# SDR ASAA12511673

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2012
- Submitted: June 11, 2012
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 17,829 hours, 5,679 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Sensor
- Part number: 3205490040
- Part serial: EM168588
- Condition: Intermittent
- Location: Nr 2 Engine
- Part time: 17,839 hours, 5,681 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA12511673

## Discrepancy

NR 2 VIBRATION INDICATION MISSING INTERMITTENTLY AFTER ENGINE START.  GROUNDED, RAN NR 2 ENG NR 2 N2 AND NR 2 VIBE INDICATIONS WENT BLANK.  VIBE MONITOR FAULTED N2 TACH LOSS NR 2 DEFAULTED 31-63160, NR 2 ENG RPM INVALID.  REPLACED N2 SPEED SENSOR NR 2 ENG REF MM 77-11-02.  SENSOR LEAK CKS FAULT CHKS GOOD REF MM 71-00-00. NR 2 ENG VIB INDICATION AND N2 INDICATION CK GOOD.

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