N8309C

Service difficulty reports · 193

Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. 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 n_number = 'N8309C' AND registry_match = 'registration'
  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 SWAA2023120815238Scuff Plate · crackedFWD CARGO BAY FWD CORNER SCUFF PLATE IS CRACKED<[01] VERIFIED MEASUREMENTS TABLE;[02] FWD CARGO BAY FWD CORNER SCUFF PLATE REPAIRED PER SRM 53-30-15-2R-1.<BR><BR>TASK CARD COMPLETED;[03] VERIFIED COMPLETION OF CORRECTIVE ACTIONS 2 AND MEASUREMENT TABLE.Oct 27, 2023 · N8309C · Boeing 7378H4 · Fuselage Miscellaneous StructureSDR SWAA2023120814747Bulkhead · crackedCRACKED LOWER L/H COMPOSITE BULKHEAD AT BS663 LBL34 WL158.<[01] CRACK AT THE LOWER LEFT-HAND COMPOSITE BULKHEAD BODY STATION 663; LBL 34; WL 158; WAS REPAIRED IAW SM 51-70-04-2R-10.;[02] ITEM 1 SHOULD READ: CRACK AT THE LOWER LEFT-HAND COMPOSITE BULKHEAD BODY Oct 25, 2023 · N8309C · Boeing 7378H4 · Fuselage Main, BulkheadSDR SWAA2023121113981Inlet · corrodedCORROSION ON L/H ENGINE UPPER BARREL SKIN AT 11:45 POSITION; 2' FROM L/E. (MARKED)<[01] COMPLETED LAST STEP; ALL STEPS ARE COMPLETE. REPAIRED #1 ENGINE INLET COWL UPPER BARREL SKIN AT 12:00 PER SRM 54-10-01-1A-1;[02] VERIFIED COMPLETE STEP 6; MEASUREMENTS TABLOct 24, 2023 · N8309C · Boeing 7378H4 · Engine Cowling SystemSDR SWAA2023120814426Battery Pack · inoperativeFWD L/H EMERGENCY OVERWING LT INOP<[01] EMERGENCY LIGHT BATTERIES WERE REPLACED ON CCN TTG8Q00P6HJ7 PERFORMED GOOD OPS CHECK OF <BR> OF THE FWD L/H EMERGENCY OVERWING LIGHT IAW AMM 33-51-00-710-801;[02] VERIFIED EMERGENCY LIGHT BATTERIES WERE REPLACED ON CCN TOct 24, 2023 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2023120814427Battery Pack · inoperativeSTRONGBACK EMERGENCY EXIT LIGHT AT SEAT ROW 13 CBA IS INOP<[01] EMERGENCY LIGHT BATTERIES WERE REPLACED ON CCN TTG8Q00P6HJ7 PERFORMED GOOD OPS CHECK OF <BR> OF THE STRONGBACK EMERGENCY EXIT LIGHT AT SEAT ROW 12 CBA IAW AMM 33-51-00-710-801;[02] UPDATED MEASUREOct 24, 2023 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2023120814428Battery Pack · inoperativeSTRONGBACK EMERGENCY EXIT LIGHT AT SEAT ROW 8 CBA IS INOP; STRONGBACK EMERGENCY EXIT LIGHT AT SEAT ROW 8 CBA IS INOP.<[01] EMERGENCY EXIT LIGHT BATTERIES WERE REPLACED ON CCN TTG8Q00P6HJ7 PERFORMED GOOD OPS CHECK OF THE STRONGBACK EMERGENCY EXIT LIGHT AT SEAT Oct 24, 2023 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2023050141387Flap · delaminatedLH WING OB AFT FLAP IB LOWER SURFACE DELAMINATED.<[01] REMOVED L/H OUTBOARD AFT FLAP;[02] INSTALLED REPLACEMENT LH OTB AFT FLAP REF MM 27-51-22Apr 26, 2023 · N8309C · Boeing 7378H4 · Trailing Edge FlapsSDR SWAA2023050141392Wire · looseCABIN RH AOE LOWER EMERGENCY EXIT LIGHT WIRES ARE NOT SECURE BEHIND PANEL.<[01] REMOVED ?RETURN AIR GRILLE? BELOW R/H AOE EMERGENCY EXIT; PULLED WIRES THROUGH AND SECURED; THEN REINSTALLED ?RETURN AIR GRILLE? PER AMM 21-23-03Apr 26, 2023 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2023042841376Girt Bar · out of adjustFWD ENTRY DOOR SLIDE GIRT REQUIRES ADJUSTMENT<[01] READJUSTED VELCRO ATTACHMENT ON GIRT BAR SWEEPER SLEEVE PER AMM 25-66-01 SEE MT 725-61-06 TTG8Q00CF7P4Apr 26, 2023 · N8309C · Boeing 7378H4 · Emergency EquipmentSDR SWAA2023021603723Door · crackedFOUND A CRACK ON LOWER PORTION OF ELECTRICAL GROUND POWER RECEPTACLE DOOR SURROUND<[01] UPDATE MEASUREMENTS;[02] PERFORMED HFEC INSPECTION OF DAMAGED AREA PER B737 NDT MANUAL 51-00-00 PROCEDURE 23. NO DEFECTS NOTED;[03] PERFORMED REPAIR TO LOWER PORTION OF ELEFeb 15, 2023 · N8309C · Boeing 7378H4 · Fuselage Main, StructureSDR SWAA2022082946710Charger · inoperativeBOTH LH OVERWING INTERIOR EXIT SIGNS INOP / [01] REPLACED EMER BATTERY CHARGER AND BATTERY PER AMM 33-51-06. OPS GOOD.Aug 27, 2022 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2022082947486Battery · inoperativeBOTH LH OVERWING INTERIOR EXIT SIGNS INOP / [01] REPLACED EMER BATTERY CHARGER AND BATTERY PER AMM 33-51-06. OPS GOOD.Aug 27, 2022 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2022051908406Bracket · brokenAFT SERVICE DOOR GIRT BAR BRACKET BROKEN / [01] GIRT BAR BRACKET ISN'T BROKEN; IT NEEDED ADJUSTMENT TO HOLD GIRT BAR TO MAKE SURE THAT THE BRACKETS OPERATE CORRECTLY PER MM 25-66-02 STEP 3.E.May 15, 2022 · N8309C · Boeing 7378H4 · Escape SlideSDR SWAA2022022275313Slide · lowR2 DOOR SLIDE PRESSURE LOW / [01] REMOVED AND REPLACED AFT SERVICE DOOR SLIDE PER AMM 25-66-01 AND <BR> MT725-61-06-AS REF MT FOR PART NUMBER AND SERIAL NUMBER ONFeb 18, 2022 · N8309C · Boeing 7378H4 · Escape SlideSDR SWAA2022011260087Light · faultyROW 14ABC EMER EXIT WINDOW SIDEWALL LT FLASHING ; / [01] OK TO CONTINUE PER MEL 33-2-04 SP1B. APPLIED TAPE OVER LT.; [02] REMOVED AND REPLACED EMER EXIT OVERWING LIGHT ASSY PER AMM 33-21-00-960-805. OPS CK GOOD. THIS CLEARS MDDR#43096. PLACARDS REMOVED.Jan 10, 2022 · N8309C · Boeing 7378H4 · Passenger Compartment LightingSDR SWAA2021120747143Battery Pack · inoperativeEMERGENCY EXIT LIGHT BATTERY PACK M1695 WILL NOT CHARGE ; / [01] REMOVED AND REPLACED EMERGENCY BATTERY PACK M1695 IAW AMM 33-51-06-960-805 TEST/OPS CHECK GOOD; [02] VERIFIED STEP 1; [03] AUDITEDNov 23, 2021 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2021120745917Skin · corrodedCORROSION ON EXTERIOR FUSELAGE SKIN AT STA 1016; 2 INCHES ABOVE TO 1 INCH BELOW STR 4L. DOT 203-004 ; / [01] REMOVED CORROSION AND CHECK WITH 10X MAGNIFYING GLASS IAW SRM 51-10-02-0G-0 ITEM 15;.; [17] REMOVED DAMAGE FROM FUSELAGE SKIN STA 1016 S-4L; FABRICATEDNov 19, 2021 · N8309C · Boeing 7378H4 · Fuselage Main, Plate/SkinSDR SWAA2021120744732Fairing · crackedA-061 DOT 014 LOWER FILLET FAIRING 191D CRACKED AT FASTENER HOLE ; / [01] EVALUATED AND FOUND FASTENER HOLE ON EDGEBAND AS MARKED DAMAGED ON UPPER SIDE. FOUND TO BE REPAIRABLE IAW SRM 53-30-70-2R-1 TABLE 202 AND SRM 51-70-04-2R-9.<BR><BR>CLEANED AND PREPPED IANov 17, 2021 · N8309C · Boeing 7378H4 · Aerodynamic FairingsSDR SWAA2021110540352Battery · inoperativeBOTH RT OUTSIDE AND INSIDE OVERWING AND CENTER CEILING LIGHTS INOP ; / [01] REMOVED AND REPLACED BATTERY PACKS AT M1676; M1671; AND BATTERY PACK AND CHARGER AT 1695 PER AMM 33-51-06. OPS CHECK GOOD.Nov 4, 2021 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2021110540872Charger · inoperativeBOTH RT OUTSIDE AND INSIDE OVERWING AND CENTER CEILING LIGHTS INOP ; / [01] REMOVED AND REPLACED BATTERY PACKS AT M1676; M1671; AND BATTERY PACK AND CHARGER AT 1695 PER AMM 33-51-06. OPS CHECK GOOD.Nov 4, 2021 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2021061882962Battery Pack · inoperativePASSENGER CABIN EMERGENCY LIGHTS AT OVERHEAD BINS 15BC 19 ABC 23ABC AND SIDEWALL LIGHT AFT OF OVERWING EMERGENCY EXIT DOOR ARE INOP / REPLACED EMERGENCY LIGHT BATTERY PACK PER AMM 33-51-06 OPS CHECK GOODJun 14, 2021 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2021012042823Battery Pack · inoperative3 EMERGENCY EXIT SIGNS IN FWD LT ENTRYWAY AND L1 EMERGENCY SLIDE LIGHT INOPERABLE. R & R FWD LT EMERGENCY BATTERY PACK M01675, IAW AMM 33-51-06. OPERATIONS CHECK GOOD.Jan 17, 2021 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2019120239255Battery · failedPASSENGER CABIN, FORWARD EMERGENCY FLASHLIGHTS FAILED INSPECTION CHECK ( LIGHTS DID NOT BLINK). / R&R FLASHLIGHT BATTERIES IAW AMM.Dec 1, 2019 · N8309C · Boeing 7378H4 · Emergency EquipmentSDR SWAA2019120239290Battery Pack · dischargedR1 DOOR EMERGENCY LIGHTS INOP. / R&R BATTERY PACK M2816 IAW AMM.Nov 30, 2019 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2019120239289Battery Pack · dischargedAFT RH EMERGENCY LIGHT BATTERY AT M1672 INOP. / R&R BATTERY PACK IAW AMM.Nov 29, 2019 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2019120239288Battery Pack · dischargedAFT L/H EMERGENCY LIGHT BATTERY AT M1673 INOP. / R&R BATTERY PACK IAW AMM.Nov 29, 2019 · N8309C · Boeing 7378H4 · Emergency LightingSDR SWAA2022032534365Cap · crackedAFT CARGO STA 727 CENTER FLOOR PLATE STIFFENER IS CRACKED. / RECEIVED AND VERIFIED NEW AFT CARGO FLOOR STA 727 CAP STRIP ASS AS P/N 453A2611-25 IAW AIPC 25-52-10-19 ITEM 55A TAG# WN1541Nov 28, 2019 · N8309C · Boeing 7378H4 · Fuselage Miscellaneous StructureSDR SWAA2022032534364Rib · cracked: LEFT HORIZONTAL STAB L/E CRACK ON FIFTH RIB IN FROM INB END. MARKED WITH BLACK MARKER / REMOVED FIFTH TAB FROM INB END OF LEFT HORIZONTAL STAB 4E CRACKED AND INSTALLED NEW RIB ASSY P/N 186A130S-1 (RUB CRACKED NOT FOUND ALLOWABLE LIMITS ON THE SRM) IAW B737-8Nov 26, 2019 · N8309C · Boeing 7378H4 · Horizontal Stabilizer, Spar/RibSDR SWAA2019120239253Rib · crackedL/H HORIZONTAL STABILIZER LEADING EDGE CRACKED ON FIFTH RIB IN FROM INBOARD END. / R&R RIB ASSEMBLY IAW SRM & DWG.Nov 26, 2019 · N8309C · Boeing 7378H4 · Horizontal Stabilizer, Spar/RibSDR SWAA2022032434356Scuff Plate · crackedAFT CARGO AFT CORNER SCUFF PLATE CRACKED / REMOVED CRACKED SCUFF PLATE; RE-WORKED SCUFF PLATE AS PER AAR BACKSHOP W/O 40218-1600-0001. RE-INSTALLED SCUFF PLATE AS PER B737 AMM 53-11-02-420-801Nov 22, 2019 · N8309C · Boeing 7378H4 · Fuselage Miscellaneous StructureSDR SWAA2022032434353Skin · delaminatedL/H WING # 4 SPOILER UPPER SURFACE DENT WAS FOUND TO BE DELAMINATED / EVALUATED REMOVED DAMAGE; CLEANED; PREPPED AND REPAIRED DENT DAMAGE/ DELAM ON L/H WING #4 SPOILER UPPER SURFACE IAW B737-800 SRM 57-53-01-2R-4; PAR 3 (A AND B); SRM 51-70-10-2R-2; PAR (4D ANNov 21, 2019 · N8309C · Boeing 7378H4 · SpoilersSDR SWAA2019112739186Skin · delaminatedL/H WING # 4 SPOILER UPPER SURFACE DENT WAS FOUND TO BE DELAMINATED. / REPAIRED #4 SPOILER IAW SRM.Nov 21, 2019 · N8309C · Boeing 7378H4 · SpoilersSDR SWAA2022032434342Floor Panel · debondedPASSENGER CABIN PANEL 221BF FWD I/B CORNER IS CRUSHED AND LOWER SURFACE PLIES DISBONDED AND TORN. / WORK ACCOMPLISHED ON NRC# ( 40216-1000 / 0038 )DEFECT# ( Y135836 )Nov 19, 2019 · N8309C · Boeing 7378H4 · Fuselage Floor PanelSDR SWAA2022032434331Floor Panel · brokenPASSENGER COMPARTMENT PANEL 221GF FWD O/B CORNER IS BROKEN. / REPAIRED FLOORBOARD 221GF O/B CORNER IAW SRM 53-00-50-2R-1; PG'S 1;2; STEPS 3(A-N0. A06130; A00515Nov 19, 2019 · N8309C · Boeing 7378H4 · Fuselage Floor PanelSDR SWAA2022032434323Web · cracked#1 ENGINE INBOARD FAN COWL VERTICAL WEB AFT OF OIL SERVICE DOOR IS CRACKED AT UPPER END / REMOVED WEB SHEILD AT #1 ENG I/B FAN COWL VERTICAL WEB AFT OF OIL SERVICE DOOR I.A.W SRM 51-40-02-0G-0. DRILLED NEW WEB SHIELD I.A.W SRM 51-40-05-0G-0 AND CMM 71-13-30. INov 18, 2019 · N8309C · Boeing 7378H4 · Nacelle/Pylon Miscellaneous StructureSDR SWAA2022032334301Attach Angle · crackedFWD CARGO COMPARTMENT STA 500I RBL 23 STRINGER CLIP IS CRACKED AS MARKED. / REMOVED STRINGER CLIP CRACKED AND INSTALLED NEW STRINGER CLIP P/N 143A1010-21 ON FWD CARGO COMPARTMENT STA 500I RBL 23' IAW B737-800 SRM 51-40-02-0G-0; SRM 51-40-05-0G-0; DWG # 143A101Nov 17, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, Longeron/StringerSDR SWAA2022032334296Attach Angle · crackedFWD CARGO COMPARTMENT STA 500I LBL 23 STRINGER CLIP IS CRACKED AS MARKED. / REMOVED CRACKED STRINGER STA 500I LBL 23 AND INSTALLED NEW STRINGER CLIP PART NO: 143A1010-47 ATG: A68459 IAW DWG: 143A123469A AND SRM 51-40-02-06-0. APPLIED CIC AS REQUIRED IAW AMM 51Nov 17, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, Longeron/StringerSDR SWAA2019112739185Stringer Clip · crackedFORWARD CARGO COMPARTMENT STRINGER CLIP CRACKED AT BS. 500I, LBL 23. / R&R STRINGER CLIP IAW SRM AND DWG.Nov 17, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, Attach FittingsSDR SWAA2019112539085Stringer Clip · crackedFORWARD CARGO COMPARTMENT STRINGER CLIP CRACKED AT BS. 500I, RBL 23. / R&R STRINGER CLIP IAW SRM & DWG.Nov 17, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, Attach FittingsSDR SWAA2022032334283Angle · corrodedAFT CARGO COMPARTMENT L/H 'Z' ANGLE FROM STA 727F TO 807; LBL 25; W/L 157 HAS MULTIPLE AREAS OF CORROSION / REMOVED CORROSION FROM L/H ZEE ANGLE STA 727F TO STA 807 IAW SRM 51-10-02-0G-0 PAR 15. EVALUATED MATERIAL LOSS ORIGINAL=.040' REMAINING=.034' LOSS=.007'Nov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, StructureSDR SWAA2022032334282Web · corroded: AFT CARGO COMPARTMENT R/H CUSP WEB BELOW THE 'Z' ANGLE FROM STA 747 TO 767; RBL 25; W/L 157 HAS MULTIPLE AREAS OF CORROSION / REMOVED AFT CARGO COMPARTMENT R/H CUSP WEB BELOW THE 'Z' ANGLE FROM STA 737 TO 767; RBL 25. W/L 157 IAW B737 SRM 51-40-02-0G-0. REMONov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, StructureSDR SWAA2022032334276Beam · corrodedPASSENGER CABIN STA 960-993 RBL 53 WL 208; CREASE BEAM INNER CHORD IS CORRODED. / REMOVED DAMAGE ON CREASE BEAM PASS. CABIN STA 960 - 993 RBL 53 WL 208. IAW B-737 SRM 51-10-02-0G-0. VERIFIED MAT LOSS. ORG. 'T' .080; REMAINING MAT. .065; MAT. LOSS .015'. FOUND Nov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, StructureSDR SWAA2022032334269Cap · corrodedFWD PIT; RH #2 CAP STRIP HAS CORROSION ON LOWER SURFACE. 21' FROM FWD END / REMOVED AND REPLACED; FWD PIT RH#2 CAP SSTRIP PN 453A1611-31 TO SI# 4251070 ATAG WN4395. IAW B-737 SRM 51-40-02-0G-0 AND IPC 25-52-10-03 ITEM 380. PART REPLACED DUE TO NO PUBLISHED SRMNov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Miscellaneous StructureSDR SWAA2022032334267Floor Panel · corrodedAFT CARGO COMPARTMENT PANEL 140AF HAS CORROSION AT THE EDGES AS MARKED. / THE ACCUMULATED CORROSION DAMAGE LENGTH IS MORE THAN 20' INCHES THEREFORE PANEL 140AF IS OUT OF LIMITS IAW SRM 53-00-53-1A-1 FIG 102. FABRICATED NEW PANEL 140AF IAW SRM 51-40-5-0G-0 AND Nov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Floor PanelSDR SWAA2022032334266Floor Panel · corrodedAFT CARGO COMPARTMENT PANEL 140CF HAS CORROSION AT THE EDGE AS MARKED. / LENGTH OF CORROSION (12') ON AFT CARGO COMPARTMENT PANEL 140CF EXCEEDS ALLOWABLE LIMITS AS PER B737 SRM 53-00-53-1A-1 FIG 102 SHT 1. REPLACEMENT PNL IS 453A2610-18 (WO3657) (SI) 7253212. Nov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Floor PanelSDR SWAA2022032334265Floor Panel · corrodedAFT CARGO COMPARTMENT PANEL 140DF HAS CORROSION AT THE EDGE AS MARKED. / EVALUATED CORROSION DAMAGE DAMAGE EXCEEDS 20' IN LENGTH FOUND TO BE OUT OF LIMITS RECEIVED AND VERIFIED NEW PANEL 140DF AS P/N 453A2610-20 IAW SRM 53-00-53-1A-1 FIG 102; AIPC 25-52-10-19 Nov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Floor PanelSDR SWAA2022032334264Scuff Plate · crackedFWD CARGO. FWD CORNER SCUFF PLATE IS CRACKED AT WELD AND UPPER AFT EDGE. (2EA PLACES) / REPAIRED FWD CORNER SCUFF PLATE OF FWD CARGO PIT I.A.W W/O # 40218-1400-0001 & REMOVED & INSTALLED I.A.W AMM 53-11-02-420-801.Nov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Miscellaneous StructureSDR SWAA2022032334263Floor Panel · corrodedFWD CARGO FLOOR PANEL 120AF HAS CORROSION AROUND PERIMETER OF PANEL. / FWD CARGO FLOOR PANEL FOUND TO BE OUT OF LIMITS AND REPLACED FLOOR PANEL 2024 T3 0.071' AND TESTED AND PRIMED PANEL IAW B737-800 SRM 51-40-05-0G-0; SRM 51-20-01-0G-0; AWG 3 453A1610 REV: 'FNov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Floor PanelSDR SWAA2022032334262Floor Panel · corrodedFWD CARGO FLOOR PANEL 120DF; UPPER SURFACE OF PANEL HAS CORROSION AROUND PERIMETER OF PANEL / REPLACED PANEL # 120 DF FWD CARGO FLOOR PANEL DF I/A/W 737 IPC 25-52-10-17 CORROSION REMOVAL AROUND PERIMEMTER OF PANEL WAS MORE THAN 20' IN LENGTH OUT OF LIMITS PER Nov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Floor PanelSDR SWAA2022032334259Web · corrodedFWD CARGO DOOR CUTOUT; LOWER DOOR SILL WEB HAS CORROSION ON UPPER SURFACE. STA 400 TO 480+4; RBL 21 TO RBL 26 / BLENDED CORROSION ON UPPER SURFACE OF FWD CARGO LOWER DOOR SILL WEB STA 480+4" RBL 21-26, ORIGINAL THICKNESS .045, REMAINING .027, LOSS OF .018 FOUNNov 16, 2019 · N8309C · Boeing 7378H4 · Fuselage Main, Structure
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