# SDR SIMA20240928001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 28, 2024
- Submitted: September 30, 2024
- Operation: Air carrier
- Aircraft: [N291NN](https://openairdocs.org/aircraft/N291NN), registered now
- Make and model: Emb ERJ 170-200 LR
- Registry model: [EMB ERJ 170-200 LR](https://openairdocs.org/model/embraer-s-a-erj-170-200-lr) (OpenAirDocs)
- Aircraft serial: 17000842
- Aircraft time: 11,812 hours, 7,919 cycles
- System (JASC): [3810 · Potable Water System](https://openairdocs.org/jasc/3810)
- Part: Drain Valve
- Part number: FRH340021H
- Condition: Failed
- Location: Aft Lav
- Stage of operation: TO
- How discovered: V
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SIMA20240928001

## Discrepancy

MECH- AFT LAV HIGH VIBRATION AND HUMMING ON TAKE OFF. DECLARED EMERGENCY RETURN TO DFW. NOISE FOUND TO BE COMING FROM AUTO DRAIN VALVE. RAR AUTO DRAIN VALVE IAW AMM 38-31-04

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