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.
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
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 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.SDR 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.SDR 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.SDR 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.SDR 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.SDR 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.SDR HEEA968222Rear Diffuser · mis mfgRECEIVING INSPECTION REVEALED: BEARING BORE UNDERSIZED MEASURED 2.165 (SPECS 2.1654 - 2.1659) ON REAR DIFFUSER.SDR 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.SDR HEEA968136Comb Liner · not weldedRECEIVING INSPECTION REVEALED: MID SKIRT NOT WELDED TO LOWER SKIRT ON COMBUSTION LINER AS MARKED. REPLACED DISCREPANT PART.SDR 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 ROLLSDR 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 LIMITSDR 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 SDR 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 OISDR 96ZZZX5609Fcu · failedFCU CAUSED DELAYED LIGHT-OFF WHEN AT AMBIENT TEMP. UNITS REPLACED, STARTS NORMAL.SDR 96ZZZX5611Governor · erraticPILOT COMPLAINED OF ERRATIC OPERATION AND CONSTANT BEEP ADJUSTMENT. UNIT IS 344.6 HOURS SINCE REPAIR. THIS IS ANOTHER OF NUMEROUS GOVERNOR PROBLEMS.SDR 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. FSDR HEEA967982Nozzle · crackedTURBINE REMOVED DUE TO CYCLES. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #2 NOZZLE VANES AND DIAPRAGM.SDR 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.SDR CA970311007Relay · defective(CAN) GENERATOR WOULD NOT COME ON LINE. REVERSE CURRENT RELAY CHANGED.SDR CA970311050Governor · low power(CAN) GOVERNOR WOULD NOT PRODUCE MORE THAN 102 PERCENT WHEN RIGGED TO MAXIMUM.SDR CA961112005Bearing · failed(CAN) DURING FLIGHT, CHIP LIGHT ILLUMINATED AND POWER LOSS OCCURRED. AUTO ROTATION CARRIED OUT.SDR 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 PARTIASDR 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 ABSDR CA970311015Volts Regulator · not charging(CAN) ONLY PRODUCING 25 VOLTS. GENERATOR NOT CHARGING BATTERY.SDR 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.SDR ERAA96307Nozzle · defectiveNOZZLE WAS OVERHAULED AND RET'D TO ERA 7-22-96. NOZZLE IS NOT FUNCTIONAL. COMBUSTION LINER WILL NOT INSERT TO SHIELD.SDR 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/SDR ERAA96306Bearing · failedWAS INSPECTED BY BEARINGS INSP., INC ON W/O 17456-409 SEPT. 12, 1995 AND HAS BEEN DETERMINED TO BE BAD AND INOPERABLE.SDR 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.SDR 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.SDR CA960925003Blade · delamination(CAN) 7"X14" DELAMINATION OF ABRASION STRIP ON UPPER SURFACE OF MAIN ROTOR BLADE.SDR CA960916024Connector · burnt(CAN) STARTER-GENERATOR ELECTRIC TERMINAL CONNECTOR BURNTSDR CA970311046Belt · damaged(CAN) PILOT HEARD GROWLING NOISE. INSEPCTION FOUND SEVERAL TEETH MISSING AND BELT CLOSE TO FAILURE.SDR 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.SDR 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.SDR ERAA96297Gearbox Cover · defectiveNON SELF LOCKING INSERT NEEDS TO BE INSTALLED AT ACCESSORY LOCATION AS PER CEB-A-1226.SDR ERAA96293Housing · defectiveHOUSING OVERHAULED 8/2 96. TSO -0- UNABLE TO INSTALL CHECK VALVE INTO HOUSING BORE.SDR 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 .SDR 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.SDR 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.SDR 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.SDR HEEA967648Internal Sump · leakingRECEIVING INSPECTION REVEALED: LEAKING THROUGH INTERNAL SUMP GRAPHITE DURING PRESSURE CHECK. REPLACED DISCREPANT PART.SDR HEEA967649Case · defectiveUPON TURBINE ASSEMBLY NOTED THE FOLLOWING: UNABLE TO FIT AIR TUBE RETAINING RING INTO COMB CASE RING GROOVE. REPLACED DISCREPANT PART.SDR HEEA967650Gearbox Cover · mis mfgRECEIVING INSPECTION REVEALED: O RING GROOVE FINISH MACHINING NOT COMPLIED WITH ON GEARBOX COVER OIL SCAVENGE PORT AS MARKED.SDR CA970311044Circuit Breaker · chafed(CAN) PILOT REPORTED SMOKE FROM AUXILIARY POWER/WATER BUCKET CIRCUIT BREAKER. CHAFED WIRE FOUND BEHIND DART PANEL.SDR 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 GREASESDR HEEA967631Pto Gear · defectiveRECEIVING INSPECTION REVEALED COPPER COATING LIFTING ON P.T.O. GEAR FWD SIDE. REPLACED DISCREPANT PART.SDR 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.SDR 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.SDR 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 O
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