JASC 2434

Service difficulty reports · 849

Reports filed under 2434 · DC 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 = '2434'
  ORDER BY difficulty_date DESC"

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SDR CA960924024Brushes · high resistance(CAN) AIRCRAFT ALTERNATORS WOULD NOT BALANCE. INSPECTION REVEALED A HIGH FIELD RESISTANCE. THE BRUSHES WERE FOUND TO HAVE A RESISTANCE OF 15-30 OHMS. REPLACEMENT BRUSHES SOLVED THE PROBLEM. SUBMITTER STATES THAT THIS IS THE THIRD SUCH OCCURRENCE.Sep 1, 1996 · Cessna 340ASDR 96ZZZX4372Alternator · wire brokenRIGHT ALTERNATOR 'FAIL' LIGHT FLICKERED AND CAME ON IN-FLIGHT, ALTERNATOR SHOWED TO HAVE CORRECT OUTPUT. REMOVED SAME WITH ANOTHER. AFTER 38 HOURS, THE REPLACEMENT ALTERNATOR HAD THE SAME PROBLEM. CALLED ELECTRO SYSTEMS AND CONVEYED PROBLEM TO SERVICE REP. Aug 23, 1996 · N41055 · Cessna 421BSDR 97ZZZX279Alternator · failedPILOT REPORTED LT ALTERNATOR LIGHT FLICKERED DURING TURBULENCE. LIGHT CAME ON STEADY ON THE WAY TO MAINTENANCE. REMOVED ALTERNATOR, HEARD SOMETHING RATTLING INSIDE. REMOVED COOLING SHROUD AND FOUND ONE BRUSH INSIDE. REMOVED BRUSH BLOCK AND FOUND A PIECE OFAug 21, 1996 · N27CY · Piper PA23250SDR 96ZZZX4757Alternator · inoperativeALTERNATOR FAILED WITHIN 40 HOURS OF OVERHAUL. A/E SN: A-80319. ARSNV2R045L.Aug 14, 1996 · N421CW · Cessna 421CSDR CA961003002Alternator · failed(CAN) THE AIRCRAFT RETURNED WITH A DEAD BATTERY. THE ALTERNATOR WAS FOUND TO HAVE NO OUTPUT. ALTERNATOR REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.Aug 13, 1996 · Cessna 172NSDR CA960909011Generator · hot(CAN) WHILE IN CRUISE FLIGHT, THE RIGHT HAND GENERATOR LIGHT CAME ON, FOLLOWED BY RIGHT HAND GENERATOR HOT LIGHT. THE ENGINE WAS SECURED AND THE AIRCRAFT RETURNED TO THE AIRPORT FOR AN UNEVENTFUL LANDING. THE GENERATOR WAS REPLACED AND THE AIRCRAFT RETURNED TOAug 13, 1996 · Gulstm G159SDR CA960826080Bearing · seized(CAN) GENERATOR LIGHT ILLUMINATED IN FLIGHT. AIRCRAFT LANDED AND MAINTENANCE FOUND THE BEARINGS SEIZED. ALTERNATOR REPLACED AND AIRCRAFT RETURNED TO SERVICE.Aug 6, 1996 · Moravn Z242LSDR 96ZZZX4133Alternator · lug brokenWHILE COMPLETING 100-HOUR FACTORY INSPECTION, FOUND ALTERNATOR MOUNT LUG ON LEFT ALTERNATOR BROKEN, ALTERNATOR SYSTEM WAS OPERATING. MOUNTING LUG WAS BROKEN OFF CASE OF ALTERNATOR. EXCHANGE ALTERNATOR INSTALLED.Jul 29, 1996 · N47RF · Gulstm 500SSDR AU961096Bearing · loose(AUS) RH ENGINE DRIVEN ALTERNATOR SLIP RING END BEARING LOOSE IN END HOUSING - BEARING HOUSING SUPPORT WEBS CRACKED AND BROKENJul 25, 1996 · Cessna 401ASDR 96ZZZX4391Generator · failedTHE AIRCRAFT EXPERIENCED VIBRATIONS AND AMP FLUCTUATIONS. THE PROBLEM WAS ISOLATED TO THE RIGHT GENERATOR. GENERATOR REMOVAL REVEALED BEARING FAILURE. THIS WAS THE SECOND FAILURE WITHIN 200 FLIGHT HOURS OF OVERHAUL. THE LEFT GENERATOR, S/N 2400, HAD THE IDJul 22, 1996 · N53JA · Lear 36ASDR 96ZZZX3889Alternator · defectiveALTERNATOR REPORTED TO BE 'FACTORY NEW' MISSING SHAFT-TO-DRIVE-COUPLING O-RING, P/N AN123864. MISING DRIVE-END SEAL, P/N 352068. ROTOR 'DRAGS' AND BINDS WHEN SPUN BY HAND. PROBLEMS FOUND DURING ROUTINE NEW PARTS INSPECTION.Jul 17, 1996SDR AU961071Wire · worn(AUS) NO4 GENERATOR FEED WIRE CHAFED THROUGH BY CONTACT WITH CARGO ACCESS DOOR UPPER LATCHJul 13, 1996 · Boeing 747438SDR CA960715011Alternator · broken shaft(CAN) THE ALTERNATOR DRIVE SHAFT FAILED AT THE BASE OF THE ALTERNATOR. THIS SHAFT APPEARED TO BE CRACKED OR HAD A PREVIOUS FLAW. THIS ALLOWED THE REMAINING SHAFT AND DRIVE GEAR TO MOVE FORWARD RUBBING ON THE CAM GEAR. THE RUBBER BUSHING, P/N 632050, AND METAL Jul 1, 1996 · Cessna 337GSDR AU960902Generator · disintegrated(AUS) NO1 ENGINE DRIVEN GENERATOR DISINTEGRATED - DAMAGE CAUSED TO NO1 ENGINE THROTTLE CABLE - INVESTIGATION FOUND DEFORMATION OF THE BACK PLATE CASTING WHICH MAY HAVE ALLOWED A MISALIGNMENT RESULTING IN INTERNAL FAILUREJun 29, 1996 · Bac 146200ASDR AU961162Bearing · loose(AUS) ALTERNATOR SLIP RING END BEARING INNER RACE LOOSE ON ROTOR SHAFTJun 27, 1996 · Cessna 340CESSNASDR AU961034Generator · faulty(AUS) RH DC GENERATOR FAULTYJun 25, 1996 · Emb EMB120SDR 96ZZZX4390Generator · failedTHE AIRCRAFT EXPERIENCED VIBRATION THEN GENERAL FAILURE ON THE RIGHT SIDE. BEARING FAILURE WAS THE CAUSE OF THE PROBLEMS. THIS WAS THE SECOND TIME IN 130 FLIGHT HOURS SINCE GENERATOR OVERHAUL.Jun 24, 1996 · N1AH · Lear 35ASDR 96ZZZX3544Pulley · separatedDRIVE PULLEY FOUND SEPARATED FROM VENT FAN DURING UNSCHEDULED MAINTENANCE. ALTERNATOR, 386.7 HOURS SINCE OVERHAUL. PULLEY TIME UNKNOWN. CORROSION EVIDENT ON MATING SURFACES OF DETACHED PIECES.Jun 17, 1996 · N8013Z · Cessna U206SDR 96ZZZX3382Brush Block · excess wearDISASSEMBLY AFTER ALTERNATOR FAILURE REVEALED PREMATURE AND EXCESSIVE WEAR ON BRUSHES. TIME SINCE OVERHAUL 141.0 HOURS. SUBMITTER STATED POSSIBLE DEFECTIVE BRUSHES OR IMPROPER INSTALLATION.May 28, 1996 · N103FS · Cessna 310RSDR 96ZZZX3089Bearing · failedCATASTROPHIC BEARING FAILURE OF ALTERNATOR ON RIGHT ENGINE AFTER TAKEOFF. PILOT RETURNED TO AIRPORT WITHOUT COMMUNICATION RADIOS. ONLY ADF AND GPS WAS STILL WORKING. PILOT REPORTED SEEING SPARKS FROM THE ALTERNATOR AND INTERIOR LIGHT FLICKERED. RADIOS WENTMay 28, 1996 · N610Z · Cessna 310RSDR 96ZZZX5119Alternator · malfunctionPILOT ATTEMPTED START, START SOLENOID CLICKING. LOW BATTERY OUTPUT TO LOW TO CLOSE SOLENOID. ALTERNATOR CHECKED FOR CHARGING. ALTERNATOR OUTPUT APPROXIMATELY 19.3 VDC FOR 24 VDC SYSTEM. ALTERNATOR REPLACED WITH OVERHAULED UNIT.May 24, 1996 · N756HQ · Cessna U206GSDR AU960622Generator · faulty(AUS) NO1 GENERATOR FAILED AND DROPPED OFF LINE - INTERMITTENT APU DELAY OFF SYSTEMMay 13, 1996 · Boeing 737476SDR CA960515009Tie Bolt · broken(CAN) ALTERNATOR CASE TIE BOLT BROKEN IN THREADED AREA, 1/2 INCH FROM THE END OF THE BOLT. THIS IS THE 3RD SIMILAR OCCURRENCE ON THIS AIRCRAFT. PREVIOUS CASES WERE ON DIFFERENT S/N ALTERNATORS.May 6, 1996 · Cessna 210RSDR AU960709Alternator · faulty(AUS) LH ENGINE DRIVEN ALTERNATOR FAULTY - ALTERNATOR HOUSING LOOSE DUETO LOOSE RETAINING BOLTS AND A WORN ALTERNATOR ATTACHMENT HOUSING- THE REPLACEMENT ALTERNATOR WAS SUPPLIED WITHOUT TAGS AND ON INSPECTION WAS FOUND TO BE INCORRECTLY ASSEMBLED AND THE ATTAMay 3, 1996 · Parten P68BSDR AU960684Bearing · failed(AUS) RH ENGINE ALTERNATOR BEARINGS DESTROYED - DRIVE AND DRIVEN GEARS DAMAGED - METAL CONTAMINATION OF OIL SYSTEMMay 3, 1996 · Cessna 310RSDR 96ZZZX3408Brush Kit · failedCOMPONENT WAS RECENTLY OVERHAULED. INSPECTION REVEALED BRUSHES WERE INSTALLED UPSIDE DOWN CAUSING WEAR INTO BRUSH LEADS AND PREMATURE FAILURE. SUBMITTER STATED THIS IS THE FOURTH FAILURE IN THE LAST SIX MONTHS DUE TO IMPROPER BRUSH INSTALLATION. ALL UNITS WMay 2, 1996 · Cessna 172SDR 96ZZZX3079Alternator · fluctuationREMOVED ALTERNATOR DUE TO AMPMETER FLUCTUATION. INSPECTED AND DETERMINED AUTOMOTIVE TYPE. COOLING FINS WERE INSTALLED IN OPPOSITE DIRECTION AS COMPARED TO O/H AERO ELECTRIC UNITS. ALTERNATOR REMOVED, HAD NO DATA PLATE OR ANY MARKINGS. UNIT REMOVED AND DISCApr 25, 1996 · N55498 · Piper PA28140SDR 96ZZZX2767Rotor Assy · shaft shearedC/W REMOVAL OF ALTERNATOR FOR 500-HOUR INSPECTION. UPON DISASSEMBLY, ROTOR SHAFT SHEARED OFF IN AREA OF NUT (PULLEY RETAINING) THREADS. EVIDENCE OF CRACK BEING VERY OLD EXISTS. MATERIAL CORRODED IN AREA OF CRACK (SHEAR AREA).Apr 25, 1996 · N5545T · Cessna R182SDR AU960556Diode · faulty(AUS) LH ALTERNATOR DIODES LOOSE AND BROKENApr 23, 1996 · Cessna 401ASDR 96ZZZX2877Alternator · fan failedLEFT ALTERNATOR COOLING FAN FAILED. FAN APPEARS TO HAVE LOST FIT BETWEEN SHAFT SHOULDER AND PULLEY. FAN BECAME OFF-CENTER AND BROKE THROUGH/SEPARATED SHAFT. FOUND FAN SEPARATED FROM ALTERNATOR AND LODGED BETWEEN ALTERNATOR BRACKET AND STARTER RING GEAR.Apr 17, 1996 · N854ND · Piper PA44180SDR CA960530002Fan · broken(CAN)PILOT HEARD LOUD BANG FOLLOWED BY AMMETER SHOWING DISCHARGE. ALTERNATOR SEPARATED FROM ENGINE. HOUSING MOUNTING LUGS BROKEN OFF BY VIBRATION DUE TO IMBALANCE FOLLOWING A PORTION OF THE FAN BREAKING OF F.Apr 1, 1996 · Beech A2319SDR COMA9610113Generator · failedRT ENGINE AUXILIARY GENERATOR FAILED. REPLACED THE AUXILIARY GENERATOR.Mar 25, 1996 · N463CA · Emb EMB120RTSDR 96ZZZX2142Alternator · wrong partDURING THE COURSE OF AN ANNUAL INSPECTION, DISCOVERED A 24-VOLT ALTERNATOR WAS INSTALLED ON A 12-VOLT SYSTEM. PART INSTALLED WAS ALU-8421LS, 24-VOLT, 70-AMP. ACCORDING TO THE PARTS BOOK PER SERIAL NUMBER OF AIRCRAFT, UNIT SHOULD BE A P/N ALY6421, 12-VOLT, 60Mar 21, 1996 · N9779J · Piper PA32R301SDR CA960321012Alternator · shorted field(CAN)DURING CLIMB BOTH ALTERNATORS WENT OFF LINE. AN INSPECTION REVEALED THAT THE RIGHT HAND COOLING FAN HAD SEPARATED FROM THE ALTERNATOR AND SOME OF THE PIECES WERE FOUND INSIDE THE ALTERNATOR THUS SHORTING THE FIELD. THE SHORTED FIELD CAUSED A VOLTAGE REGULMar 20, 1996 · Beech E95SDR 96ZZZX1937Alternator · inoperativeDURING FLIGHT, RT ALTERNATOR QUIT. INSTALLED OVERHAULED UNIT, ELECTRICAL SYSTEM OPERATED NORMALLY. SENT ALTERNATOR TO OVERHAUL SHOP AND HAD THEM RUN IT FIRST. THEY SAID UNIT WORKED OK. TOLD THEM TO OVERHAUL IT. HAVE NOT HAD ALTERNATOR PROBLEM SINCE. SUBMMar 11, 1996 · N9446Q · Beech 58SDR 97ZZZX3330Alternator · bearing failedAFTER ONLY 20 HOURS OF TIME, ALTERNATOR BEARING FOUND FAILED WITH BELT TENSION OK. ALTERNATOR ALSO HAS HIGH RESISTANCE. UNIT OVERHAULED BY PRECISION ELECTRONICS, INC.Feb 22, 1996 · N699RF · Piper PA60600SDR 96ZZZX2188Hub · failedSHORTLY AFTER START-UP, THE LEFT ALTERNATOR LIGHT ILLUMINATED. ACFT WAS SHUT DOWN AND INSPECTED. OUTBOARD BEARING OF ALTERNATOR FOUND FAILED. UPON ALTERNATOR REMOVAL, DRIVE HUB (PN 640934) WAS ALSO FOUND FAILED. THIS ALTERNATOR DOES NOT REQUIRE THE 100-HOUFeb 22, 1996 · N51SC · Cessna 402CSDR 96ZZZX2187Bearing · failedSHORTLY AFTER START-UP, THE LEFT ALTERNATOR LIGHT ILLUMINATED. ACFT WAS SHUT DOWN AND INSPECTED. OUTBOARD BEARING OF ALTERNATOR FOUND FAILED. UPON ALTERNATOR REMOVAL, DRIVE HUB (PN 640934) WAS ALSO FOUND FAILED. THIS ALTERNATOR DOES NOT REQUIRE THE 100-HOUFeb 22, 1996 · N51SC · Cessna 402CSDR AU960548Bearing · failed(AUS) ALTERNATOR REAR BEARING FAILED - BRUSHES WORN OUTFeb 18, 1996 · Piper PA32R301SDR 96ZZZX1097Control Unit · failedPILOT REPORTED LOSS OF ELECTRICAL POWER. AFTER LANDING, UNCOWLED ENGINE AND FOUND THE ACU WAS SMOKED. TROUBLESHOT AND FOUND THE ALTERNATOR WINDINGS OPEN. INSTALLED A NEW ACU AND INSTALLED A SERVICEABLE ALTERNATOR, PN C611503-0102. PERFORMED GROUND RUN, OPEFeb 18, 1996 · N9343D · Cessna 172RGSDR 96ZZZX1536Alternator · warning lightLOW VOTLAGE LIGHT WITH FULL LOAD. (PROP ICE, PITOT HEAT). AIRCRAFT LANDED. MECHANIC INSPECTED ALTERNATOR ATTACHMENTS, WIRING, AND BELT TENSION. NO DISCREPANCIES WERE NOTED. AIRCRAFT WAS TEST RUN ON THE GROUND AT SEVERAL POWER SETTINGS AND VARIOUS LOADS. Feb 8, 1996 · N6611C · Cessna T210NSDR CA960223006Drive Assembly · poles adrift(CAN)CUSTOMER BROUGHT IN THE ALTERNATOR FOR TEST AND REPAIR. DISASSEMBLY FOUND THE ROTOR ASSEMBLY LOOSE FROM THE SHAFT AND ABLE TO ROTATE ON THE SHAFT ABOUT 10 DEGREES.Feb 5, 1996 · Cessna 337GSDR AU960165Condenser · faulty(AUS) ALTERNATOR CONDENSER FAULTY - OUTER CASING WAS HOLED DUE TO WEAR CAUSED BY BEING LOOSE IN THE CLAMP BRACKET - PERSONNEL/MAINTENANCE ERRORFeb 5, 1996 · Piper PA28RT201SDR CA960202015Tie Bolt · broken(CAN)PILOT REPORTED AN INCREASING WHINING OVER THE HEADSET FOLLOWED BY THE #2 ALTERNATOR LIGHT ILLUMINATING. #2 ALTERNATOR SHUT DOWN AND THE AIRCRAFT FINISHED FLIGHT. MAINTENANCE FOUND THE LOWER ALTERNATOR TIE BOLT BROKEN AND WAS FOUND IN THE LOWER COWL AREA. Jan 26, 1996 · Cessna 210RSDR CA960126001Generator · lightning strike(CAN)DOUBLE LIGHTNING STRIKE ON DEPARTURE. DOUBLE DC GENERATOR FAILURE. EMERGENCY CHECK LIST CARRIED OUT. BOTH GENERATORS CAME BACK ON LINE. FIVE STATIC WICKS HAD TO BE REPLACED.Jan 24, 1996 · Dhav DHC8311SDR 96ZZZX888Brush Holder · brokenRIGHT ENGINE GENERATOR INOPERATIVE. FOUND BRUSH HOLDER BROKEN AND PIECES HAD SHORTED OUT ARMATURE. INSTALLED REBUILT UNIT.Jan 24, 1996 · N8383Y · Piper PA30SDR 96ZZZX812Generator · failedCATASTROPHIC FAILURE OF NR 1 DC GENERATOR. LOG BOOKS WERE NOT AVAILABLE, BUT ESTIMATED TSO TO BE 45-50 HOURS. CAUSE UNKNOWN DUE TO SEVERE DAMAGE OF THE GENERATOR.Jan 24, 1996 · N190DA · Lear 35ASDR 96ZZZX597Generator · brushes failedGENERATOR WENT 'OFF LINE'. DISASSEMBLY FOUND BRUSH LEADS CUT AND FRAYED BY BRUSH HOLDERS. REAR BEARING FOUND LOOSE IN REAR HOUSING CAUSING ROTATIONAL VIBRATION WHICH CAUSED BRUSH LEADS TO HIT BRUSH HOLDERS.Jan 15, 1996 · N8722M · Beech 23SDR CA960205013Controller · failed(CAN)DURING CRUISE #1 & #3 GENERATORS DROPPED OFF LINE. #2 GENERATOR INDICATED LOW FREQUENCY. #1 LOAD FREQUENCY CONTROLLER AND GENERATOR CONTROL UNIT REPLACED. #3 GENERATOR CONTROL UNIT REPLACED.Jan 12, 1996 · Lkheed 1011385115SDR AU960038Brush · worn(AUS) ALTERNATOR BRUSHES WORN EXCESSIVELY - PIGTAIL JUNCTION WORN INTO SLIP RINGJan 12, 1996 · Cessna 172N
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