N431AS

Service difficulty reports · 360

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 = 'N431AS' 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 ASAA2023031542417Actuator · leaking#2 ENGINE FUEL LEAK. GROUNDED - YES. FUEL LEAK FROM #2 ENGINE L/H VSV APPROX 50 DROPS PER MINUTE. REMOVED AND REPLACED #2 ENG LEFT VSV ACTUATOR REF B737-900 AMM 75-31-01.Mar 15, 2023 · N431AS · Boeing 737990ER · Compressor Bleed ControlSDR ASAA2023030742243Power Supply · failedEMERGENCY LIGHT SYSTEM OPERATIONAL TEST FAILED FOR ALL LIGHTS ASSOCIATED WITH BATTERY PACK M2335.TIPR833K. GROUNDED - YES. REMOVED AND REPLACED M2335 EMERGENCY POWER SUPPLY IAW B737-900 AMM 33-51-06, OPS CHECK GOOD.Mar 7, 2023 · N431AS · Boeing 737990ER · Emergency LightingSDR ASAA2023022342153Skin · puncturedLEFT ELEVATOR, LOWER SURFACE PUNCTURED AT APPROX. ELEVATOR STATION 176.64 AND 13" INCHES FWD FROM TRAILING EDGE.(AREA MARKED IN RED) TIRP833K. GROUNDED - YES. REPAIRED LEFT ELEVATOR LOWER SURFACE PUNCTURE IN NOTED AREA IAW B737-900 SRM 55-20-01-2R-1, 51-70-04-Feb 23, 2023 · N431AS · Boeing 737990ER · Elevator StructureSDR ASAA2023010641477Pressure Switch · faulty#2 ENG FUEL FILTER BYPASS LIGHT. GROUNDED - YES. REMOVED AND REPLACED FUEL FILTER DIFFERENTIAL PRESSURE SWITCH REF B737-900 AMM 73-34-01.Jan 6, 2023 · N431AS · Boeing 737990ER · Fuel Pressure SensorSDR ASAA2023010341385Apu · overtempAPU REPORTS SHOWS CT5ATP TEMP IS STILL AT/BEYOND THE 605 DEGREE THRESHOLD. GROUNDED - YES. REMOVED AND REPLACED APU REF B737-900 AMM 49-11-00/401. OPS AND LEAK CHECK GOOD.Jan 3, 2023 · N431AS · Boeing 737990ER · APU Core EngineSDR ASAA2023010241394Wire Harness · failedREF ASA L/P 60410136 J-10 HARNESS FAILS INSULATION RESISTANCE CHECK OF B737-900 AMM 77-21-01/501. ON #1 ENGINE. GROUNDED - YES. REPLACED ENG #1 J10 ENGINE HARNESS REF B737-900 AMM 73-21-06. EEC BITE GOOD. J10 OPS CHECK PASSES REF AMM 73-21-06.Jan 2, 2023 · N431AS · Boeing 737990ER · Engine Fuel System WiringSDR ASAA2023010241391Probe · faulted#1 EGT WENT TO 911* IN THE YELLOW BAND AT 34000 FEET JUST BEFORE TOP OF DESCENT. ON DESCENT THRU 25000 FEET. THE EGT NORMALISED WITH THE #2 ENGINE AFTER WE REDUCED THE THRUST ON THE #1 ENGINE. THROUGHOUT DESCENT #1 EGT RAN ABOUT 30* TO 100* HOTTER THAN #2 ENGIJan 2, 2023 · N431AS · Boeing 737990ER · Engine EGT/TIT Indicating SystemSDR ASAA2023010241390Wire Harness · shorted#1 ENGINE CJ-10 HARNESS IS SHORTED INTERNALLY. GROUNDED - YES. REPLACED #1 ENGINE HARNESS REF B737-900 AMM 73-21-06-000-803.Jan 2, 2023 · N431AS · Boeing 737990ER · Engine Fuel System WiringSDR ASAA2022121641167Fuel Nozzle · faultedAPU TREND DATA SHOWS CT5ATP TEMP IS AT OR ABOVE THE THRESHOLD 605 DEGREES. GROUNDED - YES. REMOVED AND REPLACED FUEL NOZZLES REF B737-900 AMM 49-31-14.Dec 16, 2022 · N431AS · Boeing 737990ER · APU Engine Fuel and ControlSDR ASAA2022120941093Circuit Breaker · openLEFT FWD WINDOW OVERHEAT LIGHT CAME ON CLIMBOUT. GROUNDED - YES. PERFORMED WINDOW HEAT CONTROL UNIT BITE PER B737-900 FIM 30-41 TASK 801 FOUND BUS POWER LIGHT ON. ACCOMPLISHED FIM 30-41 TASK 806 FOUND C/B P6-11 B9 OPEN. CLOSED C/B PER B737-900 AMM 20-60-01-860Dec 9, 2022 · N431AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2022120841064Wire Harness · faultedDIAGNOSTICS SHOWS #1 ENGINE VIBRATION DATA POINTS ARE ERRATIC. INDICATION SYSTEM ERRORS ARE SUSPECTED. GROUNDED - YES. COMPLETED ASA TSR713472 STEPS 1-4. REMOVED AND REPLACED MW0311 WIRE HARNESS. REF B737-900 AMM 73-21-06/401. REMOVED AND REPLACED FFCC VIBRATIDec 8, 2022 · N431AS · Boeing 737990ER · Engine Indicating System WiringSDR ASAA2022092940120Autothrottle Sys · failedAUTO THROTTLES STOPPED WORKING AND WOULD NOT RE-ENGAGE. GROUNDED - YES. A/T INFLT FAULTS SHOWED NO A/T FAULTS LAST 22 LEGS. LEG 23 HAD ASM 2 RATE MONITOR FAULT. PERFORMED B737-900 FIM 22-32 TASK 819, INITIAL EVALUATION TEST GOOD. SERVO MOTOR TEST PERFORMED NUSep 29, 2022 · N431AS · Boeing 737990ER · Auto Throttle SystemSDR ASAA2022092440047Contact · out of adjust#2 HF/SAT XFER HF LIGHT NOT ILLUMINATING. GROUNDED - YES. CLEANED CONTACTS ON #2 HF/SAT TXFER SW & LITE ASSY AND ADJUSTED CONTACTS. RETENTION AND INDICATION / ILLUMINATION #2 HF/SAT SW NML.Sep 24, 2022 · N431AS · Boeing 737990ER · HF Communications SystemSDR ASAA2022090839881Battery Pack · inoperativeEMERGENCY LIGHTS AT ROWS 10DEF AND 13DEF WILL NOT COME ON, THEY FLASH THEN GO RIGHT BACK TO OFF WHEN SWITCH ACTIVATED. GROUNDED - YES. REPLACED M1676'S BATTERY PACK IAW B737-900 AMM 33-51-06-960-805, OPS CHECK GOOD.Sep 8, 2022 · N431AS · Boeing 737990ER · Emergency LightingSDR ASAA2022082439637Power Supply · inoperativeDURING A-CK FOUND EMERGENCY LIGHT ABOVE R2 DOOR INOP. GROUNDED - YES. REMOVED AND REPLACED POWER SUPPLY REF B737-900 AMM 33-51-06.Aug 24, 2022 · N431AS · Boeing 737990ER · Emergency LightingSDR ASAA2022070338955Autothrottle Sys · failedAUTOTHROTTLES WOULD NOT ENGAGED ON DEPARTURE AND REMAINDER OF FLIGHT. GROUNDED - YES. A/T INFLT FAULTS SHOWED ON ONLY "FLT 11" OUT OF 40 LOGGED FLTS WITH A ASM 2 RATE MONITOR FAULT. PERFORMED B737-900 FIM 22-32 TASK 819 INITIAL EVALUATION TEST GOOD - SERVO MOTJul 3, 2022 · N431AS · Boeing 737990ER · Auto Throttle SystemSDR ASAA2022060338577Egt Indication · false indication#1 ENG EGT BOX RED FOUND ON PRE-FLIGHT. GROUNDED - YES. PERFORMED B737-900 FIM 71-06 TASK 805 F. VERIFIED EEC BITE TEST ON #1 ENG ESN 658-273 GOOD NO FAULTS VERIFIED, NO FAULTS MSG LOGGED. THIS CLEARS PLT.Jun 3, 2022 · N431AS · Boeing 737990ER · Engine Temperature Indicating SystemSDR ASAA2022052338425Servo · leakingWHILE ACCOMPLISHING LEAK CHECK PER ASA T/C 78424000 THE #1 ENGINE FUEL SERVO HEATER WAS LEAKING FUEL. GROUNDED - YES. REMOVED AND REPLACED #1 ENG FUEL SERVO HEATER. OPS CHECK GOOD. IAW B737-900 AMM 73-11-07.May 23, 2022 · N431AS · Boeing 737990ER · Engine Fuel DistributionSDR ASAA2022051338304Battery Pack · dischargedDURING ACCOMPLISHMENT OF T/C 78233001 2 AISLE EMERGENCY LIGHTS FAILED TIME TEST. GROUNDED - YES. REPLACED BATTERY PACK AT LOCATION M2627 S/N 304744 PER B737-900 AMM 33-51-06-960-805. OPS IS GOOD.May 13, 2022 · N431AS · Boeing 737990ER · Emergency LightingSDR ASAA2022032437793Fmc · failedLEFT FMC FAIL IN CRUISE, FMC RESET AFTER 2 MINUTES AND WORKED PROPERLY AFTER RESET. GROUNDED - YES. TROUBLESHOT & FOUND FMCS-L FAULTED MULTIPLE LEG WITH "ETHERNET-2", REPLACED NEW FMCS-L & PERFORMED INSTALLATION TESTS GOOD. B737-900 AMM 34-61-02/401 & FIM 34-6Mar 24, 2022 · N431AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2022030737657Actuator · faultyRIGHT RAM DOOR FULL OPEN BLUE LIGHT REMAINED ILLUMINATED AFTER FLAP RETRACTION IN CLIMB AT CRUISE FL350. GROUNDED - YES. REMOVED & REPLACED R/H INLET ACTUATOR B737-900 AMM 21-51-21. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE AMM 21-61-01 GRD VERIFICATION SUCCMar 7, 2022 · N431AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2022012337267Unknown · unknownWHILE PERFORMING T/C # 78273000 FOUND SHORT TIME FAULT MSG NBR: 73-20011 INTERNAL EEC FAULT ON # 1 ENGINE. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 73-21 TASK 801 FOR #1 ENGINE EEC. REINSTALLED EEC SOFTWARE PER B737-900 AMM 73-21-60-470-801-F00. ALL TEST PASSJan 23, 2022 · N431AS · Boeing 737990ER · Fuel Controlling SystemSDR ASAA2021121036862Unknown · unknownZONE TEMP ILLUMINATED ON RECALL MASTER CAUTION CONTROL CABIN ZONE TEMP. GROUNDED - YES. C/W FIM PROCEDURES. INITIAL EVALUATION, BITE TEST AND NOTED FLT DECK TRIM VALVE RED LIGHT ILLUMINATED. DURING BITE TEST RESET PROCEDURE GREEN GO LIGHT ON AFTER VERIFY TEST Dec 10, 2021 · N431AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2021111436616Unknown · unknownFMC'S BLANKED ON LANDING THEY RESTORED ON THEIR OWN. GROUNDED - YES. R/H FMC HAD A PGM FAULT & REBOOTED BOTH. OPS CK OK REF B737-900 FIM 34-61 TSK 807 REBOOTED BOTH ON IT'S OWN. NO GND FAULTS. PRECAUTIONARY - CYCLED PWR TO R/H & L/H FMC FOR A RE-SYNC. BITE TESNov 14, 2021 · N431AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2021110736544Modulating Valve · faultyZONE TEMP LIGHT CONT CAB ILLUMINATES DURING MASTER CAUTION RECALL RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED CONT CAB TRIM MODULATING VALVE REF B737-900 AMM 21-61-21. OPS CHECK GOOD.Nov 7, 2021 · N431AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2021101636350Actuator · leakingDURING PDC WALK AROUND FOUND #2 ENG LEAKING FUEL. FOUND RIGHT VSV LEAKING FUEL 15 DROPS A MINUTE. PERFORMED #2 ENGINE IDLE POWER RUN FOR 5 MINUTES. NO LEAK FOUND AFTER ENGINE RUN. COMPONENT TO BE REPLACED WITHIN 25 FLIGHT CYCLES REF B737-900 AMM 71-71-00-200-Oct 16, 2021 · N431AS · Boeing 737990ER · Compressor Bleed ControlSDR ASAA2021100836221Unknown · unknownFLT DECK TEMP CONTROL ZONE TEMP LIGHT ILLUMINATES ON MASTER CAUTION RECALL. EXTINGUISHES WITH M.C. RESET. GROUNDED - YES. VERIFIED CONTROL CABIN ZONE TEMP ILLUMINATES ON RECALL. PERFORMED PZTC BITE, PZTC #2 FAULTED CONTROL CABIN TRIM VALVE ON BIT AND PREV FLIGOct 8, 2021 · N431AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2021090735885Inlet · gougedREF T/C # 78472000 #2 ENG INLET AND FAN BLADES DETAILED INSPECT, FOUND DUCT FOR TAI VALVE O/O MOUNT LOBES GOUGED FROM ROD END OF TURN BUCKLE. GROUNDED - YES. REMOVED AND REPLACED #2 ENG TAI VALVE DUCT REF CFM5-7 PPBUM 71-00-02. LEAK CHECK GOOD. NO OTHER DEFECTSep 7, 2021 · N431AS · Boeing 737990ER · Turbine Engine Air Inlet SectionSDR ASAA2021072335504Brake · faultedAFTER BLOCK IN WHEN #2 START LEVER MOVED TO CUTOFF ENG FAIL APPEARED ON THE #2 EGT UNTIL ENG WOUND DOWN THEN EXTINGUISHED. GROUNDED - YES. ACCOMP #2 EEC BITE RECENT FAULTS SHOWS LONG TIME FAULT MSSG 76-11362 ON FLIGHT ZERO ACCOMP EEC TEST TEST PASS REF B737-90Jul 23, 2021 · N431AS · Boeing 737990ER · Engine StarterSDR ASAA2021071435377Unknown · unknownAUTOTHROTTLE WILL NOT STAY ENGAGED. GROUNDED - YES. ACCOMPLISHED AUTOTHROTTLE BITE PER B737-900 FIM 22-31 TASK 801, CURRENT STATUS, HAS NO FAULTS. IN-FLIGHT FAULTS SHOWS ASM-2 MSG 22-31688 NUMEROUS TIMES ON LEG 4 ONLY. ACCOMPLISHED FIM 22-32-TASK 819 INITIAL EJul 14, 2021 · N431AS · Boeing 737990ER · Auto Throttle SystemSDR ASAA2021070535261Tube · brokenLEFT BLEED AIR DUCT PRESSURE INDICATES 9PSI ON THE GROUND WITH ENGINE POWER AT IDLE, A/C PACKS IN AUTO, AND ENGINE ANTI-ICE OFF. RIGHT BLEED AIR DUCT PRESSURE INDICATES NORMAL APROX 20PSI. GROUNDED - YES. PERFORMED INSPECTION OF BLEED AIR SYSTEM OF #1 ENGINE, Jul 5, 2021 · N431AS · Boeing 737990ER · Pneumatic Distribution SystemSDR ASAA2021070335243Fmc · failedAFTER LANDING CAPT'S AND F/O'S FMC'S FAILED. REMAINED OFF LINE FOR:25-45 SECONDS. GROUNDED - YES. PERFORMED B737-900 FIM 34-61 TASK 801 AND FOUND PGM FAULT IN LEFT AND RIGHT FMC. PERFORMED FIM 34-61 TASK 807 AND BOTH FMCS OPS TEST GOOD.Jul 3, 2021 · N431AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2021070335241Fmc · faultedDURING LATERAL OFFSET TO AVOID WEATHER, FIRST OFFICER'S MAP DISPLAY VTK AND SCRATCHPAD INDICATED SINGLE FMC OPERATION. FOLLOWED QRC AND RELOAD DUAL FMC OPERATION. GROUNDED - YES. PERFORMED B737-900 FIM 34-61 TASK 836 RESET C/B 6D16 AND 18A6. SYSTEM OPS CHECK OJul 3, 2021 · N431AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2021060735058Pedestal · abnormalPWS FAIL MESSAGE MOMENTARY ILLUMINATION ON APPROACH FROM 1000' TO TOUCH-DOWN SELM CLEARED INFO ONLY WRITE UP. GROUNDED - YES. FOUND WXR BLOWER BEARINGS FAILING. REMOVED AND REPLACED BLOWER REF B737-900 AMM 34-53-51 OP CK GOOD. WXR RADAR OP CK GOOD PER AMM 34-4Jun 7, 2021 · N431AS · Boeing 737990ER · Weather Radar SystemSDR ASAA2021060735050Drive Unit · faultedWXR FAIL ON BOTH ND. GROUNDED - YES. DIVERSION TIME 90 MINUTES - PER TSR710872 REMOVED AND PRECAUTIONARILY REPLACED ANTENNA DRIVE UNIT IAW B737-900AMM 34-43-11. PERFORMED OPS CK OF WEATHER ANTENNA DRIVE UNIT IAW AMM 34-43-00-710-802-001. NO DEFECTS NOTED.Jun 7, 2021 · N431AS · Boeing 737990ER · Weather Radar SystemSDR ASAA2021060435038Transceiver · failedWXR FAIL SHOWS ON ND. GROUNDED - YES. REMOVED & REPLACED WXR RADAR RT AND INSTALL TEST NORMAL, OPENED & CLOSED 2 C/B B737-900 AMM 34-43-41/401, CONFIRMED PART EFFECTIVELY WITH AOG ENGINEERING, CLEARS MEL 34-15D, PLACARD REMOVED, SEAMC JAKE NOTIFIED..Jun 4, 2021 · N431AS · Boeing 737990ER · Weather Radar SystemSDR ASAA2021052934969Transceiver · not seatedIN CRUISE AT FL350 WITH WEATHER RADAR ON IN AUTO WX + T MODE, AMBER WXR FAIL ILLUMINATED ON ND. IN TEST MODE, PWS FAIL AND WXR FAIL ANT ARE DISPLAYED ON N.D. GROUNDED - YES. RESEATED WEATHER RADAR TRANSCEIVER AND ACCOMPLISHED BIT CHECK IAW B737-900 FIM 34-45 TMay 29, 2021 · N431AS · Boeing 737990ER · Weather Radar SystemSDR ASAA2021052334874Data Unit · malfunctionedTAKEOFF DATA NOT LOADING CORRECTLY. GROUNDED - YES. PITOT PROBE HEAT ON, TURNED OFF. CYCLED FMC COMPUTERS OFF/ON. FMCS BITE NORMAL PER B737-900 FIM TASK 34-61-00-810-801. T/O DATA LOADED.May 23, 2021 · N431AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2021052034860Warning Message · false activationFWD WND LEFT OVERHEAT. GROUNDED - YES. FOUND WINDOW HEAT POWER LEFT FRONT ON P6-11 PANEL OUT. ACCOMPLISHED C/B RESET REF B737-900 AMM 20-60-01 WINDOW HEAT CONTROL SYSTEM TEST PASS REF AMM 30-41-11 NO HISTORY PAST 90DAYS, SEAMC STEVE ADVISED.May 20, 2021 · N431AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2021051934861Transceiver · faulted"WXR FAIL" MESSAGE DISPLAYED. "PWS FAIL, WXP FAIL ANT" DISPLAYED WHEN IN RADAR TEST MODE. GROUNDED - YES. RESET WX TRANSCEIVER. REF B737-900 AMM 20-60-99. ACCOML BITE CHECK OF WX RADAR SYSTEM. REF 737-900 FIM 34-43-801. NO DEFECTS NOTED. DEFECTS CLEARED. SEAMCMay 19, 2021 · N431AS · Boeing 737990ER · Weather Radar SystemSDR ASAA2021042334666Warning Light · false indicationCONT CAB ZONE TEMP LIGHT ILLUMINATED ON RECALL. GROUNDED - YES. PERFORMED ZONE TEMP LIGHTS COME ON DURING MASTER CAUTION RECALL FAULT ISOLATION PROCEDURE AND BITE PROCEDURE FOR LH & RH PACK TEMPERATURE CONTROLLERS FLT DECK TRIM VLVE FAULT LIGHT CLEARED & CONT Apr 23, 2021 · N431AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2021041934620Blade · erodedWHILE ACCOMPLISHING MTC 78472010, FOUND NR 2 ENG FAN BLADE NR 13 WITH MISSING CU-NI-IM COATING. MISSING BEYOND ALLOWABLE LIMITS. 27MM ON THE CONCAVE SIDE CONTACT AREA. GROUNDED - YES. REPLACED NR 13 FAN BLADE ON NR 2 ENG. AND ITS PAIR NR 1 PER T/C 78472010.Apr 19, 2021 · N431AS · Boeing 737990ER · Turbine Engine Air Inlet SectionSDR ASAA2021040834533Heat Exchanger · leakingREF LOG PAGE 60093274 DURING REMOVAL AND REPLACEMENT OF FUEL OIL HEAT EXCHANGER FOUND SERVO FUEL HEATER LEAKING ON #2 ENGINE. GROUNDED - YES. REMOVED AND REPLACED SERVO FUEL HEATER PER B737-900 AMM 73-11-07-400-801-F00 AND IDLE POWER LEAK CHECK GOOD PER AMM 71Apr 8, 2021 · N431AS · Boeing 737990ER · Engine Fuel/Oil CoolerSDR ASAA2021040334502Valve · leakingDURING ENG RUN REF L/P 60093274, FOUND HPTACC VALVE DRAIN DRIPPING. GROUNDED - YES. FOUND DRAIN LEAKING 4 DRM REF B737-900 AMM 71-21-00-200-801-F00 FIM 605. REMOVED AND REPLACED #2 ENG HPTACC VALVE IAW AMM 75-21-01, OPS CHECK GOOD, LEAK CHECK GOOD. NO FURTHER Apr 3, 2021 · N431AS · Boeing 737990ER · Engine Cooling SystemSDR ASAA2021040334498Heat Exchanger · leakingFOUND FUEL DRIP ON #2 ENG FUEL OIL HEAT EXCHANGER DRAW LINE. GROUNDED - YES. REMOVED AND REPLACED FUEL OIL HEAT EXCHANGER REF B737-900 AMM 79-21-02 PERFORMED ENGINE RUN FOUND SERVO FUEL HEATER LEAKING REF L/P 60093288 FOR REMOVE AND REPLACEMENT.Apr 3, 2021 · N431AS · Boeing 737990ER · Engine Fuel/Oil CoolerSDR ASAA2021032834488Connector · brokenFCC BITE INHIBITED WHEN FMS-2 DATA SELECTED. REF B737-900 WDM 34-61-14, WIRES W0523-2769 B&R 24 NOT INSTALLED IN FMC-2 CONNECTOR D3261A PINS G9& H9. E5-2 RACK REMOVED FOR ACCESS. GROUNDED - YES. REF B737-900 WDM 34-61-14 PAGE 7A WIRE W0523-2769-24 NOT PRESENTMar 28, 2021 · N431AS · Boeing 737990 · Flight Management Computing Hardware SystemSDR ASAA2021032834487Computer · faultyNEITHER LNAV OR VNAV WOULD ENGAGE. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 22-11 TASKS 830 AND 831 ALSO FIM 34-61 TASK 801 FMC BITE. FOUND FAULT MSG 22-11360 (CONDITIONS INHIBIT BITE ENTRY FOR FCC-A) THEN ACCOMPLISHED FIM 22-11 TASK 801 DFCS BITE. FOUND FAULMar 28, 2021 · N431AS · Boeing 737990ER · Autopilot ComputerSDR ASAA2021030634245Ecs · unknownFLIGHT DECK PRIMARY TEMP CONTROL INOP. GROUNDED - YES. ACCOMPLISHED `PZTC BITE TEST REF B737-900 AMM 21-61-00-700-806-002. LAST FLIGHT LEG HISTORY SHOWED FAULT FOR FLT DECK TRIM VALVE. PREV FLT LEG HISTORY SHOWED NO FAULTS. NO FAULTS SHOWED UPON VERIFICATION.Mar 6, 2021 · N431AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2021022034157Generator · faultedAPU WILL NOT START, 2 ATTEMPTS. GROUNDED - YES. REMOVED & REPLACED APU SGU, REF B737-900 AMM 49-41-21. OPS/LEAK CHECKS GOOD. APU BITE SHOWS NO CURRENT FAULTS. GROUND VERIFICATION TEST GOOD.Feb 20, 2021 · N431AS · Boeing 737990ER · AC Generator-AlternatorSDR ASAA2021021934156Bleed Valve · faultedAFTER STARTING ENGINES, LEFT BLEED DUCT PRESSURE INDICATES 9 PSI WITH ENGINE POWER AT IDLE, A/C PACKS IN AUTO AND ENGINE ANTI-ICE OFF. RIGHT BLEED DUCT PRESSURE INDICATES 20 PSI. GROUNDED - YES. ACCOMPLISHED VALVE HEALTH CHECK. RAN ENGINE AT IDLE NO HELP. Feb 19, 2021 · N431AS · Boeing 737990ER · Compressor Bleed Valve
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