# SDR CALA2026020313530

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2026
- Submitted: February 3, 2026
- Operation: Air carrier
- Aircraft: [N37474](https://openairdocs.org/aircraft/N37474), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 31648
- Aircraft time: 40,942 hours, 14,790 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [7334 · Fuel Pressure Sensor](https://openairdocs.org/jasc/7334)
- Part: Pressure Switch
- Part number: APS73B18BARD
- Part serial: 84441252
- Condition: Faulted
- Location: Nr 1 Eng Fuel
- Part time: 11,289 hours, 4,350 cycles
- Stage of operation: CR
- 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/CALA2026020313530

## Discrepancy

LEFT FUEL FILTER BYPASS LIGHT ILLUMINATED.  PERFORMED T/S IAW FIM 73-05 TASK 801, FOUND NR 1 ENG FUEL FILTER DIFFERENTIAL PRESSURE SWITCH (FFDPS) DEFECTIVE (INTERNAL SHORT), R & R THE NR 1 ENG FFDPS IAW AMM 73-43-01,  REPLACED NR 1 ENG FUEL FILTER IAW AMM 73-11-02, AS A PRECAUTION, OPS & LEAK CHKD NORMAL, IAW AMM 71-00-00.

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