# SDR SIMA20231209001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2023
- Submitted: December 10, 2023
- Operation: Air carrier
- Aircraft: [N201NN](https://openairdocs.org/aircraft/N201NN), 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: 17000461
- Aircraft time: 22,678 hours, 14,738 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CL
- How discovered: V
- Nature of condition: C, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SIMA20231209001

## Discrepancy

FLT DECLARED MECHANICAL EMERGENCY. FLT RETURNED TO FAR. CLIMBING THROUGH 9000-10000 I NOTICED CABIN ALT 7500 RATE 500 FPM TO 1000 FPM SOMETIMES IN AMBER RANGE. MAX DELTA P WAS 7..8 UPON LANDING. THE CABIN ALT MAINTAINED 7500. RATE WAS ERRATIC. EICAS MESSAGE PRESN AUTO FAULT-C/A-PERFORMED FIM TASK 21-31-00-810-819-A. REMOVED OBSTRUCTION FROM OUTFLOW VALVE. OPS CHECK GOOD. AIRCRAFT OK FOR SERVICE

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