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 95ZZZX6973Bearing · making metalC/W SUPERIOR AIR PARTS SB T95-SB001. FOUND 13 METAL FLAKES IN FACET FILTER BOWL. TURBINE ASSY CAT37299. REPLACED WITH ALLISON MANUFACTURED BEARING.SDR 95ZZZX3921Governor · misriggedDURING RIGGING CHECK, THE GOVERNOR CONTACTED THE UPPER LIMIT STOP BEFORE THE COLLECTIVE REACHED ITS STOP.SDR 95ZZZX3922Vent Tube · detachedENGINE DIFFUSER VENT ORIFICE TUBE WOULD NOT STAY IN PLACE. INSPECTION FOUND END OF THE TUBE THAT SLIPS INTO THE VENT BOSS WAS DEFORMED. INSTALLED NEW TUBE.SDR HEEA955406Wheel · sulfidationENGINE REMOVED DUE TO 1ST STAGE WHEEL RETIREMENT DUE. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR 96ZZZX270Diffuser · crackedCOMPRESSOR WAS FOUND CRACKED CAUSING HIGH TOT. COMPRESSOR IS OUT OF BALANCE AND ALSO NR 1 BEARING OIL SEAL WAS LEAKING.SDR 95ZZZX3747Nozzle · defectiveAIRCRAFT WOULD DROOP RPM WHEN THE COLLECTIVE WAS LIFTED. REPLACEMENT OF THE FUEL NOZZLE CORRECTED THE PROBLEM. FCU WAS CHANGED AS PRECAUTION.SDR 95ZZZX3740Fuel Control · malfunctionedPART WAS RETURNED FROM REPAIR AND INSTALLED ON THE AIRCRAFT ONLY TO HAVE THE SAME SYMPTOMS 1.5 HOURS LATER. COMPONENT HAS A FUEL SCHEDULING PROBLEM AND HAS BEEN SENT IN AGAIN ON ALLISON 250 REPORT NR A160211.SDR 95ZZZX3743Wheel · crackedENGINE WOULD NOT MAKE POWER. FOUND 3RD STAGE WHEEL CRACKED.SDR HEEA955336Servomotor · trips breakerPOPS CIRCUIT BREAKER. INSPECTED BY ACCESSORY OVERHAUL SHOP AND FOUND MOTOR HAS INTERMITTENT OPERATION.SDR CA950829002Compressor Vane · failed(CAN)SEVERE EROSION APPEARS TO HAVE CAUSED ONE OR MORE VANES ON THE THIRD STAGE TO SEPARATE FROM ROOT ATTACHMENT BRAZE JOINTS. SEPARATED VANES CAUSED MASSIVE SUBSEQUENT DAMAGE TO LATER STAGES OF VANES AND BLADES.SDR 95ZZZX3750Engine · flame outENGINE FLAMED OUT IN HOVER. EXPERIENCED SUCCESSFUL RESTART ON FIRST ATTEMPT. TWO MINUTES RUN AT 100 PERCENT N2 WITH BOOST PUMPS OFF - CHECKED OKAY. SHUT DOWN ENGINE. BLED SYSTEM, FOUND AIR IN ENGINE MOUNTED FUEL FILTER HOUSING. RAN ENGINE, SHUT DOWN, BLEDSDR 95ZZZX3753Burner Liner · misinstalledWHEN BURNER CAN LINER WAS ASSEMBLED, THE LOWER SKIRT WAS TURNED 90 DEGREES WHICH MISPLACED TWO LARGE COOLING HOLES. THIS CAUSED THE ENGINE TO START SLOW (60 SECONDS), HANG AT 42 PERCENT, AND HAVE A DELAYED LIGHT OFF. THE PROBLEM ONLY SHOWED UP AFTER ABOUT 50SDR ERAA9589Nozzle · delaminatedSENT TO D/AIRMOTIVE ON ERA P.O. G108376 FOR OVERHAUL ON D/A WORK ORDER C67743 4/24/95. NOZZLE HAS -0- T.S.O. AND PORTION OF METALIZED AREA OF #4 BLADE TIP PATH DELAMINATED DURING MACHINING.SDR 95ZZZY1458Govenor · defectiveNG SPLIT. FOUND GOV FAULTYSDR 95ZZZX4087Bearing · galledDISASSEMBLED GEARBOX DUE TO 'ENGINE CHIP LIGHT'. DISCOVERED THE P.T.O. ROLLER BEARING TO BE 'GALLING ROLLERS'. CAUSE UNKNOWN.SDR ERAA9585Sump Cover · leakPIT ON SMALL O-RING SEAL AREA; OIL LEAK.SDR ERAA9586Bellows Seal · groovedSEAL HAS 93.6 HOURS T.T.. SEAL HAS GROOVES ON CONTACT FACE OF CARBON SEAL.SDR TEIL956Bearing · making metalINNER RACE FAILED CAUSING METAL ON CHIP DETECTORS. GEARBOX OVERHAULED AND UPDATED TO LATEST MOD STANDARD. BEARINGS REPLACED.SDR 95ZZZX3334Fuel Control · malfunctionAIRCRAFT HUNG-START AT 30 PERCENT - ALL SUBSEQUENT ADJUSTMENT HAD LITTLE OR NEGATIVE EFFECT ON THE FUEL SCHEDULING. REMOVED AND REPLACED UNIT AND AIRCRAFT STARTS NOW. UNIT SENT IN FOR OVERHAUL.SDR ERAA9581Vane Assy · stud brokeDIFFUSSER VANE WAS SENT IN FOR REPAIR BY DALLAS AIRMOTIVE ON ERA POG105627, D/AIRMOTIVE W/O C67418 7/19/94. STUD BROKE AT 30 IN LBS. SEVERAL OTHER STUDS APPEAR TO HAVE WEAK MOLDS.SDR ERAA9582Nozzle · defectiveNOZZLE WAS SENT TO DALLAS AIRMOTIVE FOR OVERHAUL ON ERA P.O. G108745 , D/AIRMOTIVE W/O C67772 . PART HAS -0- HRS TSO AND .007 -.009 SEAL RUNOUT ALL TANG LOCATIONS, WITH NOZZLE IN FIXTURE OR PT SUPPORT.SDR ERAA9578Coupling · defectiveSHAFT UNDERCUT DIMENSIONS; SHAFT INDENTIONS BETWEEN SEAL GROOVES AND BELOW SPLINE END (NOT SCALLOPED END) OD OF SHAFT AT THESE POINTS DIFFER. 1.093" AND 1.104".SDR ERAA9579Coupling · defectiveSHAFT INDENTIONS BETWEEN SEAL GROOVES AND BELOW SPLINE END (NOT SCALLOPED END) - OD OF SHAFT AT THESE POINTS DIFFER. 1.093" AND 1.104".SDR ERAA9580Nozzle · crackedLOW POWER, VANES CRACKED BEYOND LIMITS, VANES COLLAPSING IN MIDDLE OF VANE. (NOTE: SUPERIOR TURBINE SERVICE LETTER T94-022.)SDR HEEA955119Wheel · sulfidationENGINE REMOVED DUE TO CYCLED OUT 1ST AND 2ND STAGE WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR HEEA955120Wheel · blades failedENGINE REMOVED DUE TO ENGINE FAILURE ON RUN-UP. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: 100% OF 1ST STAGE WHEEL BLADE TIPS FAILED .450" OUTBOARD FROM HUB TO BLADE TIP LEADING EDGE DUE TO THERMAL FATIGUE CAUSED BY ENGINE OPERATING IN AN OVERTEMPSDR HEEA955121Wheel · blades failedENGINE REMOVED DUE TO ENGINE FAILURE ON RUN-UP. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: 100% OF 1ST STAGE WHEEL BLADE TIPS FAILED .450" OUTBOARD FROM HUB TO BLADE TIP LEADING EDGE DUE TO THERMAL FATIGUE CAUSED BY ENGINE OPERATING IN AN OVERTEMPSDR 95ZZZX6497Oil Tube · defectiveOIL TUBE FAILED INSPECTION REQUIRED BY CEB1307. REMOVED AND REPLACED.SDR HEEA955071Wheel · sulfidationENGINE REMOVED DUE TO TURBINE 1750 HOUR INSPECTION AND BURNT 1ST STAGE NOZZLE. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR 95ZZZX3123Governor · failedAIRCRAFT FLEW IN NORMAL CRUISE FOR APPROXIMATELY 1.7 HOURS. PILOT LOWERED COLLECTIVE FOR ROUTINE LANDING. GOVERNOR RESPONDED ERRATIC WITH OSCILLATING N2, THEN STABILIZED AT 103 PERCENT N2. INVESTIGATION SHOWED WHEEL GEAR CAME LOOSE FROM DRIVE SHAFT. AIRCRASDR HEEA955024Igniter Plug · failedTIP WORN AND CORRODED, NO IGNITION.SDR ERAA9577Inner Shaft · pittedNEW INNER SHAFT THAT HAS PITS ON BEARING RACE.SDR 95ZZZX5495Seal · leakingOIL BELLOW SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM.SDR 95ZZZX6971Seal · leakingOIL BELLOWS SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM.SDR 95ZZZX6972Seal · leakingOIL BELLOWS SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM.SDR ERAA9573Nozzle · not bondedNOZZLE WAS OVERHAULED BY DALLAS AIRMOTIVE ON W/O C67745, SENT IN ON ERA P.O. G108376 , RECEIVED BACK AT ERA 3/16/95. A VISUAL INSPECTION WAS CONDUCTED AND DISCOVERED THAT THE METALIZED PORTION OF THE 2ND STG BLADE TIP PATH IS NOT BONDED TO THE PARENT MATERIASDR ERAA9574Nozzle · tip delaminatedNOZZLE SENT IN EXCHANGE FOR S/N X58872 THAT HAD BEEN OVERHAULED ON D/AIR W/O C67745 AND RETURNED FOR TIP PATH NOT BEING BONDED TO PARENT MATERIAL. THIS NOZZLE REC'D IN EXCHANGE IS ALSO BAD, 2ND STAGE BLADE TIP PATH IS DELAMINATING.SDR ERAA9576Adapter · plating flakingNEW ADAPTER THAT HAS DAMAGED INTERNAL SPLINES, FLAKING SILVER PLATING.SDR ERAA9572Gp Support · mis overhauledG.P. SUPPORT WAS OVERHAULED BY DALLAS AIRMOTIVE ON W/O C67562 , SENT IN ON ERA P.O.G107056 AND RECEIVED BACK JAN 18, 1995. TANG SLOTS ARE UNDER SIZED.SDR CA960514105Rotors · eroded(CAN) HEAVY EROSION OF 4TH AND 5TH STAGE ROTORS AND UNDERCUTTING ON 4TH AND 5TH STAGE STATOR VANES. CORROSION OF COMPRESSOR SCROLL.SDR TEIL953Lever Assy · defectiveGOVENOR ATTACH BEARING WILL NOT GO ON SLEEVE. MIC DIMENSION OF BEARING SHAFT 6.016 MM. NEW PART SECURED AND INSTALLED. NEW PART SHAFT DIMENSION 5.9 MM.SDR 95ZZZX3102Pump · leakingENGINE DRIVEN FUEL PUMP FOUND LEAKING FUEL FROM BEARING SEAL. REPLACED PUMP.SDR ERAA9568Outer Shroud · defectiveNEW PART WITH -0- HOURS. SHROUD WILL NOT THREAD INTO BODY.SDR ERAA9570Bearing · defectiveNEW BEARING WITH -0- HRS. ROLLER END RADIUS NOT CONSISTENT.SDR ERAA9565Wheel · damaged splineNEW WHEELS WITH -0- HRS THAT HAVE 2ND STAGE WHEELS HAVE DAMAGED SPLINES.SDR ERAA9566Adapter · rough splinesNEW ADAPTERS WITH -0- HOURS HAVE ADAPTER HAS ROUGH SPLINES.SERIAL NUMBERS ARE PX253, PX231, PX252SDR ERAA9567Coupling · rough splinesSPLINES ARE ROUGH ON N1 COUPLING.SDR ERAA9564Nozzle · failedWHILE CUTTING 2ND STG B.T.P. CLEARANCE METAL BEGAN TO FLAKE OFF. 2ND STAGE NOZZLE SENT IN FOR OVERHAULSDR 95ZZZX2369Governor · defectivePILOT COULD NOT MAKE SMOOTH 'BEEP' ADJUSTMENTS. REMOVED AND REPLACED UNIT. FELT A NOTCH IN THE ROTATION OF THE LEVER ARM. UNIT SENT TO BE REPAIRED ON ALLISON 250 REPORT A160119.SDR 95ZZZX2552Shield · defectiveNOZZLE SHIELD HAS SADDLE PROTRUSIONS, UNDERSIZE.
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