# SDR 2017FA0000407

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 16, 2016
- Submitted: August 10, 2017
- Operation: General aviation
- Aircraft: N379DB
- Make and model: Cessna 525B
- Registry model: [Cessna 525B](https://openairdocs.org/model/cessna-525b) (OpenAirDocs)
- Aircraft serial: 525B0191
- System (JASC): [3445 · Air Collision Avoidance System](https://openairdocs.org/jasc/3445)
- Part: Processor
- Part number: 8221294002
- Part serial: 158954
- Condition: Malfunctioned
- Location: Tcas
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2017FA0000407

## Discrepancy

HAD 3 TCAS PROCESSORS FAIL WITHIN A YEAR AND 4 MONTHS.  THEY KEEP SHOWING TCAS FAIL ON THE PILOTS PFD.  MANUFACTURER COULD NOT GET THE UNIT TO FAIL.

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