Allison 250-C20F

Service difficulty reports · 87

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 = '250C20F'
  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.

SDR CA001012005Drive Shaft · sheared(CAN) WHEN PILOT TRIED TO START ENGINE THERE WAS NO N1 INDICATION. STARTER GENERATOR COULD BE HEARD RUNNING. WHEN STARTER/GENERATRO WAS REMOVED, DIRVE SHAFT WAS FOUND SHEARED AT NECK. SPLINED END WAS REMOVED FROM ENGINE GEARBOX. REPLACEMENT STARTER GENERATOR WSep 21, 2000 · Aerosp AS355F1 · Starter-GeneratorSDR CA000706026Housing · sheared(CAN) DURING HUB REMOVAL TO C/W SB 65.00.38 (T/R SPYDER BEARING KIT INSTALLATION) THE KEY THAT ALIGNS HUB TO T/R SHAFT WAS FOUND SHEARED & THE HUB HAD SPUN APPROX. 110 DEGREES. THE T/R LONG DRIVE SHAFT P/N 350A34-0110-07 WAS FOUND TO HAVE AN APPROX 60 DEGREES Jun 18, 2000 · Aerosp AS355F1 · Tail Rotor HeadSDR AU000468Starflex · cracked(AUS) MAIN ROTOR STARFLEX HEAD ASSEMBLY CRACKED.Apr 28, 2000 · Aerosp AS355F1 · Main Rotor HeadSDR AU000397Bearing · failed(AUS) TAIL ROTOR DRIVESHAFT BEARING SPINNING ON THE DRIVESHAFT WEARING A GROOVE INTO THE SHAFT.Apr 27, 2000 · Aerosp AS355F · Tail Rotor Drive ShaftSDR 2000ZZZX802Valve · looseBEVEL REDUCTION GEAR LOST OIL PRESSURE WHEN AIRCRAFT LANDING ON OIL RIG. RELIEF VALVE UNSCREWED FROM BEVEL REDUCTION GEAR COMPLETELY CAUSING LOSS OF OIL PRESSURE. RETAINER TOO LARGE TO LOCK RELIEF VALVE PROPERLY, P/N 704A34-631-014. INSTALLED CORRECT RETAINFeb 7, 2000 · N5773X · Aerosp AS355F · Turbine Engine Reduction GearSDR AU000039Bearing · failed(AUS) ENGINE NR 5 BEARING FAILED. METAL CONTAMINATION OF ENGINE OIL SYSTEM.Jan 3, 2000 · Aerosp AS355F1 · Turbine SectionSDR 2000ZZZX768Gear · wornGEAR TEETH WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.Sep 24, 1999 · N53LH · Aerosp AS355F1 · Turbine Engine Compressor SectionSDR 99ZZZX3710Nozzle Shield · separatedOPERATOR REPORTED ENGINE LOW POWER. ON INVESTIGATION FOR LOW POWER, THE NR 1 NOZZLE SHIELD WAS FOUND WITH THE DOME COMPLETLY SEPARATED FROM SHIELD INNER RING/BAND. THIS FAILURE RESULTED IN DAMAGE TO NR 1 TURBINE NOZZLE WHICH MAY HAVE TO BE SCRAPPED. THIS FASep 3, 1999 · Turbine SectionSDR 98ZZZX2097Filter · contaminatedFILTER WAS CONTAMINATED WITH METAL AND OTHER DEBRIS. FILTER WAS NOT CRUSHED, ABOUT 20 PERCENT CONTAMINATION.May 20, 1998 · N105HH · Bolkms BO105S · Engine Fuel DistributionSDR 98ZZZX1683Control Cable · frayedCABLE FRAYED AND BEARING WORN OUT CAUSING BINDING OF N2 LINKAGE. SUBMITTER SUGGESTED INSTALLING A BETTER, MORE RELIABLE SYSTEM.Apr 27, 1998 · N942MS · Aerosp AS355F2 · Fuel Controlling SystemSDR AU971377Heat Shield · cracked(AUS) NO1 ENGINE HEAT SHIELD CRACKED.Oct 28, 1997 · Aerosp AS355F1 · Turbine Engine Combustion SectionSDR CA971110017Suspension Bar · debonded(CAN) ON DAILY INSPECTION IT WAS NOTED THAT RIGHT SIDE TRANSMISSION FORWARD SUSPENSION BAR AND THE AFT RIGHT SIDE SUSPENSION BAR LOWER BEARINGS HAD BECOME DEBONDED FROM THE METAL BAR.Oct 25, 1997 · Aerosp AS355F1 · Main Rotor Transmission MountSDR AU971526Fitting · cracked(AUS) RH SLIDING DOOR REAR ROLLER MOUNT CRACKED AND BROKEN. WHEN THE DOOR WAS OPENED THE DOOR ATTEMPTED TO SEPARATE FROM THE AIRCRAFT BUT WAS HELD IN PLACE BY A PASSENGER.Oct 12, 1997 · Aerosp AS355F1 · Passenger/Crew DoorsSDR 97ZZZX4698Sensor · intermittentSENSOR ASSY UNIT OPERATES INTERMITTENTLY WHEN START SWITCH IS ENGAGED. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.Aug 28, 1997 · N53LH · Aerosp AS355F1 · Ignition SystemSDR 97ZZZX2760Fuel Pump · leakDURING CRUISE FLIGHT, NR 1 ENGINE T4, NG, TORQUE AND NR DROPPED OFF-LINE. TROUBLESHOOTING REVEALED ENGINE DRIVEN FUEL PUMP LEAKING FROM SEAL DRAIN.May 1, 1997 · N372E · Aerosp AS355E · Engine Fuel PumpSDR AU970664Mount · cracked(AUS) MAIN TRANSMISSION BI-DIRECTIONAL MOUNT CRACKED - FOUND DURING INSPECTION IAW AD/AS355/47Apr 1, 1997 · Aerosp AS355F1 · Main Rotor Transmission MountSDR AU970145Blade · debonded(AUS) MAIN ROTOR BLADE INBOARD TRIM TAB DEBONDED AND LOOSE ON BLADEFeb 6, 1997 · Aerosp AS355F1 · Main Rotor BladesSDR CA960916002Crossbeam · cracked(CAN) CRACKS FOUND IN MGB SUSPENSION CROSSBEAM END LUGS AS DESCRIBED IN TELEX SB 05.00.29 AND AD 96-155-053(B).Aug 14, 1996 · Aerosp AS355F2 · Main Rotor Transmission MountSDR CA960916003Crossbeam · cracked lugs(CAN) CRACKS FOUND IN MGB SUSPENSION CROSSBEAM END LUGS AS DESCRIBED IN TELEX SB 05.00.29 AND AD 96-155-053(B).Aug 14, 1996 · Aerosp AS355F1 · Main Rotor Transmission MountSDR CA960910039Turbine Assy · damaged(CAN) DURING OPERATIONS, THE PILOT HEARD A VIOLENT NOISE FROM HIS RIGHT SIDE. INSTRUMENTS CONFIRMED ENGINE WAS LOST. PILOT PICKED UP AIRSPEED AND WAS ABLE TO CARRY OUT A ONE ENGINE LANDING. PRELIMINARY INVESTIGATION REVEALED SUBSTANTIAL DAMAGE TO THE FIRST Aug 13, 1996 · Aerosp AS355F1 · Turbine SectionSDR CA960909006Crossbeam · cracked(CAN) CRACKS FOUND IN MGB SUSPENSION CROSSBEAM END LUGS AS DESCRIBED IN TELEX SB 05.00.29 AND AD 96-155-053(B).Jul 27, 1996 · Aerosp AS355F1 · Main Rotor Transmission MountSDR HEEA967584Wheel · crackedENGINE REMOVED DUE TO HIGH OIL CONSUMPTION. UPON INSPECTION OF TURBINE PARTS DUE TO LOW POWER ON TEST CELL NOTED THE FOLLOWING: ONSET OF SULPHIDATION ON 20 EACH 1ST STAGE WHEEL BLADES AND CRACKED IN RIM AREA. SCRAPPED 1ST STAGE WHEEL.Jul 16, 1996 · N6040U · Aerosp AS355F2 · Turbine SectionSDR 96ZZZX3405Union · crackedREMOVED FOR A FUEL PUMP BYPASS CHECK DUE TO DELAYED LIGHT-OFFS ON A C20F ENGINE. UNION WAS FOUND CRACKED AFTER LOOSENING B-NUT. BYPASS CHECK COMPLETED AND CHECK PASSED, STILL HAD NO RESOLVE TO DELAYED LIGHT-OFFS. INSTALLED UNION AND FUEL TUBE ASSEMBLY AND TMay 15, 1996 · N911TM · Aerosp AS355F1 · Engine Fuel DistributionSDR CA960419001Governor · missing(CAN)CIRCLIP AND WASHER SECURING DRIVE GEAR TO GOVERNOR SPLINED DRIVE FOUND MISSING WHEN GOVERNOR REMOVED FOR OVERHAUL. THIS ALLOWS THE DRIVE GEAR TO FLOAT BACK AND FORTH IN THE ENGINE GEARBOX DRIVE.Apr 10, 1996 · Aerosp AS355F1 · Turbine GovernorSDR HEEA966917Tube Assy. · defectiveENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: OIL TRANSFER TUBE FAILED DIMENSIONAL CHECK IN ACCORDANCE WITH CEB1307. INSTALLED A NEW OIL TUBE ASSEMBLY.Apr 4, 1996 · N5774M · Aerosp AS355F1 · Turbine Engine Reduction GearSDR HEEA966860Wheel · blade erodedENGINE REMOVED DUE TO #1 AND #2 WHEEL CYCLE RETIREMENT. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: 1ST STAGE WHEEL BLADES MINOR SULFIDATION AND ERODED LEADING EDGE. SCRAPPED 1ST STAGE WHEEL.Mar 19, 1996 · N5793Z · Aerosp AS355F1 · Turbine SectionSDR CA960306013Mount · cracked(CAN)LEFT HAND FORWARD MOUNT ASSEMBLY FOUND CRACKED.Feb 16, 1996 · Aerosp AS355F1 · Fuselage Miscellaneous StructureSDR 96ZZZX23584th Stage Nozzle · defectiveUPON 1,750-HOUR INSPECTION, FOUND DIAPHRAGM CRACKED AND THE PART WAS SENT FOR OVERHAUL.Feb 2, 1996 · N378E · Aerosp AS355F · Turbine SectionSDR HEEA966448Sensor Assy · malfunctionAUTO RELIGHT COMES ON IN FLIGHT. REPLACED WITH SERVICEABLE TRANSDUCER.Jan 15, 1996 · N5796S · Aerosp AS355F1 · Ignition SystemSDR HEEA966330Blade · errosionENGINE REMOVED DUE TO LOW POWER AND OIL LEAKING. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: 50% OF 1ST STAGE WHEEL SULFIDATED AND DELAMINATED ON FORWARD SIDE OF BLADES AND EROSION OF ALL LEADING EDGES AND BLADE TIPS. SCRAPPED 1ST STAGE WHEEL.Jan 2, 1996 · N5791M · Aerosp AS355F1 · Turbine SectionSDR HEEA955480Tube Assy · making metalENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: BELOW CEB1307 REQUIREMENTS ON TUBE ASSEMBLY. INSTALLED NEW TUBE ASSY. PART RETURNED TO ALLISON FOR CEB1307. REFERENCE: AFA#24405A (PART IS OUT OF CALENDAR DATE AND Jul 28, 1995 · N5793Y · Aerosp AS355F1 · Turbine Engine Reduction GearSDR HEEA955378Bleed Valve · defective#1 ENGINE COMPRESSOR SURGES WITH THROTTLE APPLICATION. REPLACED BLEED VALVE AND RETURNED TO SERVICE.Jul 20, 1995 · N5793Y · Aerosp AS355F1 · Compressor Bleed ValveSDR 95ZZZX4039Gearbox · failedINBOUND FOR OFFSHORE PLATFORM, PILOT REPORTED NR 1 ENGINE CHIP LIGHT ILLUMINATED, AIRCRAFT YAWED, ENGINE FLAMED OUT. LANDED AT ONSHORE WITHOUT INCIDENT. INVESTIGATION REVEALED BOTH ENGINE ACCESSORY GEARBOX CHIP PLUGS COVERED WITH METAL. N1 DOES NOT TURN FREEJun 22, 1995 · N5774M · Aerosp AS355F1 · Turbine Engine Accessory DriveSDR 95ZZZY1468Clock · defectiveTIMER RESET BUTTON BROKEN OFF. REPLACED CLOCKJun 12, 1995 · N321HC · Aerosp AS355F1 · Independent InstrumentsSDR 95ZZZX2790Drive Shaft · wornDURING DISASSEMBLY OF UNIT FOR OVERHAUL, FOUND EXCESSIVE PITTING AND WEAR OF EXTERNAL SPLINES ON PUMP END OF SHAFT (INSIDE OF PUMP). POSSIBLY CAUSED BY LACK OF MOLYDEM DISULFIDE GREASE ON SPLINES.May 10, 1995 · N376E · Aerosp AS355F1 · Engine Fuel PumpSDR HEEA954703Gearshaft · spalledENGINE REMOVED DUE TO MAIN ENGINE DRIVESHAFT FAILURE. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: SPALLING ON GEAR TEETH OF BOTH GEARSHAFTS. INSTALLED NEW GEARSHAFT. SEE MMIR #4704 FOR OTHER GEARSHAFT INFORMATION.Apr 7, 1995 · N5796T · Aerosp AS355F1 · Turbine Engine Reduction GearSDR HEEA954704Gearshaft · spalledENGINE REMOVED DUE TO MAIN ENGINE DRIVESHAFT FAILURE. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: SPALLING ON GEARTEETH OF BOTH GEARSHAFTS. INSTALLED NEW GEARSHAFT. SEE MMIR #4703 FOR OTHER GEARSHAFT INFORMATION.Apr 7, 1995 · N5796T · Aerosp AS355F1 · Turbine Engine Reduction Gear
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