JASC 4940

Service difficulty reports · 1,425

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 DL76L040919Battery · overheatedAPU BATTERY OVERHEATED ON GROUND. SMELL IN CABIN OCCURRED DURING TRANSIT. REPLACED BATTERY.Sep 25, 2004 · N187DN · Boeing 767332SDR DLM90040640Starter · burnedFIVE MINUTES AFTER FAILED START ATTEMPT SMOKE COMING FROM APU AREA. SMALL FIRE AT APU STARTER EXTINGUISHED WITH DRY CHEM EXT. APU REPLACEMENT IN PROGRESS. REPLACED APU ASSY AND APU START RELAY.Jul 9, 2004 · N909DA · Doug MD9030SDR DL76S040472Ecu · malfunctionedMCO - APU STARTER CONTINUOUSLY POWERED CAUSING OVERHEATING AND SMELL IN APU AIR. REPLACED ECU AND K117 CONTACTOR.May 27, 2004 · N122DL · Boeing 767332SDR 2004F00150Ignition Unit · shortedPRIOR TO DEPARTURE SNN APU DID NOT START, FAULT LIGHT COMES ON DURING CYCLE. TRANSFERRED ITEM TO DMI LOG ITEM NR 4360. AIRCRAFT CONTINUED TO SREVIE ONE LEG TO STN. PERFORMED APU BITE CHECK IAW FIM 49-40 TASK 801-802. REPLACED IGNITION UNIT IAW MM 49-41-31.Apr 19, 2004 · N733MA · Boeing 7378Q8SDR DLM88040263Starter · failedELECTRICAL ODOR THROUGHOUT AIRCRAFT. REPLACED APU.Mar 24, 2004 · N971DL · Doug MD88SDR PCAA0403182Control Panel · smokeREPORTED A PUFF OF SMOKE FROM THE AUXILLARY POWER UNIT CONTROL PANEL WHEN THE GENERATOR SWITCH WAS SELECTED ON.MAINTENANCE CONFIRMED THAT THE CONTROL PANEL WAS AT FAULT AND DISCONNECTED THE PANEL CONNECTOR, ISOLATED THE UNIT, AND COMPLIED WITH MEL PROCEDURES UMar 15, 2004 · N814EX · Dhav DHC8102SDR 2003FA0001293Switch · erraticUPON SHUT DOWN OF APU AFTER ENGINE STARTS, AS THE APU SLOWED TO APPROX. 5 PERCENT THE APU STARTED ITSELF WITHOUT ANY INPUT FROM THE CONTROL PANEL. SUBSEQUENT SHUTDOWN ATTEMPTS RESULTED IN THE SAME RESULTS UNTIL THE FIFTH TIME, AT WHICH, THE MASTER SWITCH WAS Dec 30, 2003 · N916CS · Cessna 560XLSDR CA031209004Pressure Switch · cracked(CAN) ON TAXI IN FROM THE LAST FLIGHT OF THE DAY, THE CREW NOTICED THE OIL PRESSURE LIGHT ILLUMINATED. THE GAUGE CONFIRMED THE INDICATION. THE CREW SHUT THE ENGINE DOWN. ON ARRIVAL AT THE RAMP, A SUBSTANTIAL AMOUNT OF OIL WAS FOUND LEAKING FROM THE COWL. MAIDec 8, 2003 · Swrngn SA226ATSDR DLM88031038Relay · failedJUST PRIOR TO DEPARTURE, SMOKE COMING FROM APU COMPARTMENT. FOUND APU STARTER ON FIRE. DISCHARGED BOTH ENG/APU FIRE BOTTLES. REPLACED APU.Nov 20, 2003 · N968DL · Doug MD88SDR PAZ2003F00000Relay · burnedDURING MAINTENANCE GROUND RUN, ATTEMPTED TO START APU. APU DID NOT START. ON NEXT ATTEMPT TO START, APU DID NOT START AND START RELAY WOULD NOT DISENGAGE. BEFORE POWER COULD BE SHUT OFF BY DISCONNECTING SHIPS BATTERIES, NOTICED SMOKE COMING FROM APU J-BOX. Oct 7, 2003 · N72ST · Cessna 650SDR ASAA0380556Starter · failedPDX - NOTICED SMOKE COMING FROM APU COMPARTMENT. OPENED COMPARTMENT LEFT DOOR AND OBSERVED FLAMES. ACTIVATED BOTH NR 1 AND NR 2 FIRE BOTTLES. SUBMITTERS STATES, THERE WAS DEFINITELY SMOKE, BUT WHETHER THERE WERE ACTUALLY FLAMES IS SOMEWHAT PROBLEMATIC. ENGJul 18, 2003 · N935AS · Doug DC982SDR HALA0300285Starter · failedETOPS SIGNIFICANT SYSTEM, APU FAULT LIGHT ON, NO ROTATION, NO EGT RISE. REPLACED STARTER PER MM 49-41-06 AND REPLACED STARTER CLUTCH PER MM 49-41-01. OPS AND LEAK CHECK OK. (M)Apr 25, 2003 · N585HA · Boeing 767300SDR TX22003F00000Starter · failedNPRM STATES TO REMOVE PART NUMBERS AND SERIES NUMBER AND REPLACE THESE ITEMS WITH A SERIES 7 OR GREATER. THE SERIES 7 UNIT WHEN INSTALLED FAILED. WHEN AN APU START WAS ATTEMPTED USING A SERIES 7 START CONVERTER UNIT. THE NEW UNIT EXPERIENCED A COMPLETE ELECApr 15, 2003 · N108MS · Boeing 737100SDR DLM90030245Relay · failedCREW REPORTS THAT AFTER BLOCK IN THE RAMP REPORTED HEAVY SMOKE/ELECTRIC ODOR EMINATING FROM THE APU. REPLACED STARTER AND START RELAY FOR SLOW SPOOL.Mar 15, 2003 · N915DN · Doug MD9030SDR AUS20020895Starter · failed(AUS) APU FAILED TO START. STARTING SYSTEM INOPERATIVE.Aug 12, 2002 · Boeing 737800*SDR UVVR200200001Gasket · failed"AFT FUSELAGE HOT" LIGHT CAME ON IN FLIGHT. CREW MADE LANDING AT SUS. AVMATS TROUBLESHOT PROBLEM, FOUND APU START BYPASS VALVE GASKET BLOWN - CAUSING HOT BLEED AIR TO TRIP THERMAL SWITCH, ILLUMATING WARNING LIGHT. REMOVED AND REPLACED GASKET WITH NEW GASKET.Aug 5, 2002 · N65AK · Rkwell NA26565SDR SWIA200211049Ecu · faultyDURING START OF APU, APU HANGS AT 9 PERCENT. STARTED ON FOURTH ATTEMPT WHICH RESULTED IN FIRE IN THE TAILPIPE, CAUSING DELAMINATION TO THE LOWER SIDE OF RIGHT ENGINE PYLON. REMOVED AND REPLACED APU IAW MM 49-10-00 DUE TO HIGH EGT & METAL ON CHIP DETECTOR. AJul 10, 2002 · N411SW · Cndair CL6002B19SDR 2002F00466Exciter · failedFLIGHT NUMBER 126, DURING CRUISE APU FAILED TO START DURING INFLIGHT START VERIFICATION (5 ATTEMPTS). MAINTENANCE TROUBLESHOT PER FIM 49-11-00 TO FAULTY EXCITER UNIT. REMOVED AND REPLACED IGNITION EXCITER IN ACCORDANCE WITH MM 49-41-03. APU OPERATIONAL CHECMay 6, 2002 · N519AT · Boeing 75723NSDR AXI2002F00002Shaft · brokenSTARTER GENERATOR SPLINE SHAFT (PN 36B50419G1) INSTALLED IN STARTER GENERATOR (PN 2CM308C3) SHEARED AT THE BASE OF THE INTERNAL SPLINE AFTER ABOUT 30 START CYCLES. IT IS OUR OPINION THAT THE HOLE, WHICH IS DRILLED AND TAPED TO ACCEPT THE RETAINING SCREW IS BEMar 15, 2002 · N1881Q · Amd FALCON20SDR AXI2002F00001Shaft · brokenGENERAL ELECTRIC STARTER GENERATOR (PN 2CM308C3) WAS INSTALLED ON OUR APU ON 10/30/01 WITH A NEW SPLINE SHAFT SHEARED AT THE BASE OF THE INTERNAL SPLINE AFTER ABOUT 50 START CYCLES. IT IS OUR OPINION THAT THE HOLE, WHICH IS DRILLED AND TAPED TO ACCEPT THE RETMar 15, 2002 · N1881Q · Amd FALCON20SDR SWIA200210683Potentiometer · malfunctionedAPU AUTO SHUTDOWN ON THE INITIATION OF TAKEOFF ROLL. ABORTED TAKEOFF AND TAXIED AIRCRAFT BACK TO THE GATE. FOUND APU DOOR POTENTIOMETER BAD. INSTALLED NEW POTENTIOMETER IAW 49-14-01. RIGGED DOOR AND RAN APU. ALL CHECKS OK AT THIS TIME.Feb 28, 2002 · N913SW · Cndair CL6002B19SDR CA020607017Starter · failed(CAN) THIS APU HAS HAD TWO OCCURRENCES OF THE STARTER DRIVE SHAFT SHEARING. THE AIRCRAFT WAS INSPECTED DURING C CHECK IN REGARDS TO THESE SNAGS WITH NO FAULTS. THE APU STARTER DRIVE TRAIN HAS HAD NO FAULTS SINCE.Feb 2, 2002 · Fokker F28MK1000SDR CA020201019Apu · failed(CAN) AT 10,000 FT TRIED TO START THE APU, NO LIGHT OFF. APU SELECTED OFF. 2 MINUTES LATER, ATTEMPTED ANOTHER START, START COMPLETED, FUEL TRANSFERRED WITH STRONG SMELL OF FUEL, EGT HIGHER THAN NORMAL WITH ONE FIRE DETECTOR LOOP INOP. APU SHUTDOWN AND FJan 6, 2002 · Cndair CL6002B19SDR 0104625507Starter · defectiveWHILE AT THE GATE, STRONG BURNING SMELL/ODOR BEGAN TO ENTER THE COCKPIT AND CABIN. PASSENGERS WERE DEPLANED THROUGH THE JETWAY. MAINTENANCE FOUND THE APU STARTER EMITTING BURNING ODOR CONTAMINATING APU BLEED AIR. APU STARTER REPLACED.Nov 26, 2001 · N507US · Boeing 757251SDR AUS20011065Motor · faulty(AUS) APU STARTER FAULTY.Oct 10, 2001 · Boeing 767238SDR AUS20011027Starter · burned out(AUS) APU STARTER MOTOR BURNED OUT. STARTER MOTOR HAD REMAINED ENGAGED FOLLOWING APU START.Sep 27, 2001 · Boeing 767238SDR AUS20011003Starter · disconnected(AUS) APU FIRE. FIRE BOTTLE DISCHARGED. INVESTIGATION FOUND THAT THE STARTER HAD DISCONNECTED FROM THE GEARBOX AND THE SPRAG CLUTCH WAS LYING IN THE COWLS.Sep 16, 2001 · Boeing 747438SDR 2001UALA01752Pressure Switch · defectiveAPU NO START WITH 3 ATTEMPTS APU FAULT EICAS. REPLACED STARTER REF MM49-41-01 AND ECU REF MM 49-61-05. NO HELP. APU STILL WOULD NOT START. ECU SHOWED NR 1 SPEED SENSOR. REPLACED APU BATTERY AND NR 1 MONOPOLE RUNS FOR APPROX 15 MIN THEN SHUTS DOWN. REPLACED ANAug 17, 2001 · N667UA · Boeing 767322SDR 2001F00247Starter · failedPTK - FLT 2164 - APU INOPERATIVE. APU STARTER FAILURE. REMOVED AND REPLACED STARTER WITH OVERHAULED UNIT. (M)Aug 1, 2001 · N940DC · Gulstm GIVSDR DLM90011069Starter · malfunctionedON APU START ATTEMPT AT THE GATE IN SNA. SMOKE WAS OBSERVED COMING FROM APU COMPARTMENT. MTC OPENED COMPT AND OBSERVED THE STARTER GLOWING RED. FIRE DEPT DISCHARGED HALON INTO COMPT. CTC MTC ADVISED THERE WERE FLAMES INITIALLY WHEN DOOR WAS OPENED. REPLACJun 26, 2001 · N904DA · Doug MD9030SDR 0101269983Apu · fireDURING APU MAINTENANCE BETWEEN FLIGHTS, AN APU COMPARTMENT FIRE WAS REPORTED. NR 1 AIRCRAFT FIRE BOTTLE WAS DISCHARGED AND THE FIRE WAS EXTINGUISHED. MAINTENANCE REMOVED THE APU AND INSPECTED APU COMPARTMENT FINDING NO DAMAGE. REPLACED THE APU AND NR 1 FIRE Mar 29, 2001 · N983US · Doug DC932SDR 20010517CW008Apu · malfunctionedINTERRUPTION TO A FLIGHT, UPON ARRIVAL , START ATTEMPT OF APU AFTER FIRST ATTEMPT FAILED TO LIGHT, CAUSED A FIRE IN EXHAUST PIPE. APU FIRE BOTTLE WAS EXPENDED, FIRE EXTINGUISHED, FIRE DEPARTMENT SPRAYED PKP WHICH REQUIRED INSPECTION AND APU AND APU FIRE BOTTFeb 21, 2001 · N800TG · Hwksly BH125400ASDR CA010222011Bracket · damaged(CAN) DURING TROUBLESHOOTING FOR APU FAILED START, THE GROUND CABLE FROM APU SHUNT WAS FOUND SEPARATED FROM 4900-GS10 (STN X792) ON BRACKET. THE ATTACHMENT BRACKET WAS FOUND BURNT AS WELL AS THE CABLE CONNECTION. SYD WAS ISSUED AND THE CABLE WAS REPAIRED AND Feb 6, 2001 · Dhav DHC8*SDR DL757002509Starter · unserviceableFOUND APU STARTER WIRES ARCING WITH NO PWR. APPLIED. STARTERNOT TURNING CAUSING CABLE TO BURN THROUGH STARTER. FOUND APU CONTACTOR BAD ALSO._C/A REPLACED CONTACTORDec 23, 2000 · N651DL · Boeing 757232SDR C2XAOOIA395Contactor · burnedIAH-CREW REPORTED SMOKE IN COCKPIT AFTER ATTEMPTING TO START THE APU, A/C LANDED AT IAH WITHOUT INCIDENT. MX INSPECTED THE A/C AND FOUND THE APU START CONTACTOR TO HAVE A MELTED LUG AND HEAT DAMAGE TO THE BUSS BAR AND LINE CONTACTOR. MX REMOVED/REPLACED THE AFOct 30, 2000 · N14939 · Emb EMB145SDR CA000804004Starter · failed(CAN) APU FAILED TO START. FUEL LEAK AND SMALL AMOUNT OF SMOKE DETECTED AT THE REAR OF THE AIRCRAFT. APU EXTINGUISHER ACTIVATED. APU STARTER REPLACED DUE TO HEAT DAMAGE. CURRENT LIMITERS REPLACED IN CARGO BAY P/N ANL-275. IGNITOR AND COMBUSTION CHAMGER CLEANEDJul 27, 2000 · Bag BAE146200ASDR SWAA001108Connector · burnedDURING SCHEDULED RON WHILE TROUBLESHOOTING APU INOP, FOUND APU START CONVERTER CONNECTOR D11114B BUNRNED. MX FERRIED ACFT TO DALLAS FOR REPAIR AND FOUND APU STARTER CONVERTER BOX CENTER MALE END CONNECTOR PARTIALLY BURNED, FEMALE CONNECTOR AT RACK ASSY TOTALJun 17, 2000 · N754SW · Boeing 7377H4SDR 2000UALA00240Start Button · failedCHRONIC PROBLEMS WITH APU STARTING. REMOVED AIRCRAFT FROM ETOPS. *S/D* EXTENSIVE TROUBLESHOOTING WAS ACCOMPLISHED. MANY PARTS WERE REPLACED AND THE PROBLEM WAS INTERMITTENT APU FAILURE TO START. ON MAY 5TH, APU ENGR AND TAIL NUMBER TRACKER MET THE ACFT INMay 9, 2000 · N670UA · Boeing 767322SDR 2000UALA00099Relay · defectiveAPU FAILED TO START IN FLIGHT. DIVERTED TO MCI. *S/D* REPLACED START CONTACTOR AS PER MM. CLEARED ALL FAULTS AND APU OPERATION CKS GOOD WITH ALL ELEC AND PNEU. REPLACE THE APU FUEL CONTROL DUE TO OVER SPEED CONDITION.Feb 27, 2000 · N613UA · Boeing 767222SDR 99UAL900494Starter · defectiveAPU AUTO SHUTDOWN WITH 'APU OIL QTY' EICAS MSG DISPLAYED. DIVERTED TO ASU . *S/D* APU STARTER WAS FOUND LEAKING WHICH CAUSED THE LOP SHUTDOWN. REPLACED APU STARTER PER ENGINEER'S UPDATE. ALSO, REPLACED GEARBOX SHUTOFF VALVE AS A PRECAUTIONARY ACTION. SERSep 27, 1999 · N652UA · Boeing 767322SDR DL76S992002Starter · failedAPU INOP, WILL NOT START. FOUND APU STARTER OVERHEATED AND BURNED ON OUTER CASE. REPLACED STARTER, APU OPS NORMAL.Sep 8, 1999 · N130DL · Boeing 767332SDR 99UAL900297Starter · defectiveDIVERTED TO SLC DUE TO AN APU OIL LEAK. NR 1 GENERATOR WAS PREVIOUSLY DEFERRED. UPON OPENING APU COWLING FOUND A LARGE AMOUNT OF OIL INSIDE. *S/D* FOUND OIL LEAKING THRU STARTER MOTOR. REPLACED STARTER MOTOR WITH UPGRADED DASH 7. ALSO, REPLACED GEARBOX SMay 28, 1999 · N602UA · Boeing 767222SDR 99UAL900209Exciter · malfunctionedRETURNED TO THE FIELD AT SFO DUE TO THE LOSS OF THE NR 1 IDG AND THE INABILITY TO START THE APU. *S/D* APU EXCITER WAS REPLACED. FLIGHT CREW SUCCESSFULLY OPERATED APU AT FL 370. SHOP TESTED EXCITER AND NO DISCREPANCIES WERE FOUND. THERE IS THE POSSIBILITYApr 13, 1999 · N517UA · Boeing 757222SDR QXEA9900464Innitor · inoperativeBIL - DURING LANDING ROLL, BIL TOWER REPORTED FLAMES COMING FROM APU EXHAUST. FIRST OFFICER NOTICED APU TGT 650 DEGRESS AND INCREASING. SHUT DOWN APU. MX DEFERED THE APU. THE FOLLOWING DAY GEG MX GROUND RAN, FOUND AFTER APU WARMED UP IT HAD LOW OIL PRESSURMar 5, 1999 · N478US · Fokker F28MK4000SDR 99UAL900507Relay · defectiveHIGH ALTITUDE START OF APU UNSUCCESSFUL X3. *S/D* APU IN THE SHOP WAITING FOR FINDINGS. APU WILL BE TESTED IN TEST CELL AS RECEIVED, TO VERIFY IF THERE IS A DEFECTIVE COMPONENT. DUE TO MANY APU BATTERY AND CHARGER PROBLEMS, IT IS SUSPECTED THAT THE BATTERYJan 30, 1999 · N668UA · Boeing 767322SDR 99UAL900046Bearing · failedJUST AFTER LEVEL OFF THE RIGHT BACK-UP GENERATOR FAILED. CREW ATTEMPTED TO START APU AND APU FAILED. CREW ELECTED TO RETURN TO MIA. *S/D* APU FAILED TO LIGHT AT 33,000 FT WITH FAULT LIGHT INDICATION ON 17 JAN, 1999. MIA MAINTENANCE REPORTED APUC LATCHED FJan 16, 1999 · N784UA · Boeing 777222SDR TWAA9820002Excitor · shortedTHE LT CSD TEMP WAS HIGH AND CREW DISCONNECTED THE CSD. ATTEMPTED TO START APU FOR GENERATOR BUT APU WOULD NOT START. CORRECTED THE APU BY REPLACING THE OIL PRESS SEQUENCE SWITCH, MFG 692525-9, THE IGNITION COIL, MFG 10-381175-9, AND THE IGNITOR PLUG MFG CH31Dec 22, 1998 · N959U · Doug DC982SDR 98UAL900543Starter · malfunctionedAPU WILL NOT START IN EITHER ELECTRICAL OR PNEUMATIC START MODE. *S/D* REMOVED AND REPLACED APU BATTERY CHARGER. PROBLEM PERSISTED. FOUND APU STARTER DAMAGED. REPLACED ELECTRIC STARTER (P/N 2704442-4) AND CLUTCH ASSEMBLY. OPERATIONALLY CHECKED NORMAL. SUSNov 14, 1998 · N772UA · Boeing 777222SDR G60A017Pawl · wornIN THE PROCESS OF TROUBLESHOOTING, APU STARTING FAULT. THE PAWLS OF THE STARTER ADAPTER WERE FOUND TO BE WORN. PARTS WERE ORDERED IDENTIFIED BY P/N FORM DC-10 IPC 49-44-01 ITEM 80. WHEN THE PARTS WERE RECEIVED THERE WAS ONLY AND ADAPTER WITHOUT THE PAWL. WJan 7, 1998 · N602GC · Doug DC1030FSDR ORJA97223Starter · failedRNO - APU FIRE, NR 1 FIRE BOTTLE WAS DISCHARGED WHICH EXTINGUISHED THE APU FIRE. MAINTENANCE FOUND THE APU STARTER TO BE THE SOURCE OF THE FIRE. THE FIRE DAMAGED THE APU STARTER LEADS. MAINTENANCE DEFERRED THE APU AND REPLACED NR 1 ENGINE FIRE BOTTLE. THE Dec 29, 1997 · N843RA · Doug DC982
Back to JASC 4940