# Service difficulty reports: JASC 2421

A list on [JASC 2421](https://openairdocs.org/jasc/2421.md).

Reports filed under 2421 · AC Generator-Alternator, newest first.

Page 1 of 86 · 4,272 reports

- [SDR ABXA20261019472](https://openairdocs.org/sdr/ABXA20261019472.md): Generator · faulted · Oct 19, 2026 · N1013A · Boeing 76736N
  > L GEN DRIVE DISC LIGHT FLICKERING ON PUSHBACK AFTER ENGINE STARTA/C RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C. MTX DEFERRED LH GEN FOR DEPARTURE IAW MEL ABX MEL 24-00-1-1 MEL PROCEDURES C/W A/C DOWNGRADED TO ETOPS 120 PLACARD ROTATED MEL PLACARD INSTALLE
- [SDR N3XR202610130001](https://openairdocs.org/sdr/N3XR202610130001.md): Control Unit · burned · Oct 9, 2026 · N923ER · Cessna 172S
  > THE ALTERNATOR CIRCUIT BREAKER POPPED AFTER A PREVIOUS RESET. THE ACU (ALTERNATOR CONTROL UNIT) P/N-AC2101, S/N-Y59830 FAILED. INSTALLED A NEW ACU, AND THE FUNCTION CHECK PASSED.
- [SDR QREA202610140007](https://openairdocs.org/sdr/QREA202610140007.md): Alternator · overheated · Oct 7, 2026 · N5JM · Cessna 525C
  > RIGHT AC GENERATOR FAILED IN FLIGHT WHICH CAUSED RH WINDSHEILD HEAT FAIL. AIRCRAFT WAS ENROUTE TO TXKF OCEANING FLIGHT FROM KHPN. EXITED ICING CONDITIONS AND RETURNED TO BASE AT KDXR
- [SDR AALA202609273893](https://openairdocs.org/sdr/AALA202609273893.md): Idg · failed · Sep 26, 2026 · N519UW · Airbus A321231
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW DUE TO THE FLIGHT CREW REPORTING THAT IDG 2 FAILED ON DEPARTURE - THE FLIGHT CREW ACCOMPLISHED THE QRH PROCEDURE TO SHUT DOWN THE IDG AND GENERATOR 2 - THE AIRCRAFT LANDED SAFLEL
- [SDR AALA202609254693](https://openairdocs.org/sdr/AALA202609254693.md): Generator · disconnected · Sep 23, 2026 · N824AN · Boeing 7879
  > AIRCRAFT WAS NOT GROUNDED: LEC GEN DRIVE L1 ILLUM IN FLT. L1 GENERATOR WAS DISCONNECTED PER THE CHECKLIST. GENERATOR DISCONNECT WAS VERIFIED BY THE AMBER X ON THE ECLECTIC SYNOPTIC. DECESION WAS MADE TO DIVERT TO LAX. AN EMERGENCY WAS DECLARED AND AIRCRAFT WAS
- [SDR CALA2026092419779](https://openairdocs.org/sdr/CALA2026092419779.md): Idg · faulted · Sep 23, 2026 · N674UA · Boeing 767322
  > LEFT ENG OIL PRESSURE DROPPED TO RED LEVEL. LT ENG SHUTDOWN. OIL PRESS REMAINED AT 58. OIL LIFTED BY 22QTS. LT ENG IDLE RUN ACCOMP FOR 5 MINS WHILE MONITORING OIL QTY IAW AMM 71-00-00-712-021-N00. SHUTDOWN ENG, OIL QTY DROPPED 1 QT & PUDDLE OF OIL UNDER ENG
- [SDR FDEA202609191372](https://openairdocs.org/sdr/FDEA202609191372.md): Gcu · failed · Sep 19, 2026 · N605FE · Doug MD11F
  > AC BUSS 3 OFF LEVEL 1. BUSS DID NOT FAIL UNTIL MULTIPLE ITEMS ON BUSS FAILED OVER A PERIOD OF ABOUT 7 MINUTES. FIRST OIL PRESS 3, THEN ICE DET SINGLE, THEN FO RA, THEN TANK 1 PUMPS LO, THEN AUTO SLAT FAIL, THEN AUTOTHROTTLES FAILED, THEN NO AUTOLAND, T
- [SDR CALA2026092119569](https://openairdocs.org/sdr/CALA2026092119569.md): Idg · faulted · Sep 19, 2026 · N674UA · Boeing 767322
  > EICAS MSG: LT GEN DRIVE DISPLAYED. GEN DRIVE LIGHT ILLUM. FOLLOWED CHECKLIST TO DISCONNECT LT GENERATOR, REMOVED & REPLACED THE IDG IAW AMM 24-11-01-004-002-006 & AMM 24-11-01-404-001-006 UP H PROCEDURE. INSPECTION VERIFIED PROPER CONNECTION AND TORQUE O
- [SDR DALA2026092105254](https://openairdocs.org/sdr/DALA2026092105254.md): Idg · inoperative · Sep 17, 2026 · N951DX · Boeing 7379GPER
  > ABORTED TAKEOFF AT 60KTS DUE TO A NR 1 GENERATOR SOURCE OFF LIGHT. DEFERRED NR 1 GENERATOR PER MEL 24-000-01. REPLACED ENGINE 1 IDG. (LP 9109948 - AIRCRAFT WAS GROUNDED)
- [SDR CALA2026091819535](https://openairdocs.org/sdr/CALA2026091819535.md): Generator · faulted · Sep 16, 2026 · N24976 · Boeing 7879
  > R2 GENERATOR FAILED. RESET IAW CHECKLIST, NOT SUCCESSFUL, FOUND MAINT MSG 24-16074 LATCHED. REMOVED NR 2 ENG R2 VFSG IAW AMM DMC-B787-A-24-21-09-00B-520A-A. FIM DMC-B787-A-24-20-F0-12A-421A-A. STARTED INSTALLATION OF NR 2 ENGINE RT VSFG IAW AMM 24-21-09-0
- [SDR YENA2026091400798](https://openairdocs.org/sdr/YENA2026091400798.md): Generator · malfunctioned · Sep 13, 2026 · N2142J · Airbus A321271NX
  > FLT 842, DUB-JFK. (ETOPS) AC GEN CLASS 2 MX MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY GPCU OR AC GEN). OPEN
- [SDR DALA2026091505142](https://openairdocs.org/sdr/DALA2026091505142.md): Gpu · faulted · Sep 10, 2026 · N515DE · Airbus A321271NX
  > ATB - DUE TO ELEC GEN 1 FAULT. CORRECTIVE ACTION: DEFERRED NBR 1 ENGINE IDG DISCONNECT PROCEDURE PER A321 AMM 24-21-00 AND AMM 71-00-00 AND CONTINUED ON MEL 24-20-01B. LATER, REPLACED GCU. (LP 9091024 - AIRCRAFT WAS GROUNDED)
- [SDR I5PA2026090888802](https://openairdocs.org/sdr/I5PA2026090888802.md): Idg · inoperative · Sep 8, 2026 · N888LT · Boeing 757230
  > TOPS SIGNIFICANT REPORT. LEFT IDG INOPERATIVE, ON MEL. REPLACED LH IDG PER APPLICABLE AMM
- [SDR DALA2026090404991](https://openairdocs.org/sdr/DALA2026090404991.md): Generator · leaking · Sep 3, 2026 · N419DX · Airbus A330941
  > ATB, DUE TO RUBBER ODOR IN THE CABIN, AFTER TAKEOFF. FOUND OIL LEAK FROM THE APU GENERATOR. GENERATOR REPLACED AND INTAKE DUCT CLEANED. ECS LEVEL B DECONTAMINATION AND RECIRC FILTERS REPLACED. OZONE FILTERS REPLACED. NO FURTHER ODORS. RTS. (8836562) AIRCRAF
- [SDR QR9R2026090200001](https://openairdocs.org/sdr/QR9R2026090200001.md): Sensor · faulty · Sep 2, 2026 · Bolkms BK117C2
  > GEN SPLIT +10 LOW ON #2. A TEST FLIGHT EVAL FOUND #2 GEN AMPS DISPLAY 10 AMPS IN COCKPIT WHILE AMP CLAMP SHOWS 40 AMPS. REMOVED AND REPLACED SENSOR IAW AMM 24-30-00, 4-6. MOC SUCCESSFULLY COMPLETED.
- [SDR YENA2026090100720](https://openairdocs.org/sdr/YENA2026090100720.md): Generator · warning message · Aug 31, 2026 · N4058J · Airbus A321271NX
  > FLT 1534, SFO-BOS. (ETOPS), AFTER ENG SHUTDOWN MX MSG - AC GEN ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY GPCU OR AC GEN). OPEN
- [SDR YENA2026090100719](https://openairdocs.org/sdr/YENA2026090100719.md): Seal · failed · Aug 29, 2026 · N4083J · Airbus A321271NX
  > FLT # 32, AMS-BOS. (ETOPS), DURING ENG 2 SCHEDULED MX FOUND IDG DRAIN PLUG UNION SEAL DAMAGED, SEAL NOT IN CMM, AMM, EMM; R/R IDG 2 IAW AMM 24-21-51, OPS CHK GOOD.
- [SDR QR9R2026082600003](https://openairdocs.org/sdr/QR9R2026082600003.md): Sensor · out of limits · Aug 26, 2026 · Bolkms BK117C2
  > GEN AMP DIFFERENCE OF 25 AMPS DURING PRE TAKEOFF CHECKS, ENGINES AT FLIGHT. AVIONICS TROUBLESHOT, BUT PROBLEM REMAINED, #2 GEN AMPS READING 25 AMPS LOW. REMOVED AND REPLACED #2 HALL SENSOR IAW AMM 24-30-00, 4-6.
- [SDR 2026F00183](https://openairdocs.org/sdr/2026F00183.md): Idg · faulted · Aug 25, 2026 · N724AV · Airbus A320214
  > AFTER ENGINE 1 START, GEN 1 FAULT ON ECAM RESET UNSUCCESFUL
- [SDR 2026FA0000666](https://openairdocs.org/sdr/2026FA0000666.md): Gcu · intermittent · Aug 24, 2026 · Boeing 73786J
  > DIVERTED FLIGHT TO SLCB IN LEGVVI-LPB FLIGHT 677 DUE TO AC GENERATOR FAIL (FRM 241 010 01 - GEN1 DRIVE LIGHT ILLUMINATED) TOGETHER WITH APU LOW OIL PRESS LIGHT FRM 492 060 00. CORRECTIVE ACTION: PERFORMED FIM 24-11 TASK 801 AND SWAPPED GCU1 WITH GCU2. OPERATIO
- [SDR YENA2026082400701](https://openairdocs.org/sdr/YENA2026082400701.md): Filter · faulted · Aug 24, 2026 · N2156J · Airbus A321271NX
  > FLT 1178, LAS-BOS. (ETOPS) "INSUFFICENT INFO IN TASK CARD A320-24-21-00-920-802-A. FOR ENG 2 IDG DRAIN/FILL W/FILTER REPLACEMENT; C/W W/REF AMM 24-21-51-960-801-A + REMOVED + REPLACED IDG 2 FILTERS + SERVICING. LEAK CK GOOD. THIS ALSO C/W WO 1517593."
- [SDR YENA2026082400698](https://openairdocs.org/sdr/YENA2026082400698.md): Warning Message · activated · Aug 22, 2026 · N2105J · Airbus A321271NX
  > FLT 411, JFK-LAX. (ETOPS) CLASS II AC GEN MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULTS INDICATED BY GPCU OR AC GEN.
- [SDR YENA2026082100695](https://openairdocs.org/sdr/YENA2026082100695.md): Warning Message · illuminated · Aug 19, 2026 · N4064J · Airbus A321271NX
  > FLT # 8583, JFK-MLB. (ETOPS) CLASS II MAINTENANCE MSG AC GEN. OPEN.
- [SDR AALA202608194487](https://openairdocs.org/sdr/AALA202608194487.md): Idg · overheated · Aug 18, 2026 · N187US · Airbus A321211
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INTO ORD DUE TO THE FLIGHT CREW REPORTING THAT THE LEFT ENGINE IDG OIL OVERHEAT MESSAGE DISPLAYED AT CRUISE WHICH RESULTED IN THE FLIGHT CREW DISCONNECTING THE IDG - THE AIRCRAFT LANDED SAFELY AT ORD AND TAXIED
- [SDR YENA2026081700684](https://openairdocs.org/sdr/YENA2026081700684.md): Warning Message · illuminated · Aug 17, 2026 · N4080J · Airbus A321271NX
  > FLT 332, MXP-BOS. (ETOPS) "AC GEN MX MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY GPCU OR AC GEN).
- [SDR YENA2026081700680](https://openairdocs.org/sdr/YENA2026081700680.md): Generator · fault message · Aug 15, 2026 · N2105J · Airbus A321271NX
  > FLT 411, JFK-LAX. (ETOPS) "CLASS II AC GEN MSG AFTER SHUTDOWN ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY GPCU OR AC GEN).
- [SDR AALA202608185715](https://openairdocs.org/sdr/AALA202608185715.md): Sensor · faulted · Aug 14, 2026 · N680AW · Airbus A320232
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO MSP DUE TO THE FLIGHT CREW REPORTING THAT THE LEFT ENGINE IDG FAILED INFLIGHT AND THE FLIGHT CREW RESET THE GENERATOR BUT IT FAILED AGAIN - THE FLIGHT CREW STARTED THAT APU AND 10 MI
- [SDR AALA202608189996](https://openairdocs.org/sdr/AALA202608189996.md): Idg · failed · Aug 14, 2026 · N680AW · Airbus A320232
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO MSP DUE TO THE FLIGHT CREW REPORTING THAT THE LEFT ENGINE IDG FAILED INFLIGHT AND THE FLIGHT CREW RESET THE GENERATOR BUT IT FAILED AGAIN - THE FLIGHT CREW STARTED THAT APU AND 10 MI
- [SDR YENA2026081400669](https://openairdocs.org/sdr/YENA2026081400669.md): Generator · fault message · Aug 12, 2026 · N2105J · Airbus A321271NX
  > FLT 323, JFK-LAX. (ETOPS) "AC GEN CLASS II MX MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY GPCU OR AC GEN)." (SUPPLEMENTAL INFORMATION TO FOLLOW).
- [SDR DXTA2026081409247](https://openairdocs.org/sdr/DXTA2026081409247.md): Idg · failed · Aug 11, 2026 · N228QS · Cndair CL6002B16
  > ON DESCENT, "GEN 2 OFF" CAS MESSAGE DISPLAYED. WE RAN THE QRH AND WERE UNABLE TO GET THE GENERATOR TO COME BACK ONLINE. WHEN THE GEN WENT OFFLINE IT TRIPPED OFF THE STAB TRIM CH1 AND MACH TRIM. THE "AP PITCH TRIM" AND NOSE DOWN TRIM CAS MESSAGES DISPLAYED. THE
- [SDR UIEA2026081100740](https://openairdocs.org/sdr/UIEA2026081100740.md): Tru · faulted · Aug 10, 2026 · N412MC · Boeing 74747UF
  > EICAS MSG "ELEC GEN 3". COMPLIED QRH PROCEDURE(<P>AS A PRECAUTIONARY, R/R TRANSFORMER ASSY T4006 PER AMM 24-23-03/401 & IPC 24-23-03-034. PERF IDLE RUN UP OF #2 & #3 ENGINE IAW AMM 71-00-00/501. OPS CHK OK, ALL INDICATIONS NORMAL AND WITHIN LIMITS. FOUND WIRE
- [SDR ABXA20260803346](https://openairdocs.org/sdr/ABXA20260803346.md): Generator · malfunctioned · Aug 3, 2026 · N227CY · Boeing 767316
  > LEFT GEN OFF WITH LEFT BUS TIE LIGHT / ISLN LIGHT ON WHEN POWER ADVANCED FOR TAKEOFF. A/C ABORTED TAKE OFF (ATO) AND RETURNED TO GATE (BTB). MTC DEFERRED LH GEN IAW ABX MEL 24-00-1-2. GENERATOR DISCONNECTED MX PROCEDURES ACCOMPLISHED. PLACARDS INSTALLED. A/C R
- [SDR YENA2026080300640](https://openairdocs.org/sdr/YENA2026080300640.md): Idg · not reported · Aug 2, 2026 · N2169J · Airbus A321271NX
  > FLT 1534, SFO-BOS. (ETOPS) INSUFFICIENT INFO IN TASK CARD A320-24-21-00-920-802-A FOR ENG 1 IDG DRAIN & FILL, OIL FILTERS REPLACEMENT.; C/W AMM 24-21-51-960-801-A, REMOVED & REPLACED IDG 1 FILTERS, SERVICING.LEAK CHECKED GOOD. THIS ALSO C/W W/O 1513120.
- [SDR ABXA20260727337](https://openairdocs.org/sdr/ABXA20260727337.md): Generator · fault message · Jul 27, 2026 · N764CK · Boeing 7673P6
  > AFTER TAKEOFF CLEARANCE WAS RECEIVED PILOT REQUESTED THRUST/N1 TO BE SET. AT APPROXIMATELY 35 KIAS THE CREW RECEIVED THE R GEN OFF AND BOTH AUX BUS EICAS MESSAGES. THE TAKE OFF WAS REJECTED AND THEY CLEARED THE RUNWAY. QRH CHECKLISTS WERE COMPLETED ALONG WITH
- [SDR YENA2026072700624](https://openairdocs.org/sdr/YENA2026072700624.md): Warning Message · illuminated · Jul 26, 2026 · N4048J · Airbus A321271NX
  > FLT 346, BCN-BOS. (ETOPS) ACFT GEN CLASS II MESSAGE APPEARED AFTER ENGINE SHUTDOWN ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY GPCU OR AC GEN) OPEN.
- [SDR UIEA2026072400646](https://openairdocs.org/sdr/UIEA2026072400646.md): Generator · faulted · Jul 24, 2026 · N454PA · Boeing 74746NF
  > CREW SET UP IAW DDG 49-11-01. CREW ISOLATED THAT LT PNEUMATIC & RT UTILITY. CREW STARTED NR 4 ENG. DURING START, AT THE TIME, NR 4 ENG GOING TO TAKE OVER POWER BY GEN FROM ENGINE. THE ACFT STARTED TO SHED LOAD POWER. THEN LT SIDE WHICH IS POWERED BY LT EXT PO
- [SDR QR9R2026072300002](https://openairdocs.org/sdr/QR9R2026072300002.md): Sensor · fluctuates · Jul 23, 2026 · Bolkms BK117C2
  > AFTER REFUEL, DURING PRE-TAKEOFF CHECK, GENERATOR AMPS WERE NOT WITHIN 10 & STAYED AT 15-20+ WITH THE NR 2 BETWEEN 35-40 AND NR 1 SOLID AT 20. A TEST FLIGHT EVAL SHOWED AFTER START AND IN FLIGHT IDLE, BOTH SIDES INDICATED 28.4V. AMPS WERE 25-30 ON NR 1 AND 40
- [SDR QR9R2026072300001](https://openairdocs.org/sdr/QR9R2026072300001.md): Sensor · faulty · Jul 23, 2026 · Bolkms BK117C2
  > NR 2 GENERATOR AMPS DROPPED TO 5 AMPS DURING RUN-UP. NR 1 SIDE REMAINED STEADY AT 30 AMPS. REMOVED AND REPLACED NR 2 GENERATOR HALL SENSOR IAW 24-30-00, 4-6. T/F MOC SUCCESSFULLY COMPLETED.
- [SDR SWAA2026072358008](https://openairdocs.org/sdr/SWAA2026072358008.md): Idg · warning light · Jul 19, 2026 · N480WN · Boeing 7377H4
  > SOURCE OFF LIGHT AND DRIVE LIGHT ILLUMINATED IN CRUZE PER QRH DISCONNECT SWITCH TO DISCONNECT REMOVED AND REPLACED IDG IAW AMM 24-11-11. OPS CHECK AND LEAK CHECKS GOOD.
- [SDR DALA2026072104276](https://openairdocs.org/sdr/DALA2026072104276.md): Idg · faulted · Jul 18, 2026 · N327DN · Airbus A321213
  > ATB - DUE TO ELEC IDG 2 OIL OVHT ECAM MESSAGE. IDG #2 PLACED ON MEL. OK TO CONTINUE. LATER, REPLACED NBR 2 ENGINE IDG PER A321 AMM 24-21. OPS/LEAK CHECK OK. (LP 8739522 - AIRCRAFT WAS GROUNDED)
- [SDR SIMA20260716003](https://openairdocs.org/sdr/SIMA20260716003.md): Idg · faulted · Jul 16, 2026 · N237NN · Emb ERJ170200LR
  > IDG 2 OFF BUS INDICATION ON EICAS. RAN QRH PROCEDURE UNABLE TO GET IDG2 ONLINE. FLIGHT CREW PLACARD DEFERRED IDG2 OFF BUS INDICATION ON EICAS. RAN QRH PROCEDURE UNABLE TO GET IDG2 ONLINE PER MEL 2405. AUTH#070987D-A EXP# 2FLT-DAY.
- [SDR CALA2026072017891](https://openairdocs.org/sdr/CALA2026072017891.md): Generator · faulted · Jul 15, 2026 · N78003 · Boeing 777224
  > ELEC BACKUP GEN R EICAS STATUS RIGHT BACKUP GENERATOR OFF DUE TO A PROTECTIVE TRIP. DB BACKUP CONVERTER R&R E2 BUG IAW AMM 24-25-01. SECOND QUALIFIED MECHANIC WITNESSED NEW BUG SHAFT PACKING REPLACED. C/W IDT INSPECTION OF BUG FEEDER CABLE INSTALLATION IAW
- [SDR DALA2026072004235](https://openairdocs.org/sdr/DALA2026072004235.md): Generator · leaking · Jul 14, 2026 · N345NB · Airbus A319114
  > STINKY FUMES AFTER APU BLEED SELECTED ON GROUND, NO PAX ON BOARD. DEBRIEFED FLIGHT CREW AS PER TASK CARD 0550-2002 STEPS 1-3. FOUND APU TO BE USED DURING EVENT AND PACK CONFIGURATION TO HAVE NO EFFECT. WIP 780291. C/W STEPS A-E PER MSI PREVENTION LOG 1698152
- [SDR F3LA202607100431](https://openairdocs.org/sdr/F3LA202607100431.md): O-Ring · leaking · Jul 9, 2026 · N630FR · Airbus A321271NX
  > ACFT WAS GROUNDED. DIVERTED TO MCO PER MCC DUE TO OIL QUANTITY LOSS LT ENGINE 14.5 RT ENGINE 20.5 FOR OIL LEAK ON DRAIN MAST IDG HOLE. REMOVED AND REPLACED SHAFT IDG O-RING IAW AMM 24-21-51-000/400-803-A. PERFORMED LEAK CHECK AND OPS TEST. IDG ENG 1 WAS SUC
- [SDR QR9R2026070900001](https://openairdocs.org/sdr/QR9R2026070900001.md): Sensor · fluctuates · Jul 9, 2026 · Bolkms BK117C2
  > GEN NR 1 FAILED DURING REFUEL, GENERATOR AMP NOT WITHIN FIVE. ERRATIC AMP FLUCTUATIONS DURING MTF OF 15 TO 20 AMP DIFFERENCE BETWEEN #1 AND #2 WITH #1 BEING THE FAULT SIDE. #2 WAS STABLE DURING FLIGHT AND VOLTAGE ON BOTH WERE 28.6 STEADY. REMOVED AND REPLACED
- [SDR N6WA2026070806](https://openairdocs.org/sdr/N6WA2026070806.md): Fault Message · illuminated · Jul 7, 2026 · N556GJ · Cndair CL6002C11
  > IDG 1 FAULT 1 MESSAGE (REPEAT). ALREADY ON DEFERRAL PER MEL 24-11-01A CAT A OCN 70102171.
- [SDR N6WA2026070805](https://openairdocs.org/sdr/N6WA2026070805.md): Fault Message · illuminated · Jul 7, 2026 · N556GJ · Cndair CL6002C11
  > IDG 1 FAULT MESSAGE B1-007096, IDG1, INTERNAL FAULT. AS PER TELECON WITH MXC, DEFERRED IDG 1 FAULT MESSAGE ON OCN 70102179 PER MEL 24-11-01A CATEGORY A.
- [SDR AALA202607087645](https://openairdocs.org/sdr/AALA202607087645.md): Generator · faulted · Jul 7, 2026 · N839AA · Boeing 7879
  > AIRCRAFT WAS NOT GROUNDED: AFTER REACHING CRUISE ELEC A/C BUS R1 EICAS APPEARED WITH PROMPTED MANY OTHER FAILURES ASSOCIATED WITH POWER LOSS. FLIGHT RETURNED TO LAX FOR MAINTENANCE. EMERGENCY WAS DECLARED AND AIRCRAFT WAS OVERWEIGHT FOR LANDING. MAINTENANCE RE
- [SDR DALA2026070603928](https://openairdocs.org/sdr/DALA2026070603928.md): Idg · leaking · Jul 4, 2026 · N870DN · Boeing 737932ER
  > DIVERTED TO RDU DUE TO LEFT ENGINE GENERATOR FAIL AND SUBSEQUENT APU AUTO SHUTDOWN. FOUND LT IDG OIL COOLER LINE LEAKING. REPLACED LINE AND LT IDG. LEAK AND OPS CHECK GOOD. NO FAULTS ON APU AND OPS CHECK GOOD. (7985735) AIRCRAFT WAS GROUNDED
- [SDR ABXA20260629290](https://openairdocs.org/sdr/ABXA20260629290.md): Gcu · defective · Jun 29, 2026 · N493MM · Boeing 767300
  > ON TAXI OUT, R GEN OFF EICAS MESSAGE APPEARED WITHIN 1-2 SECONDS OF TAKEOFF POWER APPLICATION. A/C ABORTED TAKE OFF (ATO) AND RETURNED TO GATE (BTB). MTX GROUNDED A/C AND TROUBLESHOT. REMOVED AND REPLACED R/H GCU IAW AMM 24-22-02. OPS CHECK GOOD. PERFORMED IDL

Next page: https://openairdocs.org/jasc/2421/reports.md?page=2

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
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
```

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. This list as a web page: https://openairdocs.org/jasc/2421/reports