL CONTROL UNIT WAS REPLACED.SDR CA981125049Nozzle · faulty(CAN) DURING INSPECTION, THE COMBUSTION LINER WAS FOUND TO HAVE HOT SPOTS. IT IS SUSPECTED THAT POOR SPRAY PATTERN OF THE FUEL NOZZLE CAUSED THIS PROBLEM. THE SUBMITTER STATES THAT THE FUEL NOZZLE WAS ON A TBO EXTENSION.SDR CA981125045Fcu · faulty(CAN) LIGHT OFF ADJUSTMENT WOULD NOT STAY WITHIN LIMITS DURING INSTALLATION. THE FUEL CONTROL WAS REPLACED.SDR CA981019013Switch · leaking(CAN) PRESSURE SWITCH LEAKING BETWEEN CONNECTING BOLT AND OUTER CASING. WHEN WORKING ON THE SWITCH, LIGHT CAME 'ON' AND STAYED 'ON'.SDR CA981125042Bulb · failed(CAN) LANDING LIGHT NOT OPERATING ACCORDING TO PILOT. BROKEN WIRE FOUND AT BULB. ALSO, SOME WIRES FOUND BROKEN AT THE GOVERNOR RPM SWITCH.SDR 98ZZZX3653Bearing · failedPARTIAL POWER LOSS, TOT, RISE, AND ENGINE NOISE DURING FLIGHT (LEVEL). ENGINE TEAR-DOWN REVEALED COMPRESSOR BLADES RUBBING CASE HALVES. COMPRESSOR TEAR-DOWN REVEALED NR 1 BEARING FAILURE OF BALL CAGE. SUBMITTER STATED CAUSE UNKNOWN.SDR 98ZZZX3706Combustion Case · crackedDURING DAILY INSPECTION, ARM PIT AREA OF COMBUSTION CASE FOUND CRACKED, APPROXIMATELY 2.50 INCHES LONG. PILOTS NOTED APPROXIMATELY 20 DEGREES TOT INCREASE ON THAT ENGINE ON PRIOR FLIGHT. REPLACED PART.SDR 98ZZZX4739Governor · failedWHILE PERFORMING FIRE FIGHTING FOR DNR, PILOT FILLED BUCKET AND STARTED CLIMB, ENGINE LOST POWER. PILOT DUMPED WATER WHICH BROUGHT ROTOR POWER-UP. PILOT WAS ABLE TO GET HELICOPTER TO SHORE. HELICOPTER AUTOROTATED AND STRUCK METAL TREE STAKE DAMAGING TAIL ROSDR 99ZZZX250Bearing · damagedUPON DISASSEMBLY OF A COMPRESSOR MODULE FOR OVERHAUL, FOUND THE NR 1 BEARING MISSING 2 OF 8 BALLS. SUBMITTER STATED IT IS NOT KNOWN WHEN IT WAS ASSEMBLED WITHOUT ALL PARTS. REF: KES W.O. AOD938.SDR 98ZZZX3505Seal · failedIN CRUISE FLIGHT, NR 1 ENGINE OIL PRESSURE BEGAN TO DROP. PILOT SECURED ENGINE, PROCEEDED ON TO SHORE BASE AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND OIL LEAK AT NR 6 AND NR 7 SCAVAGE STRUT. REF: ALLISON C-20 IPC, CHAPTER 72-50-00, FIGURE 1, ITEM 32.SDR 98ZZZX4741Seal · failedIN CRUISE FLIGHT, NR 1 ENGINE OIL PRESSURE BEGAN TO DROP. PILOT SECURED ENGINE, PROCEEDED ON TO SHORE BASE AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND OIL LEAK AT NR 647 SCAVAGE STRUT. REF: G-20 IPC, CHAPTER 72-50-00, FIGURE 1, ITEM 32.SDR AU981141Mount · cracked(AUS) TAIL ROTOR GEARBOX MOUNT FORGING CRACKED IN AREA OF THE LEFT REAR STUD HOLE. PART TC: 10,168.SDR 98ZZZX3646Housing · damagedOIL FITTING HAS STRIPPED THREADS IN HOUSING. REMOVED AND REPLACED.SDR CA981125043Swashplate · out of adjust(CAN) PILOT NOTED THAT HYDRAULIC OFF OPERATION WAS STIFF. SWASHPLATE FRICTION REQUIRED ADJUSTMENT. NO DAMAGE FOUND.SDR CA981125036Relay · failed(CAN) STARTER REMAINED ENGAGED WHEN ENGINE SHUT DOWN. HAD TO TURN BATTERY SWITCH OFF TO GET STARTER TO STOP.SDR CA981125038Motor · failed(CAN) DEFOG MOTOR FAILED ON TAKEOFF.SDR CA981125046Shaft · scored(CAN) DURING INSPECTION OF TAILROTOR DRIVE, THE SHORT SHAFT UNDER THE OIL COOLER WAS FOUND SCORED.SDR CA981125040Bearing · overheated(CAN) DUPLEX BEARING RUNNING HOT, SPUES VERY BLACK GREASE.SDR 98ZZZX4311Oil Pump · wornENGINE WAS REPORTED TO HAVE CAUSED SCAVENGE OIL FILTER BYPASS INDICATIONS TWO TIMES SINCE NEW. UPON DISASSEMLY OF THE OIL PUMP, FOUND IDLER GEAR, P/N 6875808, HAD WORN AWAY ALMOST HALF THE THICKNESS OF THE GEARSHAFT, P/N 6853346, AND HAD MOVED ITS LOCATION INSDR CA980908029Stiffener · failed(CAN) VERTICAL CONTROL TUNNEL AFT RIGHT STIFFENER CRACKED. BELL TB 206L-79-41 HAD NOT BEEN ACCOMPLISHED.SDR CA981001003Web · cracked(CAN) VERTICAL CONTROL ROD TUNNEL RT VERTICAL WEB CRACKED AT THE SECOND RIVET LEVEL BELOW THE MAIN BOX BEAM. BELL TB 206L-79-41 HAD NOT BEEN ACCOMPLISHED.SDR CA981001004Beam · cracked(CAN) ROOF ASSY MAIN BOX BEAM CRACKED AT THE RT CORNER ATTACHMENT OF THE VERTICAL CONTROL ROD TUNNEL. BELL T.B. 206L-79-41 HAD NOT BEEN CARRIED OUT.SDR CA981125037Valve · leaking(CAN) ENGINE FAILING THE POWER CHECKS. THE BLEED VALVE DIAPHRAGM WAS LEAKING.SDR CA980825019Trim Switch · failed(CAN) TRIM SWITCH UNIT FAILED AS THE HELO WAS TAKING OFF, UNABLE TO TRIM FORWARD CYCLIC.SDR CA980916039Tube · melted(CAN) AIRSPEED INDICATOR READING 30-40 KNOTS LOW IN CRUISE. TUBING FROM PITOT HEAD TO 'T' FITTING HAD A HOLE MELTED THROUGH FROM PROXIMITY TO LANDING LIGHT.SDR 98ZZZX3161Liner · crackedLINER HAS SEVERAL CRACKS ON LINER FINS. REMOVED FROM AIRCRAFT AND SENT FOR REPAIR.SDR 98ZZZX3358Drive Body · crackedDURING DISASSEMBLY OF FUEL CONTROL FOR REPAIR, FOUND DRIVE BODY CRACKED.SDR CA981125033Fcu · faulty(CAN) ENGINE REMAINS AT IDLE WHEN THROTTLE IS ADVANCED TO FULL POWER.SDR AU980839Trunnion · cracked(AUS) MAIN ROTOR TRUNNION CRACKED IN TWO PLACES. FOUND DURING MAGNETIC PARTICLE INSPECTION FOLLOWING HEAVY LANDING.SDR CA981030001Nozzle · cracked(CAN) INSPECTION FOUND CIRCUMFERENCE CRACKS ON THE OUTER BAND OF THE NOZZLE ASSEMBLY. NOZZLE WAS CRACKED APPROXIMATELY 75 PERCENT OF THE OUTER CIRCUMFERENCE WHERE THE OUTER BAND WAS REPLACED DURING LAST OVERHAUL. FAULT WAS FOUND DURING REPAIR OF 1ST STAGE TUSDR CA980818021Servo · failed(CAN) NEWLY INSTALLED HYDRAULIC SERVO CAUSING FEEDBACK IN CONTROLS. SERVO REPLACED AND FEEDBACK NIL.SDR CA980804010Bearing · wrong part(CAN) STARTER/GENERATOR IN SHOP FOR OVERHAUL DUE TO 'WORN BEARINGS' ON DISASSEMBLY, UNAPPROVED BEARINGS FOR THIS UNIT WERE FOUND WORN AND DRY.SDR CA980916037Blade · damaged(CAN) TAIL ROTOR BLADE STATIC STOP BUMPER CUT THROUGH. THIS BLACK COLORED BUMPER IS MUCH THINNER THAN THE ORIGINAL ORANGE/BROWN BELL MANUFACTURED BUMPER.SDR CA981125029Bumper · cut(CAN) TAIL ROTOR BUMPER CUT THROUGH AT THE TAIL ROTOR FLAP STOP CONTACT AREA.SDR CA981125030Transmission · making metal(CAN) MAIN ROTOR TRANSMISSION MAKING METAL (FLAKES). THE TRANSMISSION INCREASED 25C. SLIGHT OIL PRESSURE DECREASE.SDR CA981125031Bolt · loose(CAN) BOLT FOUND LOOSE ON ONE OF THE TRANSMISSION DECK FITTINGS. BOLT WAS TOO LONG FOR INSTALLATION.
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