# SDR 2026FA0000820

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 24, 2026
- Submitted: October 6, 2026
- Operation: General aviation
- Make and model: Cirrus SR22
- Registry model: [Cirrus SR22](https://openairdocs.org/model/cirrus-design-sr22) (OpenAirDocs)
- Engine: Cont IO550N
- Engine time: 366 hours
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Drive Gear
- Part number: 657984
- Condition: Spalled
- Location: Engine
- Part time: 366 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/2026FA0000820

## Discrepancy

FACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 ALTERNATOR. THE DAMAGE HAS INCLUDED VARYING DEGREES OF SPALLING, GALLING, AND CHIPPING OF THE GEAR TEETH.

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