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.
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
Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
SDR WTAA970220Starter Gen · failedFAT - SMOKE REPORTED IN CABIN AFTER APU SHUTDOWN. MAINTENANCE DEFERRED APU PER MEL 49-00-1. AIRCRAFT RETURNED TO SERVICE. MAINTENANCE SUBSEQUENTLY CLEARED DEFERRAL BY REPLACING APU STARTER GENERATOR. OPERATIONAL CHECK SATISFACTORY. (X)SDR 9721850982Exciter Box · failedWHILE CLIMBING THROUGH FL280, THE RIGHT CSD OIL TEMPERATURE BOTH OUT AND RISE, WENT OFF SCALE HIGH. THE CSD WAS DISCONNECTED SUCCESSFULLY. SEVERAL UNSUCCESSFUL ATTEMPTS WERE MADE TO START THE APU. THE COM PROCEDURES WERE FOLLOWED AND THE AIRCRAFT RETURNED TSDR 97UAL900683Starter · failedAPU WOULD NOT START. *S/D* REPLACED STARTER PER MM 49-41-01, OPS CHECKED GOOD.SDR 97UAL900668Exciter · inoperativeAPU START PROBLEM, PRESSURE GOES TO ZERO ON ENGINE START, APU INOP. *S/D* FAULTY IGNITION EXCITER. REPLACED IGNITION UNIT.SDR CALA9701225Starter · inoperativeWHILE OPERATING THE APU WITH THE NR 2 GENERATOR PLACARDED INOPERATIVE, THE APU SHUTDOWN CLIMBING THROUGH 3,000 FEET. RESTART ATTEMPT WAS UNSUCCESSFUL. THE AIRCRAFT WAS DIVERTED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT TO A FAILED STASDR 97UAL900547Battery · failedAPU WILL NOT START. BATTERY VOLTAGE DROPS TO 15 VOLTS DURING OPERATIONAL CHECK. *S/D* APU BATTERY FAILED. REPLACED BATTERY.SDR 97UAL900499Circuit Breaker · trippedAPU WOULD NOT START AT DEN. FOUND C1391 CIRCUIT BREAKER POPPED. RESET CIRCUIT BREAKER AND ACCOMPLISHED FIVE NORMAL STARTS, OPERATIONS CHECK NORMAL.SDR 97ZZZX2717Diode Board · failedHOOKED UP APU AND STARTER IMMEDIATELY CRANKED ENGINE. INVESTIGATION FOUND BOARD CONTAINING DIODES IN CABIN NEXT TO POWER RELAY TO HAVE BOTH DIODES INOPERATIVE. PART IS IN DIFFICULT LOCATION TO TEST INDIVIDUAL DIODES. REPLACED DIODE BOARD P/N 1570043-1 AND SDR 97UAL900391Start Syst · malfunctionedUNABLE TO START APU AT ARRIVAL. *S/D* RAN APU, OPERATIONS CHECK NORMAL. AN OIL QUANTITY INDICATION SYSTEM FALSE MESSAGE IS SOMETIMES REPORTED AND IS SUSPECT IN THIS DISCREPANCY. THIS CAN RESULT FROM SERVICING THE APU OIL WHEN IT IS RUNNING. NO OTHER INCIDSDR ASAA9780074Start Relay · stuckSEA - DURING MAINTENANCE CHECK AND RUNUP OF THE AUXILIARY POWER UNIT (APU), SMOKE AND FIRE WAS NOTED IN THE APU COMPARTMENT AREA. SHUT DOWN THE APU AND DISCHARGED BOTH AIRCRAFT FIRE BOTTLES AND USED A PORTABLE GROUND FIRE EXTINGUISHER TO EXTINGUISH THE FIRE. SDR CA970401006Starter Relay · failed(CAN) APU CAUTION LIGHT AND APU STARTER LIGHT ON IN CRUISE AFTER DEPARTURE. AIRCRAFT RETURNED TO BASE. K62 STARTER RELAY FOR APU STARTER FOUND FAILED.SDR 97UAL900203Gear · failedAPU WILL NOT START. BATTERY REPLACED FOR LOW VOLTAGE AND STARTER REPLACED. STILL NO START. FOUND STARTER GEAR (P/N 3860823-1) WORN AND ELECTRIC CLUTCH PACK DAMAGED. ADDITIONAL, DAMAGE FOUND IN AREA OF CLUTCH HOUSING DURING CLUTCH REMOVAL RESULTED IN APU RESDR P5CA9600459Battery Compt · bentOUTBOARD FLANGE BENT APU BATTERY COMPARTMENT. REPAIRED PER BOEING SRM 51-30-02 AND 51-10-01.SDR CALA9601065Ignition Syst · inoperativeTHE APU SHUT DOWN WHILE EN ROUTE TO EWR. A RESTART ATTEMPT WAS UNSUCCESSFUL. THE APU COMBUSTOR UNIT AND IGNITION EXCITER WERE REMOVED AND REPLACED. THE APU WAS OPERATED SEVERAL TIMES AND LEAK AND OPERATIONAL CHECKS WERE GOOD. PART TOTAL CYCLES, 5,593.SDR AU961068Contactor · seized(AUS) APU STARTER CONTACTOR SEIZEDSDR 96ZZZX2895Relay · failedAPU WOULD NOT START. FOUND RELAY BURNED. REPLACED RELAY AND SHORT SECTION OF BATTERY LEAD WIRE, APU WORKS.SDR GLBA96080Start Contactor · failedSUX - CREW REPORTED A 'HOT' SMELL COMING FROM COPILOT'S SIDE PANEL (PANEL WAS HOT). MAINTENANCE REMOVED AND REPLACED APU START CONTACTOR AND ASSOCIATED ELECTRICAL CONNECTORS WHICH HAD BEEN DAMAGED BY HEAT. OPS CHECK WAS GOOD. (X)SDR 96UAL900234Exciter · malfunctionedLEFT IDG DISCONNECTED AND APU WOULD NOT START IN-FLIGHT AFTER 3 ATTEMPTS. FLIGHT DIVERTED TO SLC. SUPPLEMENTAL DATA UPDATE: REPLACED IGNITION EXCITER, IGNITION PLUG, AND LEAD. OPERATION CHECKS NORMAL. IGNITION EXCITERS ARE BEING UPGRADED PER OEM 49-41-09,SDR 96ZZZX1957Exciter · failedIGNITION EXCITER WILL NOT PRODUCE OUTPUT VOLTAGE TO PROVIDE APU START. FAILED TO OPERATE.SDR CA960315019Ground Lead · burnt(CAN)APU START GROUNDING LEAD LOOSE AT TERMINAL POST OF GROUNDING BRACKET CAUSING ARCING ELONGATION OF HOLE ON BRACKET. ONE TERMINAL LEAD BURNED. CORROSION AROUND HOLE MAY HAVE CAUSED BAD CONTACT.SDR 97ZZZX1045Housing · defectiveINSIDE DIAMETER OF END BELL WHICH RECEIVES THE INSERT IS OVERSIZED BY .1245 INCH. A BUSHING FABRICATED FROM WHAT APPEARS TO BE STEEL WAS FOUND INSTALLED IN PLACE OF THE REQUIRED OEM INSERT. THIS IS CONTRARY TO THE OEM MANUAL. ATA 49-20-08, PAGE 626, FIGURE SDR DL757954247K117 Relay · failedWORKING INOP APU, FOUND STARTER BURNED UP AND APU BATTERY DEAD. RELAY K-117 CONTACTS WELDED CLOSED CAUSING STARTER TO RUN CONTINUOUS UNTIL APU BATTERY WENT DEAD.SDR 9512865526Starter · failedDURING CRUISE AND WITH THE NR 1 ENGINE IDG ON MEL, THE APU SHUTDOWN DUE TO LOSS OF OIL. THE AIRCRAFT DIVERTED TO JNU WHERE AN UNEVENTFUL LANDING TOOK PLACE. THE IDG AND APU STARTER WERE REPLACED AND BOTH SYSTEM CHECKED OK.SDR DLM88952328Starter · oil leakON CLIMBOUT F/A REPORTED SMOKE ODOR IN CABIN, TURNED RT PACK OFF, SMOKE SEEMED TO DISSIPATE, RETURNED FLT TO PHL. FOUND OIL LEAK ON APU STARTER. ITEM WAS DEFFERRED PER MEL, ROR RETURN TO SERVICE, LATER STARTER WAS REPLACED, OPERATION NORMAL.SDR DL757950629Controller · faultyDURING CRUISE, HAD RIGHT GENERATOR AND DRIVE LIGHT, APU FAILED TO START, DIVERTED DFW. REPLACED APU BATTERY, CONTROLLER, AND IGNITION PLUG, OPERATION NORMAL. CONTROLLER HAD HISTORY OF NO FLAME FAULT.
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