# JASC 2430: DC Generating System

- Type: JASC system/component code (FAA)
- ATA chapter: 24 Electrical Power
- Title in the code table: DC GENERATING SYSTEM
- Service difficulty reports: 1,120
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=20
- Page: https://openairdocs.org/jasc/2430

## What it covers

The system parts and circuitry other than the generator/alternator and DC generation system regulator used to generate a direct current (DC); or from an alternator, the output of which is rectified to DC. Typical parts are relay, switch, connector, terminal, sensor, reverse current relay, etc. Such systems are more prevalent on light single and twin-engine aircraft.

## Service difficulty reports (1,120, newest 50)

- [SDR 2026FA0000743](https://openairdocs.org/sdr/2026FA0000743), Sep 18, 2026: Piper PA28181. POWER CABLE. BROKEN. THE RING TERMINAL ON THE OUTPUT TERMINAL OF THE ALTERNATOR BREAKS OFF, AFTER BREAKING THE TWO PARTS OF THE RING TERMINAL (N789ND)
- [SDR CVGA20260917003](https://openairdocs.org/sdr/CVGA20260917003), Sep 13, 2026: Emb EMB505. GCU. FAILED. RECEIVED A BATT EXCEEDANCE CAS MESSAGE DURING CLIMB, MOMENTARARY A FEW TIMES, THEN STEADY. GENERATOR AND BATTERY 1 VOLTA (N897JH)
- [SDR DXTA2026090809572](https://openairdocs.org/sdr/DXTA2026090809572), Sep 5, 2026: Cessna 680A. GENERATOR. FAILED. SHORT FINAL, STARTED APU FOR GROUND COOLING PAX COMFORT. AS SOON AS WE STARTED THE APU WE GOT WINDSHIELD HEAT INOP L AND (N640QS)
- [SDR QR9R2026090300002](https://openairdocs.org/sdr/QR9R2026090300002), Sep 3, 2026: Bolkms BK117C2. GCU. FAILED. ON APPROACH, GEN DISCON ON CAD AND GEN AMPS DROPPED TO 0.0 ON SYSTEM #2. TROUBLESHOOTING CONFIRMED THE #2 GCU TO BE BAD.
- [SDR QR9R2026081200001](https://openairdocs.org/sdr/QR9R2026081200001), Aug 12, 2026: Bolkms BK117C2. GCU. FAULTED. #2 GEN DISCON CAUTION APPEARED AFTER BOTH ENGINES WERE STARTED, ZERO AMPS ON NR 2. REMOVED AND REPLACED NR 2 GCU IAW 24-
- [SDR QR9R2026070800001](https://openairdocs.org/sdr/QR9R2026070800001), Jul 8, 2026: Bolkms BK117C2. GCU. FAILED. GEN NR 2 DISCONNECT ON THE GROUND DURING STUDENT CHANGE AND COULD NOT BE RESET. BEFORE THE FAILURE, LOAD BALANCE WAS 15 
- [SDR HNAA2026042200343](https://openairdocs.org/sdr/HNAA2026042200343), Apr 20, 2026: Emb EMB145LR. BATTERY. INOPERATIVE. BKUP BATT OFF BUS NEVER CLEARED IN FLIGHT, (CREW) RAN QRH, MSG NEVER CLEARED. R&R BACKUP BATTERY IRT AMM 24-35-01. NO FI (N662EH)
- [SDR QR9R2026041300001](https://openairdocs.org/sdr/QR9R2026041300001), Apr 13, 2026: Bolkms BK117C2. GCU. FAULTED. GEN DISCON CAUTION LIGHT INTERMITTENT ILLUMINATION DURING HOVER TAXI, NO OTHER INDICATION. GEN OUTPUT WITHIN NORMAL PARA
- [SDR HYIA20260424002](https://openairdocs.org/sdr/HYIA20260424002), Apr 11, 2026: Tecnam P2012. BELT. FAILED. PILOT REPORTED LEFT AND RIGHT ALTERNATOR FAILURES IN FLIGHT. MAINTENANCE INSPECTED AND FOUND FOUND BOTH ALTERNATOR BELTS (N288CA)
- [SDR 141A2026032600001](https://openairdocs.org/sdr/141A2026032600001), Mar 26, 2026: Cessna 208B. GENERATOR. FAULTED. DURING CLIMB OUT OF HNL, GEN AMPS AND STBY POWER ON ANNUNCIATORS BOTH ILLUMINATED INTERMITTENTLY. GEN AND ALTERNATOR AMP (N852MA)
- [SDR G41A2026032300207](https://openairdocs.org/sdr/G41A2026032300207), Mar 21, 2026: Lear 60LEAR. GENERATOR. FAILED. DEPARTING KAUS HEADING TO KSTL WHEN THE CREW NOTICED THE LH GENERATOR LIGHT ON AND THE AMP OUTPUT WAS ZERO. THEY ELECTED (N415SG)
- [SDR 2026FA0000148](https://openairdocs.org/sdr/2026FA0000148), Feb 27, 2026: Amd FALCON7X. GENERATOR. FAILED. PIREP: N369CA SN 087 DEPARTED KHOU TO KIAD. DURING AIRCRAFT CLIMB THE PILOT IDENTIFIED AN AMBER CAS MESSAGE. "ELEC: GEN  (N369CA)
- [SDR QR9R2026022700001](https://openairdocs.org/sdr/QR9R2026022700001), Feb 27, 2026: Bolkms BK117C2. GCU. FAILED. GEN 2 DISCONNECT AT IDLE; MAINTENANCE WAS UNABLE TO RESET. A TEST FLIGHT EVAL REVEALED #2 GENERATOR FAILED TO COME ONLIN
- [SDR CWQA20260306001](https://openairdocs.org/sdr/CWQA20260306001), Feb 2, 2026: Emb EMB135BJ. BEARING. FAILED. DURING CRUISE CREW RECEIVED GEN 4 OFF BUS AND GEN4 BRG FAIL MESSAGES. CREW FOLLOWED CHECKLIST AND SUBSEQUENT LANDING PER (N993JC)
- [SDR DXTA2026012806661](https://openairdocs.org/sdr/DXTA2026012806661), Jan 24, 2026: Emb EMB505. STARTER GEN. FAULTY. WHILE IN CRUISE A GEN 1 OFF CAS APPEARED. WHILE STARTING TO WORK THROUGH QRH, STARTED GETTING A RAPIDLY CHANGING LIST OF (N478QS)
- [SDR DXTA2026011206487](https://openairdocs.org/sdr/DXTA2026011206487), Jan 8, 2026: Cessna 680A. PCB. FAULTY. THE LT DC GEN OFF L AMBER CAS MESS APPEARED RIGHT AT ABOUT 90-100 KTS ON TAKE OFF ROLL, ARES DATA SENT TO TEXTRON ON 1/8 (N679QS)
- [SDR AALA202512230138](https://openairdocs.org/sdr/AALA202512230138), Dec 19, 2025: Airbus A321231. COFFEEMAKER. ODOR. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW DUE TO THE FLIGHT CREW REPORTING THAT  (N913US)
- [SDR QXEA2025120200360](https://openairdocs.org/sdr/QXEA2025120200360), Dec 1, 2025: Emb ERJ170200LR. SWITCH. OUT OF POSITION. FLIGHT 2032. TRU 1 FAIL AT JET BRIDGE ON GPU DURING TAKEOFF ROLL. REJECTED TAKEOFF AT 65 KNOTS. REMOVED FROM SERVICE. FO (N665QX)
- [SDR CALA2025112511455](https://openairdocs.org/sdr/CALA2025112511455), Nov 23, 2025: Boeing 767322. OVEN. DIRTY. FAS REPORTED FUMES IN REAR OF AIRCRAFT 10 MINS INTO FLIGHT. 4 6 PERSONNEL PUT ON O2CREW DEBRIEF CARRIED OUT, FORM 46-602 (N665UA)
- [SDR AALA202511240617](https://openairdocs.org/sdr/AALA202511240617), Nov 23, 2025: Airbus A321231. COFFEEMAKER. LEAKING. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO IAH DUE TO THE FLIGHT CREW REPORTING THAT  (N139AN)
- [SDR DXTA2025111105645](https://openairdocs.org/sdr/DXTA2025111105645), Nov 10, 2025: Emb EMB505. CONTACTOR. FAULTED. REPEAT WRITE UP ON APPROACH TO LANDING IN KYIP WE RECEIVED GEN 1 OFF BUS YELLOW CAS ACCOMPANIED BY SHED BUS OFF. PLACED  (N343QS)
- [SDR KCSA2025110861](https://openairdocs.org/sdr/KCSA2025110861), Nov 8, 2025: Boeing 7474B5F. TRANS RECTIFIER. INOPERATIVE. 100281155: MULTIPLE ELECTRICAL FAILURES. ACTION TAKEN: T/S & FOUND DC 1 DIST P6 C/B POPPED IAW B747 WDM 24-54-12. REMOVE (N716CK)
- [SDR SWAA2025110531911](https://openairdocs.org/sdr/SWAA2025110531911), Nov 4, 2025: Boeing 7378. CONTROL UNIT. FAULTED. BATTERY BUSS SECT 2 CIRCUIT BREAKER TRIPPED AT 38;000. BOTH PACK LIGHTS ILLUMINATED, STBY POWER OFF LIGHT, NR 2 REVERSER (N8918Q)
- [SDR J7SA2025111900462](https://openairdocs.org/sdr/J7SA2025111900462), Nov 3, 2025: Emb EMB550. GENERATOR. FAILED. GENERATOR 1 FAILED AT FL430 AFTER LANDING AT KPRB. ENGINE 1 LOST ALL OIL. REPLACED FAILED LH GENERATOR. REPLACED DAMAGED (N600FX)
- [SDR DXTA2025102105362](https://openairdocs.org/sdr/DXTA2025102105362), Oct 18, 2025: Textrn TEXTRON700. PCB. FAULTY. DURING DESCENT YELLOW CAS MESSAGE, "ELEC EMER L," DISPLAYED. SEVERAL MINUTES LATER YELLOW CAS MESSAGE, "BATTERY DISCHARG (N830QS)
- [SDR NACA2025093000003](https://openairdocs.org/sdr/NACA2025093000003), Sep 30, 2025: Boeing 76733A. CONTROL UNIT. FAULTED. BUSS POWER CONTROL UNIT HAS A FAULT MESSAGE IDG / OIL OUT. PERFORMED BPCU BITE PROCEDURE PER B-767 FIM 24-30 FAULT TREE  (N567NC)
- [SDR QR9R2025082600002](https://openairdocs.org/sdr/QR9R2025082600002), Aug 26, 2025: Bolkms BK117C2. GCU. FAILED. GEN DISCON ON #1 SIDE APPROXIMATELY 10 MINUTES INTO FLIGHT. REMOVED AND REPLACED #1 ENG GCU IAW AMM 24-30-00, 4-1.
- [SDR KY7A202508250038](https://openairdocs.org/sdr/KY7A202508250038), Aug 21, 2025: Swrngn SA226TC. CONTROL UNIT. NOT REPORTED. REPLACED RH GENERATOR CONTROL UNIT C0303 P# 51509-002B SN 15239A (N425MA)
- [SDR ASAA2025081260077](https://openairdocs.org/sdr/ASAA2025081260077), Aug 12, 2025: Boeing 7379. CONTROL PANEL. ARCED. ON THE GROUND ILLUMINATION OF TR & MAINT LIGHT ON APU BUS, DISCONNECTED GROUND PWR, 60 SECONDS LATER LOST ALL POWER, LOS (N974AK)
- [SDR CALA2025071706673](https://openairdocs.org/sdr/CALA2025071706673), Jul 14, 2025: Boeing 737824. STATIC INVERTER. FAULTED. REJECTED T/O DURING T/O ELEC LIGHT ILLUMINATED. PER FLT CREW VIA DISPATCH, RTO AT 30 KTS. STATIC INVERTER WAS REPLACED T (N33294)
- [SDR AJXA2025071600032](https://openairdocs.org/sdr/AJXA2025071600032), Jul 12, 2025: Cessna 750. GCU. UNSERVICEABLE. DURING FLIGHT AT FL450 AIRCRAFT LOST POWER ON EICAS DISPLAY UNITS, 1 ,2, AND 3 CAUSED DUE TO A POWER LOSS ON THE NR 1 PO (N225GT)
- [SDR DXTA2025070304100](https://openairdocs.org/sdr/DXTA2025070304100), Jun 30, 2025: Emb EMB505. CONTROL PANEL. FAULTED. DEPARTING KTYQ, RECEIVED AN EMER LT NOT ARM CAS MESSAGED AT 400FT EVEN THOUGH THEY WERE ARMED & NOTICED BOTH BATTERIES W (N330QS)
- [SDR DXTA2025062003962](https://openairdocs.org/sdr/DXTA2025062003962), Jun 18, 2025: Cndair CL6002B16. CIRCUIT BREAKER. FAILED. IN CRUISE CREW NOTICED A FAINT ELECTRICAL BURNING SCENT. THE SCENT ABATED QUICKLY BEFORE CREW COULD DETERMINE WHERE IT O (N249QS)
- [SDR J7SA2025061100448](https://openairdocs.org/sdr/J7SA2025061100448), May 29, 2025: Emb EMB550. GENERATOR. FAULTED. DIVERTED DUE TO GEN 1 OFF BUS CAS APPROXIMATELY 2.5 HOURS INTO A FLIGHT FROM KSFO TO KPHL. CREW FOLLOWED QRH, DESCENDED  (N601FX)
- [SDR QR9R2025052000002](https://openairdocs.org/sdr/QR9R2025052000002), May 20, 2025: Bolkms BK117C2. GCU. INOPERATIVE. GEN DISCONNECT 1 CAUTION LIGHT ILLUMINATED DURING START RUN-UP. GENERATOR 1 INOP AFTER BOTH ENG START UP. REMOVED AND RE
- [SDR QR9R2025031700002](https://openairdocs.org/sdr/QR9R2025031700002), Mar 17, 2025: Bolkms BK117C2. GCU. DISCONNECTED. DURING RUN-UP THE #2 GEN DISC CAUTION APPEARED. THE GEN CB ON THE #1 ESS BUS POPPED; WOULD NOT RESET. DURING TEST FLIGHT
- [SDR E07A2025030600154](https://openairdocs.org/sdr/E07A2025030600154), Mar 2, 2025: Emb EMB505. GENERATOR. FAILED. DUAL GENERATOR FAILURE AT FL 430. EMERGENCY DECENT, AIRCRAFT WENT INTO ELECTRICAL EMERGENCY. PRESSURIZATION LOSS, O2 MAS (N301AS)
- [SDR 2025FA0000004](https://openairdocs.org/sdr/2025FA0000004), Jan 3, 2025: Cessna 172G. ALTERNATOR. FAILED. THE AL:EMATO, PN 15-1014, SN H•V060493, THIS ALTERNAOR, CAME APART IN FLIGHT ON 10/27/2024. THE ONLY INDICATION OF THE F
- [SDR F3LA202412250172](https://openairdocs.org/sdr/F3LA202412250172), Dec 24, 2024: Airbus A320251N. FUSE. FAILED. ACFT WAS TAKEN OUT OF SERVICE FOR THIS EVENT. REFERENCE LOG PAGE LP464308 ITEM 2, ELEC DC ESS BUS SHED. REPLACED FUSE 20 (N341FR)
- [SDR 2024FA0000968](https://openairdocs.org/sdr/2024FA0000968), Dec 15, 2024: Lear 60LEAR. GENERATOR. WORN. ON 12/15/2024, N317MP, CYO317, DEPARTED KSNA REPOSITIONING TO KELP AND APPROXIMATELY ONE HOUR INTO THE FLIGHT, THE RH SI (N317MP)
- [SDR QR9R2024111300001](https://openairdocs.org/sdr/QR9R2024111300001), Nov 13, 2024: Bolkms BK117C2. GCU. DISCONNECTED. DURING FLIGHT, #2 GEN DISCONNECT AND WOULD NOT RESET. REMOVED AND REPLACED #2 GCU IAW AMM 24-30-00, 4-1. T/P MOC COMPLET
- [SDR 7C7A2024111200009](https://openairdocs.org/sdr/7C7A2024111200009), Nov 10, 2024: Dhav DHC8106. GENERATOR. WARNING LIGHT. #2 DC GEN CAUTION LIGHT ILLUMINATED. RESET FAILED. (N885EA)
- [SDR SIMA20241011002](https://openairdocs.org/sdr/SIMA20241011002), Oct 11, 2024: Emb ERJ170200LR. GCU. FAILED. IDG 2 OFF BUS APU FAIL (DC ESS 2) ENTRE. EMERGENCY DECLARED. DIVR MIA. MTX INSPCT RAR MAIN GENERATOR CONTROL UNIT #2 IAW (N249NN)
- [SDR QR9R2024101000003](https://openairdocs.org/sdr/QR9R2024101000003), Oct 10, 2024: Bolkms BK117C2. GCU. DISCONNECTED. #1 GEN DISCONNECT WHILE IN FLIGHT. ATTEMPTED BUS TIE AND RESET; #1 GEN DISCONNECT REMAINED AND GEN 2 PICKED UP LOAD. DUR
- [SDR QR9R2024100100002](https://openairdocs.org/sdr/QR9R2024100100002), Oct 1, 2024: Bolkms BK117C2. GCU. ILLUMINATED. #1 GEN DISCONNECT CAUTION LIGHT ILLUMINATED ON START RUN-UP, #1 GEN WOULD NOT RESET. REMOVED AND REPLACED #1 GCU IAW AMM
- [SDR QR9R2024060300001](https://openairdocs.org/sdr/QR9R2024060300001), Jun 3, 2024: Bolkms BK117C2. GCU. WARNING MESSAGE. GEN DISCON SYS 2 CAUTION APPEARED IN FLIGHT. TROUBLESHOT IAW THE CHECKLIST, BUT CAUTION REMAINED. GEN AMPS ON #2 WAS REA
- [SDR DBCA202405250003](https://openairdocs.org/sdr/DBCA202405250003), May 25, 2024: Pilats PC24. PCU. FAILED. ON TAKEOFF FROM IAD UMS DATABASE FAIL INDICATION RECEIVED. CREW ABORTED TAKEOFF AND RETURNED TO FBO. MTN CONTACTED PILAT (N274AH)
- [SDR HYIA20240524003](https://openairdocs.org/sdr/HYIA20240524003), May 20, 2024: Cessna 402C. NUT. EXCESS PLAY. UPON REMOVAL OF AN ALTERNATOR FOR AN INTERNAL OIL LEAK, THE HUB NUT WAS FOUND TO BE LOOSE, ALLOWING THE THRUST WASHER TO (N2611X)
- [SDR HYIA20240524002](https://openairdocs.org/sdr/HYIA20240524002), May 20, 2024: Cessna 402C. NUT. EXCESS PLAY. UPON REMOVAL OF AN ALTERNATOR, THE HUB NUT WAS FOUND TO BE LOOSE, ALLOWING THE THRUST WASHER TO ROTATE BY HAND. THE COTT (N256CA)
- [SDR HYIA20240524001](https://openairdocs.org/sdr/HYIA20240524001), May 19, 2024: Tecnam P2012. BELT. LOOSE. PILOT REPORTED RIGHT ALTERNATOR CIRCUIT BREAKER POPPED WHICH RESULTED IN COMPLETE ELECTRICAL FAILURE, EMERGENCY BATTER W (N357CA)

All 1,120: https://openairdocs.org/jasc/2430/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 (4,272 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 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 2460](https://openairdocs.org/jasc/2460): DC Power Distribution System (608 reports)
- [JASC 2497](https://openairdocs.org/jasc/2497): Electrical Power System Wiring (2,202 reports)

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