# SDR AALA202603106471

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 6, 2026
- Submitted: March 10, 2026
- Operation: Air carrier
- Aircraft: [N934AN](https://openairdocs.org/aircraft/N934AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29531
- Aircraft time: 69,618 hours, 29,739 cycles
- Engine: Cfmint CFM567B242
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Pressure Switch
- Condition: Faulty
- Location: Fuel Sys
- Stage of operation: CL
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202603106471

## Discrepancy

AIRCRAFT WAS GROUNDED: LEFT FILTER BYPASS LIGHT ILLUMINATED IN FLIGHT DURING CLIMB FROM FL380 TO FL400. INSTALLED ENGINE NUMBER 1 FUEL FILTER DIFFERENTIAL PRESSURE SWITCH. PER AMM 73-34-01, OPS TEST GOOD.

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