JASC 4970

Service difficulty reports · 272

Reports filed under 4970 · APU Indicating 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 = '4970'
  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 SWAA2026101474131Apu · fault messageAPU FAULT LIGHT ILLUMINATED. APU AUTO SHUTDOWN, TURNED APU SWITCH OFF ACCORDING TO QRH. FAULT LIGHT EXTINGUISHED AFTER 3 MIN. FOUND FAULT MSG 49-15003, PERFORMED IFIM TASK 49-10-00-810-803. APU FAULT LIGHT EXTINGUISHED & FAULT NOT ACTIVE MSG CLEARED.Oct 10, 2026 · N8841L · Boeing 7378SDR UIEA2025120501334Warning Message · illuminatedEICAS APU INDICATION IN FLIGHT. APU DUCT LEAK STATUS MSG. QRH COMPLIED WITH (APU FIRE HANDLE PULLED)(<P>OPERATED APU FOR ABOUT 3 HOURS WITH BLEED ON, NO LEAKAGE OBSERVED AND DETECTED REF AMM 49-11-00-862-001.Dec 5, 2025 · N856GT · Boeing 74787UFSDR ABXA20251019274Battery · faultedDURING TAXI ,APU BATTERY, NO STBY STATUS MESSAGE DISPLAYED. ADVISED BY MTC TO RETURN TO PARKING (BTB). MTX GROUNDED ACFT AND REMOVED AND REPLACED APU BATTERY IAW AMM 24-31-04 AND REMOVED AND REPLACED APU BATTERY CHARGER IAW AMM 24-31-04. OPS CHECK GOOD. ACFOct 19, 2025 · N1013A · Boeing 76736NSDR HALA20250728234Sensor · failedETOPS - APU AUTO SHUTDOWN. PERFORMED WIRING CHECKS OF SPEED SENSORS 59KV56 AND 59KV57 PER TSM 49-62-00-810-805-A. 59KV26 CONTINUITY GOOD. NO SHORTS TO GND. 59KV57 INTERMITTENT CONTINUITY WHEN TAPPING BEHIND SENSOR CONNECTOR. NO SHORTS TO GROUND. FOUND SPEJul 25, 2025 · N396HA · Airbus A330243SDR ASAA2023042342988Data Unit · faultyDURING APU TROUBLESHOOTING FOUND MESSAGE 49-72103 "DATA MEMORY MODULE CIRCUIT FAILURE". SUSPECT APU WIRING HARNESS. GROUNDED - YES. REF B737-800 FIM 49-70 TASK 806, REMOVED AND REPLACED APU WIRING HARNESS IAW B737-800 AMM 49-011-01. MAINT MSG 49-72103 STILL PRApr 23, 2023 · N570AS · Boeing 737890SDR ASAA2023022642081Module · faultyAIRCRAFT IS REPORTING REPETITIVE APU DMM CIRCUIT FAULT, 49-72105. GROUNDED - YES. PERFORMED TROUBLESHOOTING IAW B737-9 IFIM TASK 49-70-00-810-808. NO FAULTS FOUND. REMOVED AND REPLACED DATA MEMORY MODULE PREXCAUTIONARY IN REFERENCE WITH B737-9 AMM 49-72-11.Feb 26, 2023 · N943AK · Boeing 7379SDR ASAA2022090539823Memory Device · faultedAPU BITE SHOWS FAULT CODE 49-72101 LAST 18 STARTS. GROUNDED - YES. REMOVED AND REPLACED DATA MEMORY MODULE IAW B737-800 AMM 49-72-11.Sep 5, 2022 · N538AS · Boeing 737890SDR SWIA202266220Apu · out of adjustD: APU DOOR OPEN IN FLIGHT. WOULD NOT CLOSE. / C: DEFERRED APU DOOR OPEN PER MEL 49-14-1B. C/W MX ACTION. PLACARD INSTALLED. / CAT C DUE 8-4-22 / *** SMOD MUST BE CONTACTED BEFORE RETURNED TO SERVICE AFTER REPAIRS ARE COMPLETED DUE TO 2X ODI EVENTS *** / PER Jul 25, 2022 · N897SK · Cndair CL6002D24SDR ASAA2022050438232Module · fault messageTHE APU FAILED TO START ON TAXI IN . FAULT LIGHT ILLUMINATED. GROUNDED - YES. REMOVED & REPLACED DATA MEMORY MODULE REF B737-800 AMM 49-72-11-000/400-801. FAULT MESSAGE : 49-72101 AND 49-72105 CLEARED. OPS TEST GOOD. APU OPERATES NORMALLY. A/C OK FOR SERVICEMay 4, 2022 · N513AS · Boeing 737890SDR ASAA2021092536095Warning Light · illuminatedBLUE MAINT LIGHT ILLUMINATED AFTER STARTING APU ON THE GROUND AFTER LANDING. GROUNDED - YES. APU BITE CHECK SHOWS MAINT MESSAGE 49-72104 DATA MEMORY MODULE SHOW CIRCUIT FAILURE CYCLED POWER TO AIRCRAFT & REPAIR CONFIRMED. CHECKED AND RELEASED PER MEL 49-99A. ASep 25, 2021 · N597AS · Boeing 737890SDR UIEA2021091102005Fault Message · false activationAPU FAULT MAX EGT 778 RPM 39(<P>PERFORMED APU ECU BITE CHECK IAW 49-61-05. NO FAULTS PRESENT. PERFORMED OPERATIONAL CHECK OF APU IAW AMM 49-11-00. NO DEFECTS NOTED AT THIS TIME.</P>)Sep 9, 2021 · N640GT · Boeing 7673S1SDR ASAA2021090535866Thermocouple · faultedAPU FAULT X2 APU NOT STARTING. GROUNDED - YES. BITE CHECK C/W. FOUND FAULT MSG 49-491012 TWICE, AND 49-71147 & 49-71148 EGT 1&2 THERMOCOUPLE LOSS OF EGT SHUTDOWN, OPERATED APU, STARTED AND RAN NORMALY.Sep 5, 2021 · N530AS · Boeing 737890SDR UIEA2020122002596Warning Light · false activationITEM 3-APU FAULT ON LANDING/TAXI IN. RE-START OK. PERFORMED BITE CHECK OF THE APU ECU, IAW 49-61-05, NO FAULTS FOUND. OK FOR SERVICE.Dec 20, 2020 · N1409A · Boeing 767306SDR UIEA2020071501555Warning System · false activationAPU FAULT MESSAGE ON FIRST START ATTEMPT AFTER LANDING, SECOND ATTEMPT STARTED NORMALLY. PERFORMED BITE CHECK OF APU ECU. NO FAULTS FOUND, REF AMM CHAP 49-00-00.Jul 14, 2020 · N1409A · Boeing 767306SDR UIEA2020071401527Warning System · false activationAPU FAULT AFTER LANDING DURING 1ST START ATTEMPT. RE-START NOT ATTEMPTED. PERFORMED FIM PROCEDURE 49-11 F/T 958, NO FAULTS INDICATED. RESTART SUCCESSFUL. NO DEFECTS NOTED AT THIS TIME.Jul 10, 2020 · N1373A · Boeing 76731KSDR ASAA2020070632869Sensor · shortedAPU FAILURE TO START. FAULT MESSAGE INLET TEMP SENSOR SHOWS SHORT. GROUNDED - YES. REMOVED AND REPLACED APU INLET TEMP SENSOR PER AMM 49-61-31. OPS TEST NORMAL.Jul 4, 2020 · N519AS · Boeing 737890SDR UIEA2020060801217Warning System · false activationAPU FAULT EICAS MESSAGE WHEN ATTEMPTED START ON TAXI IN. PERFORMED BITE CHECK ON APU ECU, NO FAULTS FOUND. APU STARTED FIRST ATTEMPT REF AMM 49-11-00/49-61-05.Jun 5, 2020 · N1487A · Boeing 76731KSDR UIEA2020060101185Warning System · false activationAPU FAULT MSG. RECYCLED APU AND PERFORMED BITE TEST. NO FAULTS NOTED AT THIS TIME. EICAS SHOWS NO MESSAGES. APU AND OPERATIONAL IAW AMM 49-11-00 OK FOR SERVICE.May 28, 2020 · N1409A · Boeing 767306SDR UIEA2020052901150Warning System · false activationAPU FAULT DURING APU START. PERFORMED APU BITE TEST IAW FIM 49-11 FT 958, FOUND FAULT 34, CLEARED. PERFORMED OPERATIONAL TEST, OK IAW AMM 49-11-00.May 28, 2020 · N649GT · Boeing 767375SDR ASAA2020051732740Warning System · false activationCSS FAILED FL 400 (3 ATTEMPTS), FAULT LIGHT ILLUMINATED. GROUNDED - YES. FOUND FAULT 49-31016 OVERTEMP SHUTDOWN. IAW FIM TASK 49-30 TASK 803, STARTED APU NO FAULTS NOTED. APU COLD SOAK START ACCOMPLISHED, SUCCESSFUL.May 17, 2020 · N487AS · Boeing 737990ERSDR UIEA2020050400940Warning System · false activationAPU FAULT ON LANDING.(<P>FOLLOWED FAULT TREE FIM 49-11 FT 987 - FOR APU ECU BITE - NO DATA DISPLAYED.</P><P>APU OPERATING NORMALLY AT THIS TIME IAW AMM 49-11-00.</P>)May 3, 2020 · N645GT · Boeing 767324SDR UIEA2020042900914Warning System · false activationAPU FAULT (<P>BEGAN APU BITE PROCEDURE. PERFORMED TWO SUCCESSFUL STARTS DURING OPS CHECK IAW AMM 49-11-00. OPS CHECK WAS GOOD.</P>)Apr 28, 2020 · N1427A · Boeing 767306SDR UIEA2020042800882Warning System · false activationSTARTED APU AFTER LANDING. IT WAS RUNNING WHEN WE BLOCKED IN. WHEN WE SHUTDOWN ENGINES APU FAULT CAME ON AND APU SHUTDOWN.(<P>INTERROGATED BPCU, NO FAULT FOUND. APU OPS CHECK NORMAL AT THE PRESENT TIME IAW 49-11-00.</P>)Apr 28, 2020 · N1373A · Boeing 76731KSDR UIEA2020042800880Warning System · false activationAPU FAULT EICAS.(<P>PERFORMED BITE ON APU MODULE AND FOUND NO FAULTS ON LRU OR PREVIOUS FAULT HISTORY IAW B767 AMM 49-61-05. RAN APU AND APPLIED ELECTRIC LOAD AND OBSERVED NO ABNORMAL ACTIVITY. OPS CHECK GOOD.</P>)Apr 27, 2020 · N1373A · Boeing 76731KSDR UIEA2020042700842Warning System · false activationAPU BLEED VALVE MESSAGE DISPLAYED.(<P>PERFORMED PNEUMATIC SYSTEM TEST IAW AMM 49-11-00. SYSTEM TEST OK.</P>)Apr 26, 2020 · N1499A · Boeing 767328SDR UIEA2020042800837Warning System · false activationAPU FAULT ON LANDING.(<P>PERFORMED APU BITE PER FIM 49-11 FT 987, NO FAULTS NOTED AT THIS TIME. OPS CHECK GOOD PER B767 AMM 49-11-00.</P>)Apr 25, 2020 · N645GT · Boeing 767324SDR UIEA2020041600756Unknown · malfunctionedAPU FAULT ON ARRIVAL(<P>PERFORM APU BITE TEST REF AMM 49-61-05-742-027. NO FAULTS NOTED AT THIS TIME.</P>)Apr 16, 2020 · N1373A · Boeing 76731KSDR UIEA2020032300534Unknown · malfunctionedAPU FAULT EICAS MSG, 2ND ATTEMPT UNSUCCESSFUL, APU FAULT ON THE 2ND ATTEMPT.(<P>TRANSFERRED TO MDDR 126159, CAT C, PER DDG 49-11-01A, CAT C DUE 02APR20.</P><P>LOG PAGE 1071564: PERFORMED BITE ON APU ECU I.A.W 49-61-05. NO FAULTS FOUND. ALSO PERFORMED 3 OPS CHEMar 23, 2020 · N1373A · Boeing 76731KSDR UIEA2020032300533Warning System · false activationAPU FAULT(<P>PERFORMED APU ECU BITE CHECK IAW B767 FIM 49-11 FT 958, SYSTEM FAULTED PT SENSOR MINI FLAG 14. RESET, CLEARED. NO REPEAT, SYSTEM OPERATES NORMAL. NO FURTHER DEFECTS NOTED UPON INSPECTION.</P>)Mar 23, 2020 · N1373A · Boeing 76731KSDR UIEA2020032000501Warning System · false activationAPU FAULT EICAS MESSAGE AFTER LANDING, TWO START ATTEMPTS MADE.(<P>3RD ATTEMPT START SUCCESSFUL. PERFORMED BITE CHECK OF ECU, NO FAULTS FOUND I.A.W AMM 49-11-00. OPS CHECK GOOD.</P>)Mar 19, 2020 · N1373A · Boeing 76731KSDR UIEA2020031900493Warning System · false activationAPU FAULT AFTER TAXI TO GATE.(<P>PERFORMED APU START I/A/W AMM 49-11-00. NO DEFECTS NOTED, OPS CHECK NORMAL.<BR /></P>)Mar 17, 2020 · N1487A · Boeing 76731KSDR UIEA2020031100430Warning System · false activationAPU FAULT, SECOND ATTEMPT SUCCESSFUL.(<P>PERFORMED APU ECU BITE PROCEDURE IAW AMM 49-61-05, NO FAULTS FOUND. ALL TESTS CHECK OK. PERFORMED APU OPERATIONAL CHECK IAW AMM 49-11-00, OPS CHECK GOOD AT THIS TIME.</P>)Mar 11, 2020 · N1373A · Boeing 76731KSDR ASAA2020030932387Warning System · false activationAPU "FAULT" LIGHT ILLUMINATED AT APU START PER QRH ATTEMPTED 2ND START AFTER FAULT LIGHT EXTINGUISHED 2ND STARTED SUCCESSFUL. GROUNDED - YES. PERFORMED APU BITE TEST FOUND FAULT 49-41010. STARTED APU AND FAULT LIGHT REMAINED EXTINGUISH. CSS APU PASSED.Mar 6, 2020 · N462AS · Boeing 737990ERSDR ASAA2020030232300Sensor · malfunctionedAPU AUTO SHUT DOWN, TWO ATTEMPTS. HAS HISTORY GROUNDED - YES. TURN APU MASTER SWITCH ON DO NOT START ACCESS APU SHUTDOWN DATA FROM THE APU PAGE ON MCDU AND UPDATE TROUBLESHOOTING TO ORDER PARTS.APU SHUTDOWN IS NOT BEING REPORTED TO PTMD R&R APU SPEED SENSOR, AFeb 26, 2020 · N286VA · Airbus A320214SDR ASAA2020021863200Fault Light · false activationAPU FAULT LT ILLUMINATED ON 1ST ATTEMPT AT 340 APU FAULT LT ILLUMINATED ON 2ND ATTEMPT AT 360 3RD ATTEMP AT 340 - PASSED. GROUNDED - YES. APU BITE SHOWS MAINT MSG 49-41010 IN HISTORY, APU OPS CHECK GOOD ON GROUND.Feb 16, 2020 · N402AS · Boeing 737990ERSDR ASAA2020021843201Fault Light · false activationAPU FAULT ILLUMINATED WHEN ATTEMPTING START AFTER LANDING 2ND TRY SUCCESSFUL. GROUNDED - YES. APU STARTS NORMAL NO FAULTS NOTED.Feb 14, 2020 · N462AS · Boeing 737990ERSDR ASAA2020010931788Warning System · false activationUPON LANDING AND STARTING APU, "FAULT" LIGHT ILLUMINATED. GROUNDED - YES. UPON ARRIVING TO AIRCRAFT, STARTED APU FOUR TIMES, ALL FOUR STARTS WERE NORMAL. REF B737-900 FIM 49-60 TASK 801 FOUND "MAINT MSG 49-41010" IN FAULT HISTORY JAN05. CURRENT STATUS SHOW'S "Jan 5, 2020 · N462AS · Boeing 737990ERSDR UIEA2019112535950Warning Message · false activationAPU FAULT.(<P>PERFORMED BITE CHECK OF THE APU IAW FIM 49-11 FT 987, MESSAGE CLEARED.</P>)Nov 23, 2019 · N1487A · Boeing 76731KSDR ASAA2019103081176Module · faultedAPU CSS FAILED FL350, FL350 AND FL310. APU FAULT LIGHT ILLUMINATED. APU OPERATES NORMALLY ON THE GROUND. GROUNDED - YES. PREFORMED APU BITE FOUND FAULT MSG 49-72104 DMM MODULE FAULT, PREFORMED APU START ON GND PER B737-900 AMM 49-11-00 APU START NORMAL, NO FAUOct 28, 2019 · N419AS · Boeing 737990ERSDR HALA2019092400384Sensor · malfunctionedETOPS SIGNIFICANT SYSTEM - APU FAULT AUTO SHUTDOWN ON TAXI IN. REMOVED AND REPLACED APU HIGH OIL TEMP SENSOR PER AMM 49-94-13. OPS CHECK LEAK CHECK OK.Sep 24, 2019 · N360HA · Airbus A330243SDR UIEA2019092505573Warning System · false activationMAINT MSG, APU DOOR. IMPROPER APU SHUTDOWN. CLOSED APU DOOR, APU START NORMAL IAW AMM 49-11-00.Sep 24, 2019 · N1321A · Boeing 767306SDR ASAA2019092130776Warning System · false activationFAULT LIGHT ILLUMINATED DURING APU START ATTEMPT AT FL 340. GROUNDED - YES. ACCOMPLISHED FIM 49-30 TASK 804 INITIAL EVAL PASS. MSG 49-31018 WAS SHOWING BEFORE ACCOMPLISHING THE FIM TASK. AFTER APU START AND SHUTDOWN, NO MSG WAS SHOWING FOR THE LAST APU CYCLE. Sep 21, 2019 · N472AS · Boeing 737990ERSDR UIEA2019091605513Warning System · false activationEICAS MSG: APU FAULT. PERFORMED BITE OF APU ECU, NO FAULTS FOUND. OPS CHECK GOOD REF AMM 49-61-05.Sep 15, 2019 · N1487A · Boeing 76731KSDR HNAA2019091300268Warning System · false activationPDIS 624 49-10 1881591 12SEP19 PHL CLOSE APU FAIL MESSAGE ON EICAS. 28876 00 MDC FACT 12SEP19 19:23 PHL PERFORMED ELECTRICAL RESET, OPERATED APU FOR 30 MINS WITH BOTH PACKS ON. OPS NORMAL, OK FOR SERVICE.Sep 12, 2019 · N624AE · Emb EMB145LRSDR UIEA2019090905473Warning System · false activationAPU FAULT MESSAGE ON LOWER EICAS. PERFORMED APU CONTROL UNIT BITE TEST IAW AMM 49-61-05 - FAULT NO LONGER PRESENT. PERFORMED APU START IAW AMM 49-11-00 NO FAULTS NOTED. NOTE: PER MCC REQUEST - AN APU COLD SOAK START VERIFICATION DEFERRAL WAS OPENED (MDDR 11752Sep 9, 2019 · N1619A · Boeing 7673Y0SDR UIEA2019090705455Warning System · false activationAPU FAULT, 3RD ATTEMPT AT 17:23Z. CLEARED FAULT. OPS CHECK COMPLIED WITH, APU START IAW 49-60-00.Sep 7, 2019 · N645GT · Boeing 767324SDR UIEA2019083105418Unknown · malfunctionedAPU FAULT X3. PERFORMED APU/ECU BITE CHECK PER FIM 49-11-00. NO FAULTS FOUND AT THIS TIME.Aug 31, 2019 · N1499A · Boeing 767328SDR ASAA2019072930233Status Message · false activationFOUND APU CURRENT STATUS MESSAGE 49-94304. NO APU START FAULTS FOUND. APU STARTED AND RAN NORMALLY. GROUNDED - YES. PER FIM 49-90 TASK 811 INITIAL EVALUATION FAULT NO LONGER SHOWS IN CURRENT STATUS AND IS CONSIDERED INTERMITTENT. NO MAINT ACTION REQUIRED.Jul 29, 2019 · N566AS · Boeing 737890SDR ASAA2019072830232Sensor · corrodedAPU TREND DATA SHOWS CT5ATP TEMP IS AT OR ABOVE THE THRESHOLD 605 DEGREES GROUNDED - YES. NO RECENT RELATED MTX MESSAGES IN APU HISTORY. NO BLOCKAGE IN AIR INLET OR COMPRESSOR INLET PLENUM. REMOVED INLET TEMP SENSOR & FOUND IT TO BE CORRODED & DIRTY. CLEANED CJul 28, 2019 · N596AS · Boeing 737890SDR UIEA2019071904794Warning System · false activationAPU FAULT EICAS MESSAGE. (<P>PERFORMED ECU BITE IAW AMM 49-61-05, NO FAULTS NOTED. TEST OK, APU START 2ND ATTEMPT. PILOT WAS 1ST ATTEMPT.<BR /></P>)Jul 19, 2019 · N1487A · Boeing 76731K
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