# SDR QR9R2025052000001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2025
- Submitted: May 20, 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: 9447
- Aircraft time: 3,756 hours
- System (JASC): [6340 · Rotor Drive Indicating System](https://openairdocs.org/jasc/6340)
- Part: Indicator
- Part number: B771M40C1005
- Part serial: 737
- Condition: Stuck
- Location: Triple Tach
- Stage of operation: CR
- How discovered: V
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R2025052000001

## Discrepancy

#1 ENGINE N2 STUCK AT 96%. SHUTDOWN ENGINES AFTER LANDING AND THE NEEDLE REMAINED AT 96%. ALL OTHER ENGINE INDICATIONS WERE NORMAL. A TEST FLIGHT EVAL FOUND BOTH NR AND #1 N2 NEEDLES ON TRIPLE TACH WERE INTERMITTENT. REMOVED AND REPLACED TRIPLE INDICATOR IAW AMM 77-14-00, 4-1. MOC OKAY.

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