JASC 3230

Service difficulty reports · 11,175

Reports filed under 3230 · Landing Gear Retraction/Extension 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 = '3230'
  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 AALA202203298712Selector Valve · defectiveAIRCRAFT WAS GROUNDED: LAND GEAR DOORS NOT CLOSED ECAM AFTER GEAR EXTENSION ** ORIGINAL REPORT WAS AALA202203283700** REPLACED LANDING GEAR SAFETY VALVE 49GA PER AMM 32-31-17. REPLACED LANDING GEAR DOOR SELECTOR VALVE 41GA PER AMM 32-31-34 (AALA202203298902) RMar 26, 2022 · N770UW · Airbus A319112SDR QR9R20220325001Bracket · brokenDURING THRU-FLIGHT, IP NOTICED THE LOWER BRACKET ON THE LEFT CARGO DOOR HAD BROKEN OFF IN FLIGHT. REPLACED L/H SLIDING DOOR UPPER RAIL IAW AMM 53-31-01, 4-3.Mar 25, 2022 · Bolkms BK117C2SDR R61A2022032200211None · noneGEAR DID NOT RETRACT WHEN DEPARTING. DECLARED EMERGENCY ON RETURN, LANDED WITH OUT INCIDENT. R&R LH WORN 1 PROXIMITY SENSOR.Mar 19, 2022 · N824MD · Emb ERJ170100SUSDR R61A2022041800268Switch · faultyGEAR WOULD NOT RETRACT, DECLARED EMERGENCY, RETURNED TO FIELD, AND LANDED WITH OUT INCIDENT. CMC SHOWED #2 NOSE GEAR WOW SWITCH FAULTY. REMOVED & REPLACED #2 WOW SWITCH. IAW AMM 32-62-01. PERFORMED LANDING GEAR EXTENTION/RETRACTION TEST. IAW AMM 32-33-00.Mar 14, 2022 · N412YX · Emb ERJ170200LRSDR AALA202203165880None · noneAIRCRAFT WAS GROUNDED: LANDING GEAR SHOCK FAULT ECAM DISPLAYED AFTER TAKE OFF. LANDING GEAR WOULD NOT RETRACT. FLIGHT RETURNED TO ABQ LANDING SAFELY. **SUPPLEMENTAL REPORT WILL BE SUBMITTED.** (OPEN)Mar 14, 2022 · N161UW · Airbus A300*SDR AALA202203163917Pin · excess playAIRCRAFT WAS GROUNDED: ABORTED TAKEOFF AT 20 KNOTS DUE TO UNCOMMANDED NOSE WHEEL STEERING MOVEMENT TO THE RIGHT. TILLER THEN JAMMED HARD RIGHT. AIRCRAFT TOWED TO GATE. REPLACED STEERING METERING VALVE PER AMM 32-51-11 (AALA202203154847). REPLACED NOSE LANDING Mar 14, 2022 · N338PK · Boeing 737*SDR AALA202203165063Uplock · faultyAIRCRAFT WAS GROUNDED: UPON GEAR RETRACTION AFTER TAKEOFF, RECEIVED ECAM LANDING GEAR DOORS NOT CLOSED. SYSTEM WHEEL PAGE INDICATED IT WAS THE NOSE WHEEL DOOR. RETURNED TO DFW, LANDING SAFELY. **SUPPLEMENTAL REPORT FOR AALA202203145063: REPLACED NOSE LANDING GMar 13, 2022 · N112US · Airbus A320214SDR AALA202203145063None · noneAIRCRAFT WAS GROUNDED: UPON GEAR RETRACTION AFTER TAKEOFF, RECEIVED ECAM LANDING GEAR DOORS NOT CLOSED. SYSTEM WHEEL PAGE INDICATED IT WAS THE NOSE WHEEL DOOR. RETURNED TO DFW, LANDING SAFELY. **SUPPLEMENTAL REPORT WILL BE SUBMITTED.** (OPEN)Mar 13, 2022 · N112US · Airbus A320214SDR FDEA202203120491None · noneUNSAFE GEAR WARNING DURING EXTENSION FOR ALL 4 GEAR ON PRIMARY AND SECONDARY INDICATORS. AIRSPEED AT APPROXIMATELY 190 KNOTS. RETRACTED AND FOLLOWED QRH. RECEIVED NORMAL GEAR DOWN INDICATION AFTER THAT. CREW DEBREIF, CREW SUSPECTS GEAR HANDLE WAS POSMar 12, 2022 · N303FE · Doug MD1030FSDR VNAA202203141113Lever · unserviceableGEAR DISAGREE WARNING MESSAGE ON CLIMB OUT. ALL GEAR WERE DOWN WITH GEAR SELECTED UP. TROUBLESHOT GEAR DISAGREE IAW CRJ700 FIM 32-31-00-810-803-A01. PERFORMED OPS TEST OF LANDING GEAR EXTENSION/RETRACTION SYSTEM IAW CRJ700 AMM 32-30-00-710-801-A01. CYCLED GEMar 11, 2022 · N503AE · Cndair CL6002C10SDR VNAA202203141111None · noneSUPPLEMENTAL RECORD CORRECTIONMar 10, 2022 · N719PS · Cndair CL6002C10SDR YENA2022031100136Interface Unit · failedFLT#834 BOS-BOS. 'LGCIU 1+2 FAULT INFLIGHT - PERFORMED MANUAL GEAR EXTINSION; REMOVED AND REPLACED #1 LGCIU AS REQUIRED PER AMM 32-31-71 NO FURTHER DEFECTS NOTED AT THIS TIME BITE CHECK OK REF LP 3397526 FOR LGCIU CORRECTIVE ACTION'.Mar 9, 2022 · N520JB · Airbus A320232SDR R61A2022031100199Sensor · abnormalLANDING GEAR WOULD NOT COME UP AFTER TAKEOFF. DECLARED EMERGENCY, LANDED WITHOUT INCIDENT. COMPLIED WITH 170EI-32-60-0025. FOUND RH WOFW #1 SENSOR OUT OF TOLERANCE. ADJUSTED SENSOR IAW AMM 32-32-03 AND COMPLETED WIRING CHECKS IAW FIM 32-61-00-810-847-A. NO FAUMar 7, 2022 · N648RW · Emb ERJ170100SESDR DXTA2022030357790Switch · defectiveNLG LANDING GEAR EXTENSION: AFTER TAKEOFF, WHEN THE LANDING GEAR HANDLE WAS SELECTED UP, A VIOLENT SHAKING AND VIBRATION OCCURED. I IMMEDIATLY SELECTED THE LANDING GEAR DOWN WHICH GAVE US A POSITIVE 3 GREEN DOWN INDICATION AND THE SHAKING AND VIBRATION STOPPEDMar 3, 2022 · N668QS · Cessna 680ASDR MASA2022030300071None · noneGEAR DISAGREE WARN IN FLIGHT -EMER DECLARED. AIRCRAFT CURRENTLY OOS.Mar 3, 2022 · N905J · Cndair CL6002D24SDR DXTA2022022557380Squat Switch · defectiveNLG LANDING GEAR RETRACTION: UPON DEPARTING HCR LANDING GEAR WOULD NOT RETRACT. RAN APPROPRIATE QRH. MATCHED HANDLE TO INDICATION 3 GREEN. HAD ASSOCIATED WOW MISCOMPARE AMBER MESSAGE.//CORRECTIVE ACTIONS//REMOVED SUSPECTED FAULTY NOSE SQUAT SWITCH PN: 6948001-Feb 24, 2022 · N653QS · Cessna 680ASDR 2022FA0000117Cable Assy · looseN74825 DECLARED AN EMERGENCY FOR LANDING GEAR MALFUNCTION DURING APPROACH TO LAND AT 3J7, GREEN COUNTY AIRPORT, GREENSBORO GA. LANDING GEAR WOULD NOT EXTEND NORMALLY OR ALTERNATELY. AIRCRAFT DID A LOW APPROACH PAST TOWER TO VERIFY LANDING GEAR WERE NOT DOWN. AFeb 24, 2022 · N74825 · Piper PA31350SDR HXXC2022F00098None · noneNOSE GEAR WARNING LIGHT DID NOT ILLUMINATE WHEN EXTENDED. LIGHT CAME ON AT TOUCH DOWN. LUBED GEAR AND AJUSTED NOSE ACTUATOR. TEST GOOD. AMENDMENT TO 2022F00098 02/23/2022 ONLINEFeb 23, 2022 · N312AK · Piper PA31350SDR 2022F00098None · noneNOSE GEAR WARNING LIGHT DID NOT ILLUMINATE WHEN EXTENDED.Feb 23, 2022 · N312AK · Piper PA31350SDR VNAA202202231113Target · missingEMR DIV-GEAR DISAGREE AGREE WARNING MESSAGE ON TAKEOFF PERFORMED QRH CH 10-3, ALL THREE GEARS INDICATED DOWN AND LOCKED, LANDING GEAR DID NOT MOVE, NO CHANGE ON THE EITHER 3A OR 3B PUMP, VERIFIRED SYSTEM 3 HYDRAULICS AT 3000 PSI, MDC FLAGGING B1 CODE 007697, 0Feb 20, 2022 · N528EG · Cndair CL6002C10SDR CWQA20220222001Bulb · faultyDURING APPROACH AFTER GEAR SELECTED DOWN, RT MLG GREEN DOWN LIGHT DID NOT ILLUMINATE. CREW PERFORMED LIGHT TEST AND RT MLG GREEN DOWN LIGHTS DID NOT ILLUMINATE. AS A PRECAUTION CREW DID TOWER FLY BY FOR GEAR VERIFICATION AND ALSO PERFORMED MANUAL GEAR EXTEFeb 20, 2022 · N913CL · Cessna 560XLSDR 2022FA0000135Proximity Switch · failedTOOK OFF RWY 16R AND CALLED FOR GEAR UP. SIC PLACED GEAR LEVER IN UP POSITION, BUT GEAR DID NOT STOW. ALL GEAR INDICATIONS WERE RED. I ASKED HIM TO LET SOCAL KNOW WE ARE HAVING GEAR ISSUES. SOCAL CONTINUED US ON THE DEPARTURE. THE GEAR STOWED AFTER APPROXIFeb 19, 2022 · N909MM · Amd FALCON2000EXSDR IPXA2022021879151Lever · inoperativeINSPECTION TYPE:DOC, EMERG DECL'D, A/C LANDED UNEVENTFULLY. AFTER TAKEOFF GEAR WOULD NOT RETRACT. RESULTED IN AN EMERGENCY RETURN DUE TO INFLIGHT ICE. FOUND RIGHT GEAR PITCH DAMPNER AIR INDICATOR POPPED. R&R RH PITCH DAMPNER IAW 32-11-15-0401. ACCOMPLISHEFeb 18, 2022 · N171UP · Airbus A300F4622RSDR SWAA2022021472166None · noneLANDING GEAR LEVER WOULD NOT MOVE OUT OF THE OFF POSITION. COMPLIED WITH QRH. EXTENDED LANDING GEAR MANUALLY. ; / [01] PERFORMED SYSTEM TEST - LANDING GEAR CONTROL SYSTEM PER MM 32-31-00. OPS CHECKS GOOD; COULD NOT DUPLICATE WRITEUP AT THIS TIME.Feb 11, 2022 · N7863A · Boeing 737*SDR 2022FA0000087Uplock · malfunctionedLEFT MAIN LANDING GEAR UNLOCKED IN FLIGHT. PILOT FOLLOWED ABNORMAL PROCEDURES IN AFM AND SLOWED AIRCRAFT TO GEAR DOWN SPEED. EXTENDED GEAR AND LANDED AT SCHEDULED DESTINATION WITH NO OTHER ANOMALIES.Feb 10, 2022 · N485A · Amd FALCON10SDR R61A2022021100118Actuator · inoperativeLANDING GEAR DISAGREE, BRAKE CONTROL FAULT. DECLARED EMERGENCY, LANDED WITHOUT INCIDENT. R&R LANDING GEAR CONTROL LEVER AND RH MLG DOWNLOCK RELEASE ACTUATOR.Feb 7, 2022 · N237JQ · Emb ERJ170200LRSDR IPXA2022022779463None · noneINSPECTION TYPE:NAAFTER TAKEOFF GEAR LEVER WOULD NOT MOVE TO THE UP POSITION. NO EICAS MESSAGES COMPLIED WITH QRH. REPEAT WRITE UP FROM PREVIOUS FLIGHT.ONLY REPLACED NEW GEAR LEVER ACTUATOR MODULE ASSY PER AMM 32-31-01/401 P/N ON & OFF: 257U0002-34, S/N ON & OFeb 4, 2022 · N572UP · Boeing 74744AFSDR Q5QA20220127002Relay · failedPILOT REPORTED UPON SELECTING GEAR DOWN FOR A SCHEDULED LANDING THE GEAR ANNUNCIATOR LIGHT CAME ON AND THE GEAR FELL OUT OF THE GEAR WELL. THE PILOT PERFORMED AN EMERGENCY EXTENSION PROCEDURE AND THE GEAR LOCKED DOWN. HE THEN LANDED THE AIRCRAFT WITHOUT INCIDEFeb 2, 2022 · N149QD · Pilats PC1245SDR Q5QA20220201003Drag Link · brokenDURING A DESCENT, THE PILOT EXPERIENCED A LOUD BANG COMING FROM THE FRONT OF THE AIRCRAFT. AT THE SAME TIME, THE PILOT NOTED THE NOSE GEAR UNSAFE LIGHT. THE TOWER CONFIRMED DURING A LOW APPROACH AT KBNA THAT THE NOSE GEAR WAS ABOUT HALFWAY DOWN. THE PILOT PFeb 1, 2022 · N589Q · Pilats PC1245SDR IPXA2022020278577None · noneINSPECTION TYPE:NA**EMERGENCY DECLARED** **DIVERSION** **LANDING UNEVENTFUL** GEAR RETRACTION : GEAR LEVER WOULD NOT MOVE TO UP POS INFLT WAS FREE TO MOVE TO UP POS WHEN LOCK OVRD PUSHED .ACCOMPLISHED FIM 32-30-00-815-820 UP TO AND INCLUDING STEP #10 ALL AIRGRFeb 1, 2022 · N468UP · Boeing 75724APFSDR 2022F00093None · noneAIRCRAFT RETURNED OF FLIGHT DUE TO DURING CLIMB, THE RED LIGHT OF NOSE LANDING GEAR TURNED ON, WITH THE LANDING GEAR LEVER IN UP POSITION. MAINTENANCE PERSONNEL PERFORMED REVISION, DETECTING THE NLG LOCK PIN WAS FOUND INSTALLED; SO NLG LOCK PIN WAS REMOVED IAWJan 31, 2022 · N115AM · Boeing 7379SDR QXEA2022012800040Hydraulic Line · looseAFTER DEPARTURE LEFT GEAR DOOR INDICATED OPEN AFTER GEAR WAS RETRACTED. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED FROM SERVICE. AIRCRAFT DOWN FOR REPAIRS.Jan 28, 2022 · N403QX · Bombdr DHC8402SDR ANCF20220128007None · nonePILOT REPORT 27.JAN.2022 WO 54'303'634 => AFTER LIFT OFF WHEN SELECTING LG UP, L/G GEAR NOT UPLOCKED ECAM APPEARED. ON WHEEL SD PAGE, LG WAS CONFIRMED NOT UPLOCKED. AFTER RECYCLING LG LEVER ACCORDING TO ECAM, L/G DOORS NOT CLOSED. ECAM ALSO APPEARED. ACTIOJan 26, 2022 · N536AV · Airbus A320214SDR UIEA2022012300073None · noneGEAR DISAGREE EICAS AFTER SELECTING GEAR DOWN. RAN QRH PROCEDURES(<P>ON WALK AROUND FOUND TAIL SKID RETRACTED. PERFORMED FIM 32-30 FT 305. ON PSEU BITE TEST FOUND MSG '248' TAIL SKID RETRACT. PERFORMED TAIL SKID EXTEND OPS TEST PER AMM 32-71-00-715-001 OPS GOOJan 23, 2022 · N1997A · Boeing 76733ASDR IPXA2022011577877None · noneINSPECTION TYPE:N/ALANDING GEA DELAYED ITS RETRACTION GEAR DOORS OPENED GEAR STILL SHOWED DOWN& LOCKED. GEAR LEVER WAS VERIFIED IN UP DETENT. FIRST OFFICER TOUCHED GEAR LEVER RETRACTION INITIATED THEN NORMAL.REMOVED AND REPLACED LANDING GEAR NORMAL CONTROL MICJan 14, 2022 · N159UP · Airbus A300F4622RSDR 9WGA2022011254201Proximity Switch · dirtyDISCREPANCY: ON T/O LANDING GEAR WOULD NOT RETRACT, USED HANDLE RELEASE BUTTON - NOSE GEAR DID NOT RETRACT. CORRECTIVE ACTION: CLEANED AND ADJUSTED LANDING GEAR PROXIMITY SWITCHES IAW MD-11 AMM 32-01-15. LANDING GEAR OPS CHECK GOOD IAW MD-11 AMM 32-31-00. NO CJan 12, 2022 · N542KD · Doug MD11FSDR VNAA202201111111Selector Valve · false indicationAFTER TAKEOFF THE CREW GOT A GEAR DISAGREE MESSAGE AND RAN THE QRH & QRC. THE DECISION WAS MADE TO DIVERT TO BHM. ATC DECLARED A EMERGENCY FOR THE CREW. AS A PRECAUTION THE CREW DID HAVE EMERGENCY TRUCKS IN BHM ON STANDBY DURING LANDING BUT THEY WERE NOT NEEDEJan 7, 2022 · N594NN · Cndair CL6002D24SDR 2022F00067Landing Gear · mechanic errorTHE LIGHTS OF NOSE LANDING GEAR TURNED ON, AIRCRAFT RETURNED OF FLIGHT DUE TO DURING CLIMB, THE RED LIGHT OF NOSE LANDING GEAR TURNED ON, WITH THE LANDING GEAR LEVER IN UP POSITION. MAINTENANCE PERSONNEL PERFORMED REVISION, DETECTING THE NLG LOCK PIN WAS FOUNDJan 2, 2022 · N115AM · Boeing 7379SDR 2022F00066Landing Gear · mechanic errorTHE LIGHTS OF NOSE LANDING GEAR TURNED ON, AIRCRAFT RETURNED OF FLIGHT DUE TO DURING CLIMB, THE RED LIGHT OF NOSE LANDING GEAR TURNED ON, WITH THE LANDING GEAR LEVER IN UP POSITION. MAINTENANCE PERSONNEL PERFORMED REVISION, DETECTING THE NLG LOCK PIN WAS FOUNDJan 2, 2022 · N115AM · Boeing 7379SDR 5BMA12302102None · noneAFTER RETRACTING THE LANDING GEAR AFTER TO, THE GEAR KEPT TRYING TO COME UP AND DROPPING DOWN. WHEN THE GEAR WAS PUT BACK DOWN, THE MAINS CAME DOWN AND LOCKED AND SHORTLY AFTER THAT WE GOT A AMBER CAS MESSAGE THAT SAID WOW MISCOMPARE ALONG WITH A RED GEAR UNLODec 29, 2021 · N892CW · Cessna 680CESDR DXTA2021122954390None · brokenNLG LANDING GEAR EXTENSION: HAD AN UNSAFE NOSE GEAR INDICATION, RED UNLOCK LIGHT AND NO DOWN GREEN NOSE GEAR LIGHT. HAD 2 GREEN MAIN GEAR DOWN INDICATIONS. COMPLETED THE GEAR UNSAFE EMERGENCY PROCEDURE. THE NOSE GEAR WAS DOWN, LANDED UNEVENTFULLY.//SIGNOFF/Dec 28, 2021 · N357QS · Gulstm 680SDR LCPR20220119001None · defectiveAFTER INCIDENT ON 12/21/2021 AT KBCT. PER REQUEST AIRCRAFT WAS JACKED AND FUNCTIONAL CHECKS (GEAR SWINGS) WERE PERFORMED ON THE AIRCRAFT. AFTER MULTIPLE FUNCTIONAL CHECKS (GEAR SWINGS) IT WAS FOUND THAT THE NOSE GEAR WOULD NOT LOCK OUT AND A GRINDING NOISE WASDec 27, 2021 · N3134L · Cessna 310JSDR DXTA2021122754200None · noneNLG LANDING GEAR EXTENSION: WHEN THE LANDING GEAR WAS EXTENDED ON FINAL APPROACH THE NOSE GEAR DID NOT EXTEND. BOTH OF THE MAINS WERE GREEN, BUT THE NOSE WAS YELLOW WITH A RED LANDING GEAR SWITCH DISAGREE CAS MESSAGE. APPROXIMATELY ONE MINUTE LATER DURING Dec 26, 2021 · N428QS · Emb EMB505SDR 2021F00349Motor · noneTHE PILOT WAS COMPLETING A REVENUE FLIGHT FROM MHT TO RUT. HE STATED THAT WHEN APPROACHING RUT HE HAD 3 GREEN LIGHTS BUT THE HYDRAULIC PRESSURE DROPPED, THE LANDING GEAR BREAKER POPPED AND HE DIDN’T FEEL THE GEAR HAD FULLY EXTENDED. HE DID NOT DECLARE AN EMERDec 15, 2021 · N63978 · Beech C99SDR 2021F00348Motor · noneTHE PILOT WAS COMPLETING A REVENUE FLIGHT FROM MHT TO RUT. HE STATED THAT WHEN APPROACHING RUT HE HAD 3 GREEN LIGHTS BUT THE HYDRAULIC PRESSURE DROPPED, THE LANDING GEAR BREAKER POPPED AND HE DIDN’T FEEL THE GEAR HAD FULLY EXTENDED. HE DID NOT DECLARE AN EMERDec 15, 2021 · N63978 · Beech C99SDR DXTA2021121353470None · noneRIGHT MLG LANDING GEAR RETRACTION: AFTER TAKE OFF WHEN RETRACTING LANDING GEAR, 400' AGL AND 160KIAS, EXPERIENCED AMBER GEAR DISAGREE R AMBER CAS, AS WELL AS A MOMENTARY AMBER X IN RIGHT MAIN GEAR INDICATION WINDOW, AND LARGE AIRCRAFT VIBRATIONS SEEMINGLY CONIDec 12, 2021 · N684QS · Cessna 680ASDR GSPA202112160001Landing Gear · faultedEMPTY LEG MMSL TO KSDM IN ORDER TO CLEAR CUSTOMS. FLEW APPROACH INTO KSDM AT APPROXIMATELY1800L, LOST AIRPORT ENVIRONMENT WHILE CIRCLING, EXECUTED MISSED APPROACH, PROCEEDED TO OUR ALTERNATE KSAN. ON APPROACH INTO KSAN, UPON GEAR DOWN SELECTION, WE RECEIVED NODec 9, 2021 · N73WC · Beech B300SDR FDEA202112083047None · noneAFTER TAKEOFF AND RAISING GEAR HANDLE WE RECEIVED EICAS: GEAR DISAGREE & GEAR DOORS ALONG WITH GEAR AND DOORS LIGHTS. RETURNED TO IND AND GEAR EXTENDED NORMALLY. NO EMERGENCY DECLARED. CREW REPORTED LOUD NOISE WITH THE ALERTS ON. THEY SUSPECTED THDec 8, 2021 · N950FD · Boeing 757200SDR FDEA202112073026Actuator · leakingPDIS 528 32-30 9512 06DEC21 OAK OPEN U AT GEAR RETRACTION, LT MAIN REMAINED RED WITH OTHER GEAR LIGHTS OUT, CYCLED GEAR BACK DOWN AND GOT 4 GREEN LIGHTS. RETRACTED THE GEAR HANDLE UP AND ALL LIGHTS REMAINED RED AND NO LIGHTS OUT WITH GEAR HANDec 7, 2021 · N528FE · Doug MD11FSDR IPXA2021113076487None · noneINSPECTION TYPE:N/AGEAR DISAGREE EICAS AND GEAR DOORS EICAS MSGS SHOWS RIGHT GEAR STUCK IN DOWN POSITION.T/SHOOTED PER FIM32-30-00-815-820 BLOCK 4, FOUND HYD LEAK FROM DOWN PORT ON ACTUATOR. REPLACED R GEAR TRUCK POSITIONER ACTUATOR PER MM32-32-18-401 NO LEAK Nov 30, 2021 · N336UP · Boeing 76734AF
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