Boeing 737-990ER

Service difficulty reports · 10,299

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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 aircraft_model_key = '737990ER'
  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 ASAA2026101769361Access Door · looseGEAR DISAGREE AFTER T/O WITH GEAR HANDLE UP AND GEAR STILL DOWN. RAN QRH AND FOUND MAN GEAR EXTENSION ACCESS DOOR LOOSE/AJAR. GEAR RETRACTED AFTER MAN GEAR EXTENSION ACCESS DOOR WAS RESET. GROUNDED - YES. CHECKED AND VERIFIED NO DEFECTS TO MAN GEAR EXTENSION DOct 17, 2026 · N253AK · Boeing 737990ER · Landing Gear DoorsSDR ASAA2026101569329Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M2627 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY POWER PACK M2627 PER AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101569328Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M1671 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY POWER PACK M1671 PER AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101569327Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M1670 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY, POWER PACK M1670 PER AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101569326Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M1695 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY POWER PACK M1695 PER AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101569325Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M1676 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY POWER PACK M1676 PER AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101569324Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M2335 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY POWER PACK M2335 PER AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101569323Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M1675 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY POWER PACK M1675 PER B737-900 AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101569322Power Supply · inoperativeEMERGENCY LIGHT BATTERY PACK M1672 WILL NOT CHARGE. GROUNDED - YES. REMOVED, REPLACED AND PERFORMED INSTALLATION TEST OF EMERGENCY LIGHT BATTERY POWER PACK M1672 PER AMM 33-51-06-960-806, INSTALL TEST GOOD.Oct 15, 2026 · N288AK · Boeing 737990ER · Emergency LightingSDR ASAA2026101169225Door · no discrepancyL1 DOOR REQUIRES MORE FORCE THAN NORMAL TO OPEN AND CLOSE. GROUNDED - YES. ACCOMPLISHED FWD ENTRY DOOR CHECK, REF AMM 52-11-00, OPS CHECK GOOD CYCLED DOOR MULTIPLE TIMES USING BOTH INTERIOR AND EXTERNAL DOOR HANDLES FOR OPERATION, DOOR IS SECURED AND OPENS NOROct 11, 2026 · N428AS · Boeing 737990ER · Passenger/Crew DoorsSDR ASAA2026093069027Track · lack of lubeFA REPORTS L1 DOOR DIFFICULT TO OPEN & CLOSE. DOOR FEELS LIKE IT BINDS AT 50% OPEN/CLOSE. GROUNDED - YES. OPERATED THE L-1 DOOR MULTIPULE TIMES REF AMM52-11-00. NOTED GUIDE ARM TRACKS DRY. APPLIED GREASE TO GUIDE ARM TRACKS,HINGE ARM BUSHING UPPER, GUIDE ARM, Sep 30, 2026 · N461AS · Boeing 737990ER · Passenger/Crew DoorsSDR ASAA2026092968992Power Supply · inoperativeASILE EMERGENCY EXIT LIGHTS AT STA 727G+15 AND 756 R/H SIDE INOP. GROUNDED - YES. REPLACED THE M02627 POWER SUPPLY REF AMM 33-51-06-960-806.Sep 29, 2026 · N214AK · Boeing 737990ER · Emergency LightingSDR ASAA2026092869422Door Sill · corrodedFWD CARGO SILL WEB CORRODED. GROUNDED - YES. REMOVED CORROSION FOUND TO BE OUT OF LIMITS, REMOVED AND EPLACED FWD CARGO SILL WEB IAW B737-900 SRM 51-40-02-0G-0Sep 28, 2026 · N483AS · Boeing 737990ER · Fuselage Main, StructureSDR ASAA2026092869421Cargo Track · corrodedAFT CARGO, CARGO TRACK AT RBL-8 STA 727I+5 TRACK SPLICE CHANNEL CORRODED. GROUNDED - YES. REMOVED AND REPLACED CORRODED AFT CARGO, CARGO TRACK AT RBL-8 STA 727I+5 TRACK SPLICE CHANNEL IAW SRM 51-40-02-0G-0. W 1" O .080" R 0.0" L2" D .080".Sep 28, 2026 · N483AS · Boeing 737990ER · Fuselage, Seat/Cargo Attach FittingsSDR ASAA2026092869420Transition Panel · corrodedAFT CARGO RT TRANSITION FROM STA 727 TO STA 767 CORRODED. GROUNDED - YES. REMOVED CORROSION ON AFT CARGO RTH TRANSITION SIDEPLATE BS 727-767 FOND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2, REPAIRED TRANSITION IAW SRM 53-00-53-2R-5.Sep 28, 2026 · N483AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026092869419Web · corrodedAFT CARGO SILL WEB CORRODED. GROUNDED - YES. REMOVED CORROSION FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15-1A-1. REMOVED AND REPLACED CORRODED AFT CARGO SILL WEB IAW SRM 51-40-02-0G-0.Sep 28, 2026 · N483AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026092869268Shield · corrodedAFT CARGO FWD SHIELD CORRODED. GROUNDED - YES. REMOVED CORROSION, FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15-1A-1. REMOVED AND REPLACED SHIELD IAW SRM 51-40-02-0G-0.Sep 28, 2026 · N483AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026092868982Battery Pack · no testWHILE PERFORMING T/C 78233001 EMERGENCY BATTERY PACK CAPACITY FUNCTIONAL CHECK, M1673 AFT GALLEY LEFT OVHD BATTERY PACK FAILED. GROUNDED - YES. REMOVED AND REPLACED M1673 BATTERY PACK REF. AMM 33-51-06.OPS. CK. GOOD, OK FOR SVC.Sep 28, 2026 · N481AS · Boeing 737990ER · Emergency LightingSDR ASAA2026092369240Transition Panel · corrodedFWD CARGO RT TRANSITION PANEL BS 500A TO 500L CORRODED. GROUNDED - YES. REMOVED CORROSION FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-1, REMOVED AND REPLACED TRANSITION PANEL IAW SRM 53-00-53-2R-5.Sep 23, 2026 · N285AK · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026092368887Battery Pack · inoperativeWHILE WORKING T/C 78233001, M1673 FAILED TEST. GROUNDED - YES. REPLACED BATTERY PACK M1673 REF AMM 33-51-06-960-805. OPS CHECK GOOD.Sep 23, 2026 · N448AS · Boeing 737990ER · Emergency LightingSDR ASAA2026092068844Power Supply · inoperativeEMERGENCY LIGHTS AT ROW 9 DEF AND 13 DEF NOT ILLUMINATED. GROUNDED - YES. REMOVED AND INSTALLED SERVICEABLE EMERG LIGHTS POWER SUPPLY AND BATTERY PACK S/N 122749 ROW 7 DEF, OP CHECKS GOOD. IAW B737-900 AMM 33-51-06-960-805 STEP 4. E. 5, & 6.D AND 33-51-06-960-Sep 20, 2026 · N474AS · Boeing 737990ER · Emergency LightingSDR ASAA2026091568752Power Supply · faultyWHILE PERFORMING T/C 78233001, FOUND 2 FWD GALLEY, 2 AFT GALLEY, & 1 MIDDLE CABIN RT SIDE EMERGENCY LIGHT BATTERIES FAULTY. GROUNDED - YES. R & R 5 EMERGENCY LIGHT BATTERIES IAW AMM 33-51-06-960-805. OPS CHK FAILED AT AFT GALLEY RT EMERGENCY LIGHT STILL OFF. Sep 15, 2026 · N284AK · Boeing 737990ER · Emergency LightingSDR ASAA2026091268716Indication Sys · malfunctionedNOSE GEAR LOWERED WHEN GEAR HANDLE PLACED TO OFF, DURING AFTER TAKEOFF CHECKLIST. RED NOSE GEAR LIGHT/ GREEN NOSE GEAR LIGHT BOTH ILLUMINATED RAN QRH 14.4 GEAR DISAGREE, CONTINUED TO SEA AIRSPEED WAS 250 KIAS, ALTITUDE APPX 5000MSL. GROUNDED - YES. PERFORMED FSep 12, 2026 · N290AK · Boeing 737990ER · Nose/Tail Landing GearSDR ASAA2026091168670Converter · faultedDURING DEPT FLIGHT DECK ONLY HAD MILD OIL SMELL. WENT AWAY AT AROUND 5000'. AGAIN DESCENDING THROUGH APPROX 5000' STRONGER OIL SMELL IN FLIGHT DECK ONLY UNTIL ARRIVAL AT GATE. GROUNDED - YES. R & R LT OZONE CONVERTER REF AMM 21-73-01, R & R LT RECIRCULATION FASep 11, 2026 · N494AS · Boeing 737990ER · Air Conditioning SystemSDR ASAA2026090668658Power Supply · no testEMERGENCY LIGHT BATTERY PACK M1695 FAILS OPS CHECK. GROUNDED - YES. REMOVED AND REPLACED M1695 POWER SUPPLY S/N 156169 IAW AMM 33-51-06. OPS CHKD GOOD.Sep 6, 2026 · N283AK · Boeing 737990ER · Emergency LightingSDR ASAA2026090668657Power Supply · no testEMERGENCY LIGHT BATTERY PACK M2335 FAILS OPS CHECK. GROUNDED - YES. REMOVED AND REPLACED M2335 POWER SUPPLY S/N 156034 IAW B737NG AMM 33-51-06. OPS CHK GOOD.Sep 6, 2026 · N283AK · Boeing 737990ER · Emergency LightingSDR ASAA2026090668656Power Supply · no testEMERGENCY LIGHT BATERY PACK M1676 FAILS OPS CHECK. GROUNDED - YES. REMOVED AND REPLACED M1676 BATTERY PACK S/N 150209 IAW B737NG AMM 33-51-06. OPS CHKD GOOD.Sep 6, 2026 · N283AK · Boeing 737990ER · Emergency LightingSDR ASAA2026090668654Power Supply · no testEMERGENCY LIGHT BATTERY PACK M1670 FAILS OPS CHECK. GROUNDED - YES. REMOVED AND REPLACED M1670 POWER SUPPLY S/N 156230 IAW B737NG AMM 33-51-06. OPS CHK GOOD.Sep 6, 2026 · N283AK · Boeing 737990ER · Emergency LightingSDR ASAA2026090668653Power Supply · no testEMERGENCY LIGHT BATTERY PACK M2627 FAILS OPS CHECK. GROUNDED - YES. REMOVED AND REPLACED M2627 POWER SUPPLY S/N 156123 IAW B737NG AMM 33-51-06. OPS CHECK GOOD.Sep 6, 2026 · N283AK · Boeing 737990ER · Emergency LightingSDR ASAA2026090668651Power Supply · no testEMERGENCY LIGHT BATTERY PACK M1672 FAILS OPS CHECK. GROUNDED - YES. REMOVED AND REPLACED M1672 POWER SUPPLY S/N 155269 IAW B737NG AMM 33-51-06. OPS CHK GOOD.Sep 6, 2026 · N283AK · Boeing 737990ER · Emergency LightingSDR ASAA2026090668650Power Supply · failedEMERGENCY LIGHT BATTERY PACK M1671 FAILS OPS CHECK. GROUNDED - YES. REMOVED AND REPLACED M1671 POWER SUPPLY S/N 156362 IAW B737NG AMM 33-51-06. OPS CHK GOOD.Sep 6, 2026 · N283AK · Boeing 737990ER · Emergency LightingSDR ASAA2026090468556Door · out of adjustL1 DOOR IS HARD TO LATCH. GROUNDED - YES. MIG-2C INIT S/N:40-0080267,40-0080268,40-0080269, 40-0080270 ADJUSTED L1 DOOR INREF TO AMM 52-11-00-820-801 STEPS 2, CONTINUE ON ADJUSTING L1 DOOR IN REF TO AMM 52-11-00-8220-801 NO DEFECTS NOTED. MIG-2C SN 40-008267Sep 4, 2026 · N408AS · Boeing 737990ER · Passenger/Crew DoorsSDR ASAA2026082668309Door · lack of lubeFA REPORTS L1 DOOR IS DIFFICULT TO OPERATE. GROUNDED - YES. L1 DOOR SYSTEM TEST FOUND CLOSE TORQUE TO BE 600 IN-LB AND WITHIN LIMITS, OPEN TORQUE FOUND TO BE 445 IN-LB AND OUT OF UPPER LIMIT REF AMM 52-11-00. LUBRICATED L-1 DOOR COMPONENTS REF AMM 12-25-11-640Aug 26, 2026 · N453AS · Boeing 737990ER · Passenger/Crew DoorsSDR ASAA2026082368244Slide · unserviceableFA REPORTS RUBBER SEAL FALLING FROM L2 DOOR & HINDERING GIRT BAR. GROUNDED - YES. R&R L2 DOOR ESCAPE SLIDE WITH A SERVICEABLE UNIT REF AMM 25-66-01.Aug 23, 2026 · N440AS · Boeing 737990ER · Escape SlideSDR ASAA2026081868649Attach Angle · crackedCENTER WING REAR SPAR VAPOR WEB ATTACH ANGLE CRACKED. BS663 LBL13 ACCESS VIA 192CL. GROUNDED - YES. ACCOMPLISHED REAR SPAR VAPOR BARRIER ATTACH ANGLE REPAIR IAW B737-900ER SRM 57-10-10-2R-5 REPAIR 5.Aug 18, 2026 · N283AK · Boeing 737990ER · Fuselage Main, Attach FittingsSDR ASAA2026081868648Attach Angle · crackedCENTER WING REAR SPAR VAPOR WEB ATTACH ANGLE CRACKED. BS663 RBL 13 ACCESS VIA 192CR. GROUNDED - YES. ACCOMPLISHED REAR SPAR VAPOR BARRIER ATTACH ANGLE REPAIR IAW B737-900 SRM 57-10-10-2R-5 REPAIR 5.Aug 18, 2026 · N283AK · Boeing 737990ER · Fuselage Main, Attach FittingsSDR ASAA2026081668058Door · bindingFA SAYS THE L1 DOOR IS STICKY, HARD TO OPEN AND CLOSE. GROUNDED - YES. CHECKED L1 DOOR HANDLE TORQUE REF AMM 52-11-00, WELL W/IN LIMITS, HAD INCOMING FLIGHT CREW OPERATE DOOR MULTIPLE TIMES, NO PROBLEMS, NO HISTORY 30 DAYS.Aug 16, 2026 · N453AS · Boeing 737990ER · Passenger/Crew DoorsSDR ASAA2026081568666Support · corrodedUPON REMOVAL OF DAMAGED LAV MOUNT FITTINGS FOUND LAV SUPPORT LBL 20 STA 947 TO 967 CORRODED. GROUNDED - YES. REMOVED CORROSION & FOUND OUT OF LIMITS IAW BOEING 737-900ER SRM 53-70-51-1A-1. REMOVED & REPLACED LAV MOUNT SUPPORT INTERCOSTAL IAW BOEING 737-900ER SAug 15, 2026 · N474AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026081468793Floorbeam · corrodedUPON REMOVAL OF DAMAGED LAV MOUNT FITTINGS FOUND CORROSION ON BS 947 FLOORBEAM UPPER CAP AT ALL 4 LAV MOUNT FITTING LOCATIONS. GROUNDED - YES. REPAIRED FLOORBEAM 947.5 LBL-59-RBL-59 IAW SRM 53-70-51-2R-5 REPAIR 5, EA 900ER-53EA-30665.Aug 14, 2026 · N474AS · Boeing 737990ER · Fuselage Main, Floor BeamSDR ASAA2026081468792Sill Drain · corrodedR2 MOPSILL HAS MULTIPLE AREAS OF CORROSION. GROUNDED - YES. REMOVED & REPLACED R2 MOP SILL CHORD IAW BOEING SRM 51-40-02.Aug 14, 2026 · N474AS · Boeing 737990ER · Fuselage Main, StructureSDR ASAA2026081468665Mount · corrodedUPON REMOVAL OF DAMAGED LAV MOUNT FITTINGS FOUND LAV SUPPORT RBL 20 BETWEEN STA 947 AND 967 TO BE CORRODED WHERE MOUNT SITS. GROUNDED - YES. REMOVED CORROSION & FOUND OUT OF LIMITS IAW BOEING 737-900ER SRM 53-70-51-1A-1. REMOVED & REPLACED LAV MOUNT SUPPORT INAug 14, 2026 · N474AS · Boeing 737990ER · Fuselage, Equipment Attach FittingsSDR ASAA2026081468664Mount · corrodedUPON REMOVAL OF DAMAGED LAV MOUNT FITTINGS FOUND INTERCOSTAL RBL50 BETWEEN STA 927 AND 947 TO BE CORRODED WHERE MOUNT SITS. GROUNDED - YES. REMOVED CORROSION & FOUND OUT OF LIMITS IAW BOEING 737-900ER SRM 53-70-51-1A-1. REMOVED & REPLACED LAV MOUNT SUPPORT INTAug 14, 2026 · N474AS · Boeing 737990ER · Fuselage, Equipment Attach FittingsSDR ASAA2026081468663Mount · corrodedUPON REMOVAL OF DAMAGED LAV MOUNT FITTINGS FOUND LAV SUPPORT LBL 50 BETWEEN BS 947 & 967 TO BE CORRODED WHERE MOUNT ATTACHES. GROUNDED - YES. REMOVED CORROSION & FOUND OUT OF LIMITS IAW BOEING 737-900ER SRM 53-70-51-1A-1. REMOVED & REPLACED LAV MOUNT SUPPORT IAug 14, 2026 · N474AS · Boeing 737990ER · Fuselage, Equipment Attach FittingsSDR ASAA2026081468609Mount · corrodedUPON REMOVAL OF DAMAGED LAV MOUNT FITTINGS FOUND LAV SUPPORT RBL50 BETWEEN STA 947 AND 967 TO BE CORRODED WHERE MOUNT ATTACHES. GROUNDED - YES. REMOVED CORROSION & FOUND OUT OF LIMITS IAW BOEING 737-900ER SRM 53-70-51-1A-1 REMOVED & REPLACED LAV MOUNT SUPPORT Aug 14, 2026 · N474AS · Boeing 737990ER · Fuselage, Equipment Attach FittingsSDR ASAA2026081368735Attach Angle · corrodedAFT PIT FWD SHIELD ATTACH ANGLES 2 EA ARE CORRODED. GROUNDED - YES. REMOVED & REPLACED 2 EA AFT PIT FWD SHIELD ATTACH ANGLES IAW SRM 51-40-02-0G-0 STEP 4, 5, 7.Aug 13, 2026 · N474AS · Boeing 737990ER · Fuselage Main, Attach FittingsSDR ASAA2026080767895Tire · failedTIRES 1 AND 4 BLOWN ON LANDING. GROUNDED - YES. ANTISKID WAS ON MEL WHEN INCIDENT OCCURRED. DUE TO TIRE BLOWOUT, REQUIRES CONDITIONAL INSP. PERFORMED TIRE BURST COND INSP REF AMM 05-51-54. DUE TO MULTIPLE FLAT SPOT TIRES PERFORMED FLAT SPOTTED COND INSP IAW AAug 7, 2026 · N275AK · Boeing 737990ER · TireSDR ASAA2026080568790Transition Panel · corrodedAFT CARGO PIT RT TRANSITION HAS MULTIPLE SPOTS OF CORROSION AT BS 727-767. GROUNDED - YES. REMOVED DAMAGE, FOUND TO BE OUT OF LIMITS, REPAIRED RT TRANSITION FROM STA 727-767 IAW SRM 53-00-53-2R-5.Aug 5, 2026 · N474AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026080568736Transition Panel · corrodedFWD CARGO PIT LEFT TRANSITION AT STA 500 TO 500L HAS CORROSION. GROUNDED - YES. REPAIRED FWD CARGO PIT RT TRANSITION STA 500H+9 TO 500L IAW SRM 53-00-53-2R-5, REMOVED DAMAGE AT STA 500 TO 500H FOUND TO BE WITH IN LIMITS IAW SRM 53-00-53-1A-2.Aug 5, 2026 · N474AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026080568718Transition Panel · corrodedAFT CARGO BAY, LT TRANSITION HAS MULTIPLE SPOTS OF CORROSION AT BS 727 - 847. GROUNDED - YES. REMOVED CORROSION, FOUND OUT OF LIMITS, REPAIRED IAW SRM 53-00-53-2R-5 W= 1.5" O= 0040:. R= 0.032" L= 2" D= 0.008.Aug 5, 2026 · N474AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026080568607Baffle · crackedFWD CARGO PIT LT AT BS 500K FWD SIDE BAFFLE CLIP CRACKED. GROUNDED - YES. REMOVED AND INSTALLED NEW CILP ON FWD CARGO COMPT LH SIDE STA 500K IAW B737-900 SRM 51-40-02-0G-0.Aug 5, 2026 · N474AS · Boeing 737990ER · Fuselage Miscellaneous Structure
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