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 CA980818015Governor · failed(CAN) ROTOR RPM VARIES BETWEEN 95 TO 105 PERCENT. EXCESSIVE, SLOW OR NO RECOVERY UNDER DIFFERENT FLIGHT CONDITIONS.SDR 99ZZZX233Bearing · failedFORCED LANDING AT BRIGANTINE BAY, NJ. NR 1 BEARING FAILED. NO CHIP LIGHT. COMPRESSOR ROTOR DAMAGED. PARTS OF BEARING CAGE WERE LODGED IN OIL PORT. THIS MAY HAVE STOPPED OIL SUPPLY. NO SIGN OF OIL IN BEARING AREA OR ON COMPRESSOR ROTOR. NO BALL BEARINGS SDR CA980713004Shaft · sheared(CAN) AFTER TAKEOFF, THE N2 GAS PRODUCER INDICATOR WENT TO ZERO AND ENGINE OUT LIGHT AND WARNING HORN ACTIVATED. THE TOT AND N2 ENGINE INDICATOR AND ROTOR TACHOMETER INDICATOR APPEARED NORMAL. AIRCRAFT LANDED OK. FOUND TACHOMETER GENERATOR SHAFT SHEARED. RSDR CA980818020Gear · broken(CAN) PILOT REPORTED CHIP LIGHT. INSPECITON FOUND PIECE OF GEAR TOOTH FROM THE FUEL CONTROL UNIT DRIVE TRAIN FOUND ON LOWER CHIP DETECTOR PLUG.SDR CA980629027Vane · cracked(CAN) THE FRONT FRAME SUPPORT STRUT WAS FOUND CRACKED THE FULL LENGTH OF THE TRAILING EDGE AT APPROXIMATELY 10 O'CLOCK POSITION. PART TC: 2,127.SDR 98ZZZX2592Governor · failedSLUGGISH TO RETURN TO POWER. GOV REMOVED FROM AIRCRAFT AND SENT FOR REPAIR EVALUATION.SDR 98ZZZX3361Drive Body · crackedDURING OVERHAUL (2,500 HOUR), FOUND FUEL CONTROL WITH A CRACKED MAIN DRIVE BODY.SDR CA980706019Top Case · broken(CAN) ON SCHEDULED INSPECTION, FOUND GEAR TOOTH BROKEN INSIDE OF TOP CASE. GEAR IS PART OF TOP CASE CASTING.SDR CA980707040Bearing · failed(CAN) MAIN TRANSMISSION CHIP DETECTOR. METAL FLAKES BEYOND LIMITS ON LONG MAGNETIC CHIP DETECTOR AND OIL MONITOR PLUG. SUSPECT BEARING FAILURE.SDR CA980707036Starter · failed(CAN) STARTER/GENERATOR OVERHEATING AND SMOKING ON SHUT DOWN. DRIVEN BY REVERSE CURRENT RELAY. LOAD METER, RCR AND CIRCUIT BREAKERS REPLACED.SDR CA980707033Shaft · sheared(CAN) NR N2 INDICATION. N2 TACH GENERATOR SHAFT SHEARED.SDR CA980521001Drive Shaft · failed(CAN) ON CLIMBOUT AT LOW SPEED, SUDDEN UNCONTROLLABLE YAW TO THE RIGHT. AFTER SEVERAL 360 DEGREE TURNS, AIRCRAFT SETTLED INTO TREES. NR 2 SECTION OF T/R DRIVESHAFT BONDED COUPLING FAILED. CTSB INVESTIGATING.SDR CA980707034Linear Actuator · failed(CAN) INTERMITTENT OPERATION OF ACTUATOR. WOULD NOT BEEP DOWN. TWO TERMINAL BASES LOOSE. MOTOR VERY ROUGH RUNNING.SDR 98ZZZX1981Filter · contaminatedDISCOVERED AT CLEAN AND FLOW CHECK. ITEM 1700-2000 TBO. CONTAMINATION OF FUEL NOZZLE FILTER.SDR CA980521008Tubing · melted(CAN) AIR SPEED INDICATOR SHOWING ONLY 20 KNOTS AT CRUISE. PITOT HEAD TUBING HAD BEEN INSTALLED TOO CLOSE TO LANDING LIGHT AND MELTED CAUSING LEAK.SDR 98ZZZX1936Governor · failedROTOR SPEED NR DROOPING TO 95 PERCENT AND WOULD NOT RECOVER. GOVERNOR WAS REPLACED WITH SERVICEABLE UNIT AND DROOP DID NOT RECUR.SDR CA980602046Bolt · mismanufactured(CAN) ATTEMPT TO INSTALL BOLT THROUGH SWASHPLATE DRIVE LINK LEVER ASSY FAILED DUE TO NEW BOLT BEING OVERSIZE WITH CADIUM PLATING REMOVED. BOLT ALSO EXHIBITS PITTING ON SHANK AND SEEMS TO BE MADE OF INFERIOR MATERIAL.SDR CA980922022Nut · cracked(CAN) PITCH CHANGE LINK ADJUSTER LOCKNUTS CRACKED ON MAGNETIC PARTICLE INSPECTION. SUBMITTER STATED THE VISUAL INSPECTION CALLED FOR IS NOT ADEQUATE FOR THE DEFECT FOUND HERE.SDR CA981006027Nut · cracked(CAN) PITCH CHANGE LINK ADJUSTER LOCKNUT CRACKED ON MPI.SDR CA980421007Fcu · failed(CAN) HELICOPTER IN HOVER, ENGINE DECELERATED TO IDLE. THROTTLE CONTROL IN FULL POSITION. PILOT AUTOROTATED TO RAMP. THROTTLE ROLLED BACK TO IDLE AND THEN BACK TO FULL AND ENGINE RESPONDED NORMALLY. FUEL AND AIR OF FCU AND GOVERNOR WERE LEAK CHECKED OK. FCSDR 98ZZZX1788Nozzle · crackedCRACKED DIAPHRAGM. REMOVED AND REPLACED.SDR 98ZZZX1789Nozzle · failedNR 1 BLADE PATH BREAKING OUT NOZZLE NR 2. REMOVED AND REPLACED.SDR 98ZZZX2338Turbine Suport · crackedFOUND CIRCUMFERENTIAL CRACKS IN THE POWER TURBINE SUPPORT RADIUS AREA. REPLACED TURBINE.SDR CA980602052Connector · cracked(CAN) HYDRAULIC CONNECTOR BODY CRACKED POSSIBLY FROM OVERTORQUE.SDR CA971014007Gearbox · separated(CAN) AFTER REMOVING CASEY HEATER SHROUD, THE 4.3125 INCH NUTS WERE REMOVED FROM TURBINE TO GEARBOX, LEAVING TOP .3750 INCH NUT REMAINING. AFTER TAKING WEIGHT OF TURBINE, NOTED HOW LOOSE IT WAS. TURBINE WAS REMOVED BY HAND. THE SHROUD WITH NUT WAS STILL IN TSDR CA970513023Shaft · cracked(CAN) IN-FLIGHT FAILURE OF OIL COOLER CONNECTING SHAFT.SDR CA970625001Gearshaft · cracked(CAN) SEVERAL CRACKS ORIGINATING FROM THE INNER SHOULDER AREA WORN TO APPROXIMATELY HALF THE THICKNESS FROM CONTACT WITH TORQUEMETER PISTON THRUST BEARING. THESE CRACKS RUN RADIALLY, THEN INTO THE THIRTY TOOTH GEAR, THEN AXIALLY FULL LENGTH OF THE GEAR. THE SDR 98ZZZX1272Case Half · erodedA SLIGHT RUB WAS HEARD IN THE COMPRESSOR WHEN THE N1 WAS ROTATED. UPON CASE HALF REMOVAL FOR INSPECTION, SEVERE VANE EROSION WAS FOUND. THE CHORD OF ONE VANE WAS SO THIN AS TO CAUSE THE VANE TO BEND AND RUB ON THE COMPRESSOR ROTOR. SUBMITTER SUSPECTS CASE HSDR CA980325002Cyclic Control · cracked(CAN) CRACK 1/16TH TO 1/8TH OF AN INCH FOUND ON UPPER RELIEF SLOT OF CYCLIC.SDR CA980406032Longeron · cracked(CAN) ON INSPECTION, RIGHT LONGERON CRACKED.SDR CA980406033Tunnel · cracked(CAN) AFT CROSSTUBE TUNNELS P/N 206-031-301-121 AND P/N 206-031-302-269 CRACKED IN NUMEROUS LOCATIONS.SDR CA980406034Doubler · cracked(CAN) ON REMOVAL OF FUEL CELL, FOUND BOOST PUMP ATTACH DOUBLER AND DRAIN ATTACH DOUBLER CRACKED AND HAD ENLARGED HOLES.SDR CA980406035Panel · cracked(CAN) CENTER CONSOLE LEFT HAND PANEL CRACKED ON FORWARD SIDE AND DELAMINATED ON AFT SIDE ADJACENT TO BLEED AIR HEATER DISTRIBUTION VALVES.SDR CA980311004Sensor · cracked(CAN) DURING 1200 HOUR INSPECTION AN OIL MONITOR WAS FOUND CRACKED 360 DEG. OF RADIUS BETWEEN BOLT HEAD AND SHAFT.SDR CA980313009Eductor · cracked(CAN) EXHAUST EDUCTOR CRACKED IN SEVERAL PLACES BOTH ON FORWARD AND AFT EDGES AROUND DOUBLERS.SDR CA980313008Spindle · out of adj(CAN) TAIL ROTOR HEAD ASSEMBLY FOUND TO BE INSTALLED APPROX. 10 DEGREES OUT OF ALIGNMENT IN A COUNTER CLOCKWISE DIRECTION. LACK OF MASTER SPLINE MAKES THIS MISTAKE EASILY MADE.SDR CA980225005Bearing · split(CAN) INNER RACE SPLIT ON MAIN ROTOR TRUNNION BEARING.SDR CA980406031Pump · leaking(CAN) ENGINE DRIVEN FUEL PUMP DRAIN SEAL LEAKING BEYOND LIMIT. PUMP ALSO MAKING LOUD SQUEALS DURING START-UP.SDR HEEA0013022Igniter Box · failedIGNITER BOX INTERMITTENT.SDR CA980220001Blade · corroded(CAN) MAIN ROTOR BLADES REMOVED FROM HUB FOR MAINTENANCE. BLADE BORES WERE FOUND CORRODED BEYOND LIMITS. THIS 4TH TIME AFTER BORE BUSHING CHANGES THE CORROSION HAS REAPPEARED.SDR CA980317076Switch · failed(CAN) ''G'' SWITCH FAILED CAUSING SPONTANEOUS ACTIVATION OF UNIT.SDR CA980317075Fcu · failed(CAN) ENGINE HAD HUNG START AT 25% NG. MAX LIGHT OFF TEMP AFTER FCU ADJUSTMENT OF ONE FULL TURN. FCU HAS 0.0 HOURS SINCE OVERHAUL.SDR CA980317085Fcu · out of adj(CAN) FCU RECEIVED WITH PAPERWORK TO INDICATE THE MAXIMIUM FLOW WAS SET TO 235 PPH AS PER INSTRUCTIONS. THE MAXIMUM FUEL FLOW SCREW WAS APPROX 1/16 DOWN FROM MAX MARK. CLOSER TO MAX MARK THEN MIN.SDR CA980317079Fcu · failed(CAN) ENGINE FLAMED OUT DURING START AT 55% NG AND AT 35-40% NG ON SUBSEQUENT ATTEMPT. FUEL CONTROL UNIT REPLACED.SDR CA970421038Ring Grooves · worn(CAN) FRONT SEAL RING GROOVES WORN BEYOND LIMITS.SDR 98ZZZX323Governor · failedGOVERNOR SLOW TO RESPOND TO POWER CHANGES (HIGH AND LOW SIDE).SDR CA980430001Blade · cracked(CAN) PILOT REPORTED MR VIBRATION. ENGINEER FOUND ONE CHORDWISE CRACK FROM THE BLADE SPAR TO THE TRAILING EDGE AT APPROX 90.5 INCHES FROM THE TIP.SDR HEEA0012408Fuel Pump · wornFUEL PUMP WORN DRIVE SHAFT SPLINES AND GEARS.SDR CA971231008Tube · cracked(CAN) AIR LINE FROM COMPRESSOR SCROLL TO GOVERNOR CRACKED AT FLARE AT SCROLL END. THIS CAUSED ENGINE TO GO TO IDLE.SDR CA971231009Line · leaking(CAN) FUEL NOTED DRIPPING FROM THE ENGINE COMPARTMENT OVERBOARD DRAIN. FUEL LINE BETWEEN FUEL CONTROL AND GOVERNOR LEAKING.
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