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 98ZZZX1028Engine · flamed outSHORTLY AFTER TAKEOFF, THE NR 1 ENGINE 'FLAMED OUT'. THE AIRCRAFT WAS FLOWN ON TO AIRPORT AND LANDED ON ONE ENGINE WITHOUT INCIDENT. UPON INVESTIGATION, THE FRONT SUPPORT OF NR 1 ENGINE WAS FOUND WET. THIS INDICATES WATER OR ICE WAS PRESENT IN INTAKE. AIRCSDR CA980406021Directional Gyro · overheated(CAN) COIL ON FORWARD END OVERHEATED AND FAILED CAUSING SMOKE AND FUMES IN COCKPIT.SDR CA980406022Switch · contaminated(CAN) AIRFRAME FUEL CAUTION LIGHT TEST SWITCH FAILED DUE TO FUEL LEAKAGE/CONTAMINATION IN THE ELECTRICAL PORTION OF THE SWITCH.SDR HEEA0012043Linear Actuator · failedLINEAR INDICATOR INOPERATIVE.SDR HEEA0012092Pipe · strippedCONNECTING PIPE CORRODED AND STRIPPED OUT.SDR 97ZZZX5078Gearbox · brokenENGINE HAD GEARBOX THAT HAD UPPER LEFT COMPRESSOR MOUNT BROKEN OFF. FOUND NO REASON FOR BREAKAGE.SDR CA971216001Line · broken(CAN) RIGID LINE BETWEEN BLEED VALVE AND COMPRESSOR SCROLL FITTING ALMOST BROKEN OFF.SDR CA971216041Window · separated(CAN) LEFT CHIN BUBBLE WINDOW DEPARTED AIRCRAFT SHORTLY AFTER TAKEOFF. NO DAMAGE CAUSED.SDR CA971113054Plug · worn(CAN) N1 TACH GENERATOR INDICATION INTERMITTENT. CANNON PLUG PIN WORN AND PUSHED IN.SDR CA970311071Tach Generator · failed(CAN) ENGINE OUT LIGHTS AND HORN ACTIVATED DURING FLIGHT. N1 TACHOMETER INDICTING SYSTEM NOT WORKING. TACH LATER REMOVED AND FOUND TO HAVE NO PULSE ON ROTATION.SDR CA971113053Governor · failed(CAN) ROTOR RPM DROOPS TO 98 PERCENT WITH NO RECOVERY BY GOVERNOR. UNABLE TO ADJUST TO MAINTAIN PROPER RPM. TWO PREVIOUS REMOVALS FOR SAME REASON. PART TC: 2.SDR CA971219008Blade · cracked(CAN) COMPRESSOR BLADE FOUND CRACKED AT BASE AND BLADE LEADING AGAINST NEXT BLADE. ONLY .0312 INCH HOLDING BLADE. PART TC: 13,693.SDR CA971113055Fuel Contrl Unit · failure(CAN) INSTALLED UNIT STARTS COOL AND SLOW. SUBSEQUENT START AFTER ADJUSTMENT LIGHT-OFF OCCURRED IMMEDIATELY, THROTTLE WAS IN CUTOFF POSITION. START ABORTED WITH FUEL VALVE BEING SELECTED OFF. FUEL FLOW WAS NOTED AT ALL TIMES, EVEN AT CUTOFF POSITION. FUEL SDR 97ZZZX4810Bleed Valve · stickingVALVE APPARENTLY IS STICKING IN THE CLOSED POSITION AND DOES NOT OPEN UP WHEN POWER DEMAND IS DECREASED. THIS CREATES A MOMENTARY COMPRESSOR STALL RESULTING IN GUNSHOT TYPE SOUNDS COMING FROM THE EXHAUST ON THE TURBINE.SDR CA971113052Support Assembly · corroded(CAN) SEVERE CORROSION FOUND ON AFT LOWER SIDE OF TAIL ROTOR FORWARD CONTROL ROD BELLCRANK SUPPORT.SDR CA971113042Fitting · misinstalled(CAN) SCAVENGE OIL FITTING LEAKED SINCE OVERHAUL INSTALLATION. OIL FITTING INSTALLED BACKWARDS. FITTING INSTALLED PROPERLY AND NEW SEALS INSTALLED.SDR CA971113043Fuel Contrl Unit · failure(CAN) SLOW STAGNATED STARTS. THROTTLE ADVANCE NECESSARY TO ACHIEVE GROUND IDLE. FUEL CONTROL UNIT REPLACED.SDR CA971113049Fuel Contrl Unit · failure(CAN) SLOW COOL, INTERMITTENT HUNG STARTS, IDLE INCONSISTENT, TRIM ADJUSTMENT LIMITS REACHED WITH NO EFFECT. FUEL CONTROL UNIT REPLACED.SDR CA971113051Fuel Contrl Unit · failure(CAN) EXTREMELY HOT STARTS, HANGS AT 50-55 PERCENT N1. TRIM ADJUSTMENT LIMITS REACHED WITH NO EFFECT. FUEL CONTROL UNIT REPLACED.SDR CA971015055Plate · melted(CAN) STARTER GENERATOR FRICTION PLATE MELTED INTERNALLY ON ONE SIDE, RUNNING OUTBETWEEN DAMPER PLATES.SDR CA971113048Fuel Line · cracked(CAN) FUEL LEAK FOUND WITH LINE CRACKED AT THE FLARE UNDER THE COLLAR AND "B" NUT. LINE HAD BEEN INSTALLED CORRECTLY.SDR CA970930019Packing · failed(CAN) IN HOVER, WHILE WAITING TO RELEASE EXTERNAL LOAD, ROTORCRAFT LOST POWER, AUTOROTATED AND LANDED. THE MAIN ROTOR BLADES AND SKID GEAR WERE DAMAGED BEYOND REPAIR AND SCRAPPED. AIRFRAME IS DAMAGED AND MUST BE TRANSPORTED BACK TO BASE FOR REPAIRS (ALIGNMENSDR CA970926003Tube · failed(CAN) BLEED AIR SENSE TUBE FOUND BROKEN. 15 HOURS LATER, SENSE LINE BROKE AGAIN. 25 HOURS LATER ANOTHER LINE INSTALLED. SUBMITTER SUSPECTS THAT WHEN COMPRESSOR WAS CHANGED, IT WAS SHIMMED WRONG OR THE COMPRESSOR HAD A VIBRATION CAUSING LINE TO BREAK.SDR CA971006003Stator Vane · bent(CAN) COMPRESSOR STALL OCCURRED DURING FLIGHT FOLLOWED BY HIGH T.O.T., POWER REDUCED TO LOWER T.O.T. BELOW RED LINE. ON LANDING, POWER APPLIED TO CHECK DESCENT. INVESTIGATION REVEALED DAMAGE TO STATOR VANE 4TH STAGE.SDR CA971015054Rod End · failed(CAN) LINEAR ACTUATOR ROD END WOULD NOT STAY IN WHEN SCREWED IN ACTUATOR ARM. ROD END HAD CONSIDERABLE LENGTH CUT OFF THREADED PORTION. NO PART NUMBER OR MANUFACTURER. SUSPECT UNAPPROVED PART.SDR CA971113058Blower · failed(CAN) DEFOG BLOWER MADE A CLANGING NOISE AND THEN QUIT.SDR CA971113050Fuel Contrl Unit · failured(CAN) FIRST START OF DAY IS LONG AND COOL, IDLE IS INCONSISTENT. COULD NOT ADJUST TO CORRECT. FUEL CONTROL UNIT REPLACED.SDR CA971015050Fcu · erratic(CAN) FUEL CONTROL THROTTLE RESPONSE ERRATIC AFTER IDLE. NO RESPONSE TO ADJUSTMENTS. REPLACED.SDR CA970916016Bearing · spalled(CAN) CHIP LIGHT IN FLIGHT. A/C LANDED. METAL ON PLUG. SEVERAL RUNUPS AND METAL ON PLUGS. COMPRESSOR CHANGED. NR 1 BEARING ROLLERS HAD SPALLING ON END. BEARING AND SEALS REPLACED.SDR CA971113047O-Ring · leaking(CAN) STATIC LEAK OUT OF FRONT PLUG OF FREEWHEEL. PLUG WAS REMOVED AND NEW O-RING INSTALLED. OLD RING WAS DRY AND CRACKED.SDR CA971015047Liner · cracked(CAN) CRACK FOUND IN LIP AREA CUMBUSTOR LINER ALSO MAKING HARD CONTACT WITH NOZZLE AREA.SDR CA971015046Gearbox · preloading(CAN) TAIL ROTOR GEARBOX PITCH CHANGE SHAFT PRE-LOADING TO ONE SIDE WHEN PITCH CHANGE LINKS ARE TORQUED CAUSING VIBRATION.SDR CA980713002Shaft · sheared(CAN) IN-FLIGHT, THE N1 GAS PRODUCER INDICATOR WENT TO ZERO AND ENGINE OUT LIGHT AND HORN ACTIVATED. THE TOT AND N2 ENGINE INDICATOR APPEARED NORMAL. A PAN AND EMERGENCY WAS DECLARED AND AIRCRAFT LANDED WITHOUT INCIDENT. FOUND N1 TACHOMETER GENERATOR HAD SESDR CA971015044Seal · leaking(CAN) MGB LEAKING CONTINUALLY FROM OIL SEAL. THERE WERE TWO PREVIOUS OIL SEAL REPLACEMENTS BUT OIL LEAK CONTINUED. FIRST SEAL REPLACED AT 99 HOURS AND SECOND SEAL REPLACED AT 202 HOURS.SDR CA980113001Seal · broken(CAN) PILOT REPORTED ERRATIC TORQUE INDICATIONS. GEARBOX REMOVED. PTO SEAL LIP FOUND TORN, AND PIECES OF BROKEN SEAL WERE BLOCKING TORQUE METER BLEED HOLE. THIS IS THIRD INCIDENT NOTED BY THIS O/H SHOP.SDR CA970902002Support · cracked(CAN) .25 INCH CRACK FOUND ON CYCLIC PIVOT SUPPORT. THIS ITEM USED TO BE 1,200 HOUR ZYGLO INSPECTION, BUT WAS DELETED AS A REQUIREMENT SOME YEARS AGO. FOUND BECAUSE PILOT COULD NOT TIGHTEN FRICTION ON THE CYCLIC STICK.SDR CA970904027Sensor · unserviceable(CAN) UPPER FUEL TANK SENDING UNIT STICKING.SDR CA970904028Seal · leaking(CAN) NR8 LABYRINTH SEAL LEAKING.SDR CA971015040Disc Pack · cracked(CAN) TAIL ROTOR DRIVE SHAFT FORWARD COUPLING, LOCATED IN ENGINE COMPARTMENT, 3 DISCS CRACKED DUE TO ENGINE MIS-ALIGNMENT. REPLACED.SDR CA971015039Splines · worn(CAN) METAL FOUND IN HYDRAULIC FILTER. SEVERE WEAR ON OIL PUMP SHAFT SPLINES AND ADAPTER. SUSPECT HYDRO PACK SHAFT BENT. REPLACED.SDR CA970731015Shim · incorrect(CAN) AIRCRAFT ROUGH IN HOVER AND CLUNKING NOISE HEARD ON SHUTDOWN. INSPECTION SHOWED INCORRECT SHIMMING OF STATIC STOPS ALLOWING FITTING TO ROTATE IN BORE OF YOKE WHICH POUNDED ONTO STATIC STOP, DAMAGING STATIC STOP. PROSEAL FOUND INSIDE YOKE ON RADIUS RISDR CA970904029Fuel Control · faulty(CAN) ENGINE SHUTS OFF WHEN THROTTLE IS RETARDED TO 25 DEGREES ON FCU QUADRANT. WHEN THROTTLE IS RIGGED TO IDLE AT 30 DEGREES, IT WILL GO BELOW 30 DEGREES IF THROTTLE IS ROLLED OFF ABRUPTLY.SDR CA970904031Oil Cooler · failed(CAN) ENGINE OIL TEMP RUNNING AT 100 DEGREES CELSIUS DURING CRUISE. OIL COOLER REPLACED.SDR CA970424001Roof Shell · damaged(CAN) LEFT HAND ROOF SHELL DAMAGED. AIRCRAFT TT: 14,791 HOURS.SDR CA970424002Roof Shell · damaged(CAN) FORWARD LOWER ROOF SHELL DAMAGED.SDR CA970424003Web · damaged(CAN) CANTED WEB IN BAGGAGE COMPARTMENT AREA DAMAGED.SDR CA970424004Longeron · damaged(CAN) LEFT HAND ENGINE PAN LONGERON REPLACED.SDR CA970424005Mount · damaged(CAN) FORWARD ENGINE ATTACHMENT DAMAGED. REPAIR CARRIED OUT.SDR CA970424006Support · damaged(CAN) CROSSTUBE SUPPORT STRUCTURE DAMAGED. REPAIR CARRIED OUT.SDR CA970807043Cyclic · binding(CAN) ABNORMAL CYCLIC CONTROL NOTED BY PILOT. THROTTLE CABLE IN VERTICAL TUNNEL BINDING ON CONTROL TUBES WHEN CYCLIC MOVED TO EXTREME POSITIONS.
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