JASC 2434

Service difficulty reports · 849

Reports filed under 2434 · DC Generator-Alternator, newest first.

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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 = '2434'
  ORDER BY difficulty_date DESC"

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SDR 9WQR202609170736Bolt · unsecureDURING AN ANNUAL INSPECTION THE ALTERNATOR WAS FOUND TO BE LOOSE BUT STILL WEDGED IN THE MOUNT, AND THE FAN BLADES RUBBING ON THE ENGINE/ALTERNATOR MOUNT. THE ALTERNATOR MOUNTING BOLT WAS FOUND IN THE LOWER COWLING, THE NUT AND WASHER WERE NOT FOUND. IT IS BSep 15, 2026 · N7299 · Cessna 182PSDR N3XR2026090100002Contactor · burnedALTERNATOR FAILED ON THE FINAL APPROACH WITH IGN PWR OFF ANNUNCIATOR. IP RECYCLED SWITCHES, BUT THE ANNUNCIATOR STILL EXISTED. REMOVED AND REPLACED CONTACTOR P/N: X61-0029 WITH NEW. THIS AIRCRAFT IS EQUIPPED WITH STC# SA02006CH: AIR CONDITIONING.Sep 1, 2026 · N870ER · Cessna 172SSDR N3XR2026090100001Contactor · burnedBUSS E & M VOLTS AT 24.2 AFTER ENGINE START. NO CHANGE IN VOLTAGE AT ANY POWER SETTING. BATTERY AMPS DISCHARGE -7 AT ALL POWER SETTINGS. R & R ALTERNATOR 24-VOLT CONTACTOR R & R ACU WITH NEW.Aug 8, 2026 · N813ER · Cessna 172SSDR 141A2026080300001Generator · malfunctionedPHNY TO PHNL FLT 663, CREW NOTICED A STANDBY POWER INOP CASS MESSAGE ILLUMINATED. GETTING READY TO COMPLETE STANDBY POWER INOP CHKLIST, NOTICED THE STANDBY POWER INOP CASS MESSAGE DISAPPEARED & GENERATOR OFF CASS MESSAGE ILLUMINATED. CREW SAW A DISCHARGE WITAug 2, 2026 · N932SP · Cessna 208BSDR 2026FA0000329Alternator · destroyedALTERNATOR DRIVE COUPLING DESTROYED CAUSING SUBSEQUENT FAILURE OF ENGINE'S DRIVE GEAR P/N 657984. ALL FOUR BOLTS P/N 649205 SHEARED OFF OR THREADS STRIPPED FROM SHANKS CAUSING SEPARATION OF GEAR FROM CRANKSHAFT. LOCK PLATES P/N 641909 FOUND IN TACT IN OIL SUMay 7, 2026 · N252AN · Mooney M20KSDR 2026FA0000327Alternator · destroyedALTERNATOR INPUT SHAFT HAS BEEN DAMAGED DUE TO DETROYED DRIVE COUPLING. DRIVE COUPLING HUB NO LONGER ROUND AND WOODRUFF KEY SLOT NO LONGER VISIBLE AS THE HOLE IS NOW EGG-SHAPED. DRIVE COUPLING HUB & GEAR COMPLETELY SEPARATED WITH NEARLY ALL RUBBER BUSHING MIMay 7, 2026 · N6823D · Cessna 340ASDR 2026FA0000211Brush Block · explodedALTERNATOR WOULD INTERMITTENTLY FAIL DURING FLIGHT. LANDED. ALT CHECKED FINE. PULLED BRUSH BLOCK ASSEMBLY. AND IT FELL INTO A MILLION PIECES. SEE VIDEO LINK WHILE ITS ACTIVE. SUSPECT CHINESE COMPONENTS FROM HET. FURTHER INVESTIGATION WARRANTED.Mar 24, 2026 · Cirrus SR22TSDR 2026FA0000210Alternator · failedFACTORY NEW ALTERNATOR SUDDENLY FAILED AFTER ONE MONTH AND 52 FLIGHT HOURS SINCE INSTALLATION. FAILURE OCCURRED IN CRUISE FLIGHT RESULTING IN A TOTAL ELECTRICAL POWER LOSS TO THE MAIN AIRCRAFT BATTERY. THIS NECESSITATED A PROMPT DIVERSION AND UNSCHEDULED LANDIMar 13, 2026 · N993MM · Cirrus SR22SDR 2025FA0000691Drive Belt · failedALTERNATOR BELT BROKE IN FLIGHT, AIRCRAFT LANDED SAFELY WITH APPROXIMATELY 20 MINS A BATTERY POWER REMAINING. THE BELT WAS ONLY 4 WEEKS OLD SINCE INSTALLED.Oct 2, 2025 · N9454C · Piper PA28161SDR ELYA10012025006Alternator · brokenLEFT ALTERNATOR FAILED CAS MESSAGE. WHILE TROUBLESHOOTING SMOKE SMELL BEGAN IN CABIN. LT ALTERNATOR WAS FOUND WITH TWO BROKEN CASE TIE BOLTS BY MAINTENANCE. BUS BAR FUSE FOUND POPPED. ALTERNATOR AND FUSE REPLACED. LH VOLTAGE REGULATOR REPLACED. OPS CHECK GOOD,Oct 1, 2025 · N260US · Tecnam P2012SDR 2025FA0000653Generator · bowedLOST EVERYTHING ON THE RIGHT SIDE. INCLUDING MACH TRIM FEDEC FAULTS FIVE INDICATIONS. DAU FAILS, TRIM FAIL.Aug 13, 2025 · N577JC · Cessna 750SDR 4USA2025072100510Generator · failedDURING CRUISE, CREW REPORTED “GEN FAIL R”. APPROXIMATELY 5-10 MINUTES LATER, IT WAS FOLLOWED BY “OIL LEVEL LOW R”. ABOUT 5 MINUTES LATER, THE CAPTAIN NOTICED THE OIL PRESSURE AND ITT START TO MOVE SO HE IMMEDIATELY SHUT THE ENGINE DOWN IN FLIGHT TO PREVENT FURJul 19, 2025 · N734DJ · Cessna 750SDR 2025FA0000458Alternator · inoperativeALTERNATOR FAILED IN FLIGHT CAUSING AN UNSCHEDULED LANDING AT HERITAGE AVIATION IN BURLINGTON, VT. ALTERNATOR WAS A FAIRLY NEW INSTALLATION ACCORDING TO CUSTOMER.Jul 8, 2025 · N413SL · Beech F33ASDR AALA202506209012Alternator · faultyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING CLIMB, "REVERSER LIMITED" LIGHT ILLUMINATED FOR THE NUMBER 2 ENGINE ON THE OVERHEAD PANEL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. TROUBLESHOOTED NUMBER 2 ENGINE THRUST REVERSERJun 19, 2025 · N334TL · Boeing 7378SDR AALA202506202065Stator · faultedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING CLIMB, "REVERSER LIMITED" LIGHT ILLUMINATED FOR THE NUMBER 2 ENGINE ON THE OVERHEAD PANEL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. TROUBLESHOOTED NUMBER 2 ENGINE THRUST REVERSERJun 19, 2025 · N334TL · Boeing 7378SDR AALA202504063856Stator · faultedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO PHX DUE TO THE FLIGHT CREW REPORTING AN ECAM ENGINE 1 REV MINOR FAULT AFTER TAKEOFF. THE AIRCRAFT LANDED SAFELY AT PHX WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED STATOR PERMANENTApr 5, 2025 · N429AN · Airbus A321253NXSDR HEEA202412180001Starter Gen · inoperative#2 GENERATOR FAILED DURING OUR HIGH ORBIT OF MC773. CONTINUED ORBITING AND FOLLOWED THE EMERGENCY PROCEDURE CHECKLIST. UNABLE TO RESET. LANDED AT MC773 WITHOUT INCIDENT.Dec 17, 2024 · N794P · Skrsky S76CSDR HYIA20241205001Belt · wornPILOT REPORTED DUAL ALTERNATOR FAILURE IN FLIGHT. USED EMERGENCY: BACK UP ESSENTIAL PATH AND BATTERY DID NOT PROVIDE POWER. BOTH ALTERNATORS, LH/RH POPPED CIRCUIT BREAKERS. MAINTENANCE INSPECTED AND NOTED THE LEFT ALTERNATOR PULLEY WAS LOOSE AND THE ALTERNATONov 28, 2024 · N357CA · Tecnam P2012SDR 2024FA0000862Alternator · inoperativePILOT EXPERIENCED LH ALTERNATOR FAILURE IN FLIGHT. TURNED LH ALTERNATOR SELECTOR TO OFF POSITION. SHORTLY AFTER, THE G1000 AVIONICS SYSTEM STARTED TO GO OUT. PILOT DECLARED EMERGENCY AND LANDED AT ROLLA NATIONAL (KVIH). SUSPECTED THE PILOT NEGLECTED TO MOVE LHNov 4, 2024 · N5ZR · Beech 58SDR 2024FA0000957Alternator · faultedALTERNATOR WOULD INTERMITTENTLY GO OFF-LINE. ULTIMATELY HIGH FIELD RESISTANCE WAS DETERMINED TO BE A FACTOR....VOLTAGE REGULATOR AND ALTERNATOR WERE REPLACED. CONTINENTAL SB23-4 WAS COMPLIED WITH IN CONJUNCTIONOct 29, 2024 · Raythn G36SDR 2024FA0000980Alternator · faultyREPAIR FACILITY HAS ENCOUNTERED APPROX 3 NEWLY OVERHAULED ALTERNATOR UNITS THAT HAVE FAILED OPERATIONAL CHECKS ONCE INSTALLED (WITH ZERO HOURS ON THE OVERHAUL).Oct 18, 2024 · N715MT · Cessna 172SSDR 2024FA0000545Annunciator · failedPILOT RECEIVED ALTERNATOR FAIL ANNUNCIATION IN FLIGHT DUE TO FAILED LAMAR ALTERNATOR INOP SWITCH A-00258-2.Jul 29, 2024 · N516AF · Piper PA28181SDR 2024FA0000534Drive Coupling · brokenGEAR PORTION OF COUPLER SLIPS INSIDE METAL/RUBBER HOUSING, CAUSING ALTERNATOR #2 TO REMAIN OFFLINE. A SECOND ALTERNATOR EXISTS WITHIN THE SYSTEM, SO NO INITIAL SAFETY OF FLIGHT ISSUES WITH LOSS OF POWER IF LANDING IS ACCOMPLISHED IN A TIMELY MANNER. THIS IS THJul 26, 2024 · N2117 · Cirrus SR20SDR 2024FA0000543Alternator · failedPILOT RECEIVED ALTERNATOR FAIL ANNUNCIATION ON PFD DUE TO FAILED LAMAR ALTERNATOR INOP SWITCH A-00258-2.Jun 27, 2024 · N500AF · Piper PA28181SDR 2024FA0000549Switch · failedPILOT RECEIVED INTERMITTENT ALTERNATOR FAIL INDICATIONS ON PFD. BELIEVED TO BE CAUSED BY FAILED ALTERNATOR INOP SWITCH. LAMAR A-00258-2.Jun 22, 2024 · N523AF · Piper PA28181SDR 2024FA0000550Switch · failedPILOT RECEIVED ALTERNATOR FAIL ANNUNCIATION IN FLIGHT DUE TO FAILED ALTERNATOR INOP SWITCH. LAMAR A-00258-2.Jun 10, 2024 · N6031F · Piper PA28181SDR HYIA20240514001Hub · excess playUPON REMOVAL OF AN ALTERNATOR, THE HUB NUT WAS FOUND TO BE LOOSE, ALLOWING THE THRUST WASHER TO ROTATE BY HAND. THE COTTER PIN REMAINED IN PLACE. THE UNIT WAS REMOVED FROM SERVICE PENDING FURTHER INVESTIGATION.May 10, 2024 · N903CA · Cessna 402CSDR 2024FA0000242Control Module · inoperativeAMMETER SHOWING DISCHARGE, NO VOLTAGE TO FIELD.Mar 21, 2024 · N24155 · Cessna 172PSDR IPXA2024022777693Battery · no testEMERGENCY POWER TEST FAIL R/R BATT 1 AND BATT 2 REF AMM 24-34-00 OPS CHK GOODFeb 27, 2024 · N274UP · Doug MD11FSDR DXTA2024013010753Generator · defectiveON TAXI OUT RECEIVED DC GEN OFF L AMBER CAS MESSAGE. RAN QRH, AND MESSAGE CLEARED. APPROXIMATELY 10 MINUTES LATER, STILL TAXING, THE MESSAGE RETURNED. RAN THE QRH ONE MORE TIME WITH THE MESSAGE CLEARING AND NORMAL INDICATIONS. AFTER TAKE OFF, AT APPROXIMAJan 29, 2024 · N593QS · Cessna 680ASDR HYIA20230901002Alternator · failedPILOT REPORTED THE RIGHT HAND ALTERNATOR OUT LIGHT ON MOMENTARILY AND ELECTRICAL FUMES ON FINAL. MAINTENANCE REPLACED THE RIGHT HAND ALTERNATOR WITH NO FURTHER DEFECTS NOTED.Aug 29, 2023 · N396CA · Tecnam P2012SDR 2023FA0000463Alternator · shortedTHE ALTERNATOR IS MOUNTED AS DESCRIBED IN THE STC SA01436AT INSTALLATION INSTRUCTIONS. THE POSITIVE CONNECTION IS TOUCHING THE ENGINE BAFFLING BUT COVERED WITH A RUBBER BOOT. WHEN THE RUBBER BOOT WEARS THROUGH THE POSITIVE WILL SHORT TO GROUND LEADING TO LOSS Aug 21, 2023 · N8588M · Beech P35SDR 2023FA0000395Alternator · seizedCREW REPORTED DURING GROUND RUN AND PRIOR TO TAXI, ENGINE MADE A LOUD NOISE, AND THE ENGINE WAS SHUT DOWN IMMEDIATELY. THIS HAPPENED PRIOR TO FLIGHT, WITH NO INDICATION OF A PENDING FAILURE. MAINTENANCE TECHNICIAN REPORTED THAT THE ALTERNATOR HAD SEIZED, ANJul 31, 2023 · N859JA · Cessna 182TSDR 2023FA0000394Alternator · seizedDC ALTERNATOR FAILED DURING GROUND RUN. UPON REMOVAL FOUND THE ALTERNATOR TO HAVE SEIZED. ALTERNATOR WAS SENT TO HARTZELL WITH AN RMA # 13301. PRODUCT WAS REPLACED WITH A NEW ALTERNATOR. NO REPORT WAS PROVIDED TO US ON WHY THE UNIT FAILED, ALTHOUGH WE HAVE Jun 23, 2023 · N437H · Cessna T206HSDR 2023FA0000296Alternator · failedENROUTE, CLOSE TO DESTINATION THE PILOT HAD A NEGATIVE RATE OF CHARGE AND WAS ON BATTERY POWER ALONE DUE TO ALTERNATOR FAILURE.Apr 28, 2023 · N3756W · Piper PA32260SDR 9JLA2022120139205Generator · faultedTHE FLIGHT CREW REPORTED THAT THE NO3 ENGINE GENERATOR FAILED DURING CLIMB AFTER TAKEOFF. THE FLIGHT CREW ELECTED TO RETURN BACK TO THE AIRPORT AND LAND SO THE MAINTENANCE TEAM COULD EVALUATE. THE BASE MAINTENANCE TEAM CONFIRMED DISCREPANCY AND REPLACED THE GENov 7, 2022 · N998RW · Amd FALCON7XSDR 2022FA0000679Alternator · defectiveALTERNATOR FAILED DURING FLIGHT. UPON DISCOVERING THE LACK OF CHARGE ON THE AMMETER, WE CYCLED THE ALTERNATOR POWER SWITCH AND CIRCUIT BREAKER, WITHOUT SUCCESS. WE THEN INFORMED APPROACH CONTROL OF OUR ALTERNATOR ISSUE AND REQUESTED DIRECT KSSF. UPON REACHISep 10, 2022 · N3MK · Cessna 177RGSDR AALA202206176440Control Unit · fault messageAIRCRAFT WAS GROUNDED: AIR RETURNED TO MIA ACCOUNT GENERATOR ISSUE/STANDBY POWER LIGHT ILLUMINATED MESSAGE. EMERGENCY WAS DECLARED. FLIGHT WAS OVERWEIGHT FOR LANDING. ACCOMPLISHED FIN CHECKS IAW 24-34-00. REPLACED STANDBY POWER CONTROL UNIT PER AMM 24-34-11.Jun 16, 2022 · N321RL · Boeing 737823SDR 2022FA0000041None · noneOPERATOR REPORTED "ALTERNATOR OUT" LIGHT ILLUMINATES INTERMITTENTLY. VISUAL INSPECTION OF WIRING AT ALTERNATOR REVEALED THE ALTERNATOR CASE HALVES WERE NOT SECURED TO EACH OTHER. FURTHER INSPECTION DETERMINED THE 4 PHILISTER HEAD SCREWS THAT HOLD THE CASE HAJan 21, 2022 · N488HP · Beech 100BEECHSDR 2021FA0000392None · wornPILOT REPORTS THE RIGHT HAND STARTER GENERATOR HAS SMOKE COMING FROM IT DURING START UP. COMPLIED WITH R&R OF AIRCRAFT STARTER GENERATOR. OPS TEST OK, AIRCRAFT OK FOR RTS.Jun 30, 2021 · N946WT · Hawbee 4000SDR N3XR202106030001Belt · separatedDURING THE LANDING APPROACH, THE SERPENTINE BELT (P/N-E4A-00-740-000) ON THE REAR OF THE INSTALLATION FAILED. THE FLIGHT CREW NOTICED THE ALTERNATOR WAS INOP AND THE COOLANT TEMPERATURE RISING RAPIDLY. A PRECAUTIONARY LANDING WAS MADE.May 24, 2021 · N304ER · Diamon DA42NGSDR 2021FA0000112Drive Shaft · shearedLEFT ALTERNATOR FAIL ANNUNCIATOR LIGHT ILLUMINATED. NO VOLTAGE INDICATION ON LEFT ALTERNATOR. WIRING TERMINALS WERE INTACT AND FIELD VOLTAGE WAS PRESENT. INSPECTION REVEALED THE ALTERNATOR DRIVE SHAFT SHEARED SEPARATING THE DRIVE SHAFT FROM THE ALTERNATOR DRIVApr 20, 2021 · N311BT · Cessna 414ASDR 9JLA2021022524810Generator · defectiveTHE FLIGHT CREW REPORTED THAT DURING FLIGHT THE GEN 2 BEARING FAIL EICAS MESSAGE ILLUMINATED. THE MAINTENANCE VENDOR DETERMINED THAT NO2 DC GEN WAS DEFECTIVE. THE DEFECTIVE DC GEN WAS REMOVED AND AN OVERHAULED GEN WAS INSTALLED. GROUND RUNS AND OPS CHECKS WEFeb 14, 2021 · N10HC · Emb EMB145SDR 3EJA727MM1/1/21Generator · inoperativeLOSS OF AIRCRAFT PRIMARY AND SECONDARY ELECTRICAL POWER. LOST ELECTRICAL DISPLAYS. DIVERTED TO KABQ. EMERGENCY DECLARED. LT GENERATOR WAS ON MEL DURING THIS FLIGHT. AT THIS TIME MAINTENANCE IS WORKING AIRCRAFT.Jan 1, 2021 · N727MM · Cessna 750SDR BEMA202012280001Alternator · burned outALTERNATOR IN THE NR 1 POSITION FAILED IN FLIGHT. THE MAIN POWER STUD IS ATTACHED TO A PORTION OF THE RECTIFIER PLATE JUST AFTER A 90 DEGREE BEND, BROKE OFF AND CAUSED SIGNIFICANT ARCING AND BURNING IN THE ALTERNATOR. RIGHT NEXT TO THE BEND IN THE RECTIFIER Dec 28, 2020 · N134BA · Beech 65A808800SDR IKBR2020111200015Alternator · failedALTERNATOR NR 1 FAILED INSTALLED OVERHAULED ALTERNATOR.Nov 10, 2020 · N922BP · Cirrus SR22SDR COEA2020110506899Alternator · failedFLIGHT 8690, ENROUTE PDX-RBG AIR TURNBACK/DISCREPANCY. ON CLIMBOUT, THE ALTERNATOR FAILED, AS WELL AS, THE NR 1 COMM AND GENERATOR WERE INTERMITTENT. RETURNED TO PDX, NO EMERGENCY WAS DECLARED. LANDED WITHOUT INCIDENT. CORRECTIVE ACTION: MAINTENANCE REPLANov 4, 2020 · N899FE · Cessna 208BSDR YV3R2020112100393Arm · brokenMAINTENANCE DISCOVERED ARM (ALTERNATOR ADJUSTMENT) BROKEN DURING 100 HOUR/ANNUAL INSPECTION.Nov 2, 2020 · N171WC · Robsin R44SDR YV3R2020102200369Arm · brokenCUSTOMER REPORTED ARM P/N: D728-1 BROKE (ALTERNATOR ADJUSTMENT ARM).Oct 13, 2020 · N930DK · Robsin R44RAVENIISDR HYIA20200918001Alternator · damagedTHE PILOT REPORTED AFTER LANDING SMOKE AND BURNING PLASTIC SMELL COMING FROM THE AREA OF THE RIGHT ENGINE. MAINTENANCE INSPECTED AND FOUND THE RIGHT ENGINE ALTERNATOR HAD AN ELECTRICAL SMELL. REMOVED AND REPLACED THE RIGHT ENGINE ALTERNATOR AND VOLTAGE REGULSep 18, 2020 · N706CA · Cessna 402C
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