N453AS

Service difficulty reports · 284

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 = 'N453AS' 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 ASAA2022032137735Unknown · unknownEMERGENCY EXIT SIGN, MIDDLE AISLE HANGING DOWN. GROUNDED - YES. SECURE EMERGENCY EXIT SIGN AT MIDDLE AISLE REF B737-900 AMM 33-51-01.Mar 21, 2022 · N453AS · Boeing 737990ER · Emergency LightingSDR ASAA2022020637364Unknown · unknownRIGHT FMC DURING PREFLIGHT SHOWING "MAP" FLAG AND "NO VSPD" ON COPILOTS INSTRUMENTATION. GROUNDED - YES. NOTICES EXTINGUISH WHEN FMC SELECTED TO EITHER BOTH ON LEFT OR RIGHT. BOTH FMC SENSOR PAGES FAIL THEIR OPPOSITE COMPUTER. CYCLED RIGHT FMC CB NORMAL OPERATFeb 6, 2022 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2022020337350Unknown · unknownZONE TEMP CONT ZONE LIGHT IS ON WITH RECALL. GROUNDED - YES. PERFORMED PZTC BITE PER B737-900 FIM 21-62 TASK 801 #2 CONTROLLER FAULTED CONTROL CABIN TRIM AIR VALVE. PERFORMED FIM 21-62 TASK 832 INITIAL EVALUATION CONTROL CABIN FAULT RESET. OPERATED PACKS FOR 1Feb 3, 2022 · N453AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2022010337065Spacer · debondedPER T/C 78472010 # 2 ENG FAN BLADE LUBE # 22 SPACER IS DISBONDED. GROUNDED - YES. REMOVED AND REPLACED #2 ENG, #22 SPACER REF TC 78472010.Jan 3, 2022 · N453AS · Boeing 737990ER · Turbine Engine Air Inlet SectionSDR ASAA2021122937052Battery · dischargedWHILE DOING EMERGENCY LIGHT OPS CHECK DISCOVERED AFT EMERGENCY LIGHT SIGN INOP. GROUNDED - YES. REPLACED M1673 BATTERY PACK PER B737-900 AMM 33-51-06 PG 201. EMERGENCY LIGHTS CHECKED GOOD.Dec 29, 2021 · N453AS · Boeing 737990ER · Emergency LightingSDR ASAA2021112636722Unknown · unknownON PREFLIGHT, FOUND C/B FOR THE RIGHT FRONT WINDOW HEAT POPPED (ON OVHD, WINDOW HEAT SWITCHES WERE ON AND RT FWD SHOWED AMBER OVERHEAT. GROUNDED - YES. INSPECTED WIRING CIRCUIT-NORMAL AND NO HISTORY REF B737-900 WDM 30-41-12. RESET C/B ON P6-12 PANEL (RT FRONTNov 26, 2021 · N453AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2021112436714Actuator · faultyDURING MASTER CAUTION RECALL AFTER STARTING MOTORS, L PACK LIGHT ILLUMINATED. LIGHT EXTINGUISHED WITH MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED LH PACK RAM AIR EXHAUST ACTUATOR (SRADA) REF B737-900 AMM 21-51-27/401. BITE TEST ON THE LEFT AND RNov 24, 2021 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2021111936655Unknown · unknown#1 PACK LIGHT ILLUMINATES WITH RECALL AND EXTINGUISHES WITH RESET. GROUNDED - YES. PERFORMED PZTC BITE REF B737-900 FIM 21-62 TASK 801. ON PREV FLT ON ZONE TEMP CONTROLLER 1, FOUND SRADA EXIT WAS FAULTED. PUSHED VERIFY ON CONTROLLER AND GREEN GO LIGHT ILLUMINANov 19, 2021 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2021110136480Unknown · unknownVTK AND LOSS OF FMC DATA ON CAPT MAP DISPLAY NO FMC DATA ON BOTH CDU'S CLEARED ITSELF WITHIN SIXTY SECONDS. GROUNDED - YES. PERFORMED B737-900 FIM 34-61-836 RESET BOTH FMC, OPS CHECK NORMAL. SEAMC DAVE NOTIFIED.Nov 1, 2021 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2021090735929Terminal · broken#2 ENGINE "B" LOOP INOP ON TEST. "A" TEST OK. GROUNDED - YES. CHECKED FOUND PREVIOUS REPAIR AT FAN UPPER B TERMINAL BROKEN. RETERMINATED RING TERMINAL REF SWPM 20-30-11. COMPLETED B737-900 FIM 26-10 TASK 805. #2 ENG FIRE DETECTION GROUND VERIFICATION TEST GOODSep 7, 2021 · N453AS · Boeing 737990ER · Fire Protection System WiringSDR ASAA2021072635591Autoland Sys · faultedINFO ONLY AUTOLAND UNSUCCESSFUL, NO FLARE ARM *. GROUNDED - YES. ACCOMPLISHED FAULT ISOLATION TASK FOR INBOUND CONDITION RELATED TO AUTOLAND PER B737-900 FIM 22-11 TASK 899 - DFCS FAULT REVIEW SHOWED NO RELEVANT FAULTS ON EITHER FCC AND DFCS GROUP #49 (LAND VEJul 26, 2021 · N453AS · Boeing 737990ER · Landing and Taxi AidsSDR ASAA2021062835203Terminal · detachedENG FIRE SW #2 DOES NOT LIGHT UP DURING FIRE TEST. GROUNDED - YES. FOUND #2 ENG FAN UPPER B TERMINAL DETACHED. CRIMPED NEW TERMINAL ON REF 737SWPM 20-30-11. FIRE TEST OPS NORMAL.Jun 28, 2021 · N453AS · Boeing 737990ER · Fire DetectionSDR ASAA2021052834976Pin · bentL/H STARTER MAGNETIC CHIP DETECTOR LOCKING PINS BENT. GROUNDED - YES. REPLACED L/H STARTER MAGNETIC CHIP DETECTOR WITH NEW.May 28, 2021 · N453AS · Boeing 737990ER · Engine StarterSDR ASAA2021041134545Power Supply · inoperativeUPON COMPLETION OF T/C 78233008 FOUND EXIT ROW SIGN INDICATOR DO NOT COME ON. GROUNDED - YES. REMOVED AND REPLACED REPLACED BATTERY PACK ASSY M1695. OPS NML. REF B737-900 AMM 33-51-06.Apr 11, 2021 · N453AS · Boeing 737990ER · Emergency LightingSDR ASAA2021041034542Fmc · failedLEFT FMC FAIL AT TOD FL 330 FOR 1 MIN THEN RECOVERED FOR REMAINDER OF FLIGHT. GROUNDED - YES. PERFORMED FMCS L&R INFLT FAULTS BITE - NO FAULTS LAST 10 FLTS. PERFORMED B737-900 FIM 34-61 TASK 836, INITIAL EVALUATION GOOD. GROUND VERIFICATION TEST GOOD.Apr 10, 2021 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2021021134079Control Panel · defectiveVERTICAL SPEED WINDOW HAS SEGMENTS DISPLAYED INCORRECTLY. GROUNDED - YES. REMOVED AND REPLACED DFCS MODE CONT PANEL REF B737-900 AMM 22-11-34-400-801, OPS NML REF AMM 22-11-34-740-801. ACCOMPLISHED DFCS MCP LRU REPLACEMENT TEST, GRP BITE 32, ALL TEST PASSED. AFeb 11, 2021 · N453AS · Boeing 737990ER · Autopilot SystemSDR ASAA2021020534059Modulating Valve · faultedCONT CAB ZONE TEMP LIGHT ILLUMINATES ON MASTER RECALL AND RESETS. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 21-62 TASK 801. FOUND FLT DECK TRIM VALVE FAULT. REPLACED ZONE TRIM AIR MODULATING VALVE PER B737-900 AMM 21-61-21-401, OPERATIONAL CHECK GOOD. NO FAULTFeb 5, 2021 · N453AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2021013033971Modulating Valve · faultyCONT CAB ZONE TEMP LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED B737-900 FIM 21-62 TASK 842 "FLIGHT DECK TRIM VALVE" FAULT ACTIVE. REMOVED AND REPLACED FLIGHT DECK TRIM VALVE REF B737-900 AMM 21-61-21. PERFORMED BITE TEST, NO DEFECTS NOTED. LEAK CHECK GOOJan 30, 2021 · N453AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2021012933974Controller · inoperativeCONT CABIN ZONE TEMP LT ILLUM ON PUSH BACK. GROUNDED - YES. RELEASED PER MEL 21-21G. FLIGHT DECK PRIMARY TEMP CONTROL INOPERATIVE. PERFORMED B737-900 FIM 21-62 TASK 801. BITE TEST PASSED. CONT CABIN LIGHT REMAIN EXTINGUISHED ON RECALL.Jan 29, 2021 · N453AS · Boeing 737990ER · Cabin Temperature ControllerSDR ASAA2020112633603Warning Light · false activationRT FWD WINDOW HEAT INDICATED OVERHEAT ON INTIAL POWER UP BEFORE START. GROUNDED-YES. EXECUTED QRH AND LIGHT DID NOT COME BACK ON WHEN TRIED AGAIN AFTER THREE MINUTES.Nov 26, 2020 · N453AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2020102233402Acm · inoperativeAFTER LANDING LEFT PACK LIGHT ILLUMINATED. AT GATE, LOUD NOISE OBSERVED FROM LEFT PACK. GROUNDED-YES. REPLACED THE LT PACK ACM, LEAK AND OPERATIONS CHECK GOOD, REF B737-900 AMM 21-51-04/401. REPAIR CONFIRMATION SUCCESSFUL, REF B737-900 FIM 21-53 TASK 820 AOct 22, 2020 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2020101933386Actuator · inoperativeLEFT PACK LIGHT ILLUMINATED AT CRUISE. QRH PROCEDURE COMPLETED AND UPON TRIP RESET THE LIGHT EXTINGUISHED. SHORTLY AFTERWARDS ON MASTER CAUTION RECALL, THE PACK LIGHT ILLUMINATED BUT EXTINGUISHED UPON MASTER CAUTION RESET. REILLUMINATED AT CRUISE AND PACK LOct 19, 2020 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2020101333347Actuator · inoperativeHAD A LEFT PACK LIGHT ILLUMINATED AT CRUISE, RAN THE CHECKLIST & PUSHED THE TRIP RESET AND THE LIGHT EXTINGUISHED. RESET SEVERAL TIMES. GROUNDED-YES. REMOVED AND REPLACE LT PACK SMART RAM AIR ACUATOR AFT. OPERATIONS CHECKS GOOD, ACCOMPLISHED BITE CHECK, NOOct 13, 2020 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2020100833296Warning Light · illuminatedLEFT PACK CAUTION LIGHT ON DURING CRUISE AT FL 360. RAN QRH AND PACK LIGHT WENT OFF, BUT ILLUMINATES W/RECALL ROUGHLY 10 MIN LATER RECEIVED LT PACK CAUTION LIGHT AGAIN. CAUTION CLEARED AGAIN AFTER QRH. GROUNDED-YES. VERIFIED FAULT, ACCOMPLISHED PACK TEMP COct 8, 2020 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2020100733292Fmc · failedMULTIPLE INTERMITTENT SINGLE AND DUAL FMC FAILURES IN FLIGHT, LASTING BETWEEN :20-1:00. ALWAYS SELF-RESTORED PRIOR TO QRH COMPLETION. GROUNDED-YES. PERFORMED B737-900 FIM 34-61 TASK 801 AND FIM 34-61 TASK 806. FMC'S RESET OK FOR SERVICE.Oct 7, 2020 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2020091833191Processor · failedCENTER TANK FUEL QUANTITY INDICATOR INTERMITTENTLY INOP AFTER REACHING ZERO LBS. GROUNDED-YES. ACCOMPLISHED A TANK AND COMPENSATOR UNITS TEST, REF B737-900 AMM 28-41-21-710-801. NO DEFECTS NOTED. PERFORMED RING-OUTS BETWEEN D11316 (CENTER TANK BUSSING PLUGSep 18, 2020 · N453AS · Boeing 737990ER · Fuel Indicating SystemSDR ASAA2020091413168Oil Cooler · leakingNR 1 ENG IDG AIR/OIL HEAT EXCHANGER LEAKING. GROUNDED - YES. REPLACED THE NR 1 IDG OIL COOLER, LEAK CHECK GOOD, REF B737-900 AMM 24-11-21/401.Sep 11, 2020 · N453AS · Boeing 737990ER · AC Generator-AlternatorSDR ASAA2020082433067Spacer · vibrationNR 2 ENGINE TREND DATA SHOWS A RISE IN LOW PRESSURE ROTOR VIBRATION LEVELS WITH EXCESSIVE SCATTER. GROUNDED - YES. REMOVED AND REPLACED 1EA SPACER AND REPLACED ALL FAN BLADE SHIMS. WORK ACCOMPLISHED PER T/C 78472010. VERIFIED SPINNER CONE WEIGHTS MATCH WHAAug 23, 2020 · N453AS · Boeing 737990ER · Turbine Engine Air Inlet SectionSDR ASAA2020081973037Fmc · intermittentAFTER LANDING, INTERMITTENT FMC FAILURE LEFTSIDE. GROUNDED - YES. PERFORMED B737-900 FIM 34-61 TASK 836, STEPS A THRU E. GROUND VERIFICATION OF THE LEFT SIDE FMC COMPUTER SUCCESSFUL. FMC SWITCH BACK TO NORMAL POSITION. FMC IS AN ETOPS SIGNIFICANT SYSTEM.Aug 17, 2020 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2020071632900Connector · looseLEFT PACK LIGHT ILLUMINATES ON RECALL, MASTER CAUTION RESET CLEARS PACK LIGHT. GROUNDED - YES. NR 1 PACK/ZONE TEMP CONTROLLER BITE SHOWS HARD FAIL "PACK SENSOR" FAULT. NR 2 PACK/ZONE TEMP CONTROLLER BITE SHOWS HARD FAIL "STBY PACK SENSOR" FAULT. FOUND LOOSJul 14, 2020 · N453AS · Boeing 737990ER · Air Conditioning System WiringSDR ASAA2020071312886Sensor · inoperativeLT PACK TEMP NOT INDICATING. GROUNDED - YES. REMOVED AND REPLACED LT PACK TEMP BULB. OPS CHECK GOOD IAW AMM TASKS 21-51-60-000-801/-400-801.Jul 11, 2020 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2020071302885Acm · seizedON GROUND AFTER ENGINE START LEFT PACK LIGHT ILLUMINATED. PUSHING MASTER CAUTION LIGHT DID NOT EXTINGUISH THE PACK LIGHT PER QRH PROCEDURE. CONSULTED WITH DISPATCH AND MAINTENANCE. RETURNED TO GATE. GROUNDED - YES. CONFIRMED FAULT, PACK TRIPS AFTER 2-3 MIN OF Jul 10, 2020 · N453AS · Boeing 737990ER · Cabin Cooling SystemSDR ASAA2020061523797Wire Harness · inoperative#2 ENGINE B FIRE LOOP INOP. GROUNDED - YES. REMOVED AND REPLACED #2 ENGINE FAN FIRE DETECTION HARNESS MW0316 REFERENCE B737-900 AMM 26-11-02-400-801 AND 26-11-02-000-801. NO HELP. FOUND TERMINAL ON MW0326 BROKEN AT RIGHT HAND CORE FIRE DETECTION ELEMENT. REMOVJun 12, 2020 · N453AS · Boeing 737990ER · Fire Protection System WiringSDR ASAA2020060132770Start Valve · failedON ENGINE START NR 2 ENGINE FAILED TO START. NR N1 START VALVE DIDN'T OPEN. REMOVED & REPLACED NR 2 ENGINE START VALVE IAW AMM 80-11-03.May 28, 2020 · N453AS · Boeing 737990ER · Engine Start Valves/ControlsSDR ASAA2020040632614Control Valve · failedPER SEAMC IN CONVERSATION WITH CREW, AFTER ENGINE START ON RECALL ZONE TEMP CAUTION LIGHT ON FOR TEMP CONTROL. GROUNDED - YES. CONFIRMED FAULT, "CONT CAB" ZONE LIGHT ILLUMINATES ON RECALL. NO. 2 PACK/ZONE TEMP CONTROLLER BITE SHOWS HARD FAIL "FLIGHT DECK" TCV Apr 2, 2020 · N453AS · Boeing 737990ER · Cabin Temperature Control SystemSDR ASAA2020032332511Transmitter · failedON APPROACH SELECTED FLAPS 1 THE FLAP INDICATOR SHOWED SYMETRICAL FLAP INDICIATION JUST BELOW FLAP 1 INDICATION WHEN SELECTING FLAPS 5 NO MOVEMENT OF FLAPS INDICATOR ACCOMPLISHED TRAILING EDGE FLAP DISAGREE CHECKLIST LANDED FLAPS 15. GROUNDED - YES. EMERGENCY Mar 19, 2020 · N453AS · Boeing 737990ER · Trailing Flap Position Indicating SystemSDR ASAA2020031832457Control Unit · faultyLEFT SIDE WINDOW OVERHEAT ON TAKEOFF. ACCOMPLISHED QRH LIGHT RE-ILLUMINATED AFTER COOLING PERIOD. GROUNDED - YES. COULD NOT DUPLICATE ON GROUND. REF B737-900 AMM 30-41-11. DUE TO HISTORY REMOVED AND REPLACED, M322 LEFT-SIDE WHCU. OPS TEST NORMAL.Mar 16, 2020 · N453AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2020022422245Display · malfunctionedDUAL CDU FAIL W/ VTK ON BOTH MFD'S. A/T LIMITS MESSAGE ON UPPER DU. BOTH SYSTEMS RESTORED WITHOUT PILOT ACTION IN APPROX 30 SECONDS. DID NOT LOSE LNAV/VNAV. GROUNDED - YES. PERFORMED B737-900 FIM 34-61 TASK 807. FAULT DEEMED TO BE INTERMITTIENT. NO HISTORY LASFeb 22, 2020 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2020020542083Connector · dirtyAFTER AUTO PILOT "A" WAS ENGAGED SPEED TRIM FAIL LIGHT ILLUMINATED. AFTER SEVERAL SECONDS SPEED TRIM FAIL LIGHT EXTINGUISHED LESS THEN 60 SECONDS ELAPSED AND STAB OUT OF TRIM LIGHT ILLUMINATED. WE FOLLOWED PROCEDURE IN QRH. GROUNDED - YES. DIVERSION TIME 52 MIFeb 4, 2020 · N453AS · Boeing 737990ER · Auto Flight System WiringSDR ASAA2020013172021Window · faultedLEFT SIDE WINDOW HEAT OVERHEAT CAME ON DURING CRUISE FAULT CODE 304 010 41. GROUNDED - YES. VISUAL INSPECTION OF PRIMARY AND SPARE SENSOR SHOWS DELAM. VERIFIED LH SIDE WINDOW RESISTANCE IAW B737-900 AMM 30-41-21. RESISTANCE READS 67.7 OHMS. MOVED WINDOW HEAT PJan 27, 2020 · N453AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2020012863981Fmc · malfunctionedDURIING CLIMBOUT AT FL280, EXPERIENCED SINGLE LEFT FMC FAILURE THAT CORRECTED ITSELF WITHIN 1 MINUTE. GROUNDED - YES. PERFORMED FMC BITE/IN FLT FAULTS TO CHECK FMC OPS STATUS. NO CURRENT FAULTS. R/H FMC DID RECORD LEFT FAIL ON LAST FLT LEG-NO OTHER FAULTS. NO Jan 26, 2020 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2020012753967Warning Message · false activationLEFT SIDE WINDOW OVERHEAT ON CLIMB OUT. RAN QRH PROCEDURES, LIGHT EXTINGUISHED. GROUNDED - YES. VERIFIED LEFT SIDE WINDOW HEAT WORKING NORMAL. PERFORMED WHCU BITE REF B737-900 FIM 30-41 TASK 801, NO CURRENT FAULTS LOGGED BUT NOTED WINDOW SENSOR FAULT ON HISTORJan 25, 2020 · N453AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2020011831913Switch · illuminatedLEFT SIDE WINDOW HEAT SWITCH REMAINED ILLUMINATED AFTER ACCOMPLISHED QRH CHECKLIST. GROUNDED - YES. PERFORMED BITE CHECK ON WINDOW HEAT CONTROLLER UNIT, CYCLED WINDOW HEAT SWITCHES IAW B737-900 FIM 30-41 TASK 801 NO FAULTS NOTED.Jan 18, 2020 · N453AS · Boeing 737990ER · Windshield/Door Rain/Ice RemovalSDR ASAA2020011731880Unknown · malfunctionedMULTIPLE LEFT FMC FAILURES FOLLOWED BY A DUAL FMC FAILURE. RESTORED BY CHECKLIST. GROUNDED - YES. SYS LOGGED PGRM FAULT ACCOMPLISHED TASK 34-61-807 . SYS OPS OK.Jan 15, 2020 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2020011431849Wire Harness · chafedWHILE PERFORMING GVI INSP ON NR 2 ENG FOUND MW0311 HARNESS CHAFFED THRU. REQ REPLACEMENT. GROUNDED - YES. REMOVED AND INSTALLED NEW MW0311 HARNESS. PERFORMED HARNESS TEST REF AMM 71-51-03 STEP H. ALL TESTS PASSED.Jan 13, 2020 · N453AS · Boeing 737990ER · Powerplant System WiringSDR ASAA2019120641515Fmc · faultedUPON LANDING FMC WENT BLANK AND NOT AVAILABLE ON MENU WHEN FMC CAME BACK, ALL INFO WAS LOST. GROUNDED - YES. RESET FMC SYSTEM PER B737-900 FIM 34-61 TASK 836. ETOPS GROUND VERIFICATION GOOD.Dec 4, 2019 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2019103081170Fmc · failedAT CRUISE CA FMC FAIL - CAME BACK ON BEFORE QRH COMPLETED. OPERATION NORMAL. GROUNDED - YES. PERFORMED FMC RESET PER FIM 34-61 TASK 836. ETOPS GROUND VERIFICATION NORMAL. A/C OK FOR SERVICE.Oct 28, 2019 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2019102193052Fmc · malfunctionedVTK/ MAP FLAGS LEFT FMC. QRH PROCEDURE COMPLETED. OPS NORMAL. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 34-61 TASK 801. LEFT FMC OPS CHECK GOOD. THIS CLEARS MEL 34-36J.Oct 19, 2019 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2019092730850Fmc · malfunctionedLNAV AND VNAV DISENGAGED ON TAKE-OFF ROLL. FLIGHT DIRECTORS DISAPPEARED FROM BOTH PRIMARY FLIGHT DISPLAYS. LNAV AND VNAV RE-ENGAGED WHEN RE-SELECTED ON CLIMBOUT WITH NO FURTHER PROBLEMS. THE EXACT PROBLEM HAPPENED ON TWO TAKE-OFFS IN A ROW. GROUNDED - YES. PERSep 27, 2019 · N453AS · Boeing 737990ER · Flight Management Computing Hardware SystemSDR ASAA2019093025843Overheat Loop · failedAPU DETECTOR INOPERATIVE LIGHT. GROUNDED - YES. CONFIRMED FAULT, APU WILL NOT TEST. ACCOMPLISHED APU FIRE DETECTION LOOP RESISTANCE, SYSTEM TESTED IAW AMM 26-15-00-730-801 & RE-CONFIRMED APU TAIL PIPE OVERHEAT DETECTOR ASSY M1925 WAS DEFECTIVE, SHOWS 1.7M OHSep 25, 2019 · N453AS · Boeing 737990ER · Overheat Detection
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