JASC 4940

Service difficulty reports · 1,424

Reports filed under 4940 · APU Start/Ignition System, 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 jasc_code = '4940'
  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 ASAA1159422Exciter · faultyNR 1 START ON APU NO LIGHT OFF WITH FAULT LIGHT ILLUMINATED. NR 2 START ON APU NO LIGHT OFF LOW OIL PRESS LIGHT ONLY ILLUMINATED. REPLACED APU IGNITER BOX. PER MM 49 41 31 000 AND 49 41 31 400. OPS CHECK GOOD.Apr 10, 2011 · N586AS · Boeing 737890SDR HALA2011041000150Exciter · inoperativeETOPS SIGNIFICANT SYS - APU INFLIGHT START UNSUCESSFUL. T/S IAW 49-62-00 APU BITE SHOWS EXCITER IAW AMM 49-41-38. INSTALL NEW EXCITER IAW AMM CKS OK, SUCCESFUL APU START ON FIRST TRY.Apr 10, 2011 · N382HA · Airbus A330243SDR ASAA1159366Ignition Sys · malfunctionedATTEMPTED TO START THE APU NO LIGHT OFF THEN THE "FAULT" LIGHT ILLUMINATED. AFTER APPROX 5 MINUTES THE FAULT LIGHT WENT OUT. PERF APU BITE CHECK FOUND FAULT CODE 49 41011 NO FLAME SHUTDOWN LOGGED ACCOMP FAULT ISOLATION PROCDEURES NO FAULTS. AS PRECAUTIONARYMar 31, 2011 · N593AS · Boeing 737890SDR HALA2011032100129Starter · faultyAPU FAULT DURING START ATTEMPT. REPLACED STARTER ASSY AND CONFIRMED APU STARTED NORMAL.Mar 21, 2011 · N586HA · Boeing 7673G5SDR ASAA1159247Unknown · malfunctionedAPU FAULT NO ROTATION 49 41012. PERFORMED FIM 49 40 TASK 803. NO CORRESPONDING FAULTS RECORDED. ATTEMPTED START WITH SUCCESSFUL START. NO FAULTS RECORDED. OPS CHECK NORMAL.Mar 14, 2011 · N564AS · Boeing 737890SDR HALA2011021600101Starter · failedETOPS SIGNIFICANT SYS - APU NO START ON OVERNIGHT CHECK. R & R APU STARTER IAW AMM 49-41-01. OPS/SECURITY CK OK.Feb 16, 2011 · N586HA · Boeing 7673G5SDR HALA2011012500048Igniter · failedETOPS SIGNIFICANT SYS - APU WILL NOT START. BITE CHECK APU ECU "START CIRCUIT" FAULT FOUND. INSP APU, FOUND IGNITOR PLUG WET. R & R APU IGNITER IAW AMM 49-41-02, GROUND RUN CHECK OK. 3X STARTED WITH NO FAULTS.Jan 25, 2011 · N585HA · Boeing 7673G5SDR UALA2011012500404Battery · faultyAPU DID NOT START, TRIED 3 TIMES. 2 MORE ATTEMPTS. EGT 770, RPM 20. NO LRU'S FAULTED ON APU CONTROLLER. ACFT REROUTED NON-ETOPS TO BASE FOR FIX. REPLACED APU BATTERY AND APU BATTERY CHARGER IAW MM.Jan 24, 2011 · N552UA · Boeing 757222SDR HALA2011012400043Ignition Unit · wornETOPS SIGNIFICANT SYS - APU WILL NOT START. NO LIGHT OFF, R & R IGNITION UNIT IAW 49-41-03 AND IGNITION PLUG IAW 49-41-02, OPS CHECKED OK.Jan 24, 2011 · N585HA · Boeing 7673G5SDR CA110125036Starter · failed(CAN) THE CUSTOMER ATTEMPTED TO START THE APU. THEY SAY THE APU IN BITE CAS MESSAGE SHOWING A NORMAL CONDITION BUT WHEN THEY SELECTED THE COCKPIT SWITCH IN THE START POSITION, THE APU WOULDN`T START. TROUBLESHOOTING REVEALED THAT THE ASCA (APU START CONTACTOR Jan 18, 2011 · Bombdr BD7001A10SDR UALA2011011300205Motor · faultySTATUS MESSAGE APU CONTROL. COMPLIED WITH MEL. AHM INDICATES MESSAGE 49-10760 E-STARTER BRUSH WEAR FIM 49-40 TASK 807. REPLACED APU STARTER MOTOR PER MM.Jan 13, 2011 · N215UA · Boeing 777222SDR SIMA201101101Shunt · shortedDURING MAINTENANCE BASE VISIT THE AUXILIARY POWER UNIT SHUNT ATTACHED TO FRAME 80 SHORTED CAUSING A BURNED HOLE THROUGH FRAME 80. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED PERMANENT REPAIR TO REAR FUSELAGE FRAME 80 IAW EO EM-53MR-1745. THE AIRCRAFT WJan 10, 2011 · N737MW · Emb EMB135LRSDR UALA2011011000159Switch · failedAPU NO START ON THE GROUND. APU FAILED TO START SEVERAL TIMES. BIT OF ECU SHOWS CURRENT LAST RUN, RUN ABORTED "AC START CIRCUIT". APU DOOR CONTROL SWITCH REPLACED. RAN APU FOR 2 HOURS AND PERFORMED MULTIPLE APU STARTS. APU CHECKED GOOD, NO FAULTS.Jan 9, 2011 · N552UA · Boeing 757222SDR UALA2011010700112Charger · faultedAPU FAILED TO START. FAULT LIGHT ILLUMINATED AND EICAS MESSAGE. APU FAULT DISPLAYED. REPLACED APU. AFTER APU REPLACEMENT STILL UNABLE TO START, FOUND BATTERY VOLTAGE DURING CRANK CYCLE AT 8VDC. REPLACED APU BATTERY AND CHARGER PER MM. OPS CKS NORMAL.Jan 7, 2011 · N552UA · Boeing 757222SDR HALA2011010400009Ecu · malfunctionedETOPS SIGNIFICANT SYS - APU AUTO SHUTDOWN AT GATE RESTART. AUTO SHUTDOWN AGAIN. IAW MOC ACCOMP FIM 49-11-00/101, FIG 138 AUTO SHUTDOWN. "DC PWR LOSS" ON BITE. BLOCKS 1, 20, 42 SYS OK. BITE CK ECU DOES NOT LAMP TEST, SELF TEST. BITE CK FAULT REASONS ECU. REPLJan 4, 2011 · N590HA · Boeing 7673CBSDR UALA2011010300021Starter · faultyAPU APUC DETECTED FAULT THAT WOULD CAUSE AUTOMATIC SHUTDOWN OF APU IN UNATTENDED MODE OPERATION, OR COMPLETE LOSS OF APUC BUSS ACTIVITY (BOTH LT AND RT 629) FOR 3 SECONDS AFTER THE APU MASTER CONTROL SWITCH HAS BEEN IN THE ON POSITION FOR 10 SECONDS. REPLACED Jan 3, 2011 · N794UA · Boeing 777222SDR UALA2010122704727Charger · inoperativeEICAS STATUS MESSAGE "BATTERY CHARGER". REPLACED APU BATTERY AND REPLACED APU BATTERY CHARGER IAW MM, GROUND OPS CK OK. NO FAULTS NOTED.Dec 26, 2010 · N179UA · Boeing 747422SDR ASAA1058653Converter · failedDURING THE EEP CHECK THE APU GEN VOLTS & FREQS SHOWING 0 FREQS AND 2 VOLTS. DIVERSION TIME 121 MINUTES. VERIFIED DISCREPANCY. PERFORMED APU AND GCU BITE. NO FAULTS NOTED. REMOVED AND REPLACED APU START CONVERTER PER AMM 49 41 61. OPS NORMAL. APU GEN BUS Dec 19, 2010 · N592AS · Boeing 737890SDR ASAA1058652Converter · faultyAPU WILL NOT START. (NOTE: ON BATTERY PWR) CHANGED A/C MAIN BATTERIES, NO HELP. CHANGED START CONVERTER UNIT REF AMM 49 41 61 000 801 AND AMM 49 41 61 400 801. OPS NORMAL. REF AMM 24 31 11 FOR BATTERIES OPS NORMAL PER SAME.Dec 19, 2010 · N593AS · Boeing 737890SDR MYWA100126Unknown · malfunctionedETOPS SIGNIFICANT SYSTEM: APU FAULT LIGHT ON AND APU DOES NOT START. PERFORMED APU BITE TEST, PUT GPU ON LINE FOR 40 MINUTES THEN PERFORMED NORMAL APU START.Dec 7, 2010 · N740EH · Boeing 7378DCSDR ASAA1058570Starter Gen · failedWHILE PRESSURIZING WATER SYSTEM FOR OPERATION APU SHUT ITSELF DOWN. STARTED APU AND AFTER 30 SECONDS THE APU SHUT ITSELF DOWN WITH A FAULT LIGHT PERFORMED BITE CHECK AND FOUND FAULT CODE 49 94299 PERFORMED FIM 49 90 00 810 809. REMOVED AND REPLACED OIL FILTENov 28, 2010 · N583AS · Boeing 737890SDR HALA2010111900553Ecu · faultedETOPS SIGNIFICANT SYSTEM - APU AUTO SHUTDOWN ON FIRST START ATTEMPT. SECOND START NORM. APU OIL QTY SHOWED 0.50 THEN RECOVERED TO FULL AFTER START. PERFORMED FIM 49-11-00 FIG 104. BITE CK OF APU ECU FOUND LOP FAULT. CHECKED APU OIL LEVEL OK, APU OPS CK OKNov 19, 2010 · N584HA · Boeing 7673G5SDR ASAA1058507Exciter · failedDURING APU REPLACEMENT FOUND IGNITION EXCITER INOP. REPLACED APU EXCITER REF MM 49 41 31, OPS CHECKS GOOD.Nov 14, 2010 · N581AS · Boeing 737890SDR HALA2010101400467Starter · failedETOPS SIGNIFICANT SYS - APU FAILED TO START UPON ARRIVAL. APU ECU BITE IAW FIM 49-11-00. NO FAULTS, NO FLAGS. TRIED APU START ATTEMPT UNSUCCESSFUL, RPM ONLY 20 PERCENT. R & R APU START ASSY. OPS CK GOOD. AMM 49-41-01. SECURED APU DOOR. APU STARTED SUCCOct 14, 2010 · N584HA · Boeing 7673G5SDR UALA2010100703721Module · faultyAPU AUTO SHUTDOWN TWICE DURING START ATTEMPTS. MAX RPM 27 PERCENT. BATTERY VOLTAGE DROPS TO 18V DURING START. REPLACED STARTER AND FLOW SENSING MODULE IAW AMM. APU STARTED NORMALLY SEVERAL TIMES, NORMAL APU BLEED PRESSURE DURING ENGINE STARTS AND ELECTRICALOct 6, 2010 · N667UA · Boeing 767322SDR MYWA100110Starter · inoperativeETOPS SIGNIFICANT SYSTEM: APU MAINTENANCE LIGHT ILLUMINATED AND APU WOULD NOT RESTART.Sep 29, 2010 · N733MA · Boeing 73781QSDR UALA2010092303540Starter · failedON APU START - STATUS MESSAGE APU CONTROL. ELECTRIC STARTER HAS BRUSH WEAR. APU STARTED NORMALLY. REPLACED APU ELECTRIC STARTER AND OPS NORMAL.Sep 22, 2010 · N228UA · Boeing 777222SDR UALA2010091303385Starter · faultyAPU WILL NOT START. HANGS BETWEEN 25 AND 35 PERCENT RPM AND SHUTS DOWN WITH FAULT LIGHT ON. CREW COMMENTS: HANGS AT 27. BATTERY SHOWS 28V, CHIP DETECTOR CHECKED, NO METAL ON CD, APU STARTER MOTOR REPLACED IAW AMM. 2 SUCCESSFUL STARTS PERFORMED WITHOUT PROBLEM.Sep 9, 2010 · N661UA · Boeing 767322SDR HALA2010082800382Control Valve · failedETOPS SIGNIFICANT SYS - APU FAILED TO START (2X) APU FAULT. APU ECU BITE CK SHOWS "FIRE EMERG" & "REV FLOW" FAULTS WIRING CKS GOOD FROM RELAY K421 TO SHUTDOWN SW S484 REPL K421 FOR PRECAUTION IAW FIM 49-11-00, FIG 103. R & R SURGE CONTROL VALVE IAW AMM 49-53Aug 28, 2010 · N598HA · Boeing 767332SDR UALA2010082303103Charger · failedAPU WILL NOT START. HANGS BETWEEN 25 & 35 PERCENT RPM & SHUTS DOWN WITH FAULT LIGHT ON. ATTEMPTED 3 STARTS. 1ST START APU STARTED UP NORMAL. 2ND START APU START VERY SLOW & STARTED TO HANG AT 35 PERCENT. 3RD ATTEMPT APU HAD A HUNG START & FAULTED. EGT NORAug 20, 2010 · N668UA · Boeing 767322SDR UALA2010080902885Exciter · malfunctionedAPU NO START 3 ATTEMPT SWITCH FAULT LIGHT. REPLACED APU IGNITER AND IGNITION EXCITER AS PER MM, OPS CHECKED GOOD.Aug 8, 2010 · N665UA · Boeing 767322SDR UALA2010080402818Exciter · failedATTEMPTED TWO STARTS OF APU, NO LIGHT OFF AND FAULT LIGHT DISPLAYED. REPLACED EXCITER BOX. FL 340 APU RUNS NORMAL. CREW CONFIRMED APU OPERATED NORMAL.Aug 3, 2010 · N543UA · Boeing 757222SDR C2XA10CL123Starter Gen · failedCLE FLT 2785 THE CREW REPORTED A BURNING SMELL IN THE COCKPIT FOLLOWED BY APU FAIL. MAINTENANCE INSPECTED AND REPLACED THE APU STARTER/GENERATOR. OPERATIONAL CHECKS WERE GOOD.Aug 3, 2010 · N21537 · Emb EMB145LRSDR UALA2010080202780Exciter · faultyAPU FAULT ON START DURING TAXI IN. APU BITE INDICATES FAULTY IGNITION UNIT. NO TIME TO FURTHER TROUBLESHOOT. REPLACED IGNITER, CABLE AND BOX PER MM'S, OPS OKAY.Aug 1, 2010 · N543UA · Boeing 757222SDR A6WA201040540Ignition Unit · inoperativeAPU WILL NOT START, START SEQUENCE NORMAL TO 25 PERCENT RPM, THEN RPM HANGS AND STRONG ODOR OF JET FUEL PRESENT. RAMP AGENTS REPORT SMOKE FROM APU EXHAUST. REPLACED APU IGNITION UNIT IAW AMM 49-41-01. OPS CK OF APU GOOD AT THIS TIME.Jul 21, 2010 · N464AW · Cndair CL6002B19SDR ASAA1058085Ground Stud · looseWHILE ACCOMPLISHING TC 7824900 FOUND APU FAULT CODE 49 41250. WHILE T/S APU CODE 49 41250 FOUND APU DRAWING 280 290 AMPS FROM BATTERY DURING START WITH GROUND POWER CONNECTED. FOUND APU START PWR UNIT GROUND STUD LOOSE. REPLACED APU START PWR UNIT REF MM 49Jul 19, 2010 · N518AS · Boeing 737890SDR ASAA1058011Starter Gen · malfunctionedAIRCRAFT DID NOT ACCEPT APU ELECTRICAL POWER AFTER LANDING SHUT DOWN APU. SUBSEQUENT RESTART OF APU INDICATED LOW OIL PRESSURE AND FAULT LIGHT. NO RESTART ACCOMPLISHED. FAULT WAS VERIFIED A HARD FAULT NO APU ROTATION. REMOVED AND REPLACED APU STARTER / GENJun 25, 2010 · N577AS · Boeing 737890SDR REXA201000073Starter · malfunctionedTHE CREW REPORTS THAT THERE WAS A STRONG "FUME" SMELL IN THE CABIN, STRONGEST IN ROW 14. ACFT LANDED UNEVENTFULLY. ATLANTA MAINTENANCE RAN BOTH PACKS AND COULD NOT DUPLICATE THE SMELL, HOWEVER MAINTENANCE DID FIND THAT THE APU HAD AN OVERTEMP CAUTION CODE WHMay 5, 2010 · N181PQ · Cndair CL6002D24SDR UALA2010040801184Exciter · faultyAPU FAULT 3 START ATTEMPTS NO START. ACCOMPLISHED BITE ON ECU-HAD "NO FLAME" WITH FAULT UNITS OF "IGN UNIT,"FUEL CONTROL" AND "NR 2 TC RAKE." REPLACED APU IGNITION UNIT AND IGNITION LEAD, AND IGNITION PLUG. STARTED APU ON FIRST ATTEMPT.Apr 7, 2010 · N590UA · Boeing 757222SDR UALA2010032200955Exciter · malfunctionedAPU FAILED STARTS. ACCOMPLISHED TEST AND APU FAILED INITIAL START TEST WITH MASTER SW TO START: FUEL SOL LT, IGNIT FUEL DIV, DE-OIL, BLEED RELAY LOP & HOT NEVER CAME. STATIC CHECK RES CHECKED OK. ACCOMPLISHED TEST WITH APU TESTER IAW MM AND APU FAILED INIMar 21, 2010 · N590UA · Boeing 757222SDR HALA2010032100130Relay · failedETOPS SIGNIFICANT SYS - APU FAILED TO START FAULT LIGHT ILLUM ICAS MSSG APU FAULT DISPLAYED 2ND ATTEMPT INDICATES EGT HIGH. FRM CODE: 49110900. PERFORMED FIM 49-11-00 FIGURE 103-APU BITE PROCEDURE, FOUND MINI FLAG 34, PERFORMED FIM 49-11-00 FIG 106A, REPLACED Mar 21, 2010 · N583HA · Boeing 76733ASDR HALA2010030800094Connector · dirtyETOPS SIGNIFICANT SYSTEM - APU FAILED TO START TWO ATTEMPTS. BITE TEST DONE ON ECU SHOWING "LOW OIL PRESS" VIS CK APU OIL AT FULL. CLEANED ELECTRICAL PLUG OF LOW OIL TEMP SWITCH AND RERACKED APU ACU. RESTARTED, APU WORKS NORMALLY. ALL PARAMETERS NORMAL BITMar 8, 2010 · N588HA · Boeing 7673CBSDR UALA2010021500586Starter · failedAPU FAILED TO START. FAULT LIGHT ILLUMINATED & EICAS MSG. APU FAULT DISPLAYED. ADDITIONAL START ATTEMPTS UNSUCCESSFUL. REPLACED APU STARTER & APU CRANK CONTACTOR. FOUND A 2" DIAMETER HOLE IN STARTER MOTOR CASING. REPLACED APU STARTER, AUTO SHUTDOWN WITH "LFeb 14, 2010 · N597UA · Boeing 757222SDR UALA2010012200269Controller · inoperativeAPU AIR STARTER APUC DETECTED LOSS OF AIR TURBINE STARTER FUNCTION. STATUS MSG-3610290 LATCHED TA MODE. REPLACED APU AT SCV & AIR TURBINE STARTER & APU SHUTOFF VALVE, ALL NO HELP. APU STILL DOES NOT START PNEUMATICALLY. REPLACED AIR SUPPLY CABIN PRESSURE CONJan 21, 2010 · N217UA · Boeing 777222SDR UALA2010011900239Motor · faultyAPU WILL NOT START. ECU BITE SHOWED SLOW START WITH STARTER CIRCUIT. T/S IAW MM AND FOUND STARTER MOTOR WITH EVIDENCE OF INTERNAL SHORTING. STARTER MOTOR BURNED. REPLACED STARTER. REPLACED APU CRANK CONTACTOR. APU WORKS NORMAL.Jan 16, 2010 · N597UA · Boeing 757222SDR MYWA100012Valve · inoperativeETOPS SIGNIFICANT SYSTEM - APU HANGS AT 40 PERCENT DURING START.Jan 13, 2010 · N752MA · Boeing 73748ESDR HALA2010011200016Starter · failedETOPS SIGNIFICANT SYS - APU FAILED TO START ON GROUND. T/S IAW FIM 49-11-00 FIG 105 REPLACED STARTER MOTOR IAW AMM 49-41-01, OP TEST GOOD. NO FAULTS, OK FOR SERVICE.Jan 12, 2010 · N580HA · Boeing 76733ASDR HALA2010010300001Ecu · faultedETOPS SIGNIFICANT SYS - DURING REQUIRED INFLT APU START RECEIVED EICAS MESSAGE "APU FAULT" AND OVERHEAD PANEL APU "FAULT" LIGHT. SECOND START ATTEMPT YIELDED SAME RESULT. FL 380, SAT -50 DEGREE, TAT -20 DEGREE, START TIME WAS LESS THAN 1 MINUTE, MAX EGT WAS Jan 3, 2010 · N586HA · Boeing 7673G5SDR UALA2009122303981Sensor · faultedAPU ALTITUDE NO START. APU HANGS BETWEEN 0-22 PERCENT DURING START. 0 EGT 23 PERCENT RPM IAW APU COLD START PROCEDURE. REPLACED APU BATTERY. REQUIRES APU HIGH ALT START BEFORE ACFT CAN BE ETOPS. APU ALTITUDE NO START. APU ROTATES BUT NO EGT INDICATIONS DURIDec 22, 2009 · N550UA · Boeing 757222SDR MYWA09068Starter · malfunctionedETOPS SIGNIFICANT SYSTEM - APU WOULD NOT START.Dec 10, 2009 · N738MA · Boeing 7378Q8
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