# SDR 2026FA0000201

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2026
- Submitted: March 20, 2026
- Operation: General aviation
- Aircraft: [N314AV](https://openairdocs.org/aircraft/N314AV), registered now
- Make and model: Cessna 172M
- Registry model: [Cessna 172M](https://openairdocs.org/model/cessna-172m) (OpenAirDocs)
- Aircraft serial: 17263557
- Engine: Lyc O360A4M
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Impulse Coupling
- Part number: 3163
- Condition: Defective
- Location: Magneto
- Component: Magneto, Champion
- Component part number: 4371
- 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/2026FA0000201

## Discrepancy

MAGNETO PULLED DURING ROUTINE MAINTENANCE TO CHECK FOR THE PRESENCE OF A CHAMPION MANUFACTURED IMPULSE COUPLING. ONE WAS FOUND INSTALLED AND THUS REMOVED FOR REPLACEMENT WITH A NEW ES3163 IMPULSE COUPLING.  AFTER REMOVAL OF THE OLD IMPULSE COUPLING, I DISASSEMBLED IT FOR AN INSPECTION AND FOUND THAT BOTH RIVETS HOLDING THE PAWLS IN PLACE WERE LOOSE AND FAILING.

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