# SDR QMLA2023092520076

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 25, 2023
- Submitted: September 25, 2023
- Operation: Air carrier
- Aircraft: [N138LN](https://openairdocs.org/aircraft/N138LN), registered now
- Make and model: Urocop EC 135 P2
- Registry model: [Urocop EC 135 P2](https://openairdocs.org/model/eurocopter-deutschland-ec-135-p2) (OpenAirDocs)
- Aircraft serial: 0352
- Aircraft time: 7,450 hours, 24,100 cycles
- System (JASC): [3100 · Indicating/Recording System](https://openairdocs.org/jasc/3100)
- Part: Tachometer
- Part number: L771M40C1030
- Part serial: 1005
- Condition: Faulted
- Location: Instrument Panel
- Stage of operation: AA
- How discovered: V
- Nature of condition: O, F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QMLA2023092520076

## Discrepancy

TRIPLE TACH FAILURE IN FLIGHT. ROTOR NEEDLE SWUNG FULL DEFLECTION AND BACK TO ZERO MULTIPLE TIMES. NO CHANGE IN ROTOR STABILIZATION. NO ASSOCIATED WARNINGS OR AUDIBLE TONES.

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