# SDR 2026FA0000302

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 10, 2026
- Submitted: April 28, 2026
- Operation: General aviation
- Aircraft: [N9140X](https://openairdocs.org/aircraft/N9140X), registered now
- Make and model: Mooney M20J
- Registry model: [Mooney M20J](https://openairdocs.org/model/mooney-m20j) (OpenAirDocs)
- Aircraft serial: 243245
- Aircraft time: 2,942 hours
- Engine: Lyc IO360A3B6
- Engine time: 2,942 hours
- System (JASC): [7411 · Low Tension Coil](https://openairdocs.org/jasc/7411)
- Part: Coil
- Part number: EA2000
- Part serial: 23439006
- Condition: Arced
- Part time: 11 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000302

## Discrepancy

ENGINE CYLINDER NR 4 WAS EXPERIENCING INTERMITTENT MISFIRING. FOUND L/H COIL WAS GROUNDING TO ITS MOUNT THROUGH A SMALL PINHOLE IN BOTTOM OF THE COIL CASE.THE COIL WAS RETURNED TO ELECTROAIR FOR EVALUATION. ELECTROAIR STATED THAT IT WAS TESTED AND "THERE WAS NOTHING WRONG WITH IT". THE COIL WAS RETURNED AND A NEW COIL WAS INSTALLED, WHICH SOLVED THE MISFIRE CONDITION. WE CONNECTED A HIGH TENSION CABLE TESTER TO THE SUSPECT COIL AND OBSERVED HIGH VOLTAGE ARCING EMANATING FROM THE PINHOLE AS DESCRIBED ABOVE.  MY CONCERN IS THIS COIL WAS DETERMINED TO BE AIRWORTHY AND THE OWNER COULD HAVE SOLD IT IN THE USED MARKET.

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