# JASC 7411: Low Tension Coil - Type: JASC system/component code (FAA) - ATA chapter: 74 Ignition - Title in the code table: LOW TENSION COIL - Service difficulty reports: 14 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=64 - Page: https://openairdocs.org/jasc/7411 ## What it covers For reports of magneto coils used on select engines such as the Pratt & Whitney (PWA), Model R2800, to generate a low tension voltage to high tension voltage coil mounted at each engine cylinder. Not generally used on modern light aircraft reciprocating engines. ## Service difficulty reports (14) - [SDR 2026FA0000810](https://openairdocs.org/sdr/2026FA0000810), Apr 15, 2026: Mooney M20J. COIL. DAMAGED. ENGINE CYLINDER NR 4 WAS EXPERIENCING INTERMITTENT MISFIRING. FOUND LT COIL WAS GROUNDING TO ITS MOUNT THROUGH A SMALL P (N9140X) - [SDR 2026FA0000302](https://openairdocs.org/sdr/2026FA0000302), Mar 10, 2026: Mooney M20J. COIL. ARCED. ENGINE CYLINDER NR 4 WAS EXPERIENCING INTERMITTENT MISFIRING. FOUND L/H COIL WAS GROUNDING TO ITS MOUNT THROUGH A SMALL (N9140X) - [SDR HALA2022090600257](https://openairdocs.org/sdr/HALA2022090600257), Sep 4, 2022: Airbus A330243. NONE. NONE. ETOPS - A/C FAULTING IGN EXC B. DUE TO HISTORY WITH C/B 2EH2 TRIPPING IN FLIGHT RPLACE ENG2 IGN UNIT 1 4000EH1 PER TSM 7 (N388HA) - [SDR UIEA2021091402021](https://openairdocs.org/sdr/UIEA2021091402021), Sep 14, 2021: Boeing 767328. IGNITER. INOPERATIVE. RIGHT ENGINE IGNITION 2 INOP(

REMOVED EXISTING FOR RH ENGINE AND INSTALLED NEW EXCITER IAW B767 AMM 74-11-01, NO HELP. (N1499A) - [SDR HALA2021081000101](https://openairdocs.org/sdr/HALA2021081000101), Aug 12, 2021: Airbus A330243. EXCITER. FAULTED. ETOPS - GN A FAULT, REMOVED AND REPLACED ENG 1 A EXCITER A330 AMM 74-11-54. OPS CK GOOD. (N384HA) - [SDR UIEA2020090841951](https://openairdocs.org/sdr/UIEA2020090841951), Sep 3, 2020: Boeing 767277. IGNITER BOX. MALFUNCTIONED. RT ENGINE NR 1 IGNITION INOPERABLE (IGNITION SYSTEM, EXCEPT ER OPERATIONS (NOTIFY DISPATCH ) R-60. TRANSFERRED TO MDDR 1 (N767MW) - [SDR UIEA2019060744389](https://openairdocs.org/sdr/UIEA2019060744389), Jun 4, 2019: Boeing 76731B. RELAY. FAILED. RIGHT ENGINE IGNITER 1 & 2 STATUS MESSAGES ILLUMINATED.(

REMOVED AND REPLACED #2 IGNITION EXCITER BOX. INSTALLATIO (N1361A) - [SDR UIEA2017052200827](https://openairdocs.org/sdr/UIEA2017052200827), May 22, 2017: Boeing 76736N. WARNING MESSAGE. FALSE ACTIVATION. STATUS MESSAGE LT ENGINE IGNITER. PERFORMED AUDIBLE CHECK, NO DEFECTS NOTED IAW AMM 74-00-00. (N1093A) - [SDR P5CA2017021100060](https://openairdocs.org/sdr/P5CA2017021100060), Feb 11, 2017: Boeing 7673JHF. EXCITER. FAILED. DURING LT ENGINE START, NO LIGHT OFF WITH IGNITOR SELECTED SINGLE. LT ENGINE STARTED NORMAL WHEN SELECTED TO BOTH. REMOV (N644GT) - [SDR 2001F00303](https://openairdocs.org/sdr/2001F00303), Aug 6, 2001: Doug C54BDC. COIL. FAULTY. LEFT MAG NR 4 ROUGH ON PARKING CHECK. COIL WAS BAD AND IT WAS REPLACED. (M) (N44911) - [SDR 2001F00323](https://openairdocs.org/sdr/2001F00323), Jul 16, 2001: Doug C54BDC. COIL. DAMAGED. MATTER FROM INSIDE THE COIL WAS LEAKING OUT CAUSING ELECTRICITY TO RUN ELSEWHERE, NOT THROUGH COIL. (M) (N44911) - [SDR NACA20010019](https://openairdocs.org/sdr/NACA20010019), May 2, 2001: Doug DC6A. COIL. SHORTED. NR 1 ENGINE SHUTDOWN AT 2224Z DUE TO 1 BACKFIRE AND LOW COMPRESSION PATTERN ON CYLINDER NR 5. REPLACED NR 5 CYLINDER COI (N43872) - [SDR NACA2001017](https://openairdocs.org/sdr/NACA2001017), Apr 24, 2001: Doug DC6A. COIL. SHORTED. FEATHERED NR 2 ENGINE AT 1935 DUE TO BACKFIRING AND RUNNING ROUGH. REPLACED THE NR 16 CYLINDER IGNITION COIL. (N43872) - [SDR 20010425CW017](https://openairdocs.org/sdr/20010425CW017), Apr 2, 2001: Piper PA31350. COIL. CRACKED. DURING ROUTINE MAINTENANCE ON DUAL MAGNETO, A CRACK WAS FOUND ON THE RIGHT IGNITION COIL OUTER INSULATION COVERING. THE (N27329) ## 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 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) - [JASC 7497](https://openairdocs.org/jasc/7497): Ignition System Wiring (97 reports) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.