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 95ZZZX2368Governor · defective'BEEP' RANGE IS ERRATIC. RPM JUMPS FROM POINT-TO-POINT DURING SMOOTH GOVERNOR TRIM MOTOR ACTUATION. UNIT SENT IN FOR REPAIR ON ALLISON 250 REPORT NR A160118.SDR 95ZZZX2367Compressor · stallsCOMPRESSOR STALLS WITH SLIGHT BUT RAPID POWER CHANGES. NOTE: THIS ENGINE WAS REMOVED FROM ANOTHER A/C WITH THESE SYMPTOMS AND ANOTHER ENGINE INSTALLED SO IT COULD START A JOB. THIS COMPRESSOR WAS INSTALLED FOR TROUBLESHOOTING WHEN THIS ENGINE WAS INSTALLED SDR HEEA954822Fuel Control · malfunction#1 ENGINE OSCILLATING 10% ABOVE 55% TORQUE. REPLACED WITH SERVICEABLE FUEL CONTROL.SDR 95ZZZX2166Compressor · stallsCOMPRESSOR STALLS WITH SMALL, BUT RAPID POWER CHANGES. UNIT SENT IN FOR REPAIR.SDR 95ZZZX3744Bearing · failedNR 5 BEARING BALL RETAINER FLAKING OFF. THE BEARING MANUFACTURED BY SUPERIOR TURBINE.SDR EGRA9524Fuel Control · malfunctionFUEL CONTROL REQUIRES INTERNAL ADJUSTMENT TO START DERICH AND ACCEL. FUEL CONTROL SENT TO AIRWORK FOR REPAIR. UNIT REPAIRED BY AIRWORK UNDER WORK ORDER # V04689. UNIT RETURNED TO KEYSTONE AND PERFORMED OPERATIONAL CHECKS. OP CHECKED GOOD.SDR 95ZZZX2169Governor · defectiveTHE GOVERNOR WOULD NOT HOLD RPM WITH SLIGHT POWER CHANGES. THIS UNIT HAS BEEN SENT IN FOR REPAIR 2 TIMES BEFORE IN THE LAST 239.8 HOURS FOR THE SAME PROBLEM. SEE ALLISON 250 REPORT A160113.SDR 95ZZZX2171Combustion Liner · crackedDURING INSPECTION, FOUND 2 SPOTS BURNED THROUGH AND CRACKED AT 6:30 AND 2:00, 1 INCH FORWARD OF SKIRT LOUVERS.SDR HEEA954692Tube Assy. · defectiveENGINE WAS REMOVED DUE TO OIL LEAK AT AFT T/M BUSHING. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: OIL TRANSFER TUBE FAILED DIMENSIONAL CHECK IN ACCORDANCE WITH CEB 1307. INSTALLED NEW TUBE ASSEMBLY.SDR 95ZZZX2526Actuator · failedNR 2 ACTUATOR FAILED. THIS ACTUATOR HAS 1454.9 HOURS SINCE OVERHAUL AND INSTALLATION. THIRD KNOWN PROBLEM WITH OVERHAULED ACTUATOR 'ALSO SPARE ACTUATOR FAILED'. OVERHAUL FACILITY NEEDS MORE THOROUGH BENCH TEST OR SEEK OTHER VENDOR.SDR 95ZZZX2527Actuator · defectiveIN-FLIGHT FAILURE OF N2 BEEP OF NR 2 ENGINE. INSTALLED OVERHAULED ACTUATOR. CIRCUIT BREAKER TRIPPED, ACTUATOR WAS CAUSE. REPLACED DIODE AND INSTALLED SECOND ACTUATOR FUNCTION CHECK GOOD. 11-23-94 ACTT 3938.0.SDR 95ZZZX2148Governor · malfunctionPILOT COMPLAINED THE ENGINE DROOPED AT HIGH POWER. REMOVED AND REPLACED GOVERNOR, CURED THE PROBLEM. UNIT SENT IN FOR REPAIR ON ALLISON REPORT NR A 160111.SDR 95ZZZX2141Filter · defectiveWHILE TROUBLESHOOTING AN N2 DROOP PROBLEM, FOUND PC AIR FILTER HAD SEVERAL FOLDS OF THE METAL FILTER ELEMENT BROKEN OFF, WITH MANY SMALL PIECES MISSING. PC AIR FILTER CLEANS SENSING AIR GOING INTO BENDIX FUEL CONTROL SYSTEM. GOVERNOR AND FUEL CONTROL HAD TO SDR 95ZZZX2209Engine · making metalNR 1 ENGINE CHIP LIGHT IN-FLIGHT. REDUCED POWER TO NR 1. LANDED WITH BOTH ENGINES ON LINE. FOUND SMALL FLAKES RINGING BOTH PLUGS AND IN FILTERS. ENGINE HAS HISTORY OF LIGHTS. REPLACED ENGINE.SDR RMXA95205531st Nozzle · defectiveDIAPHRAM IMPROPERLY INSTALLED, BOLT HOLES WOULD NOT LINE UP.SDR HEEA954637Engine Assy · chip light#1 ENGINE CHIP LIGHT CAME ON IN FLIGHT. (FOUND METAL ON THE LOWER PLUG) INSTALLED SERVICEABLE ENGINE AND RETURNED AIRCRAFT TO SERVICE.SDR HEEA954563Wheel · sulfidationENGINE REMOVED DUE TO CYCLED 1ST THROUGH 4TH STAGE WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MILD SULFIDATION ON 50% OF TURBINE 1ST STAGE WHEELS BLADES. SCRAPPED 1ST STAGE WHEEL.SDR HEEA954545Wheel · sulfidationENGINE REMOVED DUE TO 1750 HOUR INSPECTION AND TURBINE OVERHAUL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR 95ZZZX2156Bearing · failedNR 5 BEARING FAILED AT THE BALLS RETAINER. CHIP LIGHT CAME ON IN-FLIGHT. NO CAUSE AT THE TIME. THIS PART IS A P.M.A. F.A.A. APPROVED.SDR 95ZZZX5496Bearing · spalledNR 6 MAIN BEARING SPALLING. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM.SDR CA950928001Filter · contaminated(CAN) SUBMITTER SUGGESTS THAT THEY CANNOT COMPLY WITH THE FLIGHT MANUAL REQUIREMENT TO SAMPLE FUEL AT THE ENGINE FUEL FILTER FOR CONTAMINANTS AS REQUIRED BY HUGHES PRE-FLIGHT. FIELD EXPERIENCE HAS INDICATED THAT THE ENGINE FUEL FILTER SAMPLE POINT IS VITAL. SDR ERAA9528Nozzle · crackedTWO ADJACENT CRACKS (AS MARKED) IN VANE 1/4" (6MM) REF PAGE 3-282 TABLE 111-13 ITEM 1 RETURNING NOZZLESDR 95ZZZX1620Engine · failedPILOT REPORTED ENGINE LOST POWER IN MODERATE LEVEL HOVER. AFTER HEARING 3 DULL THUMPS, THE NOSE YAWED AND ACFT BEGAN TO SETTLE. PERFORMED CONTROLLED LANDING INTO 20 FEET OF WATER. ACFT ROLLED INVERTED AND SANK. CAUSE CURRENTLY UNKNOWN. NTSB IS INVESTIGATISDR ERAA9527Nozzle Vane · cracked1ST STAGE NOZZLE TRAILING EDGE VANES CRACKED.SDR 95ZZZX1133Shield · crackedDURING REPLACEMENT OF NR 1 NOZZLE, NOZZLE SHIELD WAS FOUND CRACKED. PART REPLACED AND SENT IN FOR OVERHAUL.SDR 95ZZZX1134Nozzle · crackedNR 1 TURBINE NOZZLE REPLACED DUE TO TRAILING EDGE CRACKING BEYOND LIMITS. UPON REMOVAL, DISCOVERED THE 6823481-7000 ROPE PACKING MISSING. NO INDICATIONS OF POWER LOSS OR TOT RISE. PART RETURNED FOR OVERHAUL.SDR HEEA954392Wheel · sulfidationENGINE REMOVED DUE TO HIGH TOT. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION ON 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR HEEA954394Wheel · sulfidationENGINE REMOVED DUE TO HIGH CYCLED WHEELS. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.SDR HEEA954340Actuator · intermittentINTERMITTENT OPERATION. INSPECTED BY ACCESSORY OVERHAUL SHOP AND FOUND WATER IN UNIT. CLEANED AND REPLACED O-RINGS. ASSEMBLED, TESTED AND RETURNED LINEAR ACTUATOR TO SERVICE.SDR HEEA954304Gearshaft · stepwearENGINE REMOVED DUE TO COMPRESSOR OVERHAUL AND TURBINE 1750 HOUR INSPECTION. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: STEP WEAR BEYOND LIMITS ON SPUR ADAPTER GEARSHAFT FORWARD AND AFT SPLINES. INSTALLED NEW SPUR ADAPTER GEARSHAFT. AFA# 17920ASDR HEEA954184Wheel · sulfidationENGINE REMOVED DUE TO COMBUSTION CASE BAFFLE BROKEN AND ERODED 1ST STAGE NOZZLE. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: MINOR SULFIDATION ON ALL 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL.
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