Allison 250-C20
Service difficulty reports · 945
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 = '250C20' 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 = '250C20' 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 CA970311036Switch · no indication(CAN) NO PRESSURE OFF INDICATION.SDR CA960704002Stiffener · cracked(CAN) STIFFENER FOUND CRACKED. CRACK ORIGINATING FROM LOWER ONE OF FOUR HUCK RIVETS AT UPPER END OF STIFFENER.SDR CA960812011Swashplate · incorrect assy(CAN) SWASHPLATE WAS REPLACED AND TILT FRICTION CHECKED, FOUND TO BE WITHIN LIMITS. AFTER A GROUND RUN THE PILOT COMPLAINED OF THE CYCLIC BEING EXTREMELY HARD TO MOVE WITH HYDRAULICS ON AND ALMOST IMPOSSIBLE WITH HYDRAULIC OFF. INVESTIGATION REVEALED THAT THE SDR CA960826035Shim · uniball bind(CAN) ON INSTALLATION AFTER REPAIR BY OVERHAUL FACILITY, SWASHPLATE TILT FRICTION CHECKED AND FOUND WITHIN LIMITS AFTER GROUND RUN, PILOT REPORTED CYCLIC HARD TO MOVE WITH HYDRAULICS ON, ALMOST IMPOSSIBLE TO MOVE WITH HYDRAULICS OFF. SWASHPLATE HAD BEEN SHIMMSDR CA960619029Lower Box Beam · cracked(CAN) CRACK FOUND IN LOWER BOX BEAM SKIN JUST OVER TWO INCHES LONG COMING FROM THE SECOND RIVET FORWARD LEFT HAND SIDE FROM AFT.SDR CA970311039Web · cracked(CAN) LOWER WEB ON CABIN ROOF BOX BEAM CRACKED.SDR CA960812012Transmission · leaking(CAN) AFTER A SHORT FLIGHT PILOT NOTICED MAJOR AMOUNT OF OIL COMING FROM TRANSMISSION AREA. ENGINEER DISCOVERED MAGNETIC SEAL.LEAKING.SDR CA960826034Seal · leaking(CAN) DURING PREFLIGHT INSPECTION, PILOT NOTICE A SIGNIFICANT AMOUNT OF OIL IN THE TRANSMISSION AREA. MAGNETIC SEAL LEAKING, REPLACED.SDR CA960619025Trunnion Bearing · excess play(CAN) PITCH HORN TRUNNION BEARING REPLACED DUE TO AXIAL PLAY IN THE PITCH LINK BOLT BEARING.SDR CA960619022Governor · fluctuating(CAN) RPM FLUCTUATING AT TOP END.SDR CA960619023Turbine Assy · cracked(CAN) ENGINE FAILED POWER CHECK. TROUBLESHOOTING DISCOVERED FIRST STAGE STATOR VANES CRACKED, 5 IN TOTAL. TURBINE ASSEMBLY REPLACED, AND AIRCRAFT RETURNED TO SERVICE.SDR CA960619018Governor · faulty(CAN)GOVERNOR WOULD NOT ALLOW ENGINE TO REACH 100 PERCENT NR. WITH RIGGING IN LIMITS AND ENGINE WARM 100 PERCENT BARELY ATTAINABLE.SDR CA960619019Turbine Assembly · cracked(CAN) SUSPECT THIS WAS A VIBRATION SOURCE THAT CAUSED COMPRESSOR ANTI-ICE PORT TO CRACK AND OUTER COMBUSTION CAN TO CRACK 2". THERE WERE ONLY 88.3 HOURS SINCE FIRST AND SECOND STAGE WHEELS WERE REPLACED.SDR CA960619020Compressor Assy · cracked(CAN) DURING TROUBLESHOOTING OF LACK OF POWER PROBLEM, A CRACKED FORWARD SUPPORT FOR ANTI-ICE PORT WAS FOUND. THERE WERE 276.7 HOURS SINCE REPAIRED FOR VIBRATION PROBLEM. UNIT REPLACED AND RETURNED TO SERVICE.SDR CA960619030Combustion Can · cracked(CAN) A CRACK OVER 2" WAS FOUND WHILE TROUBLESHOOTING FOR LOW POWER. CRACK WAS IN THE AREA OF THE FUEL NOZZLE/IGNITOR PORTS. CRACK DID NOT OCCUR ON A WELD LINE. APPEARED TO BE CAUSED BY VIBRATION.SDR 96ZZZX3486Bearing · frozenDURING TEAR DOWN INVESTIGATION OF UNIT, FOUND 2523240 BEARINGS FROZEN CAUSING FLYWEIGHTS TO STICK.SDR CA960606006Hyd Socket · leaking joint(CAN) SMALL LEAK AT JOINT CONNECTION.SDR CA960606008Hanger Bearing · worn(CAN) WEAR AT THE INSIDE OF SLEEVE AND #1 HANGER.SDR CA960606007Bearing · loose(CAN) #1 HANGER BEARING LOOSE. EXCESSIVE PLAY BETWEEN INNER AND OUTER RACE.SDR CA960619016Ignition Exciter · failed(CAN) IGNITION EXCITER UNIT FAILED, NO SPARK TO IGNITER PLUG. UNIT REPLACED, AIRCRAFT RETURNED TO SERVICE.SDR CA960620007Blower Assembly · shorting(CAN) BLOWER ASSEMBLY WAS REMOVED FOR ROUTINE 600 HOUR BENCH CHECK. BEFORE DISASSEMBLY IT WAS NOTED THAT THE LOCKWIRE SECURING THE ASSEMBLY BOLTS WERE HEAT DISCOLOURED. THE BLOWER ONLY USES 28 VDC, IT WAS THOUGHT THAT THE GROUND CONNECTION VIA AIRCRAFT WIRING SDR 96ZZZX5362Coupling · damaged splinesTHE DEFECT WAS DISCOVERED DURING INSPECTION OF THE PART ON RECEIPT FROM A 3RD PARTY VENDOR. THE ALLISON GAS TURBINE 250-C20 SERIES OVERHAUL MANUAL PROVIDES IN TABLE VI-19 INSPECTION CRITERIA FOR POWER TURBINE COUPLINGS. ITEM 58 OF THIS TABLE, ON PAGE 6-119 ASDR CA970311032Attach Fitting · cracked(CAN) UPPER TAILBOOM ATTACHMENT FITTING CRACKED.SDR CA960530004Tie Rod · sheared(CAN) THE COUNTERWEIGHT ROD SHEARED AT THE BASE OF THE SPACER AND DRAG BRACE ATTACHMENT ON THE MAIN ROTOR HEAD. THE COUNTERWEIGHT, WASHERS AND SPACER LEFT THE AIRCRAFT CAUSING A VIBRATION IN THE AIRCRAFT AND FLIGHT CONTROLS. THE TIE ROD IS SUBJECT TO A 300 HOUSDR CA960604020Turbine · seized(CAN)INSTALLED TURBINE ON AIRCRAFT AND COMPLETED A GROUND RUN AND TEST FLIGHT. TURBINE CHECKED OK. A SECOND START WAS ATTEMPTED BUT THERE WAS NO NR UPON REACHING 30 PERCENT N1. ANOTHER START WAS ATTEMPTED,BUT AGAIN THE NR WOULD NOT ROTATE. TURBINE RETURNED TO SDR CA960619014Fcu · failed(CAN) UNABLE TO ADJUST FCU FOR HOT STARTS. ALSO NO NOTCH IN T.O.T. DURING START. FCU REPLACED AND RETURNED TO SERVICE. TIME THIS INSTALLATION, 89.2 HOURS. CYCLES THIS INSTALLATION, 130 HOURS.SDR 96ZZZX2943Engine · making metalNR 2 ENGINE REMOVED DUE TO EXCESSIVE CHIP LIGHTS. THIS IS THE 3RD OCCURRENCE WITH THIS ENGINE. ENGINE TT, 336.5 HRS SINCE NEW.SDR ERAA96236Governor · defectiveGOVERNOR WAS SENT FOR OVERHAUL AND RETURNED TO ERA 12/19/94. GOVERNOR IS VERY SLOW RESPONDING.SDR CA970311029Support · cracked(CAN) CRACKS AROUND LANDING GEAR ATTACHMENTS.SDR CA970311030Engine Mount · cracked(CAN) MOUNT FITTING CRACKED.SDR CA960619011Mount Fitting · sheared(CAN) FITTING WAS SHEARED AT MOUNT LOCATION ALONG WITH EXCESSIVE WEAR ON STUD.SDR 96ZZZX2607Bearing · failedPART IS AN FAA PMA BEARING. BEARING CAGE CAME APART CAUSING 'CHIP' LIGHT. BEARING FAILURE ALSO CAUSED SPALLING OF THE INNER RACE ON SPUR ADAPTER GEARSHAFT. THIS GEARSHAFT COUPLES (DRIVES) TURBINE AND COMPRESSOR.SDR CA960619008Compressor · seized(CAN)AFTER FLIGHT TEST, PILOT WAS UNABLE TO RESTART ENGINE. TROUBLESHOOTING DETERMINED COMPRESSOR ASSEMBLY WAS SEIZED. UNIT REPLACED AND AIRCRAFT RETURNED TO SERVICE. TIME THIS INSTALLATION, 0.3 HOURS.SDR ERAA96226Nozzle · defectiveNOZZLE SENT FOR O/H AND RET'D 4-3-96 WITH T.I.R. ON SEAL AND BLADE PATH BEYOND ALLOWABLE LIMITS.SDR ERAA96224Governor · defectiveGOVERNOR WAS SENT FOR OVERHAUL 07/18/94 . UNIT NOW HAS 401.3 T.S.O. AND WILL NOT BEEP TO 99%.SDR ERAA96225Sump Cover · leakP.T. SUMP COVER WAS SENT FOR OVERHAUL . PART HAS 28.7 HRS T.S.O. AND IS LEAKING AT BOLT HOLE AS MARKED .SDR CA960502028Gearbox · wearing(CAN) OIL CONSTANTLY DARK AND PASTE FOUND ON CHIP DETECTOR REPEATEDLY.SDR CA960503103Latch Fitting · cracked(CAN)DURING OVERHAUL OF MAIN ROTOR HUB ASSEMBLY, A 3/4" CRACK WAS FOUND IN ONE EAR OF LATCH FITTING. TTSN OF MAIN ROTOR HUB WAS 12668 HOURS.SDR CA960412006Nozzle · cracked(CAN) FORCED LANDING DUE TO ENGINE FAILURE. TEARDOWN REVEALED 2ND STAGE TURBINE NOZZLE CRACKED AROUND THE INSIDE CIRCUMFERENCE. SPECIFICALLY THEY WERE IN THE BEND RADIUS OF THE 2ND STAGE NOZZLE DIAPHRAGM. THESE NOZZLES HAVE BEEN SENT TO COMPANY FOR ANALYSIS.SDR CA960412021Hose Assembly · fractured(CAN)HYDRAULIC LINE FROM MALE QUICK DISCONNECT TO HYDRAULIC POWER PACK (PRESSURE LINE, PACK TO FILTER). LINE FOUND FRACTURED INTERNALLY (FLEX LINE), AT AREA WHERE IT IS CLAMPED TO CABIN ROOF/PYLON FLOOR.SDR ERAA96216Governor · malfunctionGOVERNOR WAS OVERHAULED ON 11/6/95. GOVERNOR WILL NOT MAINTAIN RPM UNDER HOOD.SDR ERAA96217Governor · defectiveTORQUE SPLITS. LAGS WILL NOT RECOVER. N2 BLEEDS OFF OVER 68% TORQUE. GOVERNOR WAS SENT FOR OVERHAUL 7/21/95SDR CA960404014Engine Mount · corroded(CAN) COLLET WAS MISSING FROM HIGH LOCK. WHEN HIGH LOCK REMOVED IT WAS FOUND COMPLETELY CORRODED AND CORROSION COULD BE SHAKEN OUT OF HOLE. AIRCRAFT HOURS 11806.SDR CA960404015Tube · worn(CAN) TUBE PARTIALLY WORN DUE TO CONTACT WITH HEATER HOSE. TUBE REPLACED, HEATER HOSE RELOCATED.SDR CA960502024Stiffener · cracked(CAN)CRACKS FOUND AT ANCHOR NUT HOLES WHICH MOUNT LEFT SIDE OF OIL COOLER BLOWER TO FUSELAGE.SDR CA960502029Fcu · failure(CAN) ENGINE STARTING TEMPS WERE TOO HIGH IN 35 PERCENT TO 50 PERCENT NG RANGE. START DERICH ADJUSTED TO FULL DECREASE. FCU REPLACED, AIRCRAFT RETURNED TO SERVICE.SDR 96ZZZX2537Turbine · making metalENGINE CHIP LIGHT ILLUM ON FINAL APPROACH. MECHANIC INSPECTED ENG CHIP PLUGS & FND FUZZ & LIGHT METAL ON UPPER CHIP PLUG. PENALTY RUN ACCOMPLISHED & WHILE ON SHUT DOWN AT APPROX 35-40 PERCENT N1, MECHANIC HEARD NOISE (HVY GRINDING) FROM ENG AREA. MECHANIC MSDR CA970311031Bulkhead · cracked(CAN) CRACKS AND PULLED RIVETS ON LOWER SUPPORT. LEFT HEAD BULKHEAD P/N 206-031-107-117H CRACKED. INNER SKIN CRACKED AT FS98 AND BL9.SDR CA960502020Liner · distorted(CAN) DURING INSPECTION, FOUND DOME OF COMBUSTION LINER TO BE DISTORTED. COMBUSTION LINER REPLACED AND AIRCRAFT RETURNED TO SERVICE.SDR CA960502010Turbine Assy · failure(CAN) ENGINE DEVELOPING LOW POWER AND HIGH TOT, POWER ASSURANCE CHECK FAILED. TURBINE ASSEMBLY REPLACED, AIRCRAFT RETURNED TO SERVICE.
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