# JASC 2460: DC Power Distribution System

- Type: JASC system/component code (FAA)
- ATA chapter: 24 Electrical Power
- Title in the code table: DC POWER/DISTRIBUTION SYSTEM
- Service difficulty reports: 608
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=21
- Page: https://openairdocs.org/jasc/2460

## What it covers

The electrical system which provides for connection of DC power to using systems. Does not include using system. Typical parts are main and secondary system buss, circuit breaker, buss tie breaker, limiter, jumper, load motor switch, etc.

## Service difficulty reports (608, newest 50)

- [SDR SWIA2026061576242](https://openairdocs.org/sdr/SWIA2026061576242), Jun 15, 2026: Cndair CL6002C11. TRU. FAULTED. DC BUSS 2 CAUTION MESSAGE. SMELLED A BURNING ODOR FOR ABOUT A MINUTE BEFORE GOING AWAY. MULTIPLE ASSOCIATED FAILURES INC (N751EV)
- [SDR VNAA2026061619002](https://openairdocs.org/sdr/VNAA2026061619002), Jun 14, 2026: Cndair CL6002D24. DIODE. FAULTED. DC EMERGENCY BUSS CAUTION MSG IN FLIGHT. REMOVED AND REPLACED EMERGENCY BUSS DIODE (CR82) IAW AMM 24-61-01-000-400-801-A (N589NN)
- [SDR QXEA2026040800082](https://openairdocs.org/sdr/QXEA2026040800082), Apr 3, 2026: Emb ERJ170200LR. COMPUTER. DAMAGED. DURING ECMP FOR APU START CONTACTOR REPLACEMENT ARCING DAMAGE OCCURRED ON LOWER AFT AICC CASE AND LOWER BUS BAR HARDWARE (N653QX)
- [SDR U5QA202602020166](https://openairdocs.org/sdr/U5QA202602020166), Feb 2, 2026: Bombdr BD1001A10. DCPC. FAILED. CREW REPORTS A CYAN ELECTRICAL FAULT FOLLOWED BY BATTERIES AND GENERATORS DROPPING OFFLINE. THE ELECTRICAL PANEL KEPT FL (N545XJ)
- [SDR AALA202512080080](https://openairdocs.org/sdr/AALA202512080080), Dec 6, 2025: Airbus A319132. TRANS RECTIFIER. FAULTED. AIRCRAFT WAS GROUNDED: DCA-ORD AIR INTERRUPTED BACK TO DCA ACCOUNT DC ESSENTIAL BUS FAULT. FLIGHT DID NOT DECLARE AN EME (N803AW)
- [SDR AALA202509223255](https://openairdocs.org/sdr/AALA202509223255), Sep 18, 2025: Boeing 777223. RELAY. FAULTED. AIRCRAFT WAS GROUNDED: AIR INTERRUPT FOR THE FOLLOWING: CABIN ALT AUTO L, ASCP PRIMARY CTRL L, WARNING SPEAKER L, STALL  (N770AN)
- [SDR MASA2025060200044](https://openairdocs.org/sdr/MASA2025060200044), Jun 2, 2025: Emb ERJ170200LR. POWER UNIT. FAULTED. SPDA 2 FAULT. REMOVED AND REPLACED SPDA SLOT 12 MICRO COMSS MODULE. OPS CHECK GOOD. NO DEFECTS NOTED. (N85340)
- [SDR QR9R2025050100001](https://openairdocs.org/sdr/QR9R2025050100001), May 1, 2025: Bolkms BK117C2. RELAY. FAULTY. MULTIPLE ABORTED STARTS #1 ENGINE (NO RISE TOT). REMOVED AND REPLACED ENGINE IGNITOR RELAY IAW AMM 24-60-00, 4-1. TEST P
- [SDR QXEA2025042200122](https://openairdocs.org/sdr/QXEA2025042200122), Apr 21, 2025: Emb ERJ170200LR. SPDA. FAULTED. FLIGHT 2100. ON DESCENT TO DESTINATION 29000FT SPDA FAIL DISPLAYED ON EICAS. ELECTED TO RETURN TO ORIGINAL AIRPORT AND A (N650QX)
- [SDR IPXA2025031297716](https://openairdocs.org/sdr/IPXA2025031297716), Mar 12, 2025: Doug MD11F. POWER SUPPLY. NO TEST. EMERGENCY POWER TEST FAIL DURING PREFLIGHT FOUND AMMETER NEGATIVE C/B B1-1004 OPEN WHEN CLOSED. R&R PERF SWPM 20-60. OPS (N263UP)
- [SDR HEEA202501200002](https://openairdocs.org/sdr/HEEA202501200002), Jan 17, 2025: Bolkms BK117D2EURO. RELAY. INOPERATIVE. #1 AND #2 BUS TIE OPEN LIGHT CAME ON IN FLIGHT. (N343PH)
- [SDR HEEA202501130001](https://openairdocs.org/sdr/HEEA202501130001), Jan 10, 2025: Bolkms BK117D2EURO. RELAY. INOPERATIVE. #1 AND #2 BUS TIE OPEN LIGHT CAME ON IN FLIGHT. (N343PH)
- [SDR SWIA202501130](https://openairdocs.org/sdr/SWIA202501130), Jan 10, 2025: Cndair CL6002B19. ELECTRICAL SYS. POWER LOSS. COMPLETE LOSS OF AC POWER IN FLIGHT. ADG DEPLOYED AUTOMATICALLY. POWER LOSS OCCURRED WHILE SELECTING FLAPS 8. RAN QRC/QR (N466SW)
- [SDR 6CBA2024121824001](https://openairdocs.org/sdr/6CBA2024121824001), Dec 16, 2024: Pilats PC1247E. JUNCTION BOX. FAULTY. DURING A FLIGHT FROM KBED TO KPHL, THE FLIGHT CREW REPORTED A DU3 FAILURE WITH AN ASSOCIATED STANDBY BUS CAS MESSAGE. TH (N916AF)
- [SDR DXTA2024121601529](https://openairdocs.org/sdr/DXTA2024121601529), Dec 14, 2024: Bombdr BD1001A10. CONTROLLER. DEFECTIVE. ELECTRICAL FAULT CYAN CAS: AFTER DEPARTURE CYAN CAS ELECTRICAL FAULT, WHITE CAS LEFT AND RIGHT BATTERIES OFFLINE AND LEF (N779QS)
- [SDR QR9R2024102200001](https://openairdocs.org/sdr/QR9R2024102200001), Oct 22, 2024: Bolkms BK117C2. INTERFACE UNIT. ILLUMINATED. ACTUATOR CAUTION LIGHT ILLUMINATED ON CAD; ATTEMPTED AN ELECTRICAL SYSTEM RESET. ACTUATOR LIGHT INITIALLY WENT OUT BUT C
- [SDR 2024F00252](https://openairdocs.org/sdr/2024F00252), Oct 13, 2024: Gulstm GVI. ELECTRICAL SYS. FAULTED. RIGHT POWER DISTRIBUTION BUS DC OVERHEAT AND EMERGENCY BUS FAULT DURING FLIGHT. FOUND LOOSE GROUND TERMINALS AT STUD 270 (N999YY)
- [SDR HNAA2024101400961](https://openairdocs.org/sdr/HNAA2024101400961), Oct 11, 2024: Emb EMB145LR. RELAY. FAULTED. STRONG ELECTRICAL SMELL COMING FROM AROUND L/H DC DISTRIBUTION BOX WITH NOTICABLE TEMP RISE NEAR BOX. R&R #3 FEEDER RELA (N657AE)
- [SDR YENA2024100701334](https://openairdocs.org/sdr/YENA2024100701334), Oct 2, 2024: Emb ERJ190100IGW. TRU. FAILED. FLT#484, RDU-BOS. (AIRCRAFT DECLARED AN EMERGENCY INTO BOS). 'MULTIPLE EICAS MESSAGES ON 20 MILE FINAL. DC BUS 2 OFF AVN (N274JB)
- [SDR U5QA202405160129](https://openairdocs.org/sdr/U5QA202405160129), May 16, 2024: Bombdr BD1001A10. PCB. FAILED. ON DESCENT, WE HAD RIGHT ESSENTIAL BUSS FAILURE AND RIGHT BATTERY OFF. WE ASKED FOR VECTORS TO A VISUAL RUNWAY DUE TO EL (N340JE)
- [SDR MASA2024051500047](https://openairdocs.org/sdr/MASA2024051500047), May 15, 2024: Emb ERJ170200LR. BUSS. UNSECURE. AC/DC BUS 1 FAILED IN FLIGHT (RTF EMERGENCY DECLARED)/CORRECTIVE ACTION: R/R IDG 1, GCU 1. TIGHTENED LICC TB5-2 DC ESS B (N82338)
- [SDR 2024F00131](https://openairdocs.org/sdr/2024F00131), Feb 24, 2024: Bombdr BD1001A10. CONTROL PANEL. FAULTY. THE CREW EXPERIENCED AN VOLTAGE DROP TO BELOW 23.5 VOLTS ON MULTIPLE FLIGHTS TRIGGERING THE GEN #1 FAIL CAS MESSAGE. DIS (N945AC)
- [SDR QR9R2024010800001](https://openairdocs.org/sdr/QR9R2024010800001), Jan 8, 2024: Bolkms BK117C2. TRANSFORMER. FAILED. DURING FLIGHT, APMS SPLIT BETWEEN 10 AND 35 AMPS WITH #2 ALWAYS GOING LOW. DURING THE SPLIT #1 NEVER INDICATED AN INCREA
- [SDR DALA2023090507179](https://openairdocs.org/sdr/DALA2023090507179), Sep 4, 2023: Airbus A319114. UNKNOWN. UNKNOWN. SHIP 3152 - ATB - DUE TO ELEC DC ESS BUS SHED ECAM MESSAGE WITH NUMEROUS ECAM WARNING MESSAGES. CORRECTIVE ACTION: FOUND (N352NB)
- [SDR AALA202301179609](https://openairdocs.org/sdr/AALA202301179609), Jan 16, 2023: Airbus A321231. CONTACTOR. DEFECTIVE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO CLT DUE TO THE FLIGHT CREW REPORTING ON TA (N975UY)
- [SDR VNAA202211081111](https://openairdocs.org/sdr/VNAA202211081111), Nov 4, 2022: Cndair CL6002C10. NONE. UNSERVICEABLE. DC ESS BUS CAUTION MESSAGE IN FLIGHT FOUND CBP-2 R6 POPPED (DC ESS FEED) / REMOVED AND REPLACED LH DCPC IAW CRJ 700 AMM 
- [SDR AALA202210173501](https://openairdocs.org/sdr/AALA202210173501), Oct 14, 2022: Boeing 737. CIRCUIT CARD. FAILED. AIRCRAFT WAS GROUNDED: STANDBY DC FEED CIRCUIT BREAKER TRIPPED. NO SMOKE OR FUMES. CAUSED MULTIPLE FAILURES. AIRCRAFT DI (N823AN)
- [SDR AALA202210179264](https://openairdocs.org/sdr/AALA202210179264), Oct 14, 2022: Boeing 737. DRIVE UNIT. FAILED. AIRCRAFT WAS GROUNDED: STANDBY DC FEED CIRCUIT BREAKER TRIPPED. NO SMOKE OR FUMES. CAUSED MULTIPLE FAILURES. AIRCRAFT DI (N823AN)
- [SDR AALA202210179898](https://openairdocs.org/sdr/AALA202210179898), Oct 14, 2022: Boeing 737. MODULE. FAILED. AIRCRAFT WAS GROUNDED: STANDBY DC FEED CIRCUIT BREAKER TRIPPED. NO SMOKE OR FUMES. CAUSED MULTIPLE FAILURES. AIRCRAFT DI (N823AN)
- [SDR 2022F00381](https://openairdocs.org/sdr/2022F00381), Sep 29, 2022: Agusta AW119MKII. MAGNETOMETER. FAILED. AIRCRAFT HAS BURNT ELECTRICAL SMELL THROUGHOUT COCKPIT AND CABIN. AIRCRAFT WAS AT 3500 FT MSL STARTED DECENT, SMELL GOT  (N352LL)
- [SDR QR9R20220518001](https://openairdocs.org/sdr/QR9R20220518001), May 18, 2022: Bolkms BK117C2. TRANSFORMER. FLUCTUATES. ON TAKE-OFF, THE AMMETER BEGAN FLUCTUATING BETWEEN 15 AND 30 AMPS CAUSING THE AP 1 TO FAIL. TEST FLIGHT EVALUATION REVEA
- [SDR MASA2022050500134](https://openairdocs.org/sdr/MASA2022050500134), May 5, 2022: Emb ERJ170200LR. NONE. NONE. SDPA FAIL ADV/ BURNT WIRE SMELL. ACFT IS STILL OOS IN OKC. (N93305)
- [SDR DALA2022032902082](https://openairdocs.org/sdr/DALA2022032902082), Mar 29, 2022: Boeing 717200. CIRCUIT BREAKER. TRIPPED. SHIP 9525 - THE CREW DIVERTED THE AIRCRAFT TO CLT AFTER THE LOSS OF THE RT DC BUSS AT CRUISING ALTITUDE. THE #4 AND #5 S (N966AT)
- [SDR QXEA2022022200097](https://openairdocs.org/sdr/QXEA2022022200097), Feb 19, 2022: Bombdr DHC8402. NONE. NONE. RAMP REPORTS "ELECTRICAL SMELL" NOTED WHEN UNPLUGGING GPU AFTER POWERING AIRCRAFT DOWN. REMOVED FROM SERVICE. PERFORMED  (N400QX)
- [SDR QR9R20220112001](https://openairdocs.org/sdr/QR9R20220112001), Jan 12, 2022: Bolkms BK117C2. TRANSFORMER. FAULTY. DURING RUN UP, # 2 GEN AMP SPLIT 30 AMPS FROM THE #1 WHEN LANDING LIGHT WAS ACTIVATED. REPLACED #2 TRANSFORMATOR IAW AMM
- [SDR SIMA20211016003](https://openairdocs.org/sdr/SIMA20211016003), Oct 16, 2021: Emb EMB145LR. NONE. NONE. ON APPROACH DUE TO DUAL GENERATOR FAIL AND APU DEFFERRED. NO GEN 1 OR GEN 4 OFF BUS EICAS MESSAGES PRESENTED QRH ABORT N (N612AE)
- [SDR QR9R20211012007](https://openairdocs.org/sdr/QR9R20211012007), Oct 12, 2021: Bolkms BK117C2. NONE. OUT OF LIMITS. DURING FLIGHT, GENERATOR AMP SPLIT OF 20 -25 AMPS. #1 GENERATOR READS 10 AMPS; #2 GENERATOR READS BETWEEN 35 AND 40 AMPS
- [SDR QR9R20211012005](https://openairdocs.org/sdr/QR9R20211012005), Oct 12, 2021: Bolkms BK117C2. NONE. OUT OF LIMITS. AIRCRAFT AMPS OUT OF LIMITS BETWEEN NUMBER ONE AND NUMBER TWO GENERATOR. DURING TROUBLESHOOTING OF AMP SPLIT, FOUND #1 G
- [SDR QR9R20211012003](https://openairdocs.org/sdr/QR9R20211012003), Oct 12, 2021: Bolkms BK117C2. TOGGLE. FAULTY. ON RUN UP, HYDRAULIC TEST SWITCH "S-2 AND HOLD" DOES NOT FUNCTION. TEST FLIGHT MOC CONFIRMS HYDRAULICS CHECK S2 DOES NOT
- [SDR WX0A2021081373809](https://openairdocs.org/sdr/WX0A2021081373809), Aug 11, 2021: Airbus A320214. WARNING LIGHT. FALSE ACTIVATION. ELEC DC ESS BUS SHED ECAM FOUR TIMES IN FLIGHT. EMERGENCY CANCELLED AFTER COMPLETING ECAM, QRH, FCOM PROCEDURES. / PERFO (N243NV)
- [SDR AALA202104119017](https://openairdocs.org/sdr/AALA202104119017), Apr 10, 2021: Boeing 7378. CONTROL UNIT. FAILED. AIRCRAFT WAS GROUNDED: ON CLIMB FROM DCA, DC FAIL LIGHT CAME ON RIGHT ADIRU SIDE. THE FIRST OFFICER SMELLED A FAINT ELEC (N342RX)
- [SDR HKGA20210307001](https://openairdocs.org/sdr/HKGA20210307001), Mar 6, 2021: Emb EMB120ER. BUSS. FAILED. EMPTY LEG REPOSITION FLIGHT FROM KYIP TO KCAK. CLIMBING THROUGH 14,000' AFTER DEPARTING KYIP THE EMERGENCY DC BUS #2 FAI (N233SW)
- [SDR 2021FA0000044](https://openairdocs.org/sdr/2021FA0000044), Feb 14, 2021: Boeing 7378. ELECTRICAL BOX. FAILED. WHILE ACCOMPLISHING WORK CARD 09C20025005, FOUND EMA AT SEAT 1AB TO BE NOT WORKING FOR THE INFLATABLE SEATBELTS. RAR EMA (N315SD)
- [SDR VNAA202102151111](https://openairdocs.org/sdr/VNAA202102151111), Feb 11, 2021: Cndair CL6002C10. CONTROLLER. FAILED. IDG FAILED INFLIGHT (DAY-CLT) AFTER TO. RETURNED TO FIELD. AFTER TAKEOFF,THE FO SIDE ELECTRICAL FAILURED. NO PRESSURIZAT (N528EG)
- [SDR R61A2021020300139](https://openairdocs.org/sdr/R61A2021020300139), Jan 22, 2021: Emb ERJ170100SU. EFB. INOPERATIVE. FLIGHT DECK EFB CHARGING SYSTEM INSTALL PER 170EO-24-61-0003_1. COMPLIED WITH INSTALL PER JOB CARD R170EO-24-61-0003_1. (N874RW)
- [SDR QXEA2020122300361](https://openairdocs.org/sdr/QXEA2020122300361), Dec 22, 2020: Emb ERJ170200LR. MODULE. MALFUNCTIONED. SPDA FAIL MESSAGE CYAN COLOR CRUISE FL 34, RAN QRH RETURNED TO FIELD, LANDING UNEVENTFUL. REMOVED FROM SERVICE.UPON ARRI (N635QX)
- [SDR KC8A20201130002](https://openairdocs.org/sdr/KC8A20201130002), Nov 23, 2020: Lear 35A. CIRCUIT BREAKER. TRIPPED. AIRCRAFT EXPERIENCED PARTIAL ELECTRICAL POWER LOSS. CREW WERE PERFORMING TRAINING ON RETURN LEG FROM KTEB OVER ATC APPRO (N73CK)
- [SDR MTNA20201118001](https://openairdocs.org/sdr/MTNA20201118001), Nov 18, 2020: Aerosp ATR72212. MFC. FAULTED. DURING CLIMB AFTER LANDING GEAR RETRACTION THE MASTER CAUTION ON THE CAP ANNUNCIATED NR 2 DC GENERATOR FAULTED. AFTER CL (N820FX)
- [SDR AALA2020090849014](https://openairdocs.org/sdr/AALA2020090849014), Sep 3, 2020: Airbus A319112. CONTACTOR. INOPERATIVE. AIRCRAFT WAS GROUNDED: AFTER TAKEOFF, GOT ECAM ELEC DC ESS BUS SHED. CLEARED ON ITS OWN. LATER FLIGHT ATTENDANT CALLS AN (N177XF)
- [SDR J7SA20200526001](https://openairdocs.org/sdr/J7SA20200526001), May 26, 2020: Emb EMB545. CONTROLLER. ODOR. WHILE TROUBLESHOOTING APU FAIL CAS MESSAGE, DISCOVERED BURNT EPDC #2 EMITTING AN ELECTRICAL SMELL. UPON ACCESS PANEL REM (N427FX)

All 608: https://openairdocs.org/jasc/2460/reports.md

## Other codes in chapter 24

- [JASC 2400](https://openairdocs.org/jasc/2400): Electrical Power System (1,186 reports)
- [JASC 2410](https://openairdocs.org/jasc/2410): Alternator-Generator Drive (891 reports)
- [JASC 2420](https://openairdocs.org/jasc/2420): AC Generation System (1,302 reports)
- [JASC 2421](https://openairdocs.org/jasc/2421): AC Generator-Alternator (4,273 reports)
- [JASC 2422](https://openairdocs.org/jasc/2422): AC Inverter (557 reports)
- [JASC 2423](https://openairdocs.org/jasc/2423): Phase Adapter (15 reports)
- [JASC 2424](https://openairdocs.org/jasc/2424): AC Regulator (480 reports)
- [JASC 2425](https://openairdocs.org/jasc/2425): AC Indicating System (137 reports)
- [JASC 2430](https://openairdocs.org/jasc/2430): DC Generating System (1,120 reports)
- [JASC 2431](https://openairdocs.org/jasc/2431): Battery Overheat Warning System (82 reports)
- [JASC 2432](https://openairdocs.org/jasc/2432): Battery/Charger System (2,249 reports)
- [JASC 2433](https://openairdocs.org/jasc/2433): DC Rectifier/Converter (197 reports)
- [JASC 2434](https://openairdocs.org/jasc/2434): DC Generator-Alternator (849 reports)
- [JASC 2435](https://openairdocs.org/jasc/2435): Starter-Generator (2,052 reports)
- [JASC 2436](https://openairdocs.org/jasc/2436): DC Regulator (313 reports)
- [JASC 2437](https://openairdocs.org/jasc/2437): DC Indicating System (98 reports)
- [JASC 2440](https://openairdocs.org/jasc/2440): External Power System (169 reports)
- [JASC 2450](https://openairdocs.org/jasc/2450): AC Power Distribution System (872 reports)
- [JASC 2497](https://openairdocs.org/jasc/2497): Electrical Power System Wiring (2,202 reports)

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