Allison 250-C30

Service difficulty reports · 402

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 = '250C30'
  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.

SDR 98ZZZX3157Spline Adapter · mismanufacturedPERFORMED TOLERANCE INSPECTION PER OVERHAUL MANUAL. FOUND OUTSIDE DIAMETER UNDERSIZED (.9850 INCH). RECEIVED FROM ALLISON NEW. FOUND OUTSIDE DIAMETER ON SPLINE ADAPTER MANUFACTURED UNDERSIZED. ACTUAL MEASUREMENT WAS .9850 INCH.Jun 23, 1998 · Turbine Engine Compressor SectionSDR 98ZZZX3158Seal Kit · leakingUPON ASSEMBLY, PRESSURED UP NR 1 SEAL AREA WITH ENGINE OIL TO CHECK FOR LEAKAGE AND FOUND SEAL WOULD NOT HOLD (EXCESSIVE LEAKAGE PAST SEAL). SUSPECT HEIGHT OF CARBON SEAL TOO LOW TO SEAL PROPERLY AGAINST MATING RING.Jun 23, 1998 · Turbine Engine Compressor SectionSDR CA980529001Pump · noisy(CAN) PILOT REPORTED A MINOR WEEP AND TICKING NOISE FROM HYDRAULIC PUMP. WHEN HELICOPTER SHUT DOWN THE RETURN LINE FILTER BYPASS TELL-TAIL WAS POPPED. IT WAS RESET AND AIRCRAFT STARTED, RAN AGAIN WITH SAME RESULT. BRASS FOUND IN HYDRAULIC FLUID ORIGINATINGMay 9, 1998 · Bell 206L1 · Hydraulic Pump (Electric/Engine), MainSDR 98ZZZX2537Valve Sleeve · failedDURING OVERHAUL OF FUEL CONTROL, FOUND BONDING MATERIAL ON VALVE SLEEVE BROKEN.May 5, 1998 · N5427S · Skrsky S76A · Fuel Control/Reciprocating EnginesSDR HEEA0014051Fuel Control · malfunctionedFUEL CONTROL MALFUNCTION. WILL NOT TOP. DROOPS AT 90 PERCENT TORQUE. UNIT HAS EXPERIENCED STARTING PROBLEMSApr 29, 1998 · N706AE · Skrsky S76A · Fuel Control/Reciprocating EnginesSDR 98ZZZX1822Fuel Control · defectiveFUEL CONTROL OUT OF STOCK OVERHAUL. ENGINE WOULD NOT GO ABOVE 30 PERCENT OR 500 DEGREES CELSIUS. HANGS. REMOVED AND REPLACED.Mar 30, 1998 · Skrsky S76 · Fuel Control/Turbine EnginesSDR HEEA0013455Governor · mis repairedRECEIVED FROM STOCK. WHEN WOOD BLOCK REMOVED FOUND CIRCLIP LAGGING IN BLOCK. NEVER INSTALLED ON AIRCRAFT. INSPECTED GOVERNOR WHEN RECEIVED IN SHOP. FOUND DRIVE COUPLING ON DRIVE SHAFT TO STILL HAVE 934 BONDING AND IN GOOD SHAPE. INSPECTED SUSPECTED CLIP REMar 19, 1998 · Turbine GovernorSDR HEEA0013024Exciter · failedEXCITER WILL NOT FIRE IGNITION PLUGS.Feb 11, 1998 · N5128 · Skrsky S76A · ExciterSDR AU971655Cover · broken(AUS) ENGINE NO3 AND NO4 BEARING HOUSING BROKEN AT PREVIOUSLY REPAIRED AREA. ENGINE WAS BEING OVERHAULED FOLLOWING AND ENGINE FAILURE WHICH RESULTED IN A HARD LANDING AND SUDDEN STOPPAGE. ENGINE IS FROM A PNG REGISTERED AIRCRAFT P2-HBB.Dec 11, 1997 · Turbine Engine Reduction GearSDR 98ZZZX336Bleed Valve · failedENGINE HAD COMPRESSOR STALL AT LOW POWER. REMOVED AND REPLACED BLEED VALVE.Nov 17, 1997 · N721SP · Bell 206L · Compressor Bleed ValveSDR AU971487Drive Belt · loose(AUS) HYDRAULIC PUMP DRIVE BELT LOOSE. SEE MDR 97/1319 FOR ADDITIONAL INFORMATIONOct 18, 1997 · Snias AS350D · Hydraulic Pump (Electric/Engine), MainSDR HEEA0010853Pump · wornFOUND PUMP DRIVE SHAFT AND SPLINES TO HAVE EXCESSIVE WEAR AND PITTING.Aug 21, 1997 · N4253S · Skrsky S76A · Engine Fuel PumpSDR AU970663Nut · separated(AUS) NO2 ENGINE GEARBOX 2.5 BEARING SUPPORT RETENTION NUTS (2OFF6) MISSING - NUTS WERE EVENTUALLY FOUND IN THE OIL PUMP SCAVENGE LINE - NUTS WERE NOTED TO BE OF AN UNUSUAL TYPE - SUSPECT UNAPPROVRD PARTMay 21, 1997 · Skrsky S76A · Turbine Engine Accessory DriveSDR AU970495Seal · failed(AUS) NO2 ENGINE ACCESSORY GEARBOX OIL COOLER BLOWER DRIVE SEAL FAILED- LOSS OF ENGINE OILMay 14, 1997 · Skrsky S76A · Turbine Engine Accessory DriveSDR 97ZZZX2756Governor · malfunctionUNRESPONSIVE AT HIGH TORQUE RANGES. SHAFT RATCHETY AND STIFF. REPLACED GOVERNOR.May 7, 1997 · N5402T · Skrsky S76 · Turbine GovernorSDR AU970229Support · cracked(AUS) TAIL ROTOR CONTROL PEDAL CENTRE SUPPORT CRACKED AT THE UPPER SUPPORT TUBE WELDED JOINTMar 14, 1997 · Skrsky S76A · Tail Rotor Control SystemSDR CA970407015Brake · frozen(CAN) DURING NORMAL SHUTDOWN, A/C STARTED TO ROLL BACKWARDS. FULL BRAKES APPLIED, BUT A/C CONTINUED TO TURN. SUSPECT BRAKES FROZE AFTER BEING PULLED FROM HANGAR IN THE MORNING THROUGH SNOW.Mar 14, 1997 · Skrsky S76A · BrakeSDR HEEA978989Bleed Valve · defectiveLOW POWER. BLEED VALVE DEFECTIVE.Feb 10, 1997 · N911MJ · Skrsky S76A · Compressor Bleed ValveSDR CA961216004Driveshaft · teeth missing(CAN) MAIN DRIVESHAFT INSPECTED DURING 300 HOUR INSPECTION. 7 OUT OF 34 TEETH ON OUTPUT SPLINE TO MAIN TRANSMISSION FOUND CRACKED.Nov 20, 1996 · Hughes 369FF · Main Rotor GearboxSDR 97ZZZX97Nozzle Shield · damagedTHE NR 2 ENGINE FIRST STAGE TURBINE NOZZLE SHIELD WAS FOUND TO HAVE AN .8750 INCH BY 1.75 INCH SECTION MISSING AT THE 6 O'CLOCK POSITION. THIS DEFECT WAS FOUND DURING A ROUTINE INSPECTION. IT WAS SEEN THROUGH THE FUEL NOZZLE MOUNTING HOLE. AFTER REMOVAL OFNov 7, 1996 · N5447C · Skrsky S76 · Turbine SectionSDR HAI00000088Seal · tornSEAL IS TORN. REPLACED WITH NEW SEAL FROM CSF STOCK.Oct 18, 1996 · Turbine Engine Reduction GearSDR HEEA967693Liner · mis mfgRECEIVING INSPECTION REVEALED: ALIGNMENT 1/2 HOLE OFF TO RIGHT ON COMB LINER PIN. LINER TRIED ON SEVERAL TURBINES AND UNABLE TO INSTALL FUEL NOZZLE WITH IGNITOR AND DUMMY PLUG IN PLACE. UNABLE TO INSTALL IGNITOR PLUG WITH FUEL NOZZLE AND DUMMY PLUG INSTALLEDAug 26, 1996 · N108PH · Bell 206L3 · Turbine Engine Combustion SectionSDR AU961112Turbine Bolt · loose nut(AUS) GAS PRODUCER TURBINE BOLT NUT LOOSEJul 22, 1996 · Turbine SectionSDR AU960960Liner · failed(AUS) ENGINE COMBUSTION LINER FAILED - SPACER CLIPS (6OFF) PNO 23003111SEPARATED FROM LINER PRIMARY SECTION PNO 23004562 AT THE VACUUM BRAZED JOINT ALLOWING THE WATER SHIELD TO SEPARATE FROM THE LINER AND AT LEAST ONE CLIP TO CONTACT THE TURBINE CAUSING FOD - Jun 26, 1996 · Snias AS350B · Turbine Engine Combustion SectionSDR AU960835Liner · failed(AUS) ENGINE COMBUSTION ASSEMBLY AIR SURROUND TO COMBUSTION LINER ATTACHMENT SADDLES (3OFF) FAILED AT WELDS - SADDLES WERE INGESTEDTHROUGH THE ENGINEJun 6, 1996 · Snias AS350B · Turbine Engine Combustion SectionSDR AU961156Seal · leaking(AUS) FUEL SELECTOR VALVE SHAFT SEAL LEAKING ALLOWING AIR TO ENTER FUELSYSTEMMay 25, 1996 · Skrsky S76A · Fuel Selector/Shut-Off ValveSDR 96ZZZX2899Nozzle Shield · crackedDURING REPAIR OF THE TURBINE, NOTED THE DEFLECTOR ON THE FIRST STAGE NOZZLE SHIELD WAS BURNED. CLOSER EXAMINATION REVEALED 2 CRACKS IN THE DOME DETAIL. THE DOME WAS CHECKED FOR PROPER MATERIAL PER DEB A-72-3208 AND WAS FOUND TO CONFORM. SUSPECT THE CAUSE COUMay 13, 1996 · Turbine SectionSDR AU960634Chip Detector · contam-metal(AUS) ENGINE CHIP DETECTOR CONTAINED A FINE SLIVER OF METAL - CHIP DETECTOR WAS CLEANED AND AN ENGINE SERVICEABILITY CHECK WASPERFORMED - NO FURTHER CONTAMINATION WAS FOUND AND AIRCRAFT RETURNED TO SERVICEMay 4, 1996 · Skrsky S76A · Turbine Engine Oil SystemSDR 96ZZZX25212nd Stg Nozzle · diaphragm looseUPON RECEIVING FROM ALLISON (NEW) 3-8-96, NOZZLE HAD A DIAPHRAGM MOVEMENT OF .004 INCH. ACCORDING TO CEB-3188, THE DIAPHRAGM SHOULD HAVE A MAXIMUM MOVEMENT OF .003 INCH. THIS NOZZLE IS UNACCEPTABLE AND WAS SENT BACK TO ALLISON FOR WARRANTY. TIGHTENED THE KEApr 4, 1996 · Turbine SectionSDR 96ZZZX25222nd Stg Nozzle · diaphragm looseUPON RECEIVING FROM ALLISON (NEW) 3-5-96, NOZZLE HAD A DIAPHRAGM MOVEMENT OF .005 INCH. ACCORDING TO CEB-72-3188, THE DIAPHRAGM SHOULD HAVE A RADIAL MOVEMENT OF .003 INCH MAXIMUM. THE NOZZLE WAS SENT BACK TO ADDISON FOR WARRANTY. TIGHTENED THE KEYS ON THE DApr 4, 1996 · Turbine SectionSDR 96ZZZX25232nd Stg Nozzle · diaphragm looseUPON RECEIVING FROM ALLISON (NEW) 3-5-96, NOZZLE HAD A DIAPHRAGM MOVEMENT OF .005 INCH. ACCORDING TO CEB-72-3188, THE DIAPHRAGM SHOULD HAVE A MAXIMUM MOVEMENT OF .003 INCH. THE NOZZLE WAS SENT BACK TO ALLISON FOR WARRANTY. TIGHTENED THE KEYS ON THE DIAPHRAGMApr 4, 1996 · Turbine SectionSDR 96ZZZX25242nd Stg Nozzle · diaphragm looseUPON RECEIVING FROM ALLISON (NEW) 3-8-96, NOZZLE HAD A DIAPHRAGM MOVEMENT OF .004 INCH. ACCORDING TO CEB-72-3188, THE DIAPHRAGM SHOULD HAVE A MAXIMUM MOVEMENT OF .003 INCH. THIS IS UNACCEPTABLE. THE NOZZLE WAS SENT BACK TO ALLISON FOR WARRANTY. TIGHTENED TApr 4, 1996 · Turbine SectionSDR 96ZZZX4704Gearbox · corrodedPITTED CORROSION ON RT GEARBOX BOSS OCCURRED DURING NORMAL OPERATION. FOUND DURING ROUTINE INSPECTION. RECOMMENDED SUPPLIER CHECK MATERIALS FOR DEFECTS. SIMILAR PROBLEM FOUND ON THREE GEARBOXES.Mar 22, 1996 · N722H · Bell 206L3 · Turbine Engine Reduction GearSDR HEEA966861Gearshaft · stepwearENGINE REMOVED DUE TO TURBINE WHEEL HIGH CYCLES. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: STEP WEAR BEYOND LIMITS ON SPUR ADAPTER GEARSHAFT FWD AND AFT SPLINES. NEW PART INSTALLED.Mar 19, 1996 · N3122H · Skrsky S76A · Turbine Engine Compressor SectionSDR AU960442Oil Jet · unapproved part(AUS) DURING ENGINE INSPECTION FOLLOWING AN AIRCRAFT WIRE STRIKE, THE PINION OIL NOZZLE WAS FOUND TO BE THE INCORRECT PART NUMBER ITEM FOR THE TURBINE TO GEARBOX CONFIGURATION - THE TURBINE HAD BEEN MODIFIED IAW ALLISON 250C30 SBS 72-3158 AND 72-3193 - THE OILFeb 12, 1996 · Snias AS350B · Turbine Engine Accessory DriveSDR 96ZZZX746Fuel Control · water contamDURING FLIGHT CHECK/HOVER, COMPRESSOR STALLED. REMOVED FROM ENGINE, INSPECTED PX-AIR CIRCUIT ON FUEL CONTROL, FOUND EXCESSIVE AMOUNT OF WATER.Jan 4, 1996 · N701AL · Skrsky S76 · Fuel Control/Turbine EnginesSDR HEEA956220Solenoid · defectiveINTERMITTENT IDLE STOP.Dec 11, 1995 · N230UN · Bell 230 · Fuel Controlling SystemSDR 96ZZZX743Housing · unbondedUPON DISASSEMBLY OF THE ENGINE, FOUND BRONZE PLATING UNBONDING AT COMP. BORE. ALSO, FOUND T/M HELICOIL DAMAGED. THE CAUSE FOR BRONZE PLATING UNBONDING IS DUE TO THE SURFACE CORROSION ON HOUSING AND OIL ACCUMULATION. THE CAUSE FOR T/M HELICOIL DAMAGE IS DUE Sep 29, 1995 · N346AL · Bell 206L3 · Turbine Engine Reduction GearSDR HEEA955678Bellcrank · wornWORN BEARING AND STIFF (BEARING HAD FROZE UP)Aug 31, 1995 · N230UN · Bell 230 · Engine Fuel and ControlSDR HEEA955575Tube Assy · cracked#2 ENGINE N1 NOT ADVANCING WITH THROTTLE INPUT. UPON TROUBLESHOOTING NOTED THE FOLLOWING: CRACKED TUBE ASSY APPROXIMATELY 270 DEGREES AROUND FERRULE MATING SURFACE AT GOVERNOR END. SCRAPPED TUBE ASSEMBLY AND INSTALLED NEW TUBE ASSY.Aug 8, 1995 · N230UN · Bell 230 · Fuel Controlling SystemSDR HEED95299Valve · sticksSTICKS IN NORM POSITION CAN NOT SWITCH FCU TO ECONOMY MODE. REPLACE UNITJul 12, 1995 · N236X · Bell 230 · Fuel Control/Turbine EnginesSDR 95ZZZX5087Solenoid · defectiveSOLENOID DOES NOT WORK CONSISTENTLY. IT SOMETIMES DOES NOT OPEN AND SOMETIMES DOES NOT CLOSE.May 17, 1995 · N230TX · Bell 230 · Fuel Controlling SystemSDR 95ZZZX5086Solenoid · defectiveSOLENOID DEFECTIVE. NEW SOLENOID INSTALLED.Apr 25, 1995 · N230TX · Bell 230 · Fuel Controlling SystemSDR HEED95157Actuator · failedACTUATOR FAILED TO RESPOND TO SWITCH. ORDERED NEWApr 25, 1995 · N236X · Bell 230 · Main Rotor ControlSDR 95ZZZX2089Screw · failedON DAILY SERVICE CHECK, FOUND INBOARD SCREW WHICH SECURES BYPASS VALVE RETAINING PLATE TO THE FUEL CONTROL BODY WAS FOUND WITH HEAD BROKEN OFF. CAUSE UNKNOWN. COMPLETE FUEL CONTROL WITH BROKEN SCREW WAS SENT TO ALLIED SIGNAL - BENDIX FOR EVALUATION. CEB'S 7Mar 29, 1995 · N358AL · Bell 206L3 · Fuel Control/Turbine EnginesSDR HEEA954643Actuator · inoperativeACTUATOR INOPERATIVE; NO MOVEMENT OF MOTOR.Mar 28, 1995 · N230UN · Bell 230 · Main Rotor ControlSDR HEEA954594Shaft Seal · leakingLEAK AT STARTER GENERATOR SEAL. REPLACED WITH SERVICEABLE SEAL.Mar 23, 1995 · N230UN · Bell 230 · Turbine Engine Oil SystemSDR HEEA954546Linear Actuator · inoperativeBEEP MOTOR INOPERATIVE.Mar 17, 1995 · N3116P · Bell 206L3 · Fuel Controlling SystemSDR 95ZZZX1853Pc Filter · unbondedDURING PHASE INSPECTION, FOUND FILTER LOOSE IN FILTER BOWL. FILTER ELEMENT WAS UNBONDED FROM FILTER CAP. CAUSE UNKNOWN.Mar 8, 1995 · N170AL · Bell 206L4 · Engine Fuel DistributionSDR HEEA954411Body · mis mfgRECEIVING INSPECTION OF NEW, NEVER INSTALLED BLEED VALVE BODY INDICATED PORT HOLE FOR ORIFICE P/N 23003102-01 IS IMPROPERLY MACHINED WITHOUT THREADS. INSTALLED NEW BLEED VALVE BODY.Feb 24, 1995 · N5427S · Skrsky S76A · Compressor Bleed Valve
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