Allison 250-C47B
Service difficulty reports · 1,403
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 = '250C47B' 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 = '250C47B' 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 HEEA073753Nozzle · corrodedTHREADS RUSTED AND DAMAGED. REPLACED WITH SERVICEABLE PART.SDR R7MA33719Switch · stuckSTUCK IN MANUAL MODE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR R7MR33496Blower · inoperativeUNIT INOPERATIVE. RUNS FOR A SHORT AMOUNT OF TIME THEN SHUTS DOWN. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR AUS20010894Engine · overheated(AUS) TURBINE OVER TEMPERATURE DURING ENGINE SHUTDOWN.SDR R7MR33420Hmu · failedFADEC FAULT. LIGHT CAME ON DURING FLIGHT AND COULD NOT BE EXPLAINED, SO IT WAS OPTED TO REPLACE THE HMU. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR R7MA33720Valve · stuckSTUCK IN OPEN POSITION. REPLACED WITH NEW UNIT CORRECTED PROBLEM.SDR HEEA073007Line · chafedLINE IS CHAFED. REPLACED LINE.SDR ALG2001F00001Drive Shaft · failedIN CRUISE FLIGHT. VIBRATION IN AIRFRAME AND PEDALS INCREASING IN AMPLITUDE FROM SLIGHT TO EXTREME. WHEN THE VIBRATION REACHED THE EXTREME LEVEL, POWER WAS LOST TO THE ROTOR SYSTEM AND THE AIRCRAFT WAS AUTOROTATED TO THE WATER. INPUT DRIVESHAFT FAILED AND WASDR R7MR33330Latch · wornLATCH, WORN BEYOND SERVICEABLE LIMITS. REMOVED AND REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR 20010420CW014Bearing · damagedON THE 2ND SHUT DOWN OF THE DAY, LOUD NOISES AND EXCESSIVE VIBRATION WERE NOTED. FORWARD BEARING ON THE NR 2 TAILROTOR DRIVESHAFT, (OIL COOLER BLOWER) HAD AN UNCONTAINED FAILURE. BLOWER DECK AND SUPPORTING STRUCTURE CRACKED AFT ENGINE FIREWALL AND IMPELLER HSDR R7MR32756Hmu · inoperativeAIRCRAFT FAILED TO START. SUSPECT START VALVE NOT HOLDING PRIME. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR R7MR33332Adapter · wornWORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. NOTE: TRYING TO LOCATE DISCREPANT PART.SDR 20010314CW002Housing · crackedFOUND DURING ROUTINE MAINTENANCE. BLOWER HOUSING HAD CRACKED.SDR BH1R708876Yoke · out of toleranceDURING FIRST OVERHAUL OF TAIL ROTOR HUB, YOKE ASSEMBLY WAS FOUND TO HAVE BOTHE INBOARD BEARING RACES WORN OUT OF LIMITS. REMOVED AND REPLACED YOKE.SDR 20010228CW005Yoke · out of positionINBOARD BEARINGS 2EA WERE FOUND TO HAVE SHIFTED IN YOKE APPROXIMATELY .050 IN OFF CENTER. ONE YOKE BORE WAS WORN BEYOND LIMITS.SDR R7MR32718Fuel Filter · inoperativePRESSURE TEST INOPERTIVE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR 20010123CW009Hub · debondedRUBBER DEBONDED IN FLIGHT, M/R HUB DAMPER ELASTOMERIC.SDR CA010117006Mount · cracked(CAN) ENGINE CAME IN FOR REPAIR FOR SMOKING ON SHUTDOWN. AFTER TESTING THE ENGINE, IT WAS NOTICED THAT THERE WAS OIL PRESENT IN THE NR1 NOZZLE AREA. UPON DISSASSEMBLY, A SMALL CRACK WAS FOUND ON THE NR1 NOZZLE MOUNT FACE. AFTER CLEANING, IT WAS NOTED THAT THE SDR R7MR32717Battery · inoperativeWILL NOT HOLD CHARGE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR 20001206SH005Nozzle · brokenTURBINE RECEIVED IN SHOP TO PERFORM 2000 HOUR OVERHAUL. UPON REMOVAL OF OUTER COMBUSTION CASE AND COMBUSTION LINER, FOUND A HOLE IN DOME OF 1ST STAGE SHIELD. ALSO, FOUND THE BROKEN PIECE LODGED ON 1ST STAGE NOZZLE VANE. POSSIBLE IMPROPER METAL USED TO MAKE SDR 20001206SH008Drive Shaft · failedIN-FLIGHT, PILOT HEARD A LOUD POP. LANDED AT THE NEAREST PLATFORM AND AFTER SHUT DOWN, FOUND FORWARD FLEXURE ON INPUT DRIVESHAFT HAD FAILED. ONE OF THE FORWARD FLEXURES FAILED AT THE BOLT HOLE AND A PORTION OF THE FLEXURE WENT THROUGH THE TRANSMISSION DECK/CSDR 20001206SH006Duct · crackedDURING DAILY INSPECTION, FOUND OIL COOLER BLOWER CRACKED. (X)SDR R7MR32719Horn · inoperativeLOW VOLUME(WEAK). REPLACED WITH NEW UNIT, CORRECTED PROBLEM.SDR 20001108SH040Turbine Wheel · damagedDURING APPROACH TO LAND, PILOT EXPERIENCED A LOUD CONTINUOUS NOISE COMING FROM THE ENGINE. ALL ENGINE INSTRUMENTS WERE NORMAL. ENGINE WAS INSPECTED BY MAINT, NO OBVIOUS MALFUNCTIONS WERE NOTED. DURING ENGINE RUN-UP TO ISOLATE ENGINE NOISE, THE ENGINE CHIP DSDR 20001113SH010Pinion Gear · making metalDISASSEMBLED GEARBOX DUE TO METAL IN OIL. CLEANED AND INSPECTED, FOUND EXCESSIVE GALLING ON PINION GEAR AND TORQUEMETER GEAR TEETH. PINION GEAR HAD EXCESSIVE GALLING ON GEAR TEETH DUE TO IMPROPER MESHING OF T/M AND PINION GEARS. SECONDARY DAMAGE: T/M GEAR SDR 20001025SH017Pinion Gear · failedDISASSEMBLED GEARBOX DUE TO METAL IN OIL. CLEANED AND INSPECTED, FOUND EXCESSIVE GALLING ON PINION GEAR AND T/M GEAR TEETH. PINION GEAR HAD EXCESSIVE GALLING ON GEAR TEETH DUE TO IMPROPER MESHING OF T/R AND PINION GEAR. SECONDARY DAMAGE: T/M GEAR P/N 68936SDR 20001218SH005Relief Valve · failedDURING ANNUAL INSPECTION, HARDWARE WAS FOUND IN AIRFRAME ANTI-ICE FUEL FILTER. AFTER CONSULATION WITH BELL PRODUCT SUPPORT, IT WAS THOUGH TO HAVE COME FROM THE FILTER BOWL. INSPECTION OF THE FILTER BOWL AND FILTER HEAD FOUND NO DISCREPANCIES. INSPECTED AFT SDR 20000620SH030Connector · reads high*****MICKEY****,PART LOCATION: TRANSMISSION OIL PRESSURE MANIFOLD*****PILOT REPORTED A HIGH OIL PRESSURE INDICATION (110 PSI) ON THE TRANSMISSION OIL PRESSURE INDICATOR. THIS READING WAS CAUSED BY DIRT/CORROSION INSIDE OF AN ELECTRICAL CONNECTOR ON THE SYSTESDR 20001026SH001Gear · brokenCHIP LIGHT WAS DETECTED ON AIRCRAFT. CHIP DETECTORS WERE PULLED AND INSPECTED. LARGE PIECE OF GEAR TOOTH WAS FOUND ON PLUG. LARGE PIECE OF GEAR TOOTH BROKE OFF DURING FLIGHT. CAUSE FOR BROKEN GEAR TOOTH WAS DUE TO EXCESSIVE GALLING EXTENDING UP TO FORWARD SDR 20000510SH015Bearing · frettedWHILE PERFORMING SCHEDULED LUBRICATION OF TAIL ROTOR HANGER BEARINGS, MECHANIC NOTICED METALLIC FRETTING DUST AROUND TAIL ROTOR GEARBOX MOUNTING AREA. FURTHER INVESTIGATION REVEALED MOVEMENT BETWEEN TAIL ROTOR GEARBOX AND TAILBOOM. THIS MALFUNCTION IS UNDER ISDR 20000412SH031Drive Shaft · vibrationDURING FLIGHT, A VIBRATION WAS NOTICED. FOUND A SECTION APPROXIMATELY 3 INCHES LONG HAD BROKEN OFF FROM ONE OF THE FLEX FRAMES. THE SECTION PUNCTURED THE ROOF PANEL AND NICKED THE FUEL VENT LINE. (X)SDR 20000622SH025Fuel Control · failedSTART PROBLEMS, I.E., (NON-STARTS, ERRATIC STARTS). CHANGED HMU. OPS NORMAL PER MM (ALLISON). (X)SDR 20000804SH022Pinion Gear · galledPINION GEAR HAS EXCESSIVE GALLING ON GEAR TEETH, POSSIBLY DUE TO EXCESSIVE TORQUE ON ENGINE, GEAR CANNOT SUSTAIN LOAD. (X)SDR CA000215011Scroll · cracked(CAN) COMPRESSOR SCROLL FOUND CRACKED. FAA MADE AWARE OF THE PROBLEM THROUGH ALLISON ROLLS ROYCE. .SDR HEEA065861Hmu · malfunctionedHMU REMOVED DUE TO FADEC DEGRADE LIGHT AND FOUND ROLL PIN BROKEN UPON 300 HOUR BACKLASH INSPECTION.SDR HEEA065862Hmu · damagedSHEARED DRIVE SHAFT PIN.SDR CA000215010Impeller · failedCOMPRESSOR IMPELLER FAILED, FAA MADE AWARE OF THE PROBLEM THROUGH ALLISON ROLLS ROYCE.SDR 2000ZZZX812Housing · mismanufacturedDEFECT FOUND WHEN OLD COATING WAS REMOVED. FOUND THICKNESS OF PARENT METAL BELOW SPECS (PART WAS MANUFACTURED BELOW MINIMUM SPECS).SDR HEEA065476Hmu · failedRESTART FAULT AND DEGRADE LIGHTS ILLUMINATED. ENGINE RPM HAD TO BE REDUCED FROM 100 PERCENT TO CUT OFF IN MANUAL MODE (WOULD NOT RESPOND IN AUTO) DAILY OVERSPEED CHECK WOULD NOT WORK. (REMOVED FROM AIRCRAFT) INSTALLED SERVICEABLE HMU.SDR HEEA065430Valve · stuckVALVE ASSEMBLY REMOVED DUE TO INOPERATIVE. STUCK CLOSED. INSPECTION DETERMINED BURNT COIL P/N V105-22.SDR HEED065708Filter · damagedTRANSMISSION OIL FILTER ELEMENT, O-RINGS P/N M832481-024.SDR 20000502SH007Gear · damagedDISASSEMBLED, CLEANED, AND INSPECTED. FOUND SPALLING AND GALLING ON GEAR TEETH. TM GEAR HAS EXCESSIVE SPALLING AND GALLING ON GEAR TEETH POSSIBLY DUE TO IMPROPER MESHING OF TM AND PINION GEARS. SECONDARY DAMAGE. PINION GEAR, PN 6893672, SN 77723, TT 1,196.5SDR 2000ZZZX153Nr 2 Bearing · making metalENGINE CHIP LIGHT CAME ON. CHIP PLUGS INSPECTED AND FOUND EXCESSIVE METAL PARTICLES ON BOTH PLUGS. ENGINE REMOVED AND SENT IN FOR REPAIR. CAUSE UNKNOWN AT THIS TIME.SDR 99ZZZX4403Signal Condition · intermittentPILOTS REPORTED AN INTERMITTENT PROBLEM WITH THE RIGHT FUEL TRANSFER CAUTION LIGHT COMING ON AND THE FUEL QUANTITY GAUGE GOING BLANK. SUBMITTER STATED PROBLEM WAS IN PN 407-375-016-101 SIGNAL CONDITIONER. DEFECT CAUSE UNKNOWN.SDR 99ZZZX4409Fcu · leakingFUEL CONTROL LEAKING AT AMBIENT AIR PASSAGE. 1-2 DROPS AFTER START. INTERNAL LEAKAGE.SDR HEEA064974Connector · damagedN2 OVERSPEED TO 118.35 PERCENT, UNINITIATED ON GROUND.SDR HEEA064975Connector · damagedN2 OVERSPEED TO 118.35 PERCENT, UNINITIATED ON GROUND. SUBMITTER SUGGESTED POSSIBLE SYSTEM FAILER.SDR HEEA064976Switch · malfunctionedN2 OVERSPEED TO 118.35 PERCENT, UNINITIATED ON GROUND. SUBMITTER SUGGESTED POSSIBLE SYSTEM FAILER. SSDR 20000622SH023Fuel Control · leakingFUEL CONTROL (HMU) FOUND LEAKING AT AMBIENT AIR PASSAGE. LEAK AMOUNT (MOIST TO 1 OR 2 DROPS) AFTER LEAK CHECK, INTERNAL LEAKAGE. (X)SDR CA991208070Support · cracked(CAN) FOLLOWING OVERTORQUE INSPECTION (113 PERCENT FOR .1 SEC), CRACKS WERE NOTICED (3) IN THE BEND RADIUS OF THE HORIZONTAL STABILIZER UPPER SUPPORTS. PARTS WERE REPLACED IAW BELL REPAIR SCHEME. NO OTHER DEFECTS NOTED. REPAIR SCHEME INCLUDES INSTRUCTION
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