# SDR SWAA2025092417721

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 23, 2025
- Submitted: September 24, 2025
- Operation: Air carrier
- Aircraft: [N7821L](https://openairdocs.org/aircraft/N7821L), registered now
- Make and model: Boeing 737-7CT
- Registry model: [Boeing 737-7CT](https://openairdocs.org/model/boeing-737-7ct) (OpenAirDocs)
- Aircraft serial: 32748
- Aircraft time: 70,238 hours, 36,681 cycles
- Engine: Cfmint CFM567B242
- System (JASC): [7900 · Engine Oil System (Airframe Furnished)](https://openairdocs.org/jasc/7900)
- Part: Bypass Switch
- Condition: Faulted
- Location: Nr 2 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2025092417721

## Discrepancy

NR 2 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED IN FLIGHT.  DID NOT EXTINGUISH WITH THRUST LEVER RETARDED TO CLOSED.   INSPECTED NR 2 ENG OIL FILTER & FOUND NO PRESCENCE OF CONTAMINANTS; R & R OIL FILTER IAW AMM 79-21-06. LEAK CHECKED GOOD. OK TO CONTINUE PER MEL 79-2-01 SP 1 AUTH 281946.   R & R NR 2 ENG OIL FILTER BYPASS SWITCH IAW AMM 79-21-07.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.