Allison 250-C28B
Service difficulty reports · 286
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 = '250C28B' 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 = '250C28B' 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 97ZZZX4472Fuel Control · malfunctionDURING A HOVER WHILE PREPARING TO TAKEOFF, THE ENGINE DECELERATED. A HOVERING AUTOROTATION WAS SUCCESSFULLY ACCOMPLISHED. UPON LANDING, THE ENGINE STABILIZED AT 40 PERCENT N WITH THE THROTTLE FULL OPEN AND THE COLLECTIVE FULL DOWN. FUEL CONTROL MALFUNCTION.SDR CA970807044Spring · missing(CAN) AIRCRAFT HAD LOW FUEL PRESSURE LIGHT ON. WHEN RIGHT HAND CHECK VALVE REMOVED IT WAS NOTICED THAT SPRING WAS MISSING. SPRING FOUND IN FUEL CELL.SDR HEEA0010513P.T. Support · misalignedRECEIVING INSPECTION REVEALED: MISALIGNMENT OF P.T. SUPPORT TANG SLOTS. UNABLE TO CENTER #4 NOZZLE ON ALIGNMENT. NOTE: TRIED SEVERAL #4 NOZZLES. INSTALLED A DALLAS AIRMOTIVE O/H #4 NOZZLE.SDR HEEA0010483Nozzle · crackedENGINE REMOVED DUE TO HIGH T.O.T. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #2 NOZZLE FWD INNER BAND, AFT INNER BAND WELDMENT SEPARATING AND CRACK VANES. INSTALLED A NEW #2 NOZZLE.SDR CA970715013Screw · broken(CAN) NUT NOTED AS MISSING FROM THE SERVO PILOT VALVE LOWER SCREW. SCREW WAS BROKEN AT THE FIRST THREAD FROM THE SHANK. NUT PROBABLY OVERTORQUED AT INSTALLATION.SDR CA970722010Pin · unserviceable(CAN) INCORRECT PIN INSTALLED, SUBMITTER STATED A 206B PIN RATHER THAN A 206L PIN WAS INSTALLED.SDR HEEA0010377Nozzle · over specRECEIVING INSPECTION REVEALED: MEASURED .022 OVER SPECS (8.480 - 8.470) ON #4 NOZZLE O.D. INSTALLED A DALLAS AIRMOTIVE OVERHAULED #4 NOZZLE.SDR HEEA0010192P.T. Support · defectiveRECEIVING INSPECTION REVEALED: COATING FLAKING ON P.T. SUPPORT BEARING BORE.SDR HEEA0010080Fuel Pump · wornFUEL PUMP WORN DRIVE SHAFT DRIVE SPLINES.SDR CA970528025Tube · chafed(CAN) TRANSMISSION OIL COOLER LINE CHAFED.SDR HAIHEEA9743Nozzle · defectiveRECEIVED PART FROM MACHINE SHOP. INSPECTION REVEALED; TIP PATH LIFTING ON #2 NOZZLE #2 TIP AS MARKED. INSTALLED A STANDARD AERO OVERHAULED #2 NOZZLE.SDR HAIHEEA9455Gearshaft · wornENGINE REMOVED DUE TO FLUCTUATING OIL PRESSURE. COMPRESSOR DISASSEMBLED DUE TO LOW POWER ON TEST CELL. UPON INPSECTION OF COMPRESSOR PARTS NOTED: STEP WEAR BEYOND SERVICEABLE LIMITS ON SPUR GEARSHAFT SPLINES.SDR HAIHEEA9430Fuel Control · defectiveFUEL CONTROL SHEARED SCREW IN BYPASS PLATE.SDR AU970300Structure · cracked(AUS) FUSELAGE STRUCTURE CRACKED WHERE VERTICAL CONTROL TUNNEL JOINS ROOF STRUCTURE IN AREA BELOW SERVO MOUNTING - FOUND DURING INSPECTION IAW AD/BELL206/82SDR HAIHEEA9225Nozzle · below specRECEIVING INSPECTION REVEALED: MEASURED .044 BELOW MIN. SPECS (6.200) ON #1 NOZZLE AFT ROPE PACKING INNER RIM ID.SDR CA970327017Tube · chafed(CAN) PC FILTER TO COMPRESSOR SCROLL TUBE FOUND CHAFED. CHAFING CAUSED BY ADJACENT HOSE.SDR HAIHEEA9216Nozzle · crackedENGINE REMOVED DUE TO METAL IN OIL. TURBINE DISASSEMBLED DUE TO HIGH GEARBOX PRESSURE ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES AND OUTER BAND. INSTALLED A NEW #1 NOZZLE.SDR HEEA979161Collector Strut · crackedENGINE REMOVED DUE TO FLUCTUATING OIL PRESSURE. TURBINE DISASSEMBLED DUE TO LOW POWER ON TEST CELL. DISASSEMBLY INSPECTION REVEALED: CRACKED BEYOND SERVICEABLE LIMITS ON EXHAUST COLLECTOR STRUT & EXCESSIVE RUNOUT ON CARBON SEAL BORE .006 (SPECS.0015) INSTALLSDR CA970310003Main Rotor Head · deterioration(CAN) DURING CALENDER REPLACEMENT OF MAIN ROTOR TT STRAPS THE INBOARD BEARING CAGES HAD DETERIORATED ALLOWING ROLLERS TO DISPLACE RESULTING IN BRINELLING OF BOTH INBOARD JOURNALS OF THE MAIN ROTOR YOKE. THE BRINELLING WAS LOCALIZED ON THE AFT SIDE OF THE JOURNSDR HEEA979153Nozzle · crackedENGINE REMOVED DUE TO HIGH OIL CONSUMPTION. UPON INSPECTION OF TURBINE PARTS NOTED: CRACKED AND BOWED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES. INSTALLED A NEW #1 NOZZLE.SDR HEEA979136Shroud Housing · over specsRECEIVING INSPECTION REVEALED: MEASURED .005 TO .007 OVER SPECS (10.199 - 10.200) ON SHROUD HOUSING AFT PILOT. INSTALLED A DALLAS AIRMOTIVE OVERHAULED SHROUD HOUSING.SDR 97ZZZX1378Mating Ring · leakingMATING RING LEAKING AFTER ONLY 23.5 HOURS.SDR HEEA968762Gearshaft · step wearENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: STEP WEAR BEYOND SERVICEABLE LIMITS ON SHAFT AFT SPLINES. INSTALLED A USED SERVICEABLE PART.SDR HEEA968709Fuel Control · leakingFUEL CONTROL REMOVED DUE TO LEAKING AROUND RETAINING PLATE AREA. NO PROBLEM WITH RFSE 250-93-3 MEDLIN BEARINGS. REPLACED WITH AN OVERHAULED FUEL CONTROL.SDR CA970626009Governor · surging(CAN) ENGINE LOST POWER SUDDENLY, THEN SURGED TOWARDS OVERTORQUE AND OVERSPEED. POWER OSCILLATIONS IN-FLIGHT.SDR HEEA968526Pump · leakagePUMP EXCESSIVE DRAIN LEAKAGE.SDR HEEA968472Front Support · defectiveRECEIVING INSPECTION REVEALED: DEPTH BELOW SPECS ON FRONT SUPPORT FORWARD #1 BEARING HOUSING BORE. ALSO REMOVED SPUR ADAPTER GEARSHAFT DUE TO METAL DEPOSIT ON ONE SPUR ADAPTER GEARSHAFT GEARTOOTH. INSTALLED A NEW FRONT SUPPORT AND NEW SPUR ADAPTER GEARSHAFT.SDR HEEA968473Gearshaft · defectiveRECEIVING INSPECTION REVEALED: METAL DEPOSIT ON ONE SPUR ADAPTER GEARSHAFT GEARTOOTH. ALSO REMOVED FRONT SUPPORT DUE TO DEPTH BELOW SPECS ON FRONT SUPPORT FORWARD #1 BEARING HOUSING BORE. INSTALLED A NEW FRONT SUPPORT AND NEW SPUR ADAPTER GEARSHAFT. SUBMISDR HEEA968479Gearshaft · wornENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: FAILED GO,NO-GO GUAGE INSPECTION ON SPUR ADAPTER GEARSHAFT AFT SPLINES. INSTALLED NEW PART.SDR 97ZZZX480Tube · leakAIRCRAFT EXPERIENCED TRANSIENT OVER TEMP. HOT SECTION INSPECTION C/W, NO DAMAGE NOTED FROM OCCURRENCE. SUSPECT CAUSE IS AIR LEAK AT BLEED VALVE PR LINE. LEAK CHECK MUST BE DONE WITH BLEED CONTROL SOLENOID IN OPEN POSITION.SDR HEEA968227Nozzle · excess runoutDISASSEMBLED TURBINE DUE TO N1 TIP DRAG ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED: EXCESSIVE RUNOUT .007 BEYOND SERVICEABLE LIMITS ON #2 NOZZLE #1 AND #2 TIP PATHS. INSTALLED A DALLAS AIRMOTIVE OVERHAULED #2 NOZZLE.SDR CA961105501Leg Assembly · cracked(CAN) WHILE REMOVING TURBINE FROM AIRFRAME, THE STRUT CRACKED IN TWO. THE CRACK OCCURRED UNDER THE HOSE CLAMP. THE CLAMP HAD PROBABLY NEVER BEEN REMOVED AND THE AREA UNDERNEATH CLEANED. THIS LED TO A BUILD UP OF DIRT WHICH EVENTUALLY CORRODED THE STRUT TO THE SDR HEEA967820Diffuser Vane · weld brokenUPON INSTALLATION OF VANE NOTED: TWO STUD WELDS BROKEN AS MARKED DURING TORQUE. REPLACED DISCREPANT PART.SDR HEEA967768Pump · wornWORN INTERNAL DRIVE SPLINES.SDR 97ZZZX1374Nozzle · meltedNR 1 NOZZLE BRAZE JOINTS MELTED. ONLY RAN .6 HOURS ON TEST CELL RUN.SDR CA970311045Fuel Contrl Unit · failed(CAN) AIRCRAFT IN HOVER, ENGINE DECELERATED. AIRCRAFT AUTO-ROTATED TO GROUND. ENGINE CONTINUED TO OPERATE BUT WOULD ONLY PRODUCE 90 PERCENT NR. FUEL CONTROL UNIT REPLACED.SDR HEEA967680Gear · groovedENGINE REMOVED DUE TO HARD LANDING AND SUDDEN STOPPAGE. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: GROOVED BEYOND OVERHAUL LIMITS ON PTO GEAR FWD AND AFT SEAL JOURNALS. REPLACED DISCREPANT PART.SDR HEEA967644Rear Support · mis mfgRECEIVING INSPECTION REVEALED: IMPROPERLY MACHINED REAR SUPPORT RETAINING RING GROOVE. REPLACED DISCREPANT PART.SDR HEEA967646Shaft · defectiveRECEIVING INSPECTION REVEALED: PLATING MISSING ON THE OUTER PT SHAFT SEALING SURFACE. REPLACED DISCREPANT PART.SDR 96ZZZX3944Bearing · failedAIRCRAFT EXPERIENCED 3 CHIP LIGHTS WITHIN 50 HOURS. AIRCRAFT GROUNDED PER ALLISON MM. UPON INVESTIGATION FOUND NR 1 BEARING CAGE BROKEN INTO PIECES AND BEARING FELL APART. SIMPLE MECHANICAL FAILURE THAT COULD HAVE CAUSED ENGINE FLAME-OUT.SDR HEEA967500Gearshaft · step wearENGINE REMOVED DUE TO SMOKE ON SHUTDOWN. UPON VISUAL INSPECTION OF COMPRESSOR NOTED THE FOLLOWING: STEP WEAR BEYOND SERVICEABLE LIMITS ON SPUR ADPATER GEARSHAFT AFT SPLINES. REPLACED DISCREPANT PART.SDR HEEA967502Spline Adapter · wornENGINE REMOVED DUE TO TURBINE OVERHAUL AND COMPRESSOR N1 SHAFTING INSPECTION. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: STEP WEAR BEYOND SERVICEABLE LIMITS ON SPUR ADAPTER GEARSHAFT AFT SPLINES AND STEP WEAR BEYOND SERVICEABLE LIMITSON SPLINE SDR HEEA967491Rear Support · defectiveENGINE DISASSEMBLED DUE TO LOW POWER AND HIGH COMPRESSOR VIBS ON TEST CELL. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: COATING LIFTING ON REAR SUPPORT MAJOR AND MINOR SEALS. REPLACED DISCREPANT PART.SDR HEEA967420Nozzle · crackedENGINE REMOVED DUE TO CRACKED FIRST STAGE NOZZLE AND LOW POWER ON TEST CELL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: EXCESSIVE RUN OUT (.007) BEYOND SERVICEABLE LIMITS ON #2 NOZZLE TIP PATHS. REPLACED DISCREPANT PART.SDR HEEA967422Nozzle · crackedENGINE REMOVED DUE TO HIGH OIL CONSUMPTION. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED AND BOWED BEYOND SERVICEABLE LIMITS ON #1 NOZZLE VANES. REPLACED DISCREPANT PART.SDR CA960619024Release Cable · binding(CAN) UNCOMMANDED SLING LOAD RELEASE. INVESTIGATION FOUND THAT MANUAL RELEASE CABLE WOULD NOT RETURN TO FULLY EXTENDED POSITION. SUSPECT CABLE FRAYED AND BINDING INSIDE SHEATH.SDR HEEA967387Nozzle · defectiveUPON INSPECTION OF PART NOTED THE FOLLOWING: 2-4 SEAL RUN OUT .011 WITH GOOD RUNOUT IN THE TIP PATH. TIP PATH RUNOUT .010 WITH A GOOD 2-4 SEAL RUNOUT. REPLACED DISCREPANT PART.SDR HEEA967382Wheel · damagedENGINE REMOVED DUE TO HARD LANDING AND SUDDEN STOPPAGE. REMOVED 3RD STAGE WHEEL PER LETTER C1281F-RMG-1295/CEB A 72-2176. REPLACED DISCREPANT PART.SDR HEEA967383Tube Assy · bentUPON INSPECTION OF PART NOTED THE FOLLOWING: BENT BEYOND SERVICEABLE LIMITS ON TUBE OIL PRESSURE NOZZLE. REPLACED DISCREPANT PART.SDR HEEA967286Combustion Liner · crackedENGINE REMOVED DUE TO LOW POWER. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED BEYOND SERVICEABLE LIMITS ON COMBUSTION LINER I.D. IN DOUBLE LIP AREA. REPLACED DISCREPANT PART.
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