# SDR QR9R2025030700003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 7, 2025
- Submitted: March 7, 2025
- Operation: General aviation
- Filed by: [M1 Support Services, repair station QR9R369D](https://openairdocs.org/faa-repair-station/QR9R369D/m1-support-services.md) (OpenAirDocs)
- Make and model: Bolkms BK117C2
- Aircraft serial: 9109
- Aircraft time: 5,169 hours
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Control Unit
- Part number: 3130012021200
- Part serial: P200044
- Condition: Failed
- Location: Nr 4
- Stage of operation: TX
- How discovered: V
- Nature of condition: F
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R2025030700003

## Discrepancy

DURING START RUN-UP, COMM 4 ERROR MESSAGE READ NO RT'S AVAILABLE. REMOVED AND REPLACED C-5000 FM CONTROL; MOC SUCCESSFULLY COMPLETED.

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