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 96ZZZX5823Bearing · making metalENGINE WAS REPORTEDLY MAKING METAL. FOUND THE CAUSE TO BE THE PTO GEARSHAFT FORWARD BEARING WHICH HAD A SEVERELY SPALLED INNER RACE. THE BEARING IS AN FAA-PMA PART, MANUFACTURED BY SUPERIOR.Oct 23, 1996 · Turbine Engine Reduction GearSDR HEEA968383Gearshaft · spalledENGINE REMOVED DUE TO AFT T/M LEAK. UPON INSPECTION OF GEARBOX PARTS NOTED: SPALLING ON F/C AND O/P GEAR GEARTEETH. INSTALLED A SERVICEABLE F/C & O/P GEAR.Oct 18, 1996 · N2268X · Bell 206B · Turbine Engine Accessory DriveSDR HEEA968384Tube Assy. · out of limitENGINE REMOVED DUE TO PTO GEARSHAFT SHEARED FROM ENGINE TO TRANSMISSION. UPON INSPECTION OF GEARBOX PARTS NOTED: TUBE ASSEMBLY FAILED DIMENSIONAL CHECK PER CEB1307. INSTALLED A NEW TUBE ASSEMBLY.Oct 18, 1996 · N4294R · Bolkms BO105S · Turbine Engine Accessory DriveSDR HEEA968386Gp Support · defectiveRECEIVING INSPECTION REVEALED: .0015 OVERSIZED ON GP SUPPORT #8 BEARING BORE I.D. B/P SPECS. (1.7050 - 1.7060) REQUESTING 100% WARRANTY REPAIR PER DAVID MENARD AND ROB HALDEMAN. THIS UNIT OVERHAULED ON DALLAS AIRMOTIVE W/O LF0828.Oct 18, 1996 · N104PH · Bell 206B3 · Turbine SectionSDR HEEA968387Case Halves · crackedENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF COMPRESSOR PARTS NOTED: PLASTIC CRACKED AND LIFTING ON CASE ASSEMBLY. INSTALLED A DALLAS AIRMOTIVE OVERHAULED CASE ASSEMBLY.Oct 18, 1996 · N724MB · Bolkms BO105S · Turbine Engine Compressor SectionSDR HEEA968378Lab Seal · excess runoutRECEIVING INSPECTION REVEALED: EXCESSIVE RUNOUT ON LAB SEAL BORE. TIR .006 INSTALLED AND NOT INSTALLED IN SUPPORT. INSTALLED A NEW LAB SEAL.Oct 17, 1996 · N7136J · Bolkms BO105S · Turbine SectionSDR HEEA968222Rear Diffuser · mis mfgRECEIVING INSPECTION REVEALED: BEARING BORE UNDERSIZED MEASURED 2.165 (SPECS 2.1654 - 2.1659) ON REAR DIFFUSER.Oct 11, 1996 · N4573B · Bolkms BO105S · Turbine Engine Compressor SectionSDR HEEA968226Gearbox Cover · defectiveENGINE REMOVED DUE TO AFT T/M LEAK. UPON INSPECTION OF GEARBOX PARTS NOTED: T/M BORE TO BUSHING HAS A LINE TO LINE FIT ON COVER ASSY. INSTALLED A NEW COVER ASSY.Oct 11, 1996 · N2268X · Bell 206B · Turbine Engine Accessory DriveSDR HEEA968136Comb Liner · not weldedRECEIVING INSPECTION REVEALED: MID SKIRT NOT WELDED TO LOWER SKIRT ON COMBUSTION LINER AS MARKED. REPLACED DISCREPANT PART.Oct 4, 1996 · N5421E · Bolkms BO105S · Turbine Engine Combustion SectionSDR CA961021001Shaft · scored(CAN) TROUBLESHOOTING NR 2 ENGINE FOR REPETITIVE CHIP DETECTOR LIGHTS, ENGINE REMOVED. NR 2 1/2 BEARING IN ENGINE GEARBOX WAS FOUND TO BE FLAKING. INNER RACE OF ROLLER BEARING IS ON THE SPUR ADAPTOR GEARSHAFT AND IT WAS FOUND TO HAVE BEEN SCORED BY THE ROLLOct 2, 1996 · Turbine Engine Compressor SectionSDR CA961021002Bearing · spalled(CAN) DURING FIRST START, THE NR 2 ENGINE CHIP LIGHT ON. ENGINE SHUT DOWN. CHIP PULSE ACTIVATED AND LIGHT WENT OUT. ON NEXT START, THE CHIP LIGHT CAME ON AGAIN, ENGINE SHUT DOWN. CHIP PLUGS CHECKED AND FILTER REPLACED. IT HAD MANY FLAKES, BUT WITHIN LIMITOct 2, 1996 · Turbine Engine Reduction GearSDR 96ZZZX5503Can · crackedTURBINE 'CAN' PN 6870992 WAS FOUND CRACKED TWO TIMES IN APPROXIMATELY 100 HOURS. VIBRATION ANALYSIS SHOWED HIGH VIBRATION LEVELS, .8IPS AT 48,000 RPM (N-1 SPEED) ON THE COMPRESSOR. REPLACED COMPRESSOR AND HAVE HAD NO MORE CRACKING. NOTE: TURBINE VIBRATION Oct 1, 1996 · N493HL · Bolkms BO105CBS · Turbine Engine Compressor SectionSDR 96ZZZX5887Seal · failedDURING NORMAL CRUISE FLIGHT, PILOT NOTICED A LOW TORQUE PRESSURE INDICATION, FURTHER EXAMINATION OF ENGINE INSTRUMENTS REVEALED ENGINE OIL PRESSURE STEADILY DROPPING. PILOT PROCEEDED TO IMMEDIATELY LAND HELICOPTER. AFTER AIRCRAFT WAS SHUT DOWN PILOT FOUND OIOct 1, 1996 · N268ST · Hughes 369D · Turbine Engine Accessory DriveSDR 96ZZZX5609Fcu · failedFCU CAUSED DELAYED LIGHT-OFF WHEN AT AMBIENT TEMP. UNITS REPLACED, STARTS NORMAL.Sep 30, 1996 · N5074R · Hughes 369D · Fuel Control/Turbine EnginesSDR 96ZZZX5611Governor · erraticPILOT COMPLAINED OF ERRATIC OPERATION AND CONSTANT BEEP ADJUSTMENT. UNIT IS 344.6 HOURS SINCE REPAIR. THIS IS ANOTHER OF NUMEROUS GOVERNOR PROBLEMS.Sep 30, 1996 · N5074R · Hughes 369D · Turbine GovernorSDR CA970131001Bearing · failed(CAN) DURING GROUND RUN PROCEDURE, THE MAGNETIC CHIP DETECTOR LIGHT CAME ON. ENGINE SHUT DOWN IN NORMAL CONDITION. METALLIC PARTICLES WERE FOUND ON THE BOTTOM OF THE CHIP DETECTOR. TURBINE REMOVED AND DISMANTLED. NR 5 BEARING BALL RETAINER FOUND BROKEN. FSep 30, 1996 · Turbine SectionSDR HEEA967982Nozzle · crackedTURBINE REMOVED DUE TO CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #2 NOZZLE VANES AND DIAPRAGM.Sep 30, 1996 · N5031U · Bolkms BO105S · Turbine SectionSDR CA970311005Shut Off Cable · broken(CAN) PILOT PULLED OUT FUEL SHUT OFF KNOB AND CABLE CAME OUT FURTHER THAN NORMAL. INVESTIGATION REVEALED THAT THE CABLE HAD BROKEN AT THE VALVE END.Sep 28, 1996 · Hughes 369D · Fuel Selector/Shut-Off ValveSDR CA970311007Relay · defective(CAN) GENERATOR WOULD NOT COME ON LINE. REVERSE CURRENT RELAY CHANGED.Sep 27, 1996 · Hughes 369D · DC Generating SystemSDR CA970311050Governor · low power(CAN) GOVERNOR WOULD NOT PRODUCE MORE THAN 102 PERCENT WHEN RIGGED TO MAXIMUM.Sep 26, 1996 · Hughes 369D · Turbine GovernorSDR CA961112005Bearing · failed(CAN) DURING FLIGHT, CHIP LIGHT ILLUMINATED AND POWER LOSS OCCURRED. AUTO ROTATION CARRIED OUT.Sep 25, 1996 · Hughes 369D · Turbine SectionSDR CA960925002Bearing · cracked(CAN) INVESTIGATION REVEALED THAT THE BEARING P/N 369D25146 HAD A LONGITUDINAL CRACK ENTIRELY THROUGH THE INNER RACE. THE BEARING INNER RACE IS MOUNTED ON A PINION P/N 369D25125-13. THE RETAINING RING P/N RSN-118 CAME OFF ALLOWING THE INNER RACE TO MOVE PARTIASep 20, 1996 · Hughes 369D · Main Rotor GearboxSDR 96ZZZX5084Filter Assy · crushedPILOT EXPERIENCED N2 DROOP ON TAKEOFF WITH SLOW RECOVERY. CONDITION WORSENED DURING TROUBLESHOOTING UNTIL ENGINE WOULD NOT ACHIEVE IDLE SPEED. FUEL NOZZLE REMOVED AND DISASSEMBLED. FILTER ELEMENT FOUND CRUSHED AND TWISTED, RESTRICTING FUEL FLOW AT SPEEDS ABSep 11, 1996 · N577DB · Hughes 369E · Fuel Injector NozzleSDR CA970311015Volts Regulator · not charging(CAN) ONLY PRODUCING 25 VOLTS. GENERATOR NOT CHARGING BATTERY.Sep 9, 1996 · Bell 206B · DC RegulatorSDR CA970421036Hub · cracked(CAN) CRACKS FOUND ON RED AND GREEN LOWER LEAD LAG LINKS. CRACKS RADIATED FROM TRAILING EDGE BOLT BUSHING TO THE MIDDLE OF LINK. APPROX 2 INCHES LONG.Sep 6, 1996 · Hughes 369D · Main Rotor HeadSDR ERAA96307Nozzle · defectiveNOZZLE WAS OVERHAULED AND RET'D TO ERA 7-22-96. NOZZLE IS NOT FUNCTIONAL. COMBUSTION LINER WILL NOT INSERT TO SHIELD.Sep 6, 1996 · Bolkms BO105S · Turbine SectionSDR ERAA96301Tie Bolt Nut · defectiveOIL LEAKING PAST TIE BOLT NUT. SENDING TO EXTEX FOR EVALUATION TO DETERMINE CAUSE. OTHER PARTS AFFECTED ARE TIE BOLT P/N A23008020, S/N H144, #2 WHEEL P/N 6898782, S/N HX115226, #1 WHEEL P/N 6886407, S/N X134859, SPLINED ADAPTER, P/N6898784, S/Sep 5, 1996 · N125EH · Bolkms BO105S · Turbine SectionSDR ERAA96306Bearing · failedWAS INSPECTED BY BEARINGS INSP., INC ON W/O 17456-409 SEPT. 12, 1995 AND HAS BEEN DETERMINED TO BE BAD AND INOPERABLE.Sep 5, 1996 · N426EH · Bolkms BO105S · Turbine Engine Reduction GearSDR HEEA967782Internal Sump · defectiveUPON TURBINE ASSEMBLY NOTED: INLET AIRHOLE ON INTERNAL SUMP DOES NOT LINE UP WITH AIR HOLE IN P.T. SUPPORT. NOTE: INTERNAL SUMP TRIED ON THREE P.T. SUPPORTS. REPLACED DISCREPANT PART.Sep 4, 1996 · N911HM · Bolkms BO105S · Turbine Engine Oil SystemSDR HEEA967783Nozzle · defectiveENGINE REMOVED DUE TO UNABLE TO INSTALL 6 & 7 OIL PRESSURE NOZZLE. UPON INSPECTION OF TURBINE PARTS NOTED: EXCESSIVE RUNOUT BEYOND SERVICEABLE LIMITS ON #2 NOZZLE 1ST (.006 RUNOUT) AND 2ND (.005 RUNOUT) TIP PATHS. REPLACED DISCREPANT PART.Sep 4, 1996 · N9190Y · Bolkms BO105S · Turbine SectionSDR CA960925003Blade · delamination(CAN) 7"X14" DELAMINATION OF ABRASION STRIP ON UPPER SURFACE OF MAIN ROTOR BLADE.Aug 31, 1996 · Hughes 369D · Main Rotor BladesSDR CA960916024Connector · burnt(CAN) STARTER-GENERATOR ELECTRIC TERMINAL CONNECTOR BURNTAug 29, 1996 · Bell 206B · Starter-GeneratorSDR CA970311046Belt · damaged(CAN) PILOT HEARD GROWLING NOISE. INSEPCTION FOUND SEVERAL TEETH MISSING AND BELT CLOSE TO FAILURE.Aug 29, 1996 · Hughes 369D · Rotorcraft Cooling Fan SystemSDR HEEA967686Damper Segment · below specsRECEIVING INSPECTION REVEALED DAMPER SEGMENT LENGTH .0335 BELOW BLUE PRINT SPECS OF .542 - .544. REPLACED DISCREPANT PART WITH NO CHARGE REPLACEMENT RECEIVED FROM ALLISON.Aug 22, 1996 · Turbine Engine Compressor SectionSDR CA960827013Coupling · broken(CAN) AFTER TAKEOFF, WHEN SLING LOAD 10 FEET ABOVE GROUND, CARGO HOOK SELF RELEASED THE LOAD. COUPLING ON THE MANUAL RELEASE CABLE FOUND BROKEN. SUSPECT THAT CABLE RELEASE GETS DAMAGED BY FLYING DEBRIS WHILE LANDING WITH CARGO HOOK LOWERED FOR OPERATION.Aug 21, 1996 · Bolkms BO105C · Cargo CompartmentsSDR ERAA96297Gearbox Cover · defectiveNON SELF LOCKING INSERT NEEDS TO BE INSTALLED AT ACCESSORY LOCATION AS PER CEB-A-1226.Aug 20, 1996 · N427EH · Bolkms BO105S · Turbine Engine Reduction GearSDR ERAA96293Housing · defectiveHOUSING OVERHAULED 8/2 96. TSO -0- UNABLE TO INSTALL CHECK VALVE INTO HOUSING BORE.Aug 19, 1996 · N427EH · Bolkms BO105S · Turbine Engine Reduction GearSDR ERAA96294Housing · defectiveRETURNED FROM OVERHAUL 5-6-96 UNABLE TO PASS FLOW TEST AT 180 PPH, PSIG=118. ALLISON OVERHAUL MANUAL PAR 7-54 C. (8) PART HAS -0- TSO .Aug 19, 1996 · N427EH · Bolkms BO105S · Turbine Engine Oil SystemSDR HEEA967653Nozzle · defectiveRECEIVING INSPECTION REVEALED: MISALIGNED BEYOND SERVICEABLE LIMITS #1 NOZZLE SHIELD OUTER BAND AND DOME FLANGE AS MARKED. DOES NOT FIT ON #1 NOZZLE. REPLACED DISCREPANT PART.Aug 15, 1996 · Turbine SectionSDR HEEA967654Nozzle · defectiveENGINE REMOVED DUE TO SMOKE ON SHUTDOWN. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL (-8.4). TURBINE PRODUCED -0- POWER WITH OVERHAULED REPLACEMENT NOZZLE. REPLACED DISCREPANT PART.Aug 15, 1996 · N721MB · Bolkms BO105S · Turbine SectionSDR HEEA967647Liner · defectiveENGINE REMOVED DUE TO TURBINE OVERHAUL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL (-1.1). TURBINE PRODUCED (+3.2) POWER WITH OVERHAULED REPLACEMENT COMB LINER. REPLACED DISCREPANT PART.Aug 13, 1996 · N7136J · Bolkms BO105S · Turbine Engine Combustion SectionSDR HEEA967648Internal Sump · leakingRECEIVING INSPECTION REVEALED: LEAKING THROUGH INTERNAL SUMP GRAPHITE DURING PRESSURE CHECK. REPLACED DISCREPANT PART.Aug 13, 1996 · N7136J · Bolkms BO105S · Turbine SectionSDR HEEA967649Case · defectiveUPON TURBINE ASSEMBLY NOTED THE FOLLOWING: UNABLE TO FIT AIR TUBE RETAINING RING INTO COMB CASE RING GROOVE. REPLACED DISCREPANT PART.Aug 13, 1996 · N5421E · Bolkms BO105S · Turbine SectionSDR HEEA967650Gearbox Cover · mis mfgRECEIVING INSPECTION REVEALED: O RING GROOVE FINISH MACHINING NOT COMPLIED WITH ON GEARBOX COVER OIL SCAVENGE PORT AS MARKED.Aug 13, 1996 · Turbine Engine Accessory DriveSDR CA970311044Circuit Breaker · chafed(CAN) PILOT REPORTED SMOKE FROM AUXILIARY POWER/WATER BUCKET CIRCUIT BREAKER. CHAFED WIRE FOUND BEHIND DART PANEL.Aug 12, 1996 · Bell 206L · Emergency EquipmentSDR AU961137Governor Drive · failed shaft(AUS) ENGINE POWER TURBINE GOVERNOR DRIVE SHAFT SHEARED DUE TO FAILURE OF DRIVE BEARING SUSPECT DUE TO DETERIORATED AND/OR LOST GREASEAug 9, 1996 · Bell 206B3 · Turbine GovernorSDR HEEA967631Pto Gear · defectiveRECEIVING INSPECTION REVEALED COPPER COATING LIFTING ON P.T.O. GEAR FWD SIDE. REPLACED DISCREPANT PART.Aug 8, 1996 · N2275Y · Bell 206B3 · Turbine Engine Accessory DriveSDR HEEA967620Nozzle Vanes · crackedENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKS BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES AND CRACKED BEYOND SERVICEABLE LIMITS ON COMB. LINER SKIRT. REPLACED DISCREPANT PARTS.Aug 2, 1996 · N50293 · Bolkms BO105S · Turbine SectionSDR HEEA967621Liner · crackedENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKS BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES AND CRACKED BEYOND SERVICEABLE LIMITS ON COMB. LINER SKIRT. REPLACED DISCREPANT PARTS.Aug 2, 1996 · N50293 · Bolkms BO105S · Turbine SectionSDR HEEA967622Nozzle Vanes · crackedENGINE REMOVED DUE TO CRACKED COMPRESSOR SCROLL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND SERVICEABLE LIMITS ON NR 1 NOZZLE VANES AND EXCESSIVE RUNOUT BEYOND SERVICEABLE LIMITS OAug 2, 1996 · N54197 · Bolkms BO105S · Turbine Section
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