# SDR USAASB98179

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N232US
- Make and model: Boeing 737201
- Aircraft serial: 22018
- System (JASC): [7930 · Engine Oil Indicating System](https://openairdocs.org/jasc/7930)
- Part: Switch
- Part number: 1163P181
- Condition: Failed
- Location: Nr 1
- Part time: 2,057 hours
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAASB98179

## Discrepancy

BOS - FLT 921 - ON CLIMB-OUT FROM BOS, THE NR 1 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED.  ENGINE WAS BROUGHT BACK TO IDLE AND AN EMERGENCY WAS DECLARED.  FLIGHT RETURNED TO FIELD AT BOS AND LANDED WITHOUT INCIDENT.  THE NR 1 ENGINE WAS SHUT DOWN AFTER LANDING.  MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE OIL FILTER (P/N 056306-06).  NO CONTAMINATION WAS FOUND.  REMOVED AND REPLACED THE NR 1 ENGINE OIL FILTER BYPASS SWITCH.  RAN ENGINE.  OPS CHECK AND LEAK CHECK GOOD.  (X)

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