# SDR QR9R20211029008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2021
- Submitted: October 29, 2021
- 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: 14723449719
- Aircraft time: 2,425 hours
- System (JASC): [6340 · Rotor Drive Indicating System](https://openairdocs.org/jasc/6340)
- Part: None
- Part number: SSTUVEURC21S
- Part serial: 0581
- Condition: Fault Message
- Stage of operation: HO
- How discovered: V
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R20211029008

## Discrepancy

FLT #1, WHILE CONDUCTING NORMAL HOVER FLIGHT ON HOVER TAXI LANE, MAST MOMENT EXCEEDANCE MESSAGE RECEIVED. MM INDICATED VISUALLY ON CAD SCREEN 71% AT THE 7 O'CLOCK POSITION. WITH MM EXCEED CAD CAUTION MESSAGE, THEN RETURNED TO NORMAL FOR ABOUT 2 SECONDS THEN MM EXCEED INDICATED AGAIN 71% AT THE 7 O'CLOCK POSITION. LANDED A/C IMMEDIATELY. INDICATION ON SHUTDOWN REPORT SAID >64% FOR 2.2 SECONDS, > 77% FOR 1.4 SECONDS AND >90% FOR .8 SEC. REPLACED SSTU IAW 63-42-00, 4-2. 30 MINUTE TEST FLIGHT COMPLETED IAW UH72 RFM.

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