# SDR CALA2026071617838

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 14, 2026
- Submitted: July 17, 2026
- Operation: Air carrier
- Aircraft: [N76522](https://openairdocs.org/aircraft/N76522), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31660
- Aircraft time: 48,940 hours, 17,928 cycles
- Engine: Cfmint CFM567B263
- System (JASC): [7921 · Engine Oil Cooler](https://openairdocs.org/jasc/7921)
- Part: Transmitter
- Part number: QA07656
- Condition: Faulted
- Location: Nr 1 Engine
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026071617838

## Discrepancy

OIL FILTER BYPASS MESSAGE SHOWS ON ENGINE DISPLAY ENG 1 AFTER STARTUP. MESSAGE DISSAPEARED. MESSAGE REAPPEARED AFTER TAKE OFF. DIVERTED TO CVG.   C/W EEC BITE FIM 73-00 TASK 801 & FOUND NO RECENT FAULTS.  REMOVED & INSPECTED SCAVENGE FILTER PER MEL 7902A  & AMM 79-21-06-000-801-F00 AND FOUND NO DEBRIS IN FILTER OR IN FILTER BOWL FOR #1 ENGINE.  REMOVED & INSPECTED E1 OIL SCAVENGE FILTER NO DEFECTS NOTED. SCAVENGE FILTER REINSTALLED & LEAKS CHECKS GOOD IAW AMM 79-21-06/401.   DURING ENG 1 ENGINE RUN, OIL BYPASS BYPASS WARNING ILLUMINATED ON ENGINE DISPLAY. REF FIM 79-05 TASK 817,  REPLACED NR 1 ENGINE SCAVANGE OIL FILTER CLOGGING TRANSMITTER IAW OIL FILTER BYPASS MESSAGE DID NOT APPEAR DURING 5 MINS AT AMM 79-21-07-400-801-F00. ENG IDLE LEAK CHECK PASSED. IDLE POWER. NO LEAKS FROM TRANSMITTER.

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