# SDR QR9R2026072300002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 23, 2026
- Submitted: July 23, 2026
- 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: 9831
- Aircraft time: 4,014 hours
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Sensor
- Part number: FSC211
- Part serial: 2021
- Condition: Fluctuates
- Location: Generator
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R2026072300002

## Discrepancy

AFTER REFUEL, DURING PRE-TAKEOFF CHECK, GENERATOR AMPS WERE NOT WITHIN 10 & STAYED AT 15-20+ WITH THE NR 2 BETWEEN 35-40 AND NR 1 SOLID AT 20. A TEST FLIGHT EVAL SHOWED AFTER START AND IN FLIGHT IDLE, BOTH SIDES INDICATED 28.4V. AMPS WERE 25-30 ON NR 1 AND 40 ON NR 2. AS SOON AS THE SEARCH LIGHT WAS TURNED ON, NR 1 AMP SHOWED 30 AND NR 2 SHOWED 50. BOTH VOLTAGES WERE STEADY 28.4. REMOVED AND REPLACED HALL SENSOR; 10 MINUTE GROUND RUN COMPLETED IAW RFM. BOTH SIDES AMPS WERE STEADY AT 45 AMPS.

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