JASC 7261

Service difficulty reports · 5,126

Reports filed under 7261 · Turbine Engine Oil System, newest first.

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 jasc_code = '7261'
  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 WRNA201300008Housing · damagedDURING FLIGHT FROM IQQ TO MIA PILOTS NOTICED NR 1 ENGINE HAD LOSS OF OIL PRESSURE AND OIL QUANTITY. CREW FOLLOWED SHUTDOWN PROCEDURES FOR NR 1 ENGINE. ON SHUTDOWN CREW NOTED: OIL QTY: 1 QT, OIL TEMP: 156 DEG, OIL PRESSURE: 168. CREW RETURNED TO IQQ WITHOUT Apr 12, 2013 · N952AR · Doug MD11FSDR HALA2013040700034Pressure Switch · failedAIR TURN BACK, RT OIL FILTER ANNUNCIATOR CAME ON IN CLIMB. FOLLOWED SHUTDOWN PROCEDURE RETURNED TO DEPARTURE. REPLACED SCAVANGE OIL FILTER ELEMENT AND OIL PRESSURE DIFFERENTIAL PRESSURE SWITCH IAW FIM TASK 79-35 FAULT TREE 803. LEAK CHECK OPS CHECK PENDINGApr 7, 2013 · N594HA · Boeing 767332SDR CA130416009Valve · leaking(CAN) THERE WAS A REPORTED OIL ODOR AND MIST IN CABIN DURING DESCENT. THE ACFT LANDED NORMALLY AT DESTINATION. POST FLIGHT INSPECTION REVEALED OIL WAS COMING OUT FROM THE P2.2 VALVE PORT.Apr 2, 2013 · Bombdr DHC8400SDR CA130404006Oil System · leaking(CAN) IN CLIMB, THROUGH 15,000 FT CREW GOT NR 2 ENG OIL PRESSURE MASTER CAUTION ANNUNCIATOR. THEY OPERATED AT FLIGHT IDLE IAW QRH UNTIL OIL PRESSURE STARTED TO DECREASE BELOW 50 PSI. ENGINE RT WAS THEN SHUTDOWN IN FLIGHT. ENGINE LOST 9 QUARTS OF OIL. FOUNDApr 2, 2013 · Dhav DHC8315SDR UALA2013040202156Line · leakingNR 1 ENGINE LEAKING OIL, FLT DIVERTED. QTY DECREASING SINCE DEPARTURE. TIGHTENED SCAVENGE OIL LINE 14 TO 7 PER AMM. RAN ENGINE TO 1.25 EPR FOR 10 MINUTES. NO FURTHER LEAKAGE NOTED.Apr 1, 2013 · N493UA · Airbus A320232SDR ASAA2013040194319Transmitter · failedON TAXI IN OIL FILTER BYPASS LIGHT CAME ON NR 1 ENGINE FOLLOWED CHECKLIST AND SHUTDOWN ENGINE NO OTHER PROBLEMS. ACFT GROUNDED. REPLACED NR 1 SCAVENGE OIL FILTER IAW AMM 79-21-04-400-801-F00, NO CONTAMINATION NOTED. REPLACED SCAVENGE OIL FILTER CLOGGING TRAApr 1, 2013 · N413AS · Boeing 737990ERSDR NACA2013032700001Oil Filter · dirtyABORTED TAKEOFF DUE TO NR 1 ENGINE OIL FILTER BY-PASS LIGHT ILLUMINATING DURING TAKEOFF ROLL. REPLACED MAIN OIL FILTER. RAN ENGINE, NO LEAKS NOTED. P&WMM 72-61-00-430-00.Mar 27, 2013 · N320DL · Boeing 737232SDR UALA2013032902050Seal · leakingNR 2 ENG OIL CONSUMPTION CONTINUES TO INCREASE THE DEOILER ROTATING RING AND SEALS HAVE BEEN REPLACED. NOW CHECK FOR OIL LEAKS PER MM 79-00-95 PG 201 AND MM71-05-00 FIG 109. IF NO LEAKS FOUND ON VISUAL CHECKS RUN ENG AT 80% N1 FOR MINIMUM OF 10 MINUTES WITH Mar 26, 2013 · N551UA · Boeing 757222SDR UALA2013032601897Line · damagedTWO .375 INCH DIAMETER STAINLESS STEEL TUBING DAMAGED FROM CHAFING; HAS FLAT SPOT APPROX .750 INCH LONG BY.125 IN WIDE LOCATED APPROXIMATELY 6 INCH FWD OF MAIN OIL FILTER ON NR 1 ENG. REMOVED LINES. REPLACED DAMAGED LINES.Mar 25, 2013 · N655UA · Boeing 767322SDR O9IA2013032632213Housing · crackedAFTER SHUTDOWN, CREW IDENTIFIED OIL LEAKING FROM LT ENGINE NACELLE. INSPECTION REVEALED OIL FILTER ADAPTER HOUSING HAD 2 EARS CRACKED/BROKEN OFF. OIL FILTER ADAPTER HOUSING HAD SHIFTED ENOUGH THAT SEAL INTEGRITY BROKEN AND OIL WAS LEAKING PAST O-RING. R & RMar 22, 2013 · N95LF · Gulstm 690ASDR CA130416006Line · failed(CAN) THE PILOT REPORTED AN OIL PRESSURE DROP AND PERFORMED AN IFSD. THE ACFT GLIDED SAFELY TO THE GROUND. THE ON GROUND INVESTIGATION REVEALED OIL LOST DUE TO A BROKEN RGB OIL PRESSURE TRANSFER TUBE AT A FLANGE. THE ACFT SUFFERED MINOR AIRFRAME STRUCTURAL DAMar 21, 2013 · Cessna 208SDR WRNA201300006Seal · leakingDURING FLIGHT FROM CCS TO SCL PILOTS NOTICED NR 1 ENGINE HAD LOSS OF OIL PRESSURE AND OIL QUANTITY. CREW FOLLOWED SHUTDOWN PROCEDURES FOR NR 1 ENGINE. ON SHUTDOWN CREW NOTED THE FOLLOWING: OIL QTY: 1 QT., OIL TEMP: 156 DEG., OIL PRESSURE: 168. CREW RETURNEMar 21, 2013 · N952AR · Doug MD11FSDR QMLA2013032013041Magnetic Seal · wornDURING FLIGHT, NOTICED THE NR 1 ENGINE CHIP LIGHT. RESET THE MASTER CAUTION AND BURNED CHIP. CHIP LIGHT WENT OUT. NR 1 ENGINE CHIP CAUTION RETURNED. RESET MASTER CAUTION AND BURNED CHIP. CHIP LIGHT WENT OUT. RETURNED TO BASE. NR 1 ENGINE CHIP RETURNED Mar 20, 2013 · N877CR · Urocop EC135T2SDR CA130401013Engine · leaking(CAN) DURING FLIGHT, CREW REPORTED OIL ODOR IN CABIN AT VARIOUS POWER SETTINGS. THE FLIGHT CONTINUED TO THE DESTINATION NORMALLY. UPON LANDING, THE ACFT WAS DECLARED UNSERVICEABLE. TRACES OF OIL WERE FOUND DURING THE BORESCOPE INSPECTION THROUGH THE NL SENSORMar 19, 2013SDR CA130401003Oil System · leaking(CAN) THE CUSTOMER REPORTED THAT SMOKE AND THE ODOR OF OIL ENTERED THE CABIN DURING TAKE-OFF. THE ON GROUND INVESTIGATION REVEALED A LARGE QUANITY OF OIL IN THE NR 1 ENGINE CABIN BLEED PORT. MFG RECOMMENDED TO REPLACE THE ENGINE.Mar 18, 2013 · Propjt 200ASDR RAIA2013031800001Garlock Seal · wornCREW REPORTED RECEIVING AN ENGINE NR 1 LOW OIL PRESSURE MESSAGE ON THE EICAS DURING APPROACH AND SUBSEQUENTLY PERFORMED A COMMANDED SHUTDOWN OF THE NR 1 ENGINE. MAINTENANCE INSPECTED THE AIRCRAFT/ENGINE AND FOUND A LEAK AT THE NR 3 ENGINE GENERATOR AND THE ENMar 18, 2013 · N802HK · Emb EMB145EPSDR UALA2013031801603Breather Tube · leakingFLT CREW FOUND EVIDENCE OF OIL LEAK 2 ENGINE. REPLACED BREATHER TUBE THAT WAS CRACKED. RAN NR 2 ENGINE AT IDLE FOR 5 MIN, NO LEAKS.Mar 16, 2013 · N546UA · Boeing 757222SDR UALA2013031301483Bearing · leakingDUE TO EVIDENCE OF OIL IN NR 4 BEARING AIR SEAL, REPLACED NR 1 ENGINE PER AMM.Mar 10, 2013 · N206UA · Boeing 777222SDR UALA2013031301497Seal · leakingDUE TO EVIDENCE OF OIL IN NR 4 BEARING AIR SEAL, REPLACED NR 1 ENGINE PER AMM.Mar 10, 2013 · N206UA · Boeing 777222SDR USAA2013031100005Engine · overservicedCREW REPORTED A CHEMICAL ODOR IN CABIN WITH PACKS ON (AIRCRAFT PARKED AT GATE). SMOKE WAS ALSO PRESENT. MAINTENANCE ACCOMPLISHED JOB CARDS. FOUND NR 1 ENGINE OVERSERVICED. DRAINED 1 QUART OF OIL FROM NR 1 ENGINE. MAINTENANCE ALSO ACCOMPLISHED THE FOLLOWINMar 9, 2013 · N839AW · Airbus A319132SDR UALA2013030501323Seal · leakingCREW REPORT: ENGINE 2 LEAKING OIL ON WALK AROUND. REMOVED AND REPLACED DEOILER SEAL IAW MM, OPS CHECK GOOD.Mar 5, 2013 · N553UA · Boeing 757222SDR UALA2013030501306Line · chafedDURING VISUAL INSPECTION, FOUND CLAMP CHAFING INTO NR 4 BEARING SCAVENGE TUBE LR06. REPLACED OIL LINE. FOUR CLAMPS REMAIN TO BE ATTACHED TO 12TH STAGE BLEED DUCT. COMPLETED SECURING CLAMPS ATTACHING NR 4 BEARING SCAVENGE TUBE TO 12TH STAGE BLEED DUCT. ENMar 4, 2013 · N783UA · Boeing 777222SDR SIMA20130304006Carbon Seal · leakingFLIGHT 4486. CREW REPORTED AFTER TAKEOFF, NOTICED A STRONG ENGINE OIL ODOR IN THE COCKPIT THRU NR 1 PACK. NO ODOR WAS NOTICED IN CABIN. ODOR DISSIPATED IN CRUISE BUT CAME BACK TOP OF DESCENT, THRUST LEVER AT IDLE. ACFT REMOVED FROM SERVICE. NR 1 ENGINMar 4, 2013 · N734EK · Emb EMB135LRSDR ASAA2013030194060Scavenge Pump · making metalON INSPECTION ON FWD OIL SUMP SCAVENGE SCREEN FOR NR 2 ENGINE, FOUND SILVER FLAKING ON CHIP DETECTOR. ACFT GROUNDED. SILVER FLAKING FOUND NOT TO BE ASSOCIATED WITH MAGNETIC BEARING MATERIAL. ACFT IS OK FOR ENGINE OPERATION BUT CHIP DETECTOR INSPECTION INTERMar 1, 2013 · N533AS · Boeing 737890SDR UALA2013022701194Oil Filter · faultyNR 1 ENGINE OIL FILTER MESSAGE DISPLAYED. MESSAGE DISAPPEARED WHEN THRUST REDUCED. TROUBLESHOT IAW MM 79-35-00-101 FIG 103. REMOVED AND REPLACED MAIN OIL FILTER. INSPECTED ALL CHIP DETECTORS. NO CONTAMINENTS FOUND. REPLACED DIFFERENTIAL PRESSURE SWITCHFeb 26, 2013 · N667UA · Boeing 767322SDR VNAA2013022200011Carbon Seal · damagedCREW REPORTED LEFT ENGINE OIL PRESSURE CAS MESSAGE IN FLIGHT. LEFT ENGINE AT IDLE FOR REMAINDER OF FLIGHT AND OIL PRESSURE FLUCTUATING. CREW DECLARED EMERGENCY AND LANDED AT DESTINATION WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT LEFT ENGINE, REMOVED AND REPLFeb 22, 2013 · N218PS · Cndair CL6002B19SDR SIMA20130220010Carbon Seal · leakingFLIGHT 4103. CREW REPORTED THAT AFTER TAKEOFF, RECEIVED AN EICAS LAV SMOKE WARNING MESSAGE. DECLARED AN EMERGENCY AND COMPLETED AOM VOL 1 PROCEDURES AND RETURNED TO DEPARTURE. MESSAGE EXTINGUISHED ON APPROACH. LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FFeb 20, 2013 · N906AE · Emb EMB145LRSDR UALA2013020700757Oil System · leakingDURING ENGIINE SHUTDOWN, EXCESSIVE SMOKE FROM EXHAUST. INSPECTION REVEALED PUDDLE OF OIL IN LOWER TURBINE CASE. NR 2 ENGINE RUN PER JRH 2-40-6 HPT DRY-OUT PROCEDURE. ACCOMPLISHED TWO, TEN MINUTE IDLE RUNS, NO OIL PUDDLING OR SMOKE PRESENT AFTER IDLE RUNSFeb 6, 2013 · N853UA · Airbus A319131SDR USAA2013020500032Seal · deterioratedCREW REPORTED NR 1 ENGINE LOW OIL QUANTITY DROPPED TO ZERO FOLLOWED BY "OIL LO PR" ECAM MESSAGE. OIL PRESSURE INDICATED < 13 PSI ON ECAM ENG PAGE. THE NR 1 ENGINE WAS SHUT DOWN AND FLIGHT WAS DIVERTED TO CLT. MAINTENANCE REMOVED AND REPLACED NR 1 ENGINE ANDFeb 3, 2013 · N114UW · Airbus A320214SDR USAA2013020400023Oil System · overservicedCREW REPORTED ENGINE 1 OIL QUANTITY INDICATOR SHOWS XX. FLIGHT RETURNED TO FIELD AT PHX AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED CONNECTOR WIRING AND PINS. NO DEFECTS NOTED. FOUND ENGINE 1 OVERSERVICED WITH OIL. REMOVED 2 GALLONS OF OIL. REMOVEFeb 3, 2013 · N827AW · Airbus A319132SDR C8GA20130130002Pump · failedLEFT ENGINE OIL TEMP IN AMBER BAND (165 DEG) WITHOUT OIL QUANITY INDICATED. DURING CHECKLIST OIL TEMP INDICATION WENT TO (195 DEG) IN LESS THAN 1 MINUTE. SHUTDOWN ENGINE OIL TEMP AND QUANITY RETURNED TO NORMAL. R & R LEFT ENGINE LUBRICATION/SCAVENGE PUMP ANJan 30, 2013 · N531UA · Boeing 757222SDR CA130212007Limiter · leaking(CAN) THE PILOT REPORTED OIL MIST ON THE WINDSCREEN DURING APPROACH FOR LANDING. ON GROUND INVESTIGATION REVEALED THAT OIL WAS MIGRATING FROM THE ENGINE TORQUE LIMITER. THE PART WAS CHANGED. IAW SERVICE ENGINEERING REQUEST, THE TORQUE LIMITER WAS SENT TO THEJan 24, 2013 · Pilats PC1247ESDR ASAA2013012493754Oil Filter · failedON TAXI IN LT OIL FILTER BYPASS LIGHT ILLUMINATED FOR NR 1 ENGINE. ENGINE WAS SHUT DOWN IAW QRH. ACFT GROUNDED. ACCOMPLISHED FIM 79-05, TASK 817 & 79-21 TASK 806. FOUND FAULT CODE 79-31121, DUAL CHANNEL SIGNAL DISAGREE. REPLACED NR 1 ENG SCAVENGE OIL FILTEJan 24, 2013 · N408AS · Boeing 737990ERSDR CA130124025Garlock Seal · leaking(CAN) NR 2 ENGINE SHUTDOWN ON FINAL APPROACH DUE TO LOSS OF ENGINE OIL PRESSURE. FAULTY HYDRAULIC PUMP GARLOC SEAL REPLACED, CHECKED SERVICEABLE.Jan 23, 2013 · Dhav DHC7103SDR RYNA2013012100001Scavenge Pump · leakingNR 1 ENGINE OIL SCAVENGE PUMP LEAKING. REPLACED OIL SCAVENGE PUMP IAW AMM 79-21-00 P 401. OPERATIONAL AND LEAK CHECK NORMAL. INSPECTED MASTER CHIP DETECTOR PER AMM 79-21-10.Jan 21, 2013 · N637TW · Boeing 76733AERSDR SIMA20130121004Carbon Seal · leakingON FLIGHT 3290 THE CREW REPORTED THAT AFTER TAKEOFF APPROX 500 AGL THEY RECEIVED AN EICAS LAV SMOKE WARNING. THE CREW ACCOMPLISHED AOM VOL 1 PROCEDURES, DECLARED AN EMERGENCY WITH ATC AND RETUTNED TO DFW. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT Jan 21, 2013 · N831AE · Emb EMB135KLSDR IPXA13M76807Scavenge Pump · leakingNR2 ENGINE LOST OIL PRESSURE AND OIL QUANTITY. CREW SHUTDOWN THE ENGINE AND DECLARED EMERGENCY. OIL LEAK TRACED TO OIL SCAV PUMP, ENGINE CHANGED DUE WINDMILLING WITH "0" OIL PRESSURE IAW TC 9103.Jan 20, 2013 · N293UP · Doug MD11FSDR CHQA20130118021Scavenge Pump · leakingCREW REPORTED THAT DURING DESCENT THEY RECEIVED AN ENGINE 1 LOW OIL PRESSURE INDICATION. THE CREW FOLLOWED THE QUICK REFERENCE HANDBOOK AND SHUT DOWN THE ENGINE. THE CREW THEN DECLARED AN EMERGENCY. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE RJan 18, 2013 · N273SK · Emb EMB145LRSDR NACA20130116001Seal · failedMECHANICAL INTERUPTION,NR 1 ENGINE SHUTDOWN IN FLIGHT DUE TO LOSS OF OIL QUANTITY AND DECREASE IN OIL PRESSURE. WINDMILL TIME APPROX. 3-4 MINUTES WITH OIL PRESSURE AT 35 PSI AT SHUTDOWN. BORESCOPED ENGINE THROUGH LEFT IGNITOR HOLE BOSS OF LOCAL OIL LINE. NOJan 15, 2013 · N320DL · Boeing 737232SDR UALA2013011100195Packing · leakingRIGHT ENGINE IN FLIGHT SHUTDOWN, FLT DIVERTED. OIL LEAK AT EEC OIL TEMP THERMOCOUPLE PROBE, FOUND BAD PACKING. LEAK WAS ISOLATED TO OIL TEMP THERMOCOUPLE O-RING & WAS REPAIRED. NO OTHER LEAKS OBSERVED. REPLACED MAIN OIL FILTER AND CHECKED MAGNETIC CHIP DETECJan 10, 2013 · N546UA · Boeing 757222SDR DALA13004817105Oil System · lowACFT DIVERTED. FLIGHT CREW INITIATED THE SHUTDOWN OF THE NR 2 ENGINE ONCE OIL QUANTITY REACHED 3 TO 2 QUARTS INDICATED AND THE SHUTDOWN WAS ACCOMPLISHED WITH POSITIVE OIL PRESSURE AND NORMAL OIL TEMPERATURE. REPLACED NR 2 ENGINE.Jan 9, 2013 · N705DN · Boeing 777232SDR SWAA2013010911320Engine · leakingDIVERSION/INFLIGHT SHUTDOWN - SUSPECT OIL LEAK NR 1 ENGINE. OIL QTY 35% ON SHUTDOWN. NEVER LOST OIL PRESSURE. NO CAUTIONS OR WARNINGS. ALL INDICATIONS ON NR 1 ENGINE NORMAL THROUGHOUT THE FLIGHT AND THROUGH SHUTDOWN. REMOVED AND REPLACED NR 1 ENGINE PER TJan 8, 2013 · N723SW · Boeing 7377H4SDR 39LA201301150023Chip Detector · contaminatedAT CRUISE ALTITUDE, THE NR 1 ENGINE CHIP LIGHT ILLUMINATED. A RESET WAS ATTEMPTED WITH NO AFFECT. ACFT DIVERTED FOR MX. MX REMOVED THE CHIP DETECTOR AND CLEANED IT. AFTER REINSTALLATION NO LIGHTS WERE INDICATED DURING OR AFTER RUN UP.Jan 7, 2013 · N61NH · Skrsky S61NSDR CA130117005Oil System · leaking(CAN) DURING REVENUE FLIGHT, ON APPROACH, PILOT REPORTED OIL MIST AND ODOR IN CABIN, DECLARED AN EMERGENCY. A SINGLE ENGINE UNEVENTFUL LANDING WAS PERFORMED. ON GROUND INVESTIGATION, FOUND OIL STAINING AND DROPLETS ON PLENUM AND DIFFUSER. ENGINE TO BE REPLACJan 4, 2013 · Dhav DHC8102SDR CA130107008Engine · leaking(CAN) DURING THE APPROACH, FLIGHT CREW REPORTED SMOKE IN THE COCKPIT/CABIN AND DECLARED AN EMERGENCY. FLIGHT CREW PUT ON THEIR OXYGEN MASKS AND SMOKE GOGGLES, CONTINUED ON WITH THE APPROACH AND LANDED WITHOUT FURTHER INCIDENT. UPON LANDING THE ACFT WAS TAXIED Jan 4, 2013 · Dhav DHC8102SDR 2012FA0000839Chip Detector · contaminatedPILOT EXPERIENCE AN ENGINE CHIP LIGHT. PERFORMED AN UNSCEDULED LANDING. MX FOUND A 1MM SLIVER ON THE LOWER ENGINE CHIP DETECTOR. A 30 MINUTE GROUND PENALTY RUN WAS PERFORMED, THE PLUGS WERE CHECKED AND FOUND CLEAN. THE ACFT WAS RETURNED TO SERVICE.Dec 31, 2012 · N633JH · Hughes 369ESDR UIEA2012122900569Oil Filter · warning lightSTATUS MESSAGE " RT OIL FILTER" DISPLAYED. R & R RT ENGINE OIL FILTER ELEMENT IAW 79-21-04. PERFORMED ENGINE RUN, NO LEAKS NOTED, MESSAGE CLEARED.Dec 29, 2012 · N641GT · Boeing 76738ESDR ASMF201212014Packing · damagedAIR RETURN, DURING CLIMB, RT ENGINE LOW OIL QTY AND LOW OIL PRESS INDICATIONS. RT ENGINE SHUTDOWN AND ACCOMPLISHED QRH 7.21 PROCEDURE. REPLACED RT ENGINE CRACKING DRIVE COVER PACKING'S IAW MM 72-63-01 AND OPS TEST WAS PERFORMED IAW MM 79-00-00 AND DRY MOTORDec 27, 2012 · N997AM · Boeing 73776QSDR CA121221013Screen · split(CAN) ON INSPECTION OF OIL FILTER IT WAS FOUND THAT THE CENTER BYPASS SCREEN HAD SPLIT OPEN ON THE END WHERE IT WAS CRIMPED TOGETHOR ALLOWING FOR FULL OIL FLOW THROUGH THE FILTER CENTER. THE FILTER HAD NO CONTAMINATION AND NO ABNORMAL OIL PRESSURE INDICATIONS Dec 21, 2012 · Beech F90SDR UIEA2012121900555Line · leakingOIL QTY OF NR 4 ENGINE WENT TO ZERO. SHUTDOWN ENGINE IAW QRH. PERFORMED ENGINE INSPECTION IAW AMM 79-00-00/601. ACCOMPLISHED ENGINE WINDMILLING INSPECTION IAW AMM 72-00-00/601. DURING ENGINE INSPECTION, THE OIL PRESSURE TRANSMITTER WAS FOUND TO BE LEAKING. Dec 19, 2012 · N412MC · Boeing 74747UF
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