N428AS

Service difficulty reports · 250

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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 n_number = 'N428AS'
  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 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 ASAA2026022664788Shield · corrodedAFT PIT RH SIDE DOOR CUTOUT SHIELD PANEL HAS POSSIBLE CORROSION IN (5EA) SCREW HOLES AND UNDER NUTPLATES AT BETWEEN STA 787 TO 767 CIRCLES IN RED. GROUNDED - YES. REMOVED AND INSTALLED A NEW SHIELD PANEL AT AFT PIT R/H SIDE DOOR CUTOUT APROX STA 787 TO 767 IAWFeb 26, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026022564789Web · corrodedAFT CARGO DOOR CUTOUT, FORWARD LOWER CORNER ATTACH INTERCOSTAL CORRODED. BS788. GROUNDED - YES. REMOVED AND INSTALLED A NEW LOWER CORNER ATTACH INTERCOSTAL OF AFT CARGO DOOR CUTOUT BS788 IAW B737-900 SRM 51-40-01 AND B737-900 SRM 51-40-05 AND BAC DWG#146A8320 Feb 25, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026022465016Floorbeam · corrodedAFT WET AREA BS1016 RBL 30 FLOOR STRUCTURE CORRODED. A(K352). GROUNDED - YES. REMOVED CORROSION IAW SRM 53-70-51-1A-1. ORIG MAT .150, REMAINING MAT .070. MAT LOSS OF .080 IS BEYOND ALLOWABLE LIMITS. REPAIRED AREA IAW EA 900ER-53EA-30025 REV 00. THIS IS A CATEGFeb 24, 2026 · N428AS · Boeing 737990ER · Fuselage Main, Floor BeamSDR ASAA2026021964814Support Angle · corrodedLAV SUPPORT ANGLE AT STA 917 LBL54 HAS CORROSION. GROUNDED - YES. REMOVED CORROSION-ORIGINAL THICKNESS .150, REMOVED .110, REMAINING IS .040 AND REQUIRES REPLACEMENT DUE TO NO LIMITS GIVEN IN THE SRM. REMOVED AND REPLACED INTERCOSTAL P/N 147A5690U8 PO#1141724.Feb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026021964792Transition Panel · corrodedAFT CARGO LH TRANSITION PANEL HAS CORROSION BETWEEN STATIONS 727I TO FWD BULKHEAD. GROUNDED - YES. REMOVED CORROSION BETWEEN STA. 737I - FWD BULKHEAD. ORIGINAL THICKNESS .040 MAT LOSS AT GREATEST POINTS .007, AT LOWEST POINT REMAINING THICKNESS AT .033 AREAS OFeb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026021964791Transition Panel · corrodedAFT CARGO RH TRANSITION PANEL HAS CORROSION BETWEEN STATIONS 727I TO FWD BULKHEAD. GROUNDED - YES. REMOVED CORROSION BETWEEN 727I - FWD BULKHEAD. ORIG. THICKNESS .040, MAT LOSS AT GREATEST .008, NEW THICKNESS AT LOWEST .032. AREAS OUT OF LIMITS PER B737-900 SRFeb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Main, StructureSDR ASAA2026021964790Transition Panel · corrodedAFT CARGO RH TRANSITION PANEL HAS CORROSION BETWEEN STATIONS 727I - 767. GROUNDED - YES. REMOVED CORROSION BETWEEN STA 727I-767 ORIG THICKNESS .040, MAT LOSS AT GREATEST .010, NEW THICKNESS AT LOWEST .030. AREAS OUT OF LIMITS PER B737-900 SRM 53-00-53-1A-1 FABFeb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026021964787Web · corrodedAFT CARGO DOOR CUTOUT SILL AREA HAS A FEW SPOTS OF CORROSION. GROUNDED - YES. REMOVED CORROSION . ORIGNAL THICKNESS .045 PER B737-900 SRM 53-60-15. MAT LOSS .008 AT LOWEST, NEW THICKNESS .037 AT LOWEST. AREA OUT OF LIMITS. LOCATED, DRILLED AND INSTALLED P#146AFeb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026021964786Transition Panel · corrodedAFT CARGO LH TRANSITION PANEL HAS CORROSION BETWEEN STATIONS 727I-847. GROUNDED - YES. REMOVED CORROSION BETWEEN STA 727I-847, ORIG THICKNESS .040, MAT LOSS AT GREATEST .013, NEW THICKNESS AT LOWEST POINTS .027 MULTIPLE AREAS OUT OF LIMITS PER B737-900 SRM 53-Feb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026021964785Transition Panel · corrodedFWD CARGO LH TRANSITION PANEL HAS A PUNCTURE BETWEEN STA. 500-500A. GROUNDED - YES. REMOVED CORROSION ORIGINAL THICKNESS .040. MAT LOSS 100% AT PUNCTURE FABBED AND INSTALLED REPAIR PER B737-900 SRM 53-00-53-2R-5.Feb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2026021964784Web · corrodedRH WEB STA 987-1006 RBL 26-46 HAS AREAS OF CORROSION. GROUNDED - YES. REMOVED CORROSION IAW B737-900 SRM 51-10-02-0G-0. ORIGINAL THICKNESS .080 IAW BAC DWG #147A5116 REV- REMAINING THICKNESS IS .050 TOOL #T8224B DUE 03DEC26. .030 MAT LOSS. REMOVED AND REPLACEDFeb 19, 2026 · N428AS · Boeing 737990ER · Fuselage Miscellaneous StructureSDR ASAA2024092452818Apu · leakingDESCENDING THROUGH 11,000', ALL 3 IN THE COCKPIT SMELLED SAME METALLIC SMELL AS PREVIOUSLY REPORTED. APU WAS NOT RUNNING MORE OR LESS AT IDLE POWER FROM TOD TO BELOW WHEN SMELL WAS NOTIFIED. F/AS DID NOT REPORT NOTICING ANY UNUSUAL ODOR. GROUNDED - YES. DURINSep 24, 2024 · N428AS · Boeing 737990ER · APU Core EngineSDR ASAA2024090952402Circuit Breaker · openP6-11 A9 CABIN EMER LIGHT CB FOUND OPEN. GROUNDED - YES. RESET C/B - EMER LTS TEST GOOD.Sep 9, 2024 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2024082652106Power Supply · inoperativeDURING EMERGENCY BATTERY PACK TASK CARD FOUND BATTERY PACK M1672 TO BE BAD. GROUNDED - YES. REMOVED AND REPALCED BATTERY PACK M1672 PER AMM 33-51-06 OPS CHECK OF EMRGENCY PACK GOOD AT THIS TIME.Aug 26, 2024 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2024071551027Battery Pack · faultyM1670 EMERGENCY EXIT LIGHT BATTERY PACK & M2335 FOUND BAD AFFECTS L1507,L1210,L1506 AND L547,L6 AND L1515. GROUNDED - YES. REMOVED AND REPLACED M1670 AND M2335 EMERGENCY EXIT BATTERY PACK AND RESOLVED ALL AFFECTED LIGHTS OPS CHECK ALL NORMAL, REF AMM 33-51-06-Jul 15, 2024 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2024060650097Lens · detachedMISSING P/N 702409-1008 ROW 16ABC EMERGENCY EXIT SIGN REF IPC 11-32-00-51 ITEM 350. GROUNDED - YES. EMERGENCY EXIT SIGN LENS FOUND AT LAX . REPLACED LENS AT ROW 16ABC REF:AMM 33-51-01-960-801. OPS CK NORMAL, A/C OK FOR SERVICE .Jun 6, 2024 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2023102845901Unknown · unknownAPU NO ELECTRIC. GROUNDED - YES. ON DEFERRAL.Oct 28, 2023 · N428AS · Boeing 737990ER · Airborne Auxiliary Power Unit (APU) SystemSDR ASAA2023102445819Unknown · unknownCA SIDE RADAR SHOWS GROUND CLUTTER IN AUTO MODE. MANUAL MODE WORKS FINE. FO SIDE WORKS CORRECTLY IN AUTO OR MANUAL MODE. GROUNDED - YES. (RESOLVED ON W/O: 1974112 TASKCARD: N/R-00002 ) C/W WEATHER RADAR SYSTEM BITE AND OPS CHECK WITH NO FAULT NOTED. CLEARS MELOct 24, 2023 · N428AS · Boeing 737990ER · Weather Radar SystemSDR ASAA2023101745727Pump · leakingWHILE PERFORMING AN IDLE LEAK CHECK OF #1 ENGINE. LARGE AMOUNT OF FUEL DRAINED OUT OF FUEL PUMP DRAIN PAD. GROUNDED - YES. FUEL PUMP REMOVED PER T/C 8473002FUEL PUMP INST PER T/C 8473003 LEAK AND OPS CK GOOD.Oct 17, 2023 · N428AS · Boeing 737990ER · Engine Fuel PumpSDR ASAA2023092245248Unknown · unknownWHILE PERFORMING T/C 78273000 FOUND #1 ENG SHORT TIME FAULT 75-30451 THE VBV POSITION DISAGREE. GROUNDED - YES. (RESOLVED ON W/O: 1970329 TASKCARD: N/R-00003 ) FAULT NOT ACTIVE ON CURRENT FAULTS. FAULT HISTORY SHOWS ON LEG 8 ONLY. CLEAR PLT. SEAMC MITCH.Sep 22, 2023 · N428AS · Boeing 737990ER · Engine Bleed Air SystemSDR ASAA2023091845201Unknown · unknownFAULT LIGHT ILLUMINATED DURING APU START ATTEMPT AT FL340. SUCCESSFUL CSS ACCOMPLISHED AFTER FAULT LIGHT EXTINGUISHED. GROUNDED - YES. ON DEFERRAL.Sep 18, 2023 · N428AS · Boeing 737990ER · APU Start/Ignition SystemSDR ASAA2023090945008Eec · faultyWHILE PERFORMING T/C 78273000 FOUND #1 ENG SHORT TIME FAULTS 75-10451 AND 75-20451 THE VBV POSITION DISAGREE. GROUNDED - YES. (RESOLVED ON W/O: 1968547 TASKCARD: N/R-00002 ) INITIAL EVALUATION PERFORMED EEC BITE PROCEDURE REF FIM 73-00 TASK 801. BITE TEST REVSep 9, 2023 · N428AS · Boeing 737990ER · Fuel Controlling SystemSDR ASAA2023090545032Unknown · unknownREF LOG PAGE #60441010 APU FAULT LIGHT ILLUMINATED DURING CSS ATTEMPT. GROUNDED - YES. ON DEFERRAL.Sep 5, 2023 · N428AS · Boeing 737990ER · Airborne Auxiliary Power Unit (APU) SystemSDR ASAA2023090244895Unknown · unknownWHILE PERFORMING T/C 78273000 FOUND #1 ENGINE SHORT TIME FAULT MASG NBR 75-10451 THE VBV POSITION SIGNALS DISAGREE. GROUNDED - YES. (RESOLVED ON W/O: 1967781 TASKCARD: N/R-00003 ) PERFORMED EEC BITE TEST PROCEDURE AND ACTUATOR TEST PER FIM 75-32 TASK 803 NO FASep 2, 2023 · N428AS · Boeing 737990ER · Wing StructureSDR ASAA2023090145045Indicator · malfunctioned#2 REFUEL VALVE REQUIRES MANUAL OPERATION. GROUNDED - YES. (RESOLVED ON W/O: 1967254 TASKCARD: N/R-00002 ) TROUBLE SHOT PER WDM 28-44-11 AND SSM28-44-11 FOUND #2 REFUELING QTY INDICATOR BAD. REMOVED #2 REFUELING QTY IND PER AMM 28-41-61-000-801. INSTALLED #2 RSep 1, 2023 · N428AS · Boeing 737990ER · Fuel Quantity IndicatorSDR ASAA2023083044874Control Panel · faultyFAULT LIGHT ILLUMINATED DURING APU START ATTEMPT @ FL 350 SUCCESSFUL CSS ACCOMPLISHED DURING DESCENT, AFTER FAULT LIGHT EXTINGUISHED, @ FL 310. GROUNDED - YES. R&R OF APU FIREPANEL, GOOD APU START, NO FAULTS. PER SEAMC JEREMY OK TO CLEAR MEL 49-1B. PLACARDS REAug 30, 2023 · N428AS · Boeing 737990ER · Fire Protection SystemSDR ASAA2023082444763Battery · inoperativeTHE FOLLOWING EMER LIGHTS ARE INOP IN PASSENGER CABIN, R2 DOOR IN FRONT OF G4 GALLEY, LH OVERWING OVERDOOR FWD & AFT, PH BIN AT ROW 9DEF & 13 DEF, OH BIN AT ROW 16ABC, & OH BIN AT ROW 25DEF. GROUNDED - YES. REMOVED & INSTALLED SERVICABLE EMER LIGHT POWER SUPPLAug 24, 2023 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2023082144760Battery · inoperativeFWD CLOSEOUT PANEL EXIT LIGHT IS INOP. GROUNDED - YES. REMOVED AND INSTALLED SERVICEABLE EMERG. LIGHTS BATTERY PACK OPS CHECKS GOOD IAW B737-900 AMM 33-51-06-000-802, 25-21-71-000-820.Aug 21, 2023 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2023080544442Unknown · unknownLEFT FMC FAIL. GROUNDED - YES. PERFORMED FMC CB RESET PER FIM 34-61 TASK 836 OPS CHECK NML.Aug 5, 2023 · N428AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2023071944124Unknown · unknownWHILE ACCOMPLISHING TASK CARD # 78273000 FOUND SHORT TIME FAULT CODE # 75-30451 "THE VBV POSITION SIGNALS DISAGREE" ON ENG #1. GROUNDED - YES. (RESOLVED ON W/O: 1961389 TASKCARD: N/R-00003 ) DURING FLT FAULT CHECKED, NO FAULTS LOGGED IN HISTORY PAGE. ACCOMPLISJul 19, 2023 · N428AS · Boeing 737990ER · Engine Bleed Air SystemSDR ASAA2023071244016Unknown · unknownWHILE PERFORMING TC 78273000, FOUND MSG 73-11162 LONG TIME FAULT ON ENG #2. GROUNDED - YES. ON DEFERRAL.Jul 12, 2023 · N428AS · Boeing 737990ER · Fuel Controlling SystemSDR ASAA2023070943943Unknown · unknownWHILE PERFORMING T/C 78273000 FOUND LONGTIME FAULT ON #2 ENGINE MTX MSG 73-31162 THE MECHANICAL OVERSPEED PROTECTION SIGNAL IS OUT OF RANGE. GROUNDED - YES. ON DEFERRAL.Jul 9, 2023 · N428AS · Boeing 737990ER · Fuel Controlling SystemSDR ASAA2023062643739Battery Pack · inoperativeEMERGENCY AISLE LIGHT AT SEAT ROW 27 LEFT INOP. GROUNDED - YES. REMOVED AND REPLACED EMERGENCY LIGHT POWER SUPPLY M2626 REF AMM 33-51-06. OPS CHECK GOOD.Jun 26, 2023 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2023062343709Lamp · inoperativeR/H OVERWING AFT EMERGENCY LIGHT INOP. GROUNDED - YES. RELAMPED R/H AFT OVERWING EMERGENCY LIGHT, OPS CHECK GOOD REF AMM 33-51-04.Jun 23, 2023 · N428AS · Boeing 737990ER · Emergency LightingSDR ASAA2023061443687Unknown · unknownWHILE PREFORMING T/C 78273000. FOUND LONGTIME FAULT ON #2 ENGINE MTX MSG 73-21162 THE MECHANICAL OVERSPEED PROTECTION SIGNAL IS OUT OF RANGE. GROUNDED - YES. ON DEFERRAL.Jun 14, 2023 · N428AS · Boeing 737990ER · Fuel Controlling SystemSDR ASAA2023052743371Charger · inoperativeBATTERY DISCHARGE LIGHT ILLUMINATED. GROUNDED - YES. M5 BAT CHARGER STATUS LIGHTS OFF. CONFIRMED CORRECT VOLTAGE @ D42 PINS 10, 7, AND 4. P92 C809 CYCLE NO HELP. REMOVED AND REPLACED MAIN BATTERY CHARGER (M5) PER B737-900 AMM 24-31-21.May 27, 2023 · N428AS · Boeing 737990ER · Battery/Charger SystemSDR ASAA2023052643380Unknown · unknownFMC PROMPTS NOT AVAILABLE VTK ON CA SIDE. GROUNDED - YES. RESET 2 BREAKERS IAW B737-900 FIM 34-61 TASK 807.May 26, 2023 · N428AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2023042242964Unknown · unknownENG ANTI-ICE #2 COWL VALVE OPEN LIGHT (BLUE) STAYS ON WITH SWITCH OFF, WITH CORRESPONDING AMBER TAI ON THE ENGINE DISPLAY. GROUNDED - YES. OPERATED #2 ENG COWL ANTI-ICE VALVE MANUALLY & PERFORMED OPERATIONAL TEST IAW B737-900 AMM 30-21-00-710-801. OPS CHECK GOApr 22, 2023 · N428AS · Boeing 737990ER · Air Intake Anti/De-Ice SystemSDR ASAA2023040242742Exciter · failedENG #1 NO LIGHT OFF DURING START. GROUNDED - YES. REMOVED AND REPLACED #1 ENG L/H EXITER AND IGNITOR, AUDIBLE TEST FAILED REF AMM'S 74-11-01 + AMM 74-21-02, SUSPECT BAD HARNESS, REQUIRES FURTHER TROUBLESHOOTING. REMOVED & REPLACED #1 IGNITION LEAD IAW AMM 74-Apr 2, 2023 · N428AS · Boeing 737990ER · Ignition Power SupplySDR ASAA2023032542558Actuator · faultyAUTOPILOT A WILL NOT STAY ENGAGED. USED AUTOPILOT B. GROUNDED - YES. B737-900 FIM 22-11 TASK 856 PREVIOUS FLT LEG LOGGED FAULT MSG22-11189. FIM 22-12 TASK 813 DFCS AUTOPILOT TEST FAILED AND LOGGED MSG22-11134, MSG22-11122, MSG22-11125, MSG22-11126. AILERON RIGMar 25, 2023 · N428AS · Boeing 737990ER · Autopilot SystemSDR ASAA2023031342315Unknown · unknownAUTOPILOT A WILL NOT REMAIN ENGAGED. GROUNDED - YES. PERFORMED DFCS BITE REF B737-900 FIM 22-11 TASK 801. UNDER FAULT HISTORY LEG 1 CH. A FOUND ENGAGE ATTEMPT FAULTS AIL SYNC INV >4 SEC MSG 22-11189 AND AIL ACT PRESS LCL INV MSG 22-11147. REF FIM 22-13 TASK 80Mar 13, 2023 · N428AS · Boeing 737990ER · Autopilot SystemSDR ASAA2023031142303Unknown · unknownCOWL VALVE OPEN WHEN OFF DISAGREEMENT WITH THE SWITCH POSITION NOTICED ON ROLLOUT. GROUNDED - YES. IAW B737-900 FIM 30-21 TASK 804 PRSOV MANUAL OVERRIDE TO OPEN POSITION COWL VALVE OPEN LIGHT EXTINGUISHED. CYCLED ENGINE ANTI-ICE VALVE, COWL VALVE OPEN LIGHT OPMar 11, 2023 · N428AS · Boeing 737990ER · Ice/Rain Protection SystemSDR ASAA2023022242043Igniter · inoperative3 ATTEMPTS #1 ENGINE HUNG START, GOOD N1 AND N2 ROTATION, GOOD FUEL FLOW, NO IGN RISE. GROUNDED - YES. REMOVED AND REPLACED L IGNITER PLUG #1 ENG OPS CHECK GOOD. PER B737-900 AMM 74-21-02.Feb 22, 2023 · N428AS · Boeing 737990ER · Ignition Harness (Distribution)SDR ASAA2023021941996Unknown · unknownSINGLE L FMC FAIL. VTK AND AMBER "MAP" ON CA SIDE ND INFLIGHT. FMC BOTH ON RIGHT FOR SINGLE FMC OPS FOR REMAINDER OF FLIGHT. GROUNDED - YES. PERFORMED B737-900 FIM 34-61 TASK 801 FOUND MULTIPLE PGM FAULTS ON LAST LEG PERFORMED C/B RESET AND ALL DISPLAY FLAGS EFeb 19, 2023 · N428AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2023021642002Eec · faultyNO LIGHT OFF ON #1 ENGINE USING IGN R. GROUNDED - YES. REMOVED & REPLACED #1 ENG EEC, CLOSED 4 C/B, PERFORMED ALL INSTALLATION TESTS PASSED REF B737-900 AMM 73-21-60/401.Feb 16, 2023 · N428AS · Boeing 737990ER · Fuel Controlling SystemSDR ASAA2023021041929Spinner · damagedREF ASA T/C 78472000 ENG INLET & FAN DETAILED INSP FOUND #2 ENG S/N 854343 FRONT SPINNER CONE WHITE ANTI EROSION PAINT MISSING BY 50%. GROUNDED - YES. REMOVED & REPLACED #2 ENGINE SPINNER CONE REF B737-900 AMM 72-21-01.Feb 10, 2023 · N428AS · Boeing 737990ER · Turbine Engine Air Inlet SectionSDR ASAA2023020841889Actuator · faultyLEFT PACK LIGHT ILLUMINATED ON TAXI OUT, EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED RAM AIR INLET ACTUATOR REF B737-900 AMM 21-51-21.Feb 8, 2023 · N428AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2023020741867Unknown · unknownON SHUTDOWN LEFT "RAM DOOR FULL OPEN" LIGHT IS NOT ILLUMINATED ON POST FLIGHT WALK AROUND LEFT RAM DOOR IN CLOSED. GROUNDED - YES. PERFORMED LH PACK TEMP CONTROL BITE PER B737-900 FIM 21-62 TASK 801. FOUND FAULT 21-51405 SRADA INLET. PERFORMED FIM 21-62 TASK 8Feb 7, 2023 · N428AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2023013041739Unknown · unknownUNABLE TO SELECT F/D 1 AS MASTER OR ENGAGE CMD A IN FLIGHT.SEEMS TO OPERATE NOORMALLY ON GROUND.F/D 1 WAS SELECTED PRIOR TO TAKEOFF, BUT SWITCHED TO F/D 2 AS MASTER IN AIR. GROUNDED - YES. COULD NOT DUPLICATE MALFUNCTION.ADIRS, FCC'S, FMC'S & CDS LOGGED NO FAUJan 30, 2023 · N428AS · Boeing 737990ER · Autopilot System
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