JASC 2421
Service difficulty reports · 4,277
Reports filed under 2421 · AC Generator-Alternator, 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 = '2421' 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 = '2421' 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 QR9R2025100900004Sensor · out of limitsPREFLIGHT, GENERATOR SPLIT WAS GREATER THAN 10. NR 1 GENERATOR WAS PRODUCING 10-15 AMPS. NR 2 GENERATOR WAS PRODUCING 35-40 AMPS. REMOVED AND REPLACED CURRENT SENSOR IAW AMM 24-30-00, 4-6.SDR DXTA2025101005232Gcu · faultedWHILE CRUISING AT FL430 WE RECEIVED A GEN ONE OFF BUS CAS MESSAGE. WE PROCEEDED TO ACCOMPLISH THE QRH FOR THAT MESSAGE. SHORTLY AFTER RETURNING THE SWITCH TO THE AUTO POSITION THE AIRPLANE WENT INTO FULL ELECTRICAL EMERGENCY WITH CABIN HIGH ALTITUDE CAS AS WELSDR CALA2025100909860Gcu · faultedELEC GEN OFF R2 ADVISORY R2 ENGINE DRIVEN GENERATOR IS OFFLINE. FIM 31-90-F8-01A-421B-A CMC MSG 2416693. RIGHT 1 GENERATOR CONTROL UNIT GENERATOR CONTROL UNIT REPLACED REF AMM DMC-B787-A-24-22-02-01A-720A-A UPTO SECTION D SUB SECTION 5. OPS CHECKED GOODSDR CALA2025100309604Idg · faultedRIGHT GENERATOR DRIVE LIGHT CAME ON DURING FLIGHT DEBRIEFED CREW. CREW STATED LIGHT CAME ON DURING FLIGHT. ACCOMPANIED BY EICAS STATUS R GEN DRIVE. REF FIM 24-20 FAULT TREE 801. BITE CHECKED BPCU, FOUND FOLLOWING MESSAGES, ATTACHED PIX DRAINED RIGHT IDG OIL ASDR AALA202510026944Idg · failedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: APU FAILED IN FLIGHT, CAUSED A SINGLE SOURCE OF ELECTRICAL SOURCE. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MEM. REMOVED AND REPLACED LOW OIL PRESSURE SWITCH, PER AMM 49-94-22. REMOVED AND REPLACED NUMSDR I5PA2025092968806Switch · inoperativeAPU GENERATOR SWITCH INOPERATIVE. REPLACED APU GENERATOR SWITCH PER AMM.SDR CALA2025092909391Idg · faultyELEC IDG 1 LO OIL PR AT50 KNOTS. COMPLIED WITH MEL 2420E, PRIOR TO CLEARING THIS MEL AND RESTORING THE INOP IDG TO SERVICE PYLON MOUNTED IDG CONNECTORS MUST BE VISUALL INSPECTED FOR ARCING CONDITIONS REF AMM 24-21-43-210-048C1 AND AD 2011-19-01-R1. NO HISTOSDR CALA2025092509263Idg · faultedRIGHT GEN OFF EICAS. UNABLE TO RESET AFTER ONE ATTEMPT. PERFORMED BPCU BITE CHECK IAW FIM 24-20 TASK 801. FAULTS FOR RT GEN AS FOLLOWS: IDG HIGH RISE TEMP, & GEN/FIELD/WIRING/GCU. REF FIM 24-20 TASK 804 FOR IDG HIGH RISE TEMP, VERIFIED DPI WAS NOT EXTENDED, RSDR QR9R2025092400004Sensor · out of limitsDURING START RUNUP, GEN FAILURE 2 SPLIT 30 A, THEN BACK TO NO SPLIT. AVIONICS VERIFIED #1 HALL SENSOR BAD. REMOVED AND REPLACED SENSOR IAW AMM 24-30-00, 4-2. MOC COMPLETED OK IAW AMM 24-30-00, 5-3.SDR AALA202509259776Generator · shutdownAIRCRAFT WAS GROUNDED: APU GENERATOR OFFLINE EICAS AND SWITCH NON NORMAL CHECKLIST COMPLETED UNSUCCESSFULLY. AIRCRAFT DIVERTED TO LHR LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED APU GENERATOR IAW AMM 24-21-01-400-801.SDR QMLA2025091820095Warning Light · illuminatedGEN LIGHT ILLUMINATED 5 TIMES IN FLIGHT. IT RESET EVERY TIME. OPTED NOT TO CONTINUE THE FLIGHT BEYOND SYRACUSE.SDR YENA2025091700943Gcu · faultedFLT#1621, LHR-BOS. (ETOPS) L-1 TSI ELEC GEN 1 FAULT-DUE TO ELEC GEN 1 FAULT ON PFR IN LHR & GCU1 SHOWING THE AT FAULT, REMOVED AND REPLACED GCU NR 1 IAW AMM 24-22-34. OPS CHK GOOD. TSI CLOSED. GROUND VERIFICATION C/W PER AMM 24-22-34.SDR AALA202509174386Idg · out of toleranceAIRCRAFT WAS NOT GROUNDED: EMERGENCY LIGHTS AND SEATBELT SIGN AND NO PORTABLE DEVICES SIGNS AND ALL LIGHTS INCLUDING EMERGENCY LIGHTS COME ON AND START FLASHING WITH SOME SORT OF HIGH PITCH ALARM WITH NO CREW INPUT. CABIN LIGHTS GO TO FULL BRIGHT AND CAN NOT BSDR UIEA2025091101180Idg · faultedELEC DRIVE 1 ILLUMINATED ON EICAS. REMOVED AND REPLACED #1 IDG PER AMM 24-11-01. OPS/LEAK CHECK GOOD. MESSAGE CLEARED.</P>)SDR CALA2025091108780Generator · failedELEC BACKUP GENERATOR LT EICAS ADVISORY LT BACKUP GENERATOR IS OFF OR HAS FAILED. BACKUP CONVERTER INTERROGATED MAT & DISCOVERED MAINT MESSAGE 24-46080, REQUIRES FIM 24-25 TASK 861. FOUND OIL LEAKAGE UNDER NR 1 ENG. REQUEST INSPECTION FOR L BUG TERMINAL STSDR YENA2025090900922Generator · faultedFLFLT# 842, DUB-BOS. (ETOPS) "AC GEN CLASS II MX MSG ( CLASS II MX MSG - GPCU OR AC GEN ); PERFORMED BITE TEST OF EPGS REF TSM 24-22-00-810-832-A. AC GEN 2 PASS. NO FAULTS. MDDR CLR. MX-4 UPD. PLACARD REMOVEDSDR DXTA2025090804842Generator · failedLEFT GENERATOR FAILED AT 34,000. RIGHT GENERATOR FAILED AT 34,000 FEET. REMOVED LT GENERATOR POWER MODULE, P/N: R3608·011, S/N: 3270G, AND INSTALLED NEW GENERATOR POWER MODULE, P/N: R3608-011, S/N: 4816G, ACCOMPLISHED OPERATIONAL CHECK AND FOUND NO DISCREPASDR QR9R2025090500002Sensor · fluctuatesGEN AMP SPLIT GREATER THAN TEN AMPS (#1 GEN). AMPS FLUCTUATED BETWEEN 5-25 AMP DIFFERENCE. REMOVED AND REPLACED #1 HALL SENSOR IAW AMM 24-30-00, 4-6.SDR CALA2025090308434Idg · faultedNUMBER 2 ENG GEN SOURCE OFF LIGHT ILLUMINATED. GEN 2 INDICATED 24 DC BUT NO VOLTS OR FREQ AC. DRIVE DISCONNECTED #2 IDG HAD BEEN DISCONNECTED. REMOVED LIGHT BULBS FROM #2 ENG DRIVE LIGHT AND GEN LIGHT FOR #2 ENG. FOUND #1 ENG IDG TO BE OVER SERVICED. RESERVICESDR QXEA2025090200299Idg · malfunctionedFLIGHT 2365. ON TAKEOFF AFTER SPOOL UP TO TARGET N1, RIGHT HAND LANDING LIGHT FLICKERED FOLLOWED BY DU4. A MASTER CAUTION IDG 2 OFF BUSS SHOWED ON EICAS ( ENGINE DRIVEN GENERATOR - (IDG, GCU, GLC) ). REJECTED TAKEOFF AND RETURNED TO GATE. REMOVED FROM SERVICE.SDR DALA2025090106463Idg · faultedMISC/DE - DUE TO ELEC IDG 1 OIL LO PR ECAM WARNING. REMOVED AND REPLACED IDG NR 1. PERFORMED OPS AND LK CK AND IDG DISCONNECT, DURING ENGINE RUN. OPS CKD GOOD. (LP: 7222087)SDR HALA20250826263Gcu · no testDIV - ECAM: GEN 1 FAIL. EPGS SYSTEM TEST: GCU 1 TEST FAILED. FAULT MESSAGE IDG1(E1-400XU)SERVO VLV/GCU1 (1XU1). PERFORMED TSM 24-20-00-810-914-A. FOUND CABLE E1-400XU CONTAMINATED AND SLIGHTLY LOOSE. CLEANED AND SECURED AS REQUIRED. RESISTANCE & WIRE CHECKS ALSDR AALA202508266352Stator · faultedAIRCRAFT WAS GROUNDED: ENG 1 FADEC ALTERNATOR FAULT. DECESION MADE TO RETURN TO CLT, NO EMERGENCY DECLARED AIRCRAFT LANDED WITHOUT INCIDENT. T/S IAW TSM 77-10-00-810-839-A FOUND THAT PREVIOUS TROUBLESHOOTING SHOWS HARNESS TO BE GOOD. SAME FAULT RETURNED, FOUNDSDR HALA20250818249Generator · faultedETOPS - ELEC GEN 1 FAULT- AT CRUISE DID NOT RESET. REMOVED & REPLACED #1 IDG PER AMM 24-21-51. OPS CHECK IS GOOD. OKAY TO CONTINUE.SDR CALA2025081807903Gcu · inoperativeGROUND POWER DISCONNECTED, WOULD NOT TAKE APU POWER, EITHER TRANSFER BUSS OFF ILLUMINATED BOTH SIDES FOUND FAULT ON APU GENERATOR CONTROL UNIT FOR GCB/APB FAULT. CREW STATED: ELECTRICAL /RUBBER SMELL THROUGHTOUT CABIN AND FLIGHT DECK. APU GCU WILL NOT TEST SDR HALA20250815248Gcu · faultedETOPS - APU GEN FAULT- RESET GEN PER ECAM. SUCCESSFUL RESET. REMOVED AND REPLACED GAPCU PER AMM 24-41-400-801-B. OPS CHK GOOD FAULT CLEARED OK FOR SVC.SDR YENA2025081200826Warning Message · false activationFLT#2260, MAD-BOS. (ETOPS) "AC GEN CLASS 2 MX FAULT ( CLASS II MX MSG - GPCU OR AC GEN ); RESOLVED ON W/O: 1433748 TASKCARD: NR-00001) PERFORMED TROUBLESHOOTING PER TSM 24-22-00-810-832A NO DEFECTS NOTED, WIRING CHKS OK, GVI OK, IDG OIL LEVEL OK. THIS CLEARS MSDR 2025F00210Generator · failedGENERATOR OFF "CASS" MESSAGE IN FLIGHT, CREW RETURNED TO FIELDSDR SCNA20250807295Generator · trippedWHILE BOARDING APU GENERATOR KICKED OFF LINE. MANUALLY PUT GENERATOR BACK ON LINE. DISTINCT ELECTRICAL SMELL IN FLIGHT DECK CABIN. PERFORMED FUMES IN CABIN FIM 21-00 TASK 806 NO DEFECTS NOT AT THIS TIME A/C OK FOR SERVICESDR CALA2025080407236Gcu · faultyON ROTATION CAP FLT INSTRUMENTS BLANKED OUT. LT GEN CONTACTOR LIGHT ON RESET OK LOCKED CAPTAIN NOTIFIED THAT INSTRUMENTS CAME BACK ON WHEN LT GEN WAS RESET INSTRUMENTS OPS NORMAL REST OF FLT. APPEARS PIREP IS REFERRING TO LT GEN CONT OFF LIGHT BEING ILLUMINASDR YENA2025072800772Generator · faultedFLT#824, LAX-JFK. (ETOPS) CLASS II AC GEN ON STATUS PAGE ( CLASS II MX MSG - GPCU OR AC GEN ); T/S FOUND PIN 3 OF 4000XUB CONNECTOR SHORTED TO GND WITH 405VCA DISCONNECTED. R/R 4155KS HARNESS ON #2 ENG REF PW1100G-A-24-21-61-00A-720A-D. PERFORMED OPS CHK WITSDR VNAA2025073111101Gcu · faultedACFT ESS BUSS CAUTION MSG IN FLIGHT. REMOVED AND REPLACED IDG GCU 1 IAW AMM 24-11-07-000/400-801-A01, PERFORMED OPS TEST IAW AMM 24-11-01-710-801-A01-PSA, OPS CHECK GOOD.SDR YENA2025072300756Idg · failedFLT#687, BOS-LAX. (ETOPS) AC GEN CLASS 2 MX MSG ( CLASS II MX MSG - GPCU OR AC GEN ); REMOVED AND REPLACED ENG2 IDG PER AMM 24-21-51 OPS CHK GOOD. PLACARD REMOVED.SDR CALA2025072106749Idg · faultyIN FLT AT FL330 LEFT GEN DRIVE EICAS LT CAME ON. 30 SEC LATER LE FT GEN DISCONNECTED. DEBRIEFED CREW - IN CRUISE APPROX FL310 NR. 1 GEN DRIVE EICAS MESSAGE AND LIGHT ILLUMINATED. GEN AUTOMATICALLY DISCONNECTED. BPCU BITE INDICATES MULTIPLE FAULTS, INCLUDING HSDR QR9R2025071700001Sensor · out of limitsNUMBER 1 GCU WOULD NOT HOLD AMPERAGE WITHIN LIMITS. REPLACED NR 1 CURRENT SENSOR IAW AMM 24-30-00,4-6. OPERATIONAL CHECK GOOD IAW AMM 24-30-00, 5-2.SDR CALA2025072106770Drain · leakingE1 ESN 900325 EXPERIENCED AN INCREASE IN OIL CONSUMPTION. PLEASE ACCOMPLISH A SNIFF CHECK OF THE OIL FOR FUEL SMELL IN THE OIL S YSTEM, REF. AMM 12-13-01-200-003-002. ACCOMPLISH FIM 71-05 TASK 805 STEPS D.(1) TO D.(3). FOUND NO FUEL ODOR AT THE FILL PORT OF SDR DALA2025071505317Idg · damagedSHIP 3269 - DIV - TO AUS DUE APU ON MEL AND #2 IDG OIL TEMPERATURE ABOVE 147 DEGREES. CORRECTIVE ACTION: REPLACEMENT OF IDG #2 IN PROGRESS. (LP: 7809135)SDR WX0A2025071432500Generator · inoperativeF/A STATES DIRTY SOCK ODOR FROM TOP OF DESCENT UNTIL FINAL APPROACH, ACCOMP TC 21-000-001, RAN APU, ENGS 1 & 2 BLEED WITH PACKS 1 & 2. UNABLE TO DUP ODOR. APU OIL LEVEL IN RANGE & NO EVIDENCE OF OIL. C/W TC 21-000-002, NO SMELL, W/O 527112, PERFRMD T/C 21-00SDR DALA2025071105225Relay · faultedSHIP 9552-DIV- FLIGHT DIVERSION TO CLE DUE TO LOSS OF LEFT GEN AND LEFT AC BUS CROSS TIE LOCKOUT. / CORRECTIVE ACTION: RESET LEFT PCDU & RESET LEFT BUS TIE SWITCH. AS PRECAUTIONARY REPLACED EPCU, PCDU, L GENERATOR RELAY AND L BUS TIE RELAY. OPS NORMAL AND RETUSDR CALA2025072106741Idg · explodedLEFT GEN DRIVE EICAS C THE LT GEN DRIVE HAS LOW OIL PRESSURE OR HIGH OIL TEMPER ATURE WHILE THE ENGINE IS IN OPERATION. LT ENG. C-DUCT OPENING AS AMM 78-31-00 THE FOLLOWING DAMAG ES HAS BEEN OBSERVED AS X GENERAL OVERVIEW: IDG ASSY ALL IDG OI L HOSES APPEARINSDR YENA2025070700685Generator · warning messageFLT#2104, BOS-LGW. CLASS II MAINTENANCE AS GEN ON STATUS PAGE AFTER ENG SHUT DOWN ( CLASS II MX MSG - GPCU OR AC GEN); PERFORMED BITE TEST OF THE EGPS IAW AMM 24-41-00 BITE TEST GOOD MDDR CLEARED PLACRD REMOVED.SDR CALA2025070706281Generator · faultedRIGHT GEN CONT TRIPPED INFLIGHT CLIMBING THRU FL270 GENERATOR RESET PER FLIGHT MANUAL PROCEDURES WITHOUT ANY RECURRENT ISSUES. AS R EEC FAULT PIMU RECAL TEST PERFORMED IAW AMM 77-35-00-742 FAULT T2/P2 PRB HT AND 28V PERF SOL PWR. TS C/O IAW 73-21. PERF SOL SDR DALA2025070705021Idg · faultySHIP 6701 -ATB/DE- DUE TO LEFT IDG INOP AFTER TAKEOFF DUE TO DRIVE LIGHT. APU STARTED AND OPERATED NORMAL. CORRECTIVE ACTION: DEFERRED TO MEL. (IDG SUBSEQUENTLY REPLACED)SDR FDEA202507011087Idg · faultedIN FLIGHT L GEN OFF AND ASSOCIATED EICAS. L AC BUS OFF. RESET IN FLIGHT. OPERATED NORMALLY FOR 20 MINUTES. SAME MALFUNCTION AGAIN DURING DESCENT. EMERGENCY DECLARED. BITE CHECKED BPCU PER FIM 24-20 F/T 801. FOUND SAME MESSAGES AS PREVIOUS L GEN SYSTEM DSDR YENA2025062500650Gcu · failedFLT#2261, BOS-MAD. (ETOPS) "AC GEN CLASS II. REPLACED 4155KS ENG1 GEN HARNESS. TEST OF GEN 1 OK. ER GROUND VERIFICATION PASSED MX-4 UPDATED PLACARD REMOVED.SDR CALA2025062605933Idg · lowL GEN DRIVE LGT ON TAKEOFF ROLL. LOW SPEED REJECT. MAX SPEED 90K TS. INSPECTED #1 IDG NO LEAKS NOTED DPI INDICATOR NOT POPPED FOUND LOW OIL QTY, SERVICED 3 QUARTS OF OIL REF MM 12-13-03 BIT BPCU LAST LEG FAULT FOR L/H GEN 2 FAULTS PRESENT "SERVICE IDG" - "IDG SDR CALA2025062505870Idg · faultedRT GEN DRIVE LIGHT ILLUMINATED.FL310 35 MINS INTO FLIGHT.. UPDATE WITH EICAS MESSAGE, R GEN DRIVE HIGH IDG RISE TEMP UPDATE WITH BPCU INFO REMOVED AND REPLACED #2 ENGINE IDG AS PER AMM 24-11-01-404-001-006. OPS CHECK GOOD. FOUND OIL LEAKING FROM IDG SERVICE SDR CALA2025062605931Idg · faultyGENERATOR DRIVE SYSTEM EICAS MESSAGE (01=L,02=R) GEN DRIVE DISPL AYED. GEN DRIVE LIGHT ON. GEN DRIVE DISCONNECTED 02 ON CLIMB OUT COMPLETED CHECKLIST"R IDG OIL LEVEL" MSG PERFORMED BPCU BITE IN REFERENCE TO 24-20 FAULT TREE 801 AND FOUND THE FOLLOWING MESSAGESSDR CALA2025061705589Generator · faultedAT ROTATION LEFT GEN FAILED. BUS TIE DID NOT PICK UP. RAN AC BUS OFF CHECKLIST AND GOT RESET BITE CHECKED BPCU, FOUND FAULT MSG LEFT GCU REPLACED LEFT GCU, REF AMM 24-22-02. GCU PASSES INSTALL TEST. PERFORMED #1 ENGINE RUN, LEFT IDG OPERATED NORMALLY WITH ELESDR YENA2025061600607Gcu · faultedFLT#31, BOS-AMS. (ETOPS) MX AC GEN CLASS II MESSAGE DEISPLAYED ( CLASS II MX MSG - GPCU OR AC GEN ). REMOVED AND REPLACED GCU 1 PER AMM 24-22-34. BITE TEST PASS NO PRESENT AC GEN FAULT. MX-4 UPDATED MCC NOTIFIED.
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