# JASC 7412: Exciter

- Type: JASC system/component code (FAA)
- ATA chapter: 74 Ignition
- Title in the code table: EXCITER
- Service difficulty reports: 300
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=64
- Page: https://openairdocs.org/jasc/7412

## What it covers

The unit used with turbine engine ignition systems for starting engines. Typical parts are exciter box, bracket, relay. The component make and model should be included.

## Service difficulty reports (300, newest 50)

- [SDR YENA2026101200939](https://openairdocs.org/sdr/YENA2026101200939), Oct 10, 2026: Airbus A321271NX. EXCITER. FAULTED. FLT # 1577, BOS-LAS. (ETOPS) "ENG 2 IGNITION A FAULT ( IGNITION SYSTEMS SYSTEM A ) ; REMOVED AND REPLACED ENG #2 IGN EXC (N2157J)
- [SDR SWAA2026080350456](https://openairdocs.org/sdr/SWAA2026080350456), Jul 28, 2026: Boeing 7378H4. EXCITER. FAILED. ENGINE NR 2 FUEL FLOW DROPPED TO ZERO, NO LIGHT OFF. OK TO CONTINUE PER MEL 74-1-02 SP1 T/S FAULT PER M-24-174-00061 ON  (N8531Q)
- [SDR ABXA20260722331](https://openairdocs.org/sdr/ABXA20260722331), Jul 22, 2026: Boeing 767381. EXCITER. DEFECTIVE. ON PUSH BACK & START LEFT ENG IGNITOR 1 & 2 FAILED. CREW RETURNED TO THE GATE (BTB). T/S LEFT ENG IGNITION SYS IAW FIM 7 (N391CM)
- [SDR YENA2026042800437](https://openairdocs.org/sdr/YENA2026042800437), Apr 28, 2026: Airbus A321271NX. EXCITER. FAULTED. FLT# 1620. BOS-LHR. (ETOPS) "ENG 2 IGN B FAULT ( IGNITION SYSTEMS B) SYSTEM B ); REPLACED ENG 2 IGN EXICTER PER AMM 74-1 (N2193J)
- [SDR I5PA2026042519302](https://openairdocs.org/sdr/I5PA2026042519302), Apr 25, 2026: Boeing 757223. EXCITER. FAILED. FLIGHT MGE305, LEFT ENGINE IGNITION SYSTEM 1 INOP. REPLACED SYS 1 EXCITER. (N193AN)
- [SDR NACA2025093000007](https://openairdocs.org/sdr/NACA2025093000007), Sep 30, 2025: Boeing 76733A. EXCITER. DAMAGED. NR 1 ENG TOP IGNITION EXCITER INSIDE OUTPUT RECEPTACLE WELL HAS DAMAGE / SIGNS OF ARCING ON THE CONTACT BUTTON. REMOVED  (N567NC)
- [SDR I5PA2025093019306](https://openairdocs.org/sdr/I5PA2025093019306), Sep 28, 2025: Boeing 757223. EXCITER. INOPERATIVE. LEFT ENGINE IGNITION SYSTEM 1 INOPERATIVE. REPLACED LEFT ENGINE IGNITION SYSTEM 1 EXCITER. (N193AN)
- [SDR I5PA2025091768802](https://openairdocs.org/sdr/I5PA2025091768802), Sep 17, 2025: Boeing 757230. EXCITER. INOPERATIVE. RIGHT ENGINE IGNITION SYSTEM 1 INOP. PERFORMED OPS CHECK, FOUND SYSTEM 1 EXCITER INOP. REPLACED IGNITION EXCITER PER APP (N688SL)
- [SDR QR9R2025091100001](https://openairdocs.org/sdr/QR9R2025091100001), Sep 11, 2025: Bolkms BK117C2. EXCITER. FAILED. ABORTED TAKEOFF FOR #2 ENGINE WOULD NOT START DURING RUNUP. TROUBLESHOOTING REVEALED THE FWD IGNITION EXCITER BOX ON #2 
- [SDR YENA2025090500913](https://openairdocs.org/sdr/YENA2025090500913), Sep 4, 2025: Airbus A321271NX. EXCITER. FAULTED. FLT#1621, LHR-BOS. (ETOPS) L1 TSI - ENG 1 IGN A FAULT, APPROVAL REQUIRED FOR RESOLUTION, DUE TO PREVIOUS ENGINE 1 IGNITI (N4022J)
- [SDR CALA2025081107527](https://openairdocs.org/sdr/CALA2025081107527), Aug 11, 2025: Airbus A319131. EXCITER. FAULTED. HUNG START ON NUMBER 1 ENGINE AFTER STARTER CUT OUT. STRONG FUEL ODOR IN FLTDECK AFTER CRANK CLASS 3 FUEL DEPULSE ACTIVA (N838UA)
- [SDR HALA20250708209](https://openairdocs.org/sdr/HALA20250708209), Jul 7, 2025: Airbus A330243. EXCITER. OUT OF LIMITS. ETOPS - #2 ENG IDG EXCITER FIELD CHECKS OUT OF LIMITS PER TSM 24-20-00-810-875-A PARA 4 (A) (1). IDG REMOVED UP TO AMM 2 (N393HA)
- [SDR HALA20250627199](https://openairdocs.org/sdr/HALA20250627199), Jun 26, 2025: Airbus A321271N. EXCITER. FAULTED. ETOPS - ENG 1 IGN B FAULT. REMOVED & REPLACED IGNITION EXCITER PER AMM 74-11-01-000-801-A & AMM 74-11-01-400-801-A. REMO (N214HA)
- [SDR YENA2025060400563](https://openairdocs.org/sdr/YENA2025060400563), Jun 3, 2025: Airbus A321271NX. EXCITER. FAILED. FLT#1907, JFK-CDG. (ETOPS) 'ENG 1 ING B FAULT ( IGNITION SYSTEMS B) SYSTEM B ); REMOVED AND REPLACED IGN B IAW AMM 74-21 (N4077J)
- [SDR I5PA2025042875701](https://openairdocs.org/sdr/I5PA2025042875701), Apr 28, 2025: Boeing 75729J. EXCITER. FAULTED. FLT: MGE301. LH ENG DID NOT START ON IGNITOR 1 STARTED NORMAL ON BOTH. R/R LH ENG EXCITER 1 PER AMM. (N757QM)
- [SDR DXTA2025012702092](https://openairdocs.org/sdr/DXTA2025012702092), Jan 23, 2025: Emb EMB505. EXCITER. DEFECTIVE. LEFT ENGINE HUNG START: 80-10-06-01 WHEN STARTING ENGINE 1 OBSERVED IGNITION B FUEL FLOW, AND N1 HANG AT 4% ABORTED THE  (N330QS)
- [SDR HNAA2024120901165](https://openairdocs.org/sdr/HNAA2024120901165), Dec 6, 2024: Emb EMB145LR. EXCITER. FAULTED. E2 HUNG START AT 30%N2 ON FADEC A. CREW STOPPED START SEQ WHEN FUEL SMELLED IN A/C. FACT 06DEC24 21:38 PHL R&R E2 LEFT I (N670AE)
- [SDR CALA2024100900792](https://openairdocs.org/sdr/CALA2024100900792), Oct 7, 2024: Boeing 737824. EXCITER. FAULTY. ATTEMPTED 3 ENGINE STARTS FIRST 2 L IGNITION 3RD ATTEMPT W/ IGNITION IN BOTH ENGINE #1 FAILED TO START, ADDED ENG #1 EEC (N14231)
- [SDR CALA2024051401472](https://openairdocs.org/sdr/CALA2024051401472), May 11, 2024: Boeing 777222. EXCITER. FAULTED. ENG IGNITOR R2 STATUS MSG AFTER LANDING EXISITING FAULT MESSAGE 74-61502. REQUEST TO APPLY 7400D. ITEM PLACED ON MEL 740 (N227UA)
- [SDR ASAA2023102145769](https://openairdocs.org/sdr/ASAA2023102145769), Oct 21, 2023: Boeing 7379. EXCITER. FAULTY. #1 ENG. WILL NOT START WITH IGN. R/H STARTS NORMAL WITH IGN. L/H. GROUNDED - YES. (RESOLVED ON W/O: 1974578 TASKCARD: N/ (N956AK)
- [SDR ASAA2023092645343](https://openairdocs.org/sdr/ASAA2023092645343), Sep 26, 2023: Boeing 7379. EXCITER. INOPERATIVE. L IGN INOP #1 ENG. GROUNDED - YES. (RESOLVED ON W/O: 1971196 TASKCARD: N/R-00001 ) FOUND MAINTENANCE MESSAGE 74-42491. A (N949AK)
- [SDR ABXA20240925188](https://openairdocs.org/sdr/ABXA20240925188), Sep 22, 2023: Boeing 767200. EXCITER. DEGRADED. #2 ENGINE WOULD NOT START ON APU.,ACCOMPLISHED APU OPS AND LEAK CHECK IAW B767 AMM 49-11-00. APU PNEUMATICS WORK GOOD IN (N650GT)
- [SDR CALA2023082802643](https://openairdocs.org/sdr/CALA2023082802643), Aug 25, 2023: Boeing 767322. EXCITER. INOPERATIVE. ENG. 2 DID NOT LIGHT OFF WITH IGNITER 1.. OK IN BOTH IGNITERS. THIS ITEM IS RELATED TO LP 5547676 TO BE CLEARED AN REFER (N654UA)
- [SDR ASAA2023082344743](https://openairdocs.org/sdr/ASAA2023082344743), Aug 23, 2023: Boeing 7379. EXCITER. FAULTY. DID NOT GET LIGHT OFF ON #2 ENG START. GOOD DUCT PRESSURE. HAD FUEL FLOW FOR 5-10 SEC - THEN WENT TO ZERO. IGNITION CB'S (N960AK)
- [SDR ASAA2023073144331](https://openairdocs.org/sdr/ASAA2023073144331), Jul 31, 2023: Boeing 7379. EXCITER. FAULTY. #2 ENGINE NO LIGHT OFF, NO FUEL FLOW OBSERVED. GROUNDED - YES. (RESOLVED ON W/O: 1960968 TASKCARD: N/R-00001 ) REMOVED A (N975AK)
- [SDR ASAA2023062143661](https://openairdocs.org/sdr/ASAA2023062143661), Jun 21, 2023: Boeing 737990ER. EXCITER. FAULTY. STARTING #1 ENGINE WITH HUFFER CART AND IGN SWITCH ON R WE GOT 2 HUNG STARTS WITH APPARENT LITE OFF. CONTACTED MAINTENAN (N467AS)
- [SDR ASAA2023052543391](https://openairdocs.org/sdr/ASAA2023052543391), May 25, 2023: Boeing 7379. EXCITER. FAULTY. #2 ENGINE FAILED TO START. HUNG START AFTER MOTORING FUEL FLOW WAS INTRODUCED AT 0.24 FOR 5-10 SECONDS THEN WENT TO ZERO (N979AK)
- [SDR ASAA2023010941494](https://openairdocs.org/sdr/ASAA2023010941494), Jan 9, 2023: Boeing 737890. EXCITER. FAULTED. ON ENGINE #2 START WITH START LEVER IDLE NO EGT RISE OR LIGHT OFF. ON IGNITION R. GROUNDED - YES. REMOVED AND REPLACED # (N530AS)
- [SDR DALA2023010300030](https://openairdocs.org/sdr/DALA2023010300030), Jan 3, 2023: Boeing 757232. EXCITER. FAILED. FIRE/DE - ABORTED ENGINE START ON RIGHT ENGINE. MOTORED ENGINE PER QRH. SWITCHED FROM ENG START 1 TO ENGINE START 2. SEC (N681DA)
- [SDR YENA2022120901238](https://openairdocs.org/sdr/YENA2022120901238), Dec 9, 2022: Airbus A321271N. EXCITER. FAILED. FLT#1926, LGW-BOS. (ETOPS) 'ENG IGN A FAULT DURING START; REMOVED AND REPLACED # 1 ENG IGNITION EXCITER BOX IAW EMM 74-1 (N2105J)
- [SDR ASAA2022112740983](https://openairdocs.org/sdr/ASAA2022112740983), Nov 27, 2022: Boeing 737990ER. EXCITER. FAULTED. #2 ENGINE FAILED TO START WITH THE RIGHT IGNITOR 2 FAILED ATTEMPTS. GROUNDED - YES. REMOVED AND REPLACED THE R/H IGNITER (N402AS)
- [SDR ASAA2022111940907](https://openairdocs.org/sdr/ASAA2022111940907), Nov 19, 2022: Boeing 7379. EXCITER. INOPERATIVE. NO 1 ENGINE NO EGT ON START WITH R IGNITOR SELECTED. WITH LEFT IGNITOR SELECTED THE START WAS SUCCESSFUL. GROUNDED - YES (N949AK)
- [SDR P5CA2022111700204](https://openairdocs.org/sdr/P5CA2022111700204), Nov 17, 2022: Boeing 7673JHF. EXCITER. FAULTED. SINGLE IGNITOR FAIL, NO LIGHT. R/ #2 ENGINE(<P>CONTINUE OPS PER MEL 74-00-01A TRANSFER TO MDDR 175362. CAT A DUE 18NOV22 (N643GT)
- [SDR ASAA2022111440827](https://openairdocs.org/sdr/ASAA2022111440827), Nov 14, 2022: Boeing 7379. EXCITER. FAULTED. ON INITIAL START ATTTEMP FOR ENGINE #1, START LEVER WAS RAISED TO IDLE AFTER "MOTORING" EXTINGUISHED, 'SPAR VALVE CLOSED (N949AK)
- [SDR ASAA2022111140775](https://openairdocs.org/sdr/ASAA2022111140775), Nov 11, 2022: Boeing 7379. EXCITER. INOPERATIVE. AMBER MAINT LIGHT ON OVERHEAD PANEL ILLUMINATED ON LANDING. GROUNDED - YES. MAINT LIGHT ILLUMINATED DUE TO ENG 2 IGNITIO (N919AK)
- [SDR ASAA2022111040759](https://openairdocs.org/sdr/ASAA2022111040759), Nov 10, 2022: Boeing 7379. EXCITER. INOPERATIVE. #2 ENGINE FAILED TO START AFTER PUSHBACK. START LEVER WAS IN IDLE FOR 15 SECONDS WITH NO EGT RISE. GROUNDED - YES. REMOV (N919AK)
- [SDR ASAA2022102740534](https://openairdocs.org/sdr/ASAA2022102740534), Oct 27, 2022: Boeing 7379. EXCITER. FAULTY. STARTING #2 ENG, MOTORED FOR A FEW SECONDS, N2 BEGAN TO RISE AT 36 SECONDS, FUEL WAS INTRODUCED AND N2 HUNG AROUND 32.0  (N919AK)
- [SDR ABXA2022081378](https://openairdocs.org/sdr/ABXA2022081378), Aug 13, 2022: Boeing 767231. EXCITER. DEFECTIVE. LEFT NO LIGHT OFF WITH #2 IGNITION ACCOMPLISHED ABORTED ENG PROC. ATTEMPTED SECOND START IN BOTH, NO LIGHT OFF. FF=700 N (N650GT)
- [SDR ASAA2021081235709](https://openairdocs.org/sdr/ASAA2021081235709), Aug 12, 2021: Boeing 737890. EXHAUST CONE. FAILED. DURING #2 ENGINE START WITH START LEVER AT IDLE AS N2 NEARED 30% FUEL DROPPED TO ZERO. UNSUCCESSFUL START. GROUNDED - YE (N558AS)
- [SDR UIEA2021052401167](https://openairdocs.org/sdr/UIEA2021052401167), May 23, 2021: Boeing 76731B. EXCITER. FAULTED. R ENG IGNITER 2 STATUS MESSAGE.(<P>REMOVED AND REPLACED LEFT AND RIGHT IGNITER ON ENGINE # 2 (P/N 10-630390-5) IAW B767  (N1361A)
- [SDR ASAA2021050534760](https://openairdocs.org/sdr/ASAA2021050534760), May 5, 2021: Boeing 737890. EXCITER. FAILED. #2 ENG FAILED TO LIGHT OFF DURING STARTING START SWITCH WAS IN "L". GROUNDED - YES. CONFIRMED FAULT, #2 ENGINE L-IGNITIO (N579AS)
- [SDR ASAA2021042834707](https://openairdocs.org/sdr/ASAA2021042834707), Apr 28, 2021: Boeing 737890. EXCITER. FAILED. #2 ENG FAILED TO START 2 ATTEMPTS WITH "L" IGNITION. GROUNDED - YES. REMOVED AND REPLACED L AND R MAIN IGNITERS REF T/C  (N592AS)
- [SDR ASAA2021032934450](https://openairdocs.org/sdr/ASAA2021032934450), Mar 29, 2021: Boeing 737990ER. EXCITER. INOPERATIVE. DURING #2 ENGINE START, FUEL FLOW WAS LESS THAN NORMAL. START STAGNATED, AND FUEL FLOW WENT TO ZERO. GROUNDED - YES. REM (N459AS)
- [SDR ASAA2021032234393](https://openairdocs.org/sdr/ASAA2021032234393), Mar 22, 2021: Boeing 737990ER. EXCITER. INOPERATIVE. ENGINE # 2 DID NOT START ON RIGHT IGNITER STARTED PROPERLY ON LEFT IGNITER. GROUNDED - YES. REMOVED AND REPLACED #2 ENG  (N459AS)
- [SDR I5PA2021022188806](https://openairdocs.org/sdr/I5PA2021022188806), Feb 21, 2021: Boeing 757230. EXCITER. INOPERATIVE. LEFT ENGINE IGNITION SYSTEM NUMBER 2 FOUND INOPERATIVE DUE TO A FAULTY IGNITION EXCITER. EXCITER WAS REPLACED AND CONFIR (N888LT)
- [SDR I5PA2021012188804](https://openairdocs.org/sdr/I5PA2021012188804), Jan 21, 2021: Boeing 757230. EXCITER. FAULTY. DISCREPANCY NR 1 ENGINE FAILED TO START WITH IGN 1. STARTED OK WITH IGN SW BOTH POSITION. CORRECTIVE ACTION: REMOVED AND (N888LT)
- [SDR 9JLA2021020425345](https://openairdocs.org/sdr/9JLA2021020425345), Jan 3, 2021: Lear 60LEAR. EXCITER. DEFECTIVE. THE FLIGHT CREW REPORTED THAT DURING ENGINE START AN AMBER RIGHT ENGINE COMPUTER ANNUNCIATOR ILLUMINATED. THE MAINTENANC (N821DF)
- [SDR HALA2020112000210](https://openairdocs.org/sdr/HALA2020112000210), Nov 18, 2020: Airbus A321271N. EXCITER. DEFECTIVE. ETOPS DMI NR 202688 BTB. ENGINE 2 IGNITION A FAULT (IGNITION SYSTEMS PW ENGINES SYSTEM A (EXCEPT FOR ER OPERATIONS, MAY  (N212HA)
- [SDR UIEA2020101302232](https://openairdocs.org/sdr/UIEA2020101302232), Oct 13, 2020: Boeing 7673Y0. EXCITER. INOPERATIVE. LEFT ENGINE DID NOT START WITH NR 2 IGNITOR SELECTED. SWITCHED TO BOTH IGNITORS AND START WAS SUCCESSFUL. TRANSFERRED TO (N1619A)
- [SDR ASAA2020090233133](https://openairdocs.org/sdr/ASAA2020090233133), Sep 2, 2020: Boeing 737990ER. EXCITER. INOPERATIVE. DURING START OF NR 1 ENGINE WE OBSERVED NO LIGHT OFF OR EGT INCREASE. RAN QRH PROCEDURES FOR ABORTED START AND DURING SE (N435AS)

All 300: https://openairdocs.org/jasc/7412/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 7413](https://openairdocs.org/jasc/7413): Induction Vibrator (5 reports)
- [JASC 7414](https://openairdocs.org/jasc/7414): Magneto/Distributor (2,446 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)
- [JASC 7497](https://openairdocs.org/jasc/7497): Ignition System Wiring (97 reports)

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