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.

SDR CA960212034Bellows · frozen(CAN)LEFT CYCLIC INPUT RESTRICTED DUE TO BUILD UP OF ICE ON FORWARD BELLOWS ON THE HYDRAULIC PACK INPUT ROD.Jan 12, 1996 · Bolkms BO105S · Main Rotor ControlSDR CA960312006Scavenge Pump · failed(CAN) TIME THIS INSTALLATION - 1163.3 HOURS. NORMAL START UP AND TAKEOFF UNTIL TRANSLATION WHEN TORQUE AND OIL PRESSURE GAUGES STARTED TO FLUCTUATE. IMMEDIATE LANDING AND SHUT DOWN BY PILOT. ENGINE OIL LEVEL CHECKED, NO OIL FOUND IN ENGINE OIL RESERVOIR. NO EXJan 12, 1996 · Bell 206B · Turbine Engine Oil SystemSDR 96ZZZX1039Spline Shaft · cap detachedWHILE RETURNING TO BASE DURING FLIGHT, N2 RPM DROOPED. PILOT LANDED AIRCRAFT AND REPORTED MALFUNCTION TO THE MECHANIC. UPON INSPECTION OF GOVERNOR AND ATTACHING AIR LINES, THE DRIVE SPLINE RETAINING CAP WAS FOUND DETACHED AND SMALLER SHAFT FOUND PARTIALLY FAJan 10, 1996 · N8625F · Hughes 369D · Turbine GovernorSDR 96ZZZX3731Governor · shaft separatedENGINE RPM DROOPED. REMOVED N2 GOVERNOR AND FOUND DRIVE SPLINE, SPRING AND WASHERS HAD FALLEN OFF.Jan 10, 1996 · N8625F · Hughes 369D · Turbine GovernorSDR CA960123029Turbine · seized(CAN)DURING CRUISE FLIGHT, AIRCRAFT YAWED TO THE LEFT. PILOT LOWERED THE COLLECTIVE AND OBSERVED #2 ENGINE HAD FAILED. THROTTLE SECURED, AIRCRAFT RETURNED TO BASE. INVESTIGATION REVEALED N1 GEAR TRAIN UNAB LE TO ROTATE WITH STARTER. ENGINE DISASSEMBLED, TURBINJan 10, 1996 · Turbine SectionSDR 96ZZZX432Valve · leakingANTI-ICE VALVE WAS LEAKING. FOUND THE PLUNGER WAS WORN ON ONE SIDE ALLOWING THE VALVE TO BE COCKED OFF ITS SEAT. REPLACED PART.Jan 9, 1996 · N5074R · Hughes 369D · Engine Anti-Icing SystemSDR 96ZZZX630Outlet Strainer · missingDURING ROUTINE/RECOMMENDED 1,000-HOUR INSPECTION OF THE OUTLET STRAINER ASSEMBLY, THE SCREEN WAS NOT INSTALLED, RATHER AN INLET FITTING, PN 1740235, WAS INSTALLED. THIS UNIT IS APPROXIMATELY 980 HOURS TSN. SUBMITTER RECOMMENDS COMPLETE INSPECTION OF ASSY (FIJan 8, 1996 · N911FT · Hughes 369D · Turbine Engine Oil SystemSDR HEEA966377Wheel · blade delamENGINE REMOVED DUE TO TURBINE OVERHAUL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION CAUSING DELAMINATION ON ALL 1ST STAGE WHEEL BLADES AND EROSION OF ALL LEADING EDGES. SCRAPPED 1ST STAGE WHEEL.Jan 8, 1996 · Turbine SectionSDR CA960126020Transmission · contaminated(CAN)METAL CONTAMINATION ON BOTH CHIP DETECTORS.Jan 3, 1996 · Hughes 369D · Main Rotor GearboxSDR CA960126021Indicator · sticking(CAN)INDICATOR SLUGGISH RESPONSE AND NEEDLE STICKS.Jan 3, 1996 · Hughes 369D · Engine BMEP/Torque IndicatingSDR HEEA966331Blade · delaminatedENGINE REMOVED DUE TO CYCLED OUT 2ND STAGE WHEEL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION OF 1ST STAGE WHEEL BLADES CAUSING DELAMINATION ON AFT SIDE OF LEADING EDGES. SCRAPPED 1ST STAGE WHEEL.Jan 2, 1996 · N5421E · Bolkms BO105S · Turbine SectionSDR HEEA966332Blade · delaminatedENGINE REMOVED DUE TO CYCLED OUT WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION CAUSING SLIGHT DELAMINATION ON FORWARD SIDE OF ALL 1ST STAGE WHEEL BLADES AND EROSION ON LEADING EDGE. SCRAPPED 1ST STAGE WHEEL.Jan 2, 1996 · N2285B · Bell 206B3 · Turbine SectionSDR HEEA966334Blade · delaminatedENGINE REMOVED DUE TO CYCLED OUT WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION ON ALL 1ST STAGE WHEEL BLADES CAUSING SLIGHT DELAMINATION. SCRAPPED 1ST STAGE WHEEL.Jan 2, 1996 · N105WK · Bolkms BO105S · Turbine SectionSDR HEEA966335Torquemeter · leakingENGINE REMOVED DUE TO TORQUE METER LEAKING.Jan 2, 1996 · N7170D · Bolkms BO105S · Engine BMEP/Torque IndicatingSDR 96ZZZX1167Combustion Liner · burnedWHILE REMOVING TURBINE, THE COMBUSTION LINER WAS FOUND BURNED, WARPED, AND CRACKED. PART REPLACED.Jan 1, 1996 · N5074R · Hughes 369D · Turbine Engine Combustion SectionSDR 96ZZZX2191Combustion Case · crackedWHILE IN CRUISE, PILOT NOTED ENGINE TOT WAS AT 800 DEGREES CELSIUS. MECHANIC INSPECTED ENGINE ASSY FOR EXTERNAL DAMAGE NOTING THE COMBUSTION CASE, PN 6870892-J, SN 27892, WAS CRACKED AT ARMPIT REINFORCEMENT. DURING TEAR-DOWN INSPECTION, THE FOLLOWING ITEMS WJan 1, 1996 · N121NH · Bell 206L · Turbine Engine Combustion SectionSDR 96ZZZX204Governor · defectiveGOVERNOR DROOPED TO 98 PERCENT N2 AND DID NOT RECOVER. N2 CONTINUED TO DROP WITHOUT RECOVERY. GOVERNOR ARM FELT STIFF. SENT IN FOR WARRANTY REPAIR. THE FOLLOWING ITEMS WERE REPLACED INSIDE GOVERNOR. PN 2520501, BEARING. PN 2523240, BEARING. PN 2525170, Dec 17, 1995 · N1082N · Bell 206B · Turbine GovernorSDR 96ZZZX1386Turbine · over tempDURING NORMAL SHUT DOWN, PILOT ROLLED THROTTLE TO FLIGHT IDLE, NOTICED ENGINE OUT WARNING LIGHT, N1 DECAY, BUT TOT RISING. PILOT MOTORED ENGINE, BUT TEMPERATURE EXCEEDED 1,000 DEGREES CELSIUS. AIRCRAFT RIGGING CHECKED OK. REPLACED TURBINE AND G.P. FUEL CONTDec 1, 1995 · N911FT · Turbine SectionSDR 95ZZZX6620Nozzle · crackedREPLACED NR 1 NOZZLE FOR CRACKS AND BURNING. PART SENT IN ON ALLISON 250 REPORT NR 159680.Nov 24, 1995 · N4571V · Hughes 369D · Turbine SectionSDR 95ZZZX6934Combustion Liner · crackedFOUND CRACKS IN THE 1ST SECTION CONE BEYOND LIMITS. RETURNED LINER FOR OVERHAUL ON ALLISON 250, REPORT 159678.Nov 24, 1995 · N4571V · Hughes 369D · Turbine SectionSDR 95ZZZX6935Shield · warpedDURING REPLACEMENT OF NR 1 NOZZLE, THE NR 1 NOZZLE SHIELD WAS FOUND WARPED. SENT IN FOR REPAIR ON ALLISON 250 REPORT NR A159679.Nov 24, 1995 · N4571V · Hughes 369D · Turbine SectionSDR 95ZZZX6622Turbine · nozzle crackedWHILE CHANGING NR 1 NOZZLE, IT WAS DISCOVERED THE NR 2 NOZZLE WAS CRACKED. UNIT WAS SENT IN FOR REPAIR.Nov 22, 1995 · N4571V · Hughes 369D · Turbine SectionSDR HEEA956137Servomotor · sticksSTICKING ANTI-ICE ACTUATOR.Nov 22, 1995 · N6607K · Bolkms BO105S · Engine Anti-Icing SystemSDR HEEA956080Blade · failedENGINE REMOVED DUE TO #1 BEARING OIL LEAK AND 3RD STAGE COMPRESSOR BLADE FAILURE. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: ONE EACH BLADE BROKEN OFF ON 3RD STAGE WHEEL. SECONDARY DAMAGE -- 4TH STAGE WHEEL P/N 6876654, S/N ER58760SCRAPPED DUENov 21, 1995 · N7062X · Bolkms BO105S · Turbine Engine Compressor SectionSDR HEEA956118Motor Assy · inopLINEAR ACTUATOR INOPERATIVE. REPLACED WITH SERVICEABLE ACTUATOR.Nov 21, 1995 · N3181J · Bell 206B · Engine Anti-Icing SystemSDR CA960126009Belt · worn(CAN)BELT WORN BEYOND LIMITS. 1000 HOUR NORMAL RETIREMENT LIFE.Nov 17, 1995 · Hughes 369D · Rotorcraft Cooling Fan SystemSDR CA960126010Governor · leaking(CAN)BEARING LEAKING BLUE GREASE AND FEELS ROUGH.Nov 17, 1995 · Hughes 369D · Turbine GovernorSDR CA960126011Bearing · leaking(CAN)BEARING LEAKING GREASE AND FEELS ROUGH. FCU REPLACED.Nov 17, 1995 · Hughes 369D · Fuel Control/Reciprocating EnginesSDR 95ZZZX6472Combustion Liner · crackedCOMBUSTION LINER INSPECTION FOUND CRACK ON INSIDE OF DOUBLE LIP AT 8:00 POSITION ABOUT 2.5 INCHES LONG. LINER RETURNED FOR REPAIR ON ALLISON 250. REPORT NR R159723.Nov 10, 1995 · N4571V · Hughes 369D · Turbine Engine Combustion SectionSDR 95ZZZX68831st Stage Nozzle · crackedDURING PRE-FLIGHT OF AIRCRAFT, FOUND BURNED AND CRACKED AIRFOIL VANES AND CRACKS IN OUTER BAND. PART IS SCRAPPED.Nov 9, 1995 · N2785R · Bolkms BO105S · Turbine Engine Combustion SectionSDR 95ZZZX68874th Stg Nozzle · crackedDURING PRE-FLIGHT OF AIRCRAFT, FOUND 4TH STAGE NOZZLE WITH CRACKED DIAPHRAGM.Nov 9, 1995 · N2785R · Bolkms BO105S · Turbine SectionSDR 95ZZZX6323Case Half · crackedINSPECTED CASE HALVES AT ANNUAL, FOUND PLASTIC CRACKED BEYOND LIMITS WITH SOME MATERIAL MISSING.Nov 3, 1995 · N4571V · Hughes 369D · Turbine Engine Compressor SectionSDR CA951122009Nozzle · below specfs(CAN)POWER CHECKS BELOW SPECS. TURBINE ASSEMBLY REPLACED. AIRCRAFT RETURNED TO SERVICE.Nov 3, 1995 · Bell 206L · Turbine SectionSDR HEEA955927Bearing · failedENGINE REMOVED DUE TO #1 BEARING FAILURE. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: #1 BEARING SEPARATOR BROKEN INTO MANY PIECES, INNER AND OUTER RACE SPALLED, BEARING BALLS SCORED AND FLATTENED. SECONDARY DAMAGE - MUTE RUB ON 1STSTAGE WHEELOct 27, 1995 · N3181Y · Bell 206B · Turbine Engine Compressor SectionSDR 95ZZZX6197Nozzle · defectivePILOT COMPLAINED OF POWER/N2 FLUCTUATING WITH COLLECTIVE INPUT. SUBSEQUENT INSPECTION REVEALED THE FUEL NOZZLE WAS AT FAULT. REMOVED AND REPLACED NOZZLE AND PROBLEM WAS CURED. NOZZLE SENT IN FOR REWORK.Oct 19, 1995 · N3115Y · Hughes 369D · Fuel Injector NozzleSDR 95ZZZX6240Bleed Valve · sticksPILOT COMPLAINED THE POWER CHECK WAS INCONSISTENT. SUBSEQUENT INSPECTION REVEALED THE BLEED VALVE WAS STICKY. UNIT SENT IN FOR REPAIR ON ALLISON 250 REPORT NR A159719.Oct 16, 1995 · N4571V · Hughes 369D · Compressor Bleed ValveSDR 95ZZZX6198Combustion Case · crackedINVESTIGATION FOR LOSS OF POWER AND HIGH T.O.T., FOUND COMBUSTION CASE CRACKED.Oct 5, 1995 · N781LL · Bell 206L · Turbine Engine Combustion SectionSDR 95ZZZX6243Seal · leakingINSTALLED NEW SEAL AFTER INSPECTION OF UNIT. STARTED LEAKING OIL AFTER VERY LITTLE TIME IN SERVICE. SUBMITTER STATED BELL SEEMS TO HAVE CHANGED MANUFACTURERS. SEAL IS GARLOCK TYPE, BUT BLACK INSTEAD OF USUAL ORANGE COLOR. APPEARS TO BE OF DIFFERENT MATERIASep 22, 1995 · N167BH · Bell 206B · Engine/Transmission CouplingSDR 95ZZZX6204Bearing · making metalBEARING MAKING METAL. REPLACED WITH NEW UNIT(S), CORRECTED PROBLEM.Sep 11, 1995 · N911BH · Bolkms BO105CBS · Turbine Engine Compressor SectionSDR 95ZZZX5912Bearing · making metalINSPECTED AIRFRAME SCAVENGE OIL FILTER PER SUPERIOR TURBINE INFORMATION BULLETIN NR 95-IB001 (SB T95-SB001). FOUND 13 SILVER FLAKES IN FILTER BOWL. NO ABNORMAL INDICATIONS OR CHIP LIGHTS. REPLACED WTIH NEW SERVICEABLE BEARING. SUPERIOR TURBINE OFFERED EXCESep 10, 1995 · N105NC · Bolkms BO105CBS · Turbine SectionSDR HEEA955670Switch · malfunction#2 ENGINE DIFFERENTIAL PRESSURE SWITCH WOULD NOT FUNCTION CHECK AS PER BO-105 M & O CHAPTER 62 PAGE 43 PARA. 62-39 ITEM #2. REPLACED DIFFERENTIAL PRESSURE SWITCH.Aug 31, 1995 · N91070 · Bolkms BO105S · Fuel Pressure IndicatingSDR 96ZZZX616Fuel Control · failureFAILURE OF DRIVE BEARINGS AND DAMAGE TO INTERNAL FLYWEIGHTS AND HOUSING CAUSED HIGH END TURBINE RUNAWAY RESULTING IN ENGINE OVERSPEED.Aug 29, 1995 · N50054 · Bell 206B3 · Fuel Control/Turbine EnginesSDR 95ZZZX5540Governor · failedWHILE IN CRUISE FLIGHT, THE PILOT NOTICED A DECREASE IN MAIN ROTOR RPM AND THE NOSE OF THE HELICOPTER NOTICEABLY YAWED. THE PILOT DECREASED COLLECTIVE PITCH, BUT THE ENGINE POWER AND ROTOR RPM CONTINUED TO DECREASE. THE ENGINE DID NOT FAIL COMPLETELY. DURINAug 24, 1995 · N8639F · Hughes 369D · Turbine GovernorSDR 95ZZZX5541Fuel Control · faultyWHILE IN CRUISE FLIGHT, THE PILOT NOTICED A DECREASE IN MAIN ROTOR RPM AND THE NOSE OF THE HELICOPTER NOTICEABLY YAWED. THE PILOT DECREASED COLLECTIVE PITCH, BUT THE ENGINE POWER AND ROTOR RPM CONTINUED TO DECREASE. THE ENGINE DID NOT FAIL COMPLETELY. DURINAug 24, 1995 · N8639F · Hughes 369D · Fuel Control/Turbine EnginesSDR 95ZZZX5539Fuel Control · malfunctionFUEL CONTROL WILL NOT RESPOND PROPERLY TO ADJUSTMENTS FOR START TEMPS. START TEMPS GO EITHER HOT OR COLD IN AN ERRATIC MANNER. RETURNED CONTROL FOR BENCH CHECK.Aug 14, 1995 · N603RA · Hiller UH12E · Fuel Control/Turbine EnginesSDR 95ZZZX5213Bearing · making metalBEARING WAS PURCHASED AS PMA PART FROM SUPERIOR TURBINE. AN INFORMATION LETTER FROM SUPERIOR DATED MAY 1, 1995, RECOMMENDED INSPECTION OF BEARING AND FILTER FOR METAL FLAKES. THIRTEEN PIECES FOUND IN FILTER, ONE WAS 'TRIANGULAR 2 X 4MM', SINCE TWO SB HAVE BEAug 8, 1995 · N105NC · Bolkms BO105CBS · Turbine SectionSDR HEEA955576Wheel · sulfidationENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MILD SULFIDATION OUT OF OVERHAUL MANUAL LIMITS ON ALL 1ST STAGE TURBINE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.Aug 8, 1995 · N7136H · Bolkms BO105S · Turbine SectionSDR 95ZZZX4279Governor · erraticGOVERNOR IS ERRATIC WITH ANY POWER CHANGE. UNIT REMOVED AND SENT IN FOR REPAIR ON ALLISON 250 REPORT NR A151615.Aug 5, 1995 · N4282X · Hughes 369D · Turbine GovernorSDR CA960212027Nozzle · carbon buildup(CAN)DURING FLIGHT, AT ABOUT 150' AGL, THE ENGINE FLAMED OUT AND THEN RELIT, HOWEVER THE ENGINE RPM ONLY REACH 30 PERCENT NG. THE PILOT CARRIED OUT AN AUTOROTATION. THE AIRCRAFT WAS FITTED WITH FLOAT GEAR.DURING THE FLARE AND RUN-ON LANDING, THE TAIL SKID CONTAug 4, 1995 · Bell 206L · Fuel Injector NozzleSDR 95ZZZX4037Turbine · locked-upN2 LOCKED UP. UNIT SENT IN FOR SAME PROBLEM 356.7 HOURS AGO. REMOVED SN CAT 33968 AND SENT TO BE REPAIRED ON ALLISON REPORT NR A160209.Aug 2, 1995 · N4282X · Hughes 369D · Turbine Section
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