# SDR QR9R2025030700002

- 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: 9328
- Aircraft time: 4,472 hours
- System (JASC): [6340 · Rotor Drive Indicating System](https://openairdocs.org/jasc/6340)
- Part: Transmitter
- Part number: SSTUVEURC21S
- Condition: Failed
- Location: Main Rotor
- 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/QR9R2025030700002

## Discrepancy

MAST MOMENT READING ON VEMD LANE 1 INOP DURING START RUN-UP. TROUBLESHOOTING FOUND THE SSTU FAILED DYN.KAL ON FUNCTIONAL TEST. REMOVED AND REPLACED SENSOR SIGNAL TRANSMITTING UNIT IAW AMM 63-42-00, 4-2.

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