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 97ZZZX1323Pinion Gear · wornINTERNAL SPLINES WORN OR AT LEAST BEYOND MAXIMUM LIMITS. NO WEAR STEP. BOTH BEARINGS JOURNALS .0002 INCH BELOW MINIMUM DIAMETER.SDR HAIHEEA9220Gearbox Cover · defectiveGEARBOX DISASSEMBLED DUE TO AFT T/M LEAK ON TEST CELL. DISASSEMBLY INSPECTION REVEALED: AFT BUSHING HEIGHTH EXCEEDS PRINT DIMENSION ON GEARBOX COVER. INSTALLED A DALLAS AIRMOTIVE REPAIRED GEARBOX COVER. TIME SINCE REPAIR 0:00.SDR 97ZZZX1682Damper Ring · crackedFOUND DAMPER RING CRACKED AND A SMALL CHIP MISSING ON THE OUTSIDE DIAMETER OF THE RING. THIS DEFECT BEING ON THE GEAR SIDE OF THE RING, FITS ALL THE WAY IN THE GROOVE, AND WAS ONLY FOUND AFTER REMOVAL. CRACK WAS 2 INCHES FROM THE END OF THE RING.SDR 97ZZZX1786Gear · teeth pittedFOUND PTTING AND NICKS ON TEETH OF AIR OIL SEPARATOR GEAR.SDR HAIHEEA9214Nozzle · defectiveENGINE REMOVED DUE TO TURBINE OVERHAUL. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. DISASSEMBLY INSPECTION REVEALED: MATERIAL FLAKING AND MISSING ON #2 NOZZLE #2 TIP PATH. INSTALLED A DALLAS AIRMOTIVE OVERHAULED #2 NOZZLE.SDR HAIHEEA9215Nozzle · crackedTURBINE REMOVED DUE TO OVERHAUL. UPON INSPECTION OF TURBINE PARTS NOTED; CRACKED BEYOND LIMITS ON #1 NOZZLE VANES. INSTALLED A NEW #1 NOZZLE.SDR HAIHEEA9218Nozzle · crackedENGINE REMOVED DUE TO TURBINE OVERHAUL. UPON TURBINE DISASSEMBLY NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES AND OUTER BAND. INSTALLED NEW #1 NOZZLE.SDR HAIHEEA9219Nozzle · crackedENGINE REMOVED TO COMPLY WITH TURBINE 1750 HOUR INSPECTION. UPON INSPECTION OF TURBINE PARTS NOTED: BURNT AND CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES AND CRACKED OUTER BAND. INSTALLED NEW #1 NOZZLE.SDR 97ZZZX1409Pto Gear Spline · wornDURING INSPECTION OF GEARBOX GEARS, FOUND THE PTO GEAR INTERNAL DRIVE SPLINES WORN BEYOND LIMITS.SDR 97ZZZX1410Spur Gear · spalledDURING INSPECTION OF GEARBOX GEARS, THE TEETH WERE FOUND SPALLED.SDR 97ZZZX1411Spur Gear · spalledINSPECTION FOUND GEAR TEETH SPALLED.SDR 97ZZZX1412Gearshaft · wornINSPECTION FOUND TACHOMETER DRIVE WORN BEYOND LIMITS.SDR 97ZZZX1413Gear · wornDURING INSPECTION OF GEARBOX GEARS, FOUND THE TORQUE METER GEAR DAMPER RING GROOVE WORN BEYOND LIMITS.SDR 97ZZZX1256Gearshaft · wornTACHOMETER DRIVE END WORN ABOUT .040 INCH.SDR NYBA973Wheel · crackedFIRST STAGE WHEEL IS CRACKED.SDR NYBA975Engine Assy · defectiveENGINE IS DEFECTIVE. REPLACED N1 SECTIONSDR 97ZZZX1118Turbine · smoking19.4 HOURS AFTER A REPAIR TO THE TURBINE PT SUPPORT, THE TURBINE STARTED SMOKING HEAVILY ON SHUT DOWN. AFTER THE ENGINE COOLED, A VISUAL INSPECTION FOUND OIL PUDDLING IN THE TURBINE EXHAUST COLLECTOR. UNIT SENT BACK FOR REPAIR.SDR 97ZZZX1134Gearshaft · wornTACH DRIVE END WORN ABOUT .040 INCH. SUBMITTER STATED FOUND ABOUT 50 PERCENT OF ALL THE GEARS ARE FOUND WORN WHEN INSPECTED.SDR NYBA972Turbine Assy · burnedTURBINE ASSY IS BURNED. REPLACEDSDR AU970491Nozzle · worn(AUS) NO6 AND NO7 BEARING OIL NOZZLE WORN AND CORRODEDSDR 97ZZZX1092Case · liner looseCOMPRESSOR CASE PLASTIC LINER CAME LOOSE IN THE BLEED VALVE AIR FLOW BAND OF COMPRESSOR CASE. ONE PIECE APPROXIMATELY 2 SQUARE INCHES IN SIZE LODGED IN BLEED VALVE.SDR 97ZZZX1140Oil Tube · too shortINSPECTED OIL TUBE PER CEB1307 AND IS TOO SHORT PER REQUIREMENTS OF THE BULLETIN. PART WAS REPLACED.SDR AU970492Clamp · broken(AUS) ENGINE EXHAUST PIPE CLAMP BROKEN AT RIVET LINESDR HEEA979151Housing · below specsGEAR BOX HOUSING RECEIVING INSPECTION REVEALED: MEASURED .0025 BELOW SPECS (3.8490 MIN) ON GEARBOX HOUSING COMPRESSOR MOUNT STUD AS MARKED.SDR HEEA979152Nozzle · crackedENGINE REMOVED DUE TO AFT T/M BORE OIL LEAK. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED AND BOWED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES. INSTALLED A NEW #1 NOZZLE.SDR CA970311077Bushing · worn(CAN) FUEL CONTROL UNIT POINTER BUSHING WAS FOUND TO BE EXCESSIVLEY WORN.SDR 97ZZZX1139Nozzle · gougedDURING DISASSEMBLY OF ENGINE GEARBOX, NR 4 BEARING WAS FOUND NOT TO BE SEATED ALL THE WAY ON THE JOURNAL ON THE HELICAL GEAR DUE TO IMPROPER INSTALLATION. SUBSEQUENT INSPECTION FOUND THE 6875776 OIL NOZZLE GOUGED ON THE BOTTOM FLANGE BY THE BEARING. REPLACEDSDR 97ZZZX1186Bearing · pittedDURING INSPECTION OF ENGINE GEARBOX, BEARING WAS FOUND TO BE PITTED ON SEVE RAL ROLLERS.SDR 97ZZZX1187Picollo Tube · burrsINSPECTED PICOLLO TUBE PER CEB 1177 (S/N BN16959) AND FOUND BURRS - SCRAPPED PER CEB.SDR HEEA979127Tube Assy. · defectiveENGINE REMOVED DUE TO LOW OIL PRESSURE. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: TUBE ASSEMBLY DIMENSIONAL CHECK PER CEB1307. INSTALLED ANOTHER TUBE.SDR HEEA979138Wheel · defectiveTURBINE REMOVED DUE TO METAL IN OIL AND HIGH CYCLED #1 AND #2 WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON 75% OF TRAILING EDGE OF WHEEL. SCRAPPED #1 WHEEL.SDR AU970120Blade · cracked(AUS) TAIL ROTOR BLADE SKIN CRACKED IN AREA INBOARD OF THE LEADING EDGE PROTECTION STRIP RUNNING CHORDWISE FROM THE LEADING EDGE TOWARDS THE TRAILING EDGE - CRACK LENGTH APPROXIMATELY 25.4MM (1IN)SDR AU970163Blade · cracked(AUS) TAIL ROTOR BLADE SKIN CRACKED IN AREA JUST INBOARD OF THE LEADING EDGE PROTECTIVE STRIP RUNNING CHORDWISE TOWARDS THE TRAILING EDGE - CRACK LENGTH APPROXIMATELY 25.4MM (1IN)SDR 97ZZZX1384Bellows Seal · leakingCARBON BELLOWS SEAL LEAKING AFTER ONLY 23.5 HOURS.SDR CA970304001Cylinder Support · cracked(CAN) DURING 100 HOUR INSPECTION OF THE UPPER DECK FLIGHT CONTROLS, A CRACK WAS FOUND IN THE FORWARD R/H WEB ON THE TOP EDGE.SDR HEEA979119Blades · damagedRECEIVING INSPECTION REVEALED: MINOR F.O.D. AND CORROSION PITS ON #1 COMPRESSOR WHEEL BLADES. PHI REQUESTING 100% WARRANTY REPAIR. PART OVERHAULED ON DALLAS AIRMOTIVE W/O# LF1015.SDR 97ZZZX957Turbine · nozzle damageGROUND PERSONNEL NOTICED NOISE COMING FROM ENGINE DURING START-UP AND SHUT DOWN BETWEEN 20 PERCENT AND 60 PERCENT N1 RPM. THE ENGINE RAN NORMAL AT GROUND IDLE. UPON DISASSEMBLY OF THE ENGINE, THE CAUSE OF THE NOISE WAS FOUND TO BE EXCESSIVE HEAT DAMAGE TO THSDR 97ZZZX921Actuator · defectiveDURING RUN-UP IT WAS DISCOVERED THE GOV NEEDED CONSTANT ADJUSTMENT UP AND DOWN WITH THE TRIM MOTOR. IT WAS FOUND THAT THE TRIM MOTOR HAS SOME INTERNAL SLOP. REPLACED TRIM MOTOR.SDR 97ZZZX922Line · chafedDURING RE-ASSEMBLY OF THE ENGINE, IT WAS FOUND THAT THE FUEL LINE FROM FCU TO THE CHECK VALVE WAS CONTACTING ANOTHER LINE. NORMALLY, THIS INDICATES IT IS INSTALLED BACKWARDS, BUT IN THIS CASE, IT HIT BOTH WAYS. NO PART NUMBER WAS FOUND ON THE TUBE, AND A NEWSDR CA970227006Hydraulic Pump · sheared(CAN) HYDRAULIC PUMP DRIVE SHAFT SHEARED AT A POINT JUST BEFORE THE SPLINE AREA.SDR CA970421055Clutch · loose ring(CAN) WHILE PURGING THE BEARING ON THE OVER RUNNING CLUTCH, THE RING SECURING THE REAR BEARING CAP POPPED OFF. THE RING WAS REPLACED, BUT CAME OFF AGAIN AS GREASE WAS PURGED. PART TC: 228.SDR CA980126001Governor · failed(CAN) UNABLE TO HOLD STEADY N2 RPM, SURGING OVER/UNDER SPEED.SDR CA970311085Hose Assy · corroded(CAN) HOSE ASSEMBLY HAS CORROSION AT THE END FITTING.SDR CA970311087Support · corroded(CAN) EXTENSIVE CORROSION OF SUPPORT.SDR CA970311088Support · cracked(CAN) CRACKS ON BOTH SIDES OF CASTING.SDR CA970311086Combustion Liner · damaged(CAN) MECHANICAL DAMAGE FROM SCAVANGE HOSE USED IN CASEY HEATER. THE WIRE BRAIDING HAD WORN A DEEP GROOVE IN OUTER CAN WHICH REQUIRES A PATCH REPAIR.SDR CA970210002Blade · delamination(CAN) BUBBLE DELAMINATION ON LOWER SURFACE OF ABRASION STRIP - APPROXIMATELY 1/2" X 2" LONG EXTENDING WITHIN 3/8" OF THE TRAILING EDGE.SDR CA970225003Pitch Link Assy · cracked(CAN) 2 CRACKS FOUND ON LOWER END OF PITCH LINK TUBE. 1 APPROXIMATELY 3/8" AND 1 APPROXIMATELY 1/2".SDR 97ZZZX579Pt Shaft · chippedENGINE REJECTED DUE TO N2 SPLINE CHIPPED SHAFT. THE FRONT END OF THE SPLINE WAS CHIPPED. SUBMITTER BELIEVES THIS IS CAUSED AT INSTALLATION OF TURBINE GEARBOX.SDR HEEA978922Tube Assy. · defectiveENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: TUBE ASSEMBLY FAILED DIMENSIONAL CHECK PER CEB1307. INSTALLED A NEW TUBE.
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