# JASC 7497: Ignition System Wiring

- Type: JASC system/component code (FAA)
- ATA chapter: 74 Ignition
- Title in the code table: IGNITION SYSTEM WIRING
- Service difficulty reports: 97
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=64
- Page: https://openairdocs.org/jasc/7497

## What it covers

For reports indicating a problem with wiring specific to the Ignition System.

## Service difficulty reports (97, newest 50)

- [SDR 2026FA0000309](https://openairdocs.org/sdr/2026FA0000309), Apr 30, 2026: CONTACT. MISMANUFACTURED. PARTS NEW OUT OF THE BAG WILL NOT CLOSE LIKE THEY ARE SUPPOSED TO. THESE ARE MAGNETO CONTACT POINTS AND SHOULD FIRMLY CL
- [SDR 2026FA0000040](https://openairdocs.org/sdr/2026FA0000040), Dec 2, 2025: Parten P68C. IGNITION LEAD. OPEN. DURING ENGINE RUN UP PRE MAINTENANCE MECHANIC NOTICED AN EXCESSIVE MAG DROP ON RT ENGINE LT MAG. CHECKED PLUGS AND MAG T (N170WL)
- [SDR NACA2025101000004](https://openairdocs.org/sdr/NACA2025101000004), Oct 10, 2025: Boeing 76733A. CABLE. CRACKED. NR 2 ENG LOWER IGNITION EXCITER CABLE BUSHING UNDER CERAMIC SLEEVE CRACKED. DOT 048200. REMOVED AND REPLACED NR 2 ENG LO (N567NC)
- [SDR YENA2025090500912](https://openairdocs.org/sdr/YENA2025090500912), Sep 4, 2025: Airbus A321271NX. IGNITION LEAD. DAMAGED. FLT#1621, LHR-BOS. (ETOPS) L1 TSI - ENG 1 IGN A FAULT, APPROVAL REQUIRED FOR RESOLUTION, DUE TO PREVIOUS ENGINE 1 IGNITI (N4022J)
- [SDR 2025FA0000512](https://openairdocs.org/sdr/2025FA0000512), Jul 23, 2025: Cirrus SR22T. WIRE HARNESS. FAILED INSP. PILOT OBSERVED #4 CYLINDER TEMPERATURE INDICATING IN THE RED. MADE AN UNSCHEDULED LANDING AT KBOI. LOCAL FBO PERFORMED T (N822R)
- [SDR NACA2025051100001](https://openairdocs.org/sdr/NACA2025051100001), May 11, 2025: Boeing 7673BG. FEEDER CABLE. DAMAGED. FOUND TOP EXCITER TO IGNITER CABLE ON #1 ENGINE IGNITER END DAMAGED. REPLACED #1 ENGINE EXCITER TO IGNITER PLUG CABLE IA (N565NC)
- [SDR HNAA2024032800235](https://openairdocs.org/sdr/HNAA2024032800235), Mar 27, 2024: Emb EMB145LR. WIRE HARNESS. DAMAGED. #2 ENG HUNG START WITH HEAVY FUEL SMELL (ONLY 0N FADEC 2A). MEL 28MAR24 06:10 RIC B08803 74-1 IGNITION SYSTEM CHANNELS.  (N647AE)
- [SDR HALA20240205033](https://openairdocs.org/sdr/HALA20240205033), Feb 2, 2024: Airbus A330243. IGNITION LEAD. ARCED. ETOPS - WHILE WORKING TSI FOR ENG 2 IGN FAULT SAW ARCING AT 4002EH2 IGNITION LEAD. REMOVED IGNITION LEAD PER AMM 74-21-5 (N379HA)
- [SDR 2023F00282](https://openairdocs.org/sdr/2023F00282), Sep 16, 2023: Bnorm BN2B21. WIRE. BROKEN. RIGHT HAND MAGNETO OFF LIGHT ILLUMINATED ON RIGHT HAND MVP-50P ENGINE INSTRUMENT DISPLAY. PILOT RETURNED TO AIRPORT, LAN (N801SA)
- [SDR ASAA2023091245121](https://openairdocs.org/sdr/ASAA2023091245121), Sep 12, 2023: Boeing 737890. IGNITION LEAD. UNKNOWN. #1 ENGINE HAD NO IGNITION, OTHER INDICATIONS NORMAL. GROUNDED - YES. (RESOLVED ON W/O: 1968107 TASKCARD: N/R-00002 ) REP (N559AS)
- [SDR ASAA2023012841711](https://openairdocs.org/sdr/ASAA2023012841711), Jan 28, 2023: Boeing 737890. LEAD. INOPERATIVE. DURING START OF ENGINE #2, HAD NO LIGHTOFF, SECURED ENGINE PER QRC/QRH. RAMP REPORTED SMALL FUEL PUDDLE UNDER #2 COWL. S (N530AS)
- [SDR ABXA20221001106](https://openairdocs.org/sdr/ABXA20221001106), Oct 1, 2022: Boeing 767231. LEAD. FAULTED. 2 FAILED START ATTEMPTS ON LEFT ENGINE W/IGNITION IN BOTH. 3RD ATTEMPT STARTED L ENGINE USING #1 IGNITION. AIRCRAFT BACK (N650GT)
- [SDR ASAA2021082635794](https://openairdocs.org/sdr/ASAA2021082635794), Aug 26, 2021: Boeing 737990ER. LEAD. DAMAGED. #2 ENGINE, LEFT IGNITION LEAD, BRAIDED CONDUIT DAMAGED, BRAID DAMAGED. GROUNDED - YES. REMOVED AND REPLACED #2 ENGINE LE (N472AS)
- [SDR 9JLA2021082017373](https://openairdocs.org/sdr/9JLA2021082017373), Aug 18, 2021: Cessna 560XL. RELAY. FAILED. THE FLIGHT CREW REPORTED THE LEFT ENGINE IGNITORS WOULD NOT TURN OFF. THE MAINTENANCE TEAM DETERMINED THAT THE KZ051 REL (N563CS)
- [SDR UIEA2021032100666](https://openairdocs.org/sdr/UIEA2021032100666), Mar 23, 2021: Boeing 7673S1. LEAD. DAMAGED. ENG #2 UPPER HI TENSION LEAD DAMAGED(<P>REMOVED AND REPLACED #2 ENG UPPER HI TENSION LEAD IAW B767-300 AMM 74-21-01 NOTE (N640GT)
- [SDR UIEA2021031200526](https://openairdocs.org/sdr/UIEA2021031200526), Mar 11, 2021: Boeing 7673Y0. CABLE. DAMAGED. LEFT ENGINE #2 IGNITION INOP ( IGNITION SYSTEMS, EXCEPT ER OPERATIONS (NOTIFY DISPATCH) (R60) )(<P>PARTS NOT TO BE RECEI (N1619A)
- [SDR I5PA2021010375701](https://openairdocs.org/sdr/I5PA2021010375701), Jan 3, 2021: Boeing 75729J. LEAD. BURNED. REF NRC CARD NO 001. FOUND ON A8 CHECK RIGHT ENGINE UPPER IGNITER LEAD CERAMIC BURNT OR MELTED. REMOVED AND REPLACED RIG (N757QM)
- [SDR ASAA2020091833196](https://openairdocs.org/sdr/ASAA2020091833196), Sep 18, 2020: Boeing 737890. CONNECTOR. MELTED. NR 1 ENG NO START AFTER 2 ATTEMPTS ON RT IGNITION. GOOD ROTATION, GOOD FF, NO IGNITION. GROUNDED-YES. PERFORMED IGNITION (N569AS)
- [SDR ASAA2020022852299](https://openairdocs.org/sdr/ASAA2020022852299), Feb 25, 2020: Airbus A321253N. CONNECTOR. OUT OF POSITION. ENGINE 1 IGN A FAULT DURING START GROUNDED - YES. CW IGN TEST IAW AMM 74-00-00-710-803-A, BOTH CHAN A/B TEST OK #1 ENG . (N929VA)
- [SDR UIEA2020012200109](https://openairdocs.org/sdr/UIEA2020012200109), Jan 21, 2020: Boeing 76738E. WIRE. DAMAGED. RIGHT ENGINE IGNITOR 1 WAS INOPERATIVE. REMOVED AND REPLACED THE IGNITER PLUG NR 1 IAW AMM 74-21-02, NO HELP. REMOVED AN (N641GT)
- [SDR ASAA201912091510](https://openairdocs.org/sdr/ASAA201912091510), Dec 3, 2019: Airbus A321253N. WIRE HARNESS. FAULTED. ENGINE #1 IGN A FAULT DURING START UP. AFTER THIRD START ATTEMPT ITS STARTED BUT DISPLAYED ENG 1 START FAULT AND ENG 1 I (N929VA)
- [SDR KY7A201912052001](https://openairdocs.org/sdr/KY7A201912052001), Dec 2, 2019: Swrngn SA227AC. WIRE. BROKEN. PILOT REPORTED PARTIAL POWER LOSS IN FLIGHT, PILOT ACTIVATED CONTINUOUS IGNITION WHICH RESTORED POWER. AUTO IGNITION DID (N31171)
- [SDR ASAA2019110231228](https://openairdocs.org/sdr/ASAA2019110231228), Nov 2, 2019: Boeing 737890. CONNECTOR. DEFECTIVE. #1 ENG ING C/B "R" POPPED. GROUNDED - YES. FOUND CONNECTOR D30064 PIN 1 SHORTED TO GND WHEN SIDE LOADED. FOUND CONNECTOR (N597AS)
- [SDR UIEA201910225760](https://openairdocs.org/sdr/UIEA201910225760), Oct 20, 2019: Boeing 76736N. LEAD. FAULTED. ITEM 1: STATUS MSG L ENGINE IGNITER 1.&NBSP; ITEM 2: INFO ONLY - NO LIGHTOFF L ENG, FIRST START USED BOTH IGNITERS. 2ND  (N1093A)
- [SDR AWKA2019080501](https://openairdocs.org/sdr/AWKA2019080501), Jul 31, 2019: Bombdr BD1001A10. LEAD. UNSECURE. ABOUT AN HOUR OUT FROM LANDING WHILE CRUISING AT FL450, THE RIGHT ENGINE ROLLED BACK AND SHUT DOWN WITHOUT ANY COMPONENT (N551XJ)
- [SDR UIEA2019061074434](https://openairdocs.org/sdr/UIEA2019061074434), Jun 7, 2019: Boeing 767306. CONNECTOR. CORRODED. NR 1 ENG IGNITION BOXES HAVE CORROSION ON CANNON PLUG CONNECTION RECEPTACLES. REMOVED AND REPLACED BOTH IGNITION EXCITER (N1409A)
- [SDR UIEA2019032203628](https://openairdocs.org/sdr/UIEA2019032203628), Mar 21, 2019: Boeing 76733A. WIRE. DAMAGED. "R ENG IGNITOR 2" STATUS MESSAGE.(<P>TRANSFERRED TO DMI 109050, MEL 74-00-01B. CAT: C, DUE 31MAR19. MCC NOTIFIED &AMP; P (N1997A)
- [SDR ASAA2019021268150](https://openairdocs.org/sdr/ASAA2019021268150), Feb 6, 2019: Boeing 737890. CONNECTOR. FAILED. #1 ENG DOES NOT SHOW EGT INDICATION ON ENGINE START. GROUNDED - YES. SWAPPED IGNITION BOXES - RIGHT C/B CONTINUES TO POP (N597AS)
- [SDR FQAR20180919050](https://openairdocs.org/sdr/FQAR20180919050), Sep 18, 2018: Piper PA28181. WIRE. DETERIORATED. DURING A SCHEDULED INSPECTION, FOUND THE POWER WIRE FOR THE START BADLY DETERIORATED WITH NUMEROUS BARE SECTIONS OF WIRE (N416PA)
- [SDR FQAR20180919049](https://openairdocs.org/sdr/FQAR20180919049), Sep 18, 2018: Piper PA28181. WIRE. DETERIORATED. DURING A SCHEDULED INSPECTION, FOUND THE POWER WIRE FOR THE START BADLY DETERIORATED WITH NUMEROUS BARE SECTIONS OF WIRE (N443PA)
- [SDR CA180723009](https://openairdocs.org/sdr/CA180723009), Jul 19, 2018: Bombdr DHC8400. WIRE HARNESS. ARCED. (CAN) NR 1 ENGINE FADEC REPORTS CODE 970 ON BOTH CHANNELS `NO LIGHT UP WITH IGNITER B`. MTC CONDUCTED IGNITER TEST AND D
- [SDR ASAA2017041320465](https://openairdocs.org/sdr/ASAA2017041320465), Apr 13, 2017: Boeing 737890. LEAD. FRAYED. WHILE PERFORMING T/C 78474000 MAIN IGNITER PLUGS REMOVAL AND INSTALLATION, FOUND THE LEFT IGNITION LEAD WORN AND FRAYED  (N584AS)
- [SDR 9JLA201705229610](https://openairdocs.org/sdr/9JLA201705229610), Mar 28, 2017: Cessna 560XL. WIRE. DAMAGED. MAINTENANCE CREW HAD A REPORT THAT THE LT ENGINE IGNITION SYSTEM FAILED. VERIFIED THAT THERE WAS NO IGNITION OPERATION W (N629BT)
- [SDR ASAA2017030620035](https://openairdocs.org/sdr/ASAA2017030620035), Mar 6, 2017: Boeing 737990ER. CIRCUIT BREAKER. TRIPPED. ATTEMPTED TO START THE NR 2 ENGINE, START VALVE OPENED BUT NO FUEL FLOW OCCURED AND NO LIGHT OFF. BOTH ENGINE VALVE AND  (N483AS)
- [SDR UIEA2016060100366](https://openairdocs.org/sdr/UIEA2016060100366), May 31, 2016: Boeing 76738E. CONNECTOR. UNSECURE. RIGHT ENG IGNITOR 1 STATUS MSG. PLACED ON MEL 74-00-01B, MDDR 67109. SECURED CONNECTOR SOCKETS AT AW0325 CONNECTION SYS  (N641GT)
- [SDR UIEA2016052500352](https://openairdocs.org/sdr/UIEA2016052500352), May 25, 2016: Boeing 76738E. CONNECTOR. LOOSE. RIGHT ENG IGNITER 1 STATUS MSG. PLACED DEFERRAL 74-00-01B MDDR 66953. FOUND CONNECTOR ON EXCITER BOX LOOSE, TIGHTENED SA (N641GT)
- [SDR HNAA2016040500099](https://openairdocs.org/sdr/HNAA2016040500099), Mar 31, 2016: Dhav DHC8102. CIRCUIT BREAKER. FAILED. NR 1 ENGINE FAILS TO START. FOUND C/B ENGINE NR 1 OPENED. RAN TEMP WIRE FROM 9811-P27T TO 9811-TB19 7F AND VERIFIED C/B  (N808EX)
- [SDR UIEA2016032200215](https://openairdocs.org/sdr/UIEA2016032200215), Mar 20, 2016: Boeing 767277. WIRE. BROKEN. RIGHT ENG NR 1 IGNITION INOPERATIVE. FOUND BROKEN WIRE AT RELAY K607 PIN A1 IN P11 NR 1 IGN SYS. RE-TERMINATED WIRE W040 (N767MW)
- [SDR CA151019009](https://openairdocs.org/sdr/CA151019009), Oct 15, 2015: Cessna 560CESSNA. LEAD. DAMAGED. (CAN) CREW REPORTED INABILITY TO START NR 2 ENGINE. 2 ATTEMPTS WERE MADE IN FULL AUTO. CARRIED OUT ENGINE "DRY-MOTOR", A
- [SDR 7C7A201506110052](https://openairdocs.org/sdr/7C7A201506110052), Jun 10, 2015: Dhav DHC8106. WIRE. DAMAGED. SCC-1430L AVIONICS COOLING FAN INOP. (FIRE/SMOKE INFLIGHT AIR TURNBACK). AVIONICS COOLING FAN DEFERRED AND THEN REPLACED (N891EA)
- [SDR HALA2015022200024](https://openairdocs.org/sdr/HALA2015022200024), Feb 22, 2015: Boeing 7673CB. WIRE. DAMAGED. ETOPS SIGNIFICANT SYSTEM-UPON C/W 12K TASK CARD FOUND NR 2 ENGINE "B" IGNITION WIRE DAMAGE GOING INTO TOP OF THE PLUG. I (N592HA)
- [SDR CA140321011](https://openairdocs.org/sdr/CA140321011), Feb 9, 2014: Cessna 182N. LEAD. MISINSTALLED. (CAN) DURING ENGINE MAGNETO TIMING/SYNCHRONIZATION, FOUND IGNITION SWITCH POSITIONS INCORRECT. TROUBLESHOOTING DETERMINE
- [SDR CA130410003](https://openairdocs.org/sdr/CA130410003), Apr 1, 2013: Cndair CL6002C10. WIRE. DAMAGED. (CAN) LIGHTNING STRIKE ON RT SIDE OF ACFT. RT ENGINE ITT IMMEDIATELY WENT ABOVE RED LINE AND RT ENGINE SHUTDOWN. CREW DI
- [SDR UALA2013040202124](https://openairdocs.org/sdr/UALA2013040202124), Mar 31, 2013: Boeing 767322. CONNECTOR. REVERSED. LEFT ENGINE NR 2 IGNITION SYSTEM INOPERATIVE. FOUND M7196 NR 1 EXCITER BOX CONNECTOR SWAPPED WITH M7197 NR 2 EXCITER BOX (N658UA)
- [SDR 2013FA0000197](https://openairdocs.org/sdr/2013FA0000197), Mar 14, 2013: Cirrus SR20. WIRE. BROKEN. DURING TAXI IN, ENGINE WAS VIBRATING AND MIS-FIRING AT OR BELOW 1000 RPM. MX PERSONNEL DUPLICATED PROBLEM BY PLACING MAG (N36PL)
- [SDR 2013FA0000145](https://openairdocs.org/sdr/2013FA0000145), Mar 4, 2013: Cirrus SR20. IGNITION LEAD. CHAFED. IGNITION HARNESS DISCOVERED CHAFING IN SEVERAL LOCATIONS DUE TO FACTORY ROUTING OF WIRES. THIS CONDITION WAS FOUND ON 5  (N10110)
- [SDR CA121206008](https://openairdocs.org/sdr/CA121206008), Dec 3, 2012: Emb EMB500. LEAD. FAILED. (CAN) MOC RECEIVED A CALL FROM THE FLIGHT CREW. THE CREW REPORTED DURING THE START OF ENGINE NR 1 THERE WAS NO ITT INCRE
- [SDR 2012FA0000770](https://openairdocs.org/sdr/2012FA0000770), Nov 7, 2012: Cirrus SR20. WIRE HARNESS. WORN. MORE THAN 10 AREAS OF THE IGNITION WIRE HARNESS HAD WORN THROUGH THE SHIELDING. TWO WIRES WOULD NOT PASS HIGH TENSION TE (N156KT)
- [SDR UALA2012081704588](https://openairdocs.org/sdr/UALA2012081704588), Aug 17, 2012: Boeing 777222. CONNECTOR. DEFECTIVE. FOUND ELECTRICAL CONNECTOR ON R1 IGNITION EXCITER LOCKING FUNCTION DEFECTIVE WHILE WORKING DF0616. REPLACED CONNECTOR. C (N773UA)
- [SDR CA121212004](https://openairdocs.org/sdr/CA121212004), Jul 24, 2012: Piper PA44180. SWITCH. FAULTY. (CAN) LEFT ENGINE, RT MAGNETO SWITCH FOUND TO BE FAULTY AND REPLACED WITH NEW.

All 97: https://openairdocs.org/jasc/7497/reports.md

## Other codes in chapter 74

- [JASC 7400](https://openairdocs.org/jasc/7400): Ignition System (249 reports)
- [JASC 7410](https://openairdocs.org/jasc/7410): Ignition Power Supply (89 reports)
- [JASC 7411](https://openairdocs.org/jasc/7411): Low Tension Coil (14 reports)
- [JASC 7412](https://openairdocs.org/jasc/7412): Exciter (300 reports)
- [JASC 7413](https://openairdocs.org/jasc/7413): Induction Vibrator (5 reports)
- [JASC 7414](https://openairdocs.org/jasc/7414): Magneto/Distributor (2,447 reports)
- [JASC 7420](https://openairdocs.org/jasc/7420): Ignition Harness (Distribution) (213 reports)
- [JASC 7421](https://openairdocs.org/jasc/7421): Spark Plug/Igniter (703 reports)
- [JASC 7430](https://openairdocs.org/jasc/7430): Ignition Switching (111 reports)

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