# JASC 2436: DC Regulator

- Type: JASC system/component code (FAA)
- ATA chapter: 24 Electrical Power
- Title in the code table: DC REGULATOR
- Service difficulty reports: 313
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=21
- Page: https://openairdocs.org/jasc/2436

## What it covers

The component that regulates direct current voltage from a generator or alternator.

## Service difficulty reports (313, newest 50)

- [SDR 2026FA0000400](https://openairdocs.org/sdr/2026FA0000400), May 10, 2026: Bolkms BK117C2. GCU. FAILED. #1 GENERATOR DISCONNECT LIGHT DISPLAYED ON CAD. CONFIRMED LOSS OF GENERATOR. RESET ATTEMPTS FAILED. ABORTED FLIGHT AS ME (N440SF)
- [SDR 2026FA0000368](https://openairdocs.org/sdr/2026FA0000368), May 10, 2026: Bolkms BK117C2. GCU. FAILED. NR 1 GENERATOR DISCONNECT DISPLAYED ON THE CAD. RESET GENERATOR TO NO AVIAL. DUE TO MEL RESTRICTIONS OF DAY VFR ONLY FLI (N440SF)
- [SDR 2026FA0000367](https://openairdocs.org/sdr/2026FA0000367), May 10, 2026: Bolkms BK117C2. GCU. FAILED. NR 1 GENERATOR DISCONNECT ON THE CAD. RESET ATTEMPTED AND STILL DISCONNECTED. PATIENT FLIGHT ABORTED DUE TO MEL RESTRICT (N440SF)
- [SDR 2026FA0000366](https://openairdocs.org/sdr/2026FA0000366), May 10, 2026: Bolkms BK117C2. GCU. FAILED. NR 1 GENERATOR DISCONNECT ON THE CAD. RESET ATTEMPTED AND STILL DISCONNECTED. PATIENT FLIGHT ABORTED DUE TO MEL RESTRICT (N440SF)
- [SDR 2026FA0000365](https://openairdocs.org/sdr/2026FA0000365), May 10, 2026: Bolkms BK117C2. GCU. FAILED. NR 1 GENERATOR DISCONNECT ON THE CAD. RESET ATTEMPTED AND STILL DISCONNECTED. PATIENT FLIGHT ABORTED DUE TO MEL RESTRICT (N440SF)
- [SDR 2025FA0000791](https://openairdocs.org/sdr/2025FA0000791), Aug 24, 2025: Cessna 150L. VOLT REGULATOR. DEFECTIVE. VOLTAGE REGULATOR FAILURE IN FLIGHT RESULTED IN OVERVOLTAGE CONDITION. CAUSED BATTERY OVERHEATING/SWELLING AND COMMUNICA (N18KK)
- [SDR QMLA2024021320017](https://openairdocs.org/sdr/QMLA2024021320017), Feb 6, 2024: Pilats PC1245. VOLT REGULATOR. FAILED. DUAL GENERATOR FAILURE WHEN HEATS/LIGHTS TURNED ON (N129JW)
- [SDR JIKA2020050142901](https://openairdocs.org/sdr/JIKA2020050142901), Apr 29, 2020: Frchld SA227CC. CURRENT LIMITER. BLOWN. ABOUT 15 MINUTES PRIOR TO ARRIVAL TO KLAN FROM KPLN, THE ELECTRICAL INSTRUMENTS STARTED SURGING AND OCCASIONALLY THE COM (N709TR)
- [SDR 2019FA0000308](https://openairdocs.org/sdr/2019FA0000308), Aug 30, 2019: Piper PA28180. VOLT REGULATOR. INTERMITTENT. CUSTOMER COMPLAINED THAT ALTERNATOR WOULD QUIT CHARGING AFTER APPROXIMATELY 20 MINUTE FLIGHT. CONDUCTED TEST FLIGHT OF A (N16EC)
- [SDR YV3R2019021100011](https://openairdocs.org/sdr/YV3R2019021100011), Jan 31, 2019: Robsin R44RAVENII. CONTROL UNIT. MALFUNCTIONED. CUSTOMER REPORTED HE WAS UNABLE TO ADJUST SYSTEM VOLTAGE WITH THE ALTERNATOR CONTROL UNIT. (N4043P)
- [SDR JIKA2016082901](https://openairdocs.org/sdr/JIKA2016082901), Aug 29, 2016: Piper PA31350. VOLT REGULATOR. SHORTED. ON CLIMB OUT, THE PILOT REPORTED THAT THE LT ALTERNATOR AMPS WENT TO ZERO AND THE RT ALTERNATOR ILLUMINATED. THE PILOT R (N35336)
- [SDR CA151016003](https://openairdocs.org/sdr/CA151016003), Oct 13, 2015: Beech A100. VOLT REGULATOR. FAILED. (CAN) ON ACFT SHORT COMING IN TESTING PROCEDURES WAS DISCOVERED WHILE FOLLOWING THE MM FOR THE ADJUSTMENT OF THE VOLTAGE
- [SDR HMGR2015FA0000278](https://openairdocs.org/sdr/HMGR2015FA0000278), Jun 19, 2015: Beech 35C33A. VOLT REGULATOR. SHORTED. OVERVOLTAGE WARNING LIGHT ILLUMINATED. INSTALLED THE VOLTAGE REGULATOR, STARTED ENGINE, SWITCHED ON ELECTRICAL SYSTEM, W
- [SDR CA150508002](https://openairdocs.org/sdr/CA150508002), May 5, 2015: Gulstm 690. VOLT REGULATOR. FAILED. (CAN) AIRCRAFT VOLTAGE ON NR 2 ENG WAS ABOVE 30 VOLTS, KICKING EITHER THE LT OR THE RT GENERATOR OFFLINE. NR 2 VOLTAGE R
- [SDR QMLA2014102114123](https://openairdocs.org/sdr/QMLA2014102114123), Oct 21, 2014: Snias AS350B3. CIRCUIT CARD. UNSERVICEABLE. GENERATOR ADVISER LIGHT ILLUMINATED WITH DECLINING VOLTAGE. Z1 VOLTAGE REGULATOR CARD REMOVED, TIME SINCE REPAIR 10HRS 5 (N904CF)
- [SDR CA140930004](https://openairdocs.org/sdr/CA140930004), Sep 26, 2014: Dhav DHC2MKI. VOLT REGULATOR. OVERHEATED. (CAN) IMMEDIATELY AFTER DEPARTING A STRONG BURNING ODOR WAS NOTICED IN THE AIRCRAFT. AIRCRAFT RETURNED TO BASE, WHERE MA
- [SDR SFOA20130506001](https://openairdocs.org/sdr/SFOA20130506001), Apr 29, 2013: Cessna 550. CURRENT LIMITER. FAILED. UPON INITIATING START OF THE LT ENGINE, NOTHING HAPPENED. NONE OF THE LT ENGINE INSTRUMENTS HAD POWER AND THERE WERE SEV (N57SF)
- [SDR NX4R2013020600035](https://openairdocs.org/sdr/NX4R2013020600035), Feb 5, 2013: Diamon DA42. REGULATOR. LOOSE. DOUBLE ALTERNATOR FAILURE. RT ALTERNATOR SPIKED TO 37.5 VOLTS THEN RED X'D. ABOUT 10 SECONDS LATER THE LT ALTERNATOR DID (N903ER)
- [SDR RI9A20120617001](https://openairdocs.org/sdr/RI9A20120617001), Jun 6, 2012: Bnorm BN2A26. REGULATOR. MALFUNCTIONED. PILOT SMELLED ODOR AND SAW SMOKE FROM INSTRUMENT PANEL. PILOT RETURNED TO KODIAK AIRPORT WITHOUT INCIDENT AND MADE A NOR (N5891V)
- [SDR CA120509003](https://openairdocs.org/sdr/CA120509003), May 5, 2012: Emb ERJ190100IGW. SPDA. FAILED. (CAN) SPDA2 FAIL APPROXIMATELY. DIVERSION FOR MAINTENANCE. NORMAL DESCENT/APPROACH AND NO REQUIREMENT TO DECLARE PAN PAN
- [SDR BSYA2011031](https://openairdocs.org/sdr/BSYA2011031), Aug 30, 2011: Beech 58. REGULATOR. MALFUNCTIONED. SHORTLY AFTER DEPARTING OUT OF TEB RIGHT ALTERNATOR SPIKED AND KNOCKED BOTH COMM'S OFF LINE. TURNED POWER OFF THEN ON AN (N1653W)
- [SDR CA110204009](https://openairdocs.org/sdr/CA110204009), Jan 31, 2011: Bell 204B. VOLT REGULATOR. FAILED. DURING CRUISE FLIGHT THE PILOT NOTICED THE AMMETER FLUCTUATE AND THE GENERATOR LIGHT FLICKER. THE PILOT BEGAN TO DESCEND
- [SDR BSYA2010046](https://openairdocs.org/sdr/BSYA2010046), Nov 24, 2010: Beech 58. VOLT REGULATOR. INTERMITTENT. ENROUTE, EXPERIENCED DUAL ALTERNATOR FAILURE SHORTLY BEFORE ARRIVING, LANDED NO PROBLEM. R & R BOTH VOLTAGE REGULATORS,  (N36901)
- [SDR CA100914007](https://openairdocs.org/sdr/CA100914007), Sep 2, 2010: Dhav DHC2MKI. VOLT REGULATOR. FAILED. O/H VOLTAGE REGULATOR INSTALLED FOR ACFT TESTING. VOLTAGE REGULATOR OVERCHARGING, FAULT = NO RESISTANCE AT FIELD CONNECT
- [SDR BSYA2010027](https://openairdocs.org/sdr/BSYA2010027), May 24, 2010: Beech 58. VOLT REGULATOR. FAILED. AFTER DEPARTING, BOTH ALTERNATORS FAILED ON NR 2 VOLTAGE REGULATOR, RETURNED TO DEPARTURE AIRPORT. R & R NR 2 VOLTAGE RE (N17708)
- [SDR CA091021010](https://openairdocs.org/sdr/CA091021010), Oct 16, 2009: Cessna 172N. VOLT REGULATOR. FAILED. (CAN) CREW REPORTED ALTERNATOR NOT CHARGING AFTER ENGINE START-UP. ENGINE SHUT DOWN. TROUBLESHOOTING INDICATED VOLTAGE R
- [SDR BSYA2009045](https://openairdocs.org/sdr/BSYA2009045), Aug 26, 2009: Lear 35A. VOLT REGULATOR. FAULTY. EN ROUTE FROM TEB TO CPS LEFT GENERATOR KEPT FALLING OFF LINE, PILOT THEN DIVERTED INTO LCK. REMOVED AND REPLACED LEFT V (N27TT)
- [SDR CA090331007](https://openairdocs.org/sdr/CA090331007), Mar 25, 2009: Cessna 172P. REGULATOR. FAILED. (CAN) ALTERNATOR QUIT CHARGING - REPLACED VOLTAGE REGULATOR AND THAT FIXED IT.
- [SDR AC2A2008102278763](https://openairdocs.org/sdr/AC2A2008102278763), Oct 22, 2008: Bell 430. VOLT REGULATOR. INOPERATIVE. AFTER RESETTING THE NR 2 GENERATOR FOR 3 TIMES IT WAS DETERMINED THAT THE VOLTAGE REGULATOR WAS THE PROBLEM. (N430CM)
- [SDR CA080916007](https://openairdocs.org/sdr/CA080916007), Jul 28, 2008: Cessna U206G. VOLT REGULATOR. SHORTED. (CAN) ACFT WAS IN CRUISE FLIGHT WHEN THE PILOT NOTICED THE ELECTRICAL SYSTEM WAS DRAINING THE BATTERY. THE ACFT LANDED A
- [SDR I5HA041108001](https://openairdocs.org/sdr/I5HA041108001), Apr 11, 2008: Cvac 580. VOLT REGULATOR. OUT OF ADJUST. AFTER CLIMB OUT, THE CREW LOST THE NR1 DC GENERATOR. AS A PRECAUTIONARY MEASURE THEY RETURNED TO DEPARTURE FOR MAINT TO  (N585P)
- [SDR CA080121007](https://openairdocs.org/sdr/CA080121007), Jan 16, 2008: Boeing 727225. VOLT REGULATOR. ODOR. (CAN) DURING FLIGHT CREW SHUTDOWN CHECKLIST, ON APU POWER, SMOKE ALARM SOUNDED IN THE AC LAVATORY. LAVATORY INSP REVEALE
- [SDR SWIA200616776](https://openairdocs.org/sdr/SWIA200616776), Jun 6, 2006: Emb EMB120ER. GCU. MALFUNCTIONED. AFTER APU SHUTDOWN SMOKE FILLED THE COCKPIT. REPLACED APU GCU. REPLACED APU STARTER/GEN AND REPLACED FEEDER PROTECTION R (N564SW)
- [SDR 2006FA0000532](https://openairdocs.org/sdr/2006FA0000532), May 21, 2006: Piper PA18. CURRENT LIMITER. FAILED. CURRENT LIMITER BLOWN, CAUSING LOSS OF ELECTRICAL POWER. (N203T)
- [SDR KBM2006F00149](https://openairdocs.org/sdr/KBM2006F00149), Apr 3, 2006: Bell 206B. REGULATOR. INOPERATIVE. AC BATTERY LOW POWER, REMOVED AND REPLACED. REGULATOR MALFUNCTIONED, REMOVED AND REPLACED. (K) (N188TV)
- [SDR ALG2006F00035](https://openairdocs.org/sdr/ALG2006F00035), Mar 31, 2006: Bell 214ST. CURRENT LIMITER. INOPERATIVE. IN FLIGHT, EN ROUTE, THE FOLLOWING INDICATION WENT TO (0). NR 1 NG, NR 1 ENG PRESS, TEMP, C-BOX PRESS, NR 1 HYD PRESS, N (N392AL)
- [SDR 06FDEA0813](https://openairdocs.org/sdr/06FDEA0813), Feb 23, 2006: Airbus A300*. GCU. FAULTY. PDIS 682 24-30 0004948 22FEB06 MEM CLOSE R LOGPAGES: 01107636 GEN NR1 FAULT AFTER TAKEOFF WOULD NOT RESET. APU WAS INOP  (N682FE)
- [SDR ALG2006F00007](https://openairdocs.org/sdr/ALG2006F00007), Jan 24, 2006: Bell 206L4. VOLT REGULATOR. MALFUNCTIONED. GENERATOR FAIL LIGHT ILLUMINATED ON TAKEOFF. ATTEMPTED RESET AND SMELLED ACRID BURNING SMELL. LANDED AIRCRAFT AT THE NEA (N173AL)
- [SDR ALG2005F00084](https://openairdocs.org/sdr/ALG2005F00084), Oct 21, 2005: Bell 206B. VOLT REGULATOR. FAILED. IN CRUISE FLIGHT, BATTERY TEMP LIGHT ILLUMINATED. BATTERY SWITCH WAS TURNED OFF IAW EMERGENCY PROCEDURES. BATTERY HOT LI (N116AL)
- [SDR 2006FA0000085](https://openairdocs.org/sdr/2006FA0000085), Oct 13, 2005: Mooney M20M. VOLT REGULATOR. FAILED. COMBINATION VOLTAGE AND OVERVOLTAGE REGULATOR FAILED. THIS FAILURE CAUSED A VOLTAGE SPIKE IN THE ELECTRICAL SYSTEM WHICH (N9145X)
- [SDR RAIA00508007](https://openairdocs.org/sdr/RAIA00508007), Aug 5, 2005: Jetair JETSTM4101. GCU. MALFUNCTIONED. FLT 5437 - STL - LEFT GENERATOR FAILURE INDICATION. MAINTENANCE REMOVED AND REPLACED NR 1 GENERATOR CONTROL UNIT. (N569HK)
- [SDR MALA050401](https://openairdocs.org/sdr/MALA050401), May 5, 2005: Saab 340B. GCU. FAILED. AFTER DEPARTING FROM DTW, THE RIGHT HAND DC GENERATOR FELL OFF LINE. CREW FOLLOWED QRH TO TRY AND RESET IT, AND IT WOULD (N444XJ)
- [SDR 2005FA0000602](https://openairdocs.org/sdr/2005FA0000602), Apr 13, 2005: Grob G120A. VOLT REGULATOR. INOPERATIVE. AFTER 20 MINUTES INTO ENGINE, START CHARGING SYSTEM STILL SHOWING 7 AMPS OF CHARGING. MAINT TECH FOUND VLOTAGE REGULATOR (N864AF)
- [SDR MAC5402](https://openairdocs.org/sdr/MAC5402), Apr 5, 2005: Fokker F27MK500. VOLT REGULATOR. FAILED. NR 2 GENERATOR DROPPED OFFLINE DURING CLIMBOUT. (N716FE)
- [SDR CA050308019](https://openairdocs.org/sdr/CA050308019), Mar 7, 2005: Piper PA31T. REGULATOR. WORN. (CAN) DURING CLIMB OUT, THE RT GENERATOR FAILED AND THE AIRCRAFT RETURNED TO THE AIRPORT. A RUN UP WAS CARRIED OUT AND I
- [SDR RAIA00409022](https://openairdocs.org/sdr/RAIA00409022), Sep 23, 2004: Jetair JETSTM4101. GCU. FAILED. STL - LEFT ENGINE GENERATOR DROPPED OFF LINE DURING TAXI. MAINTENANCE REMOVED AND REPLACED GCU. (N564HK)
- [SDR BIER200401059](https://openairdocs.org/sdr/BIER200401059), Mar 12, 2004: Beech 58. VOLT REGULATOR. FAILED. SMELLED SMOKE IN COCKPIT, CIRCUIT BREAKER POPPED, SHUT-DOWN ALL POWER TO AIRCRAFT. FOUND OVERVOLTAGE CIRCUIT DID NOT DIS (N1859)
- [SDR 2004F00037](https://openairdocs.org/sdr/2004F00037), Jan 13, 2004: Swrngn SA227AC. GCU. FAILED. WHILE ON THE TAKEOFF ROLL, THE LT GENERATOR FAIL WARNING LIGHT ILLUMINATED. THE TAKEOFF WAS ABORTED AND MAINTENANCE WAS  (N371PH)
- [SDR BAQA091971](https://openairdocs.org/sdr/BAQA091971), Dec 26, 2003: Aerosp AS365N2. VOLT REGULATOR. FAILED. VOLTAGE REGULATOR WILL NOT CONTROL VOLTAGE OF GENERATOR. REPLACED WITH SERVICEABLE UNIT. 01/14/2004 (N915ME)
- [SDR AUS20031220](https://openairdocs.org/sdr/AUS20031220), Nov 17, 2003: Dhav DHC8202. GCU. FAULTY. (AUS) NR 1 DC GENERATOR AND GCU SUSPECT FAULTY.

All 313: https://openairdocs.org/jasc/2436/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 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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