# SDR ASAA2018060844916

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 4, 2018
- Submitted: June 11, 2018
- Operation: Air carrier
- Aircraft: [N594AS](https://openairdocs.org/aircraft/N594AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35191
- Aircraft time: 39,125 hours, 11,796 cycles
- Engine: Cfmint CFM567B273
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Filter
- Condition: Warning Light
- Location: Nr 1 Engine
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018060844916

## Discrepancy

FOUND A NR 1 ENGINE SHORT TIME FAULT, 77-21131.  THE N2 SPEED SENSOR SIGNALS DISAGREE ON FLIGHT LEG 3.  ACFT GROUNDED.   THE NR 1 ENGINE WAS REPLACED DUE TO AN OIL FILTER BYPASS LIGHT ILLUMINATION DUIRNG CLIMBOUT.

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