# SDR AALA202605259091

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 21, 2026
- Submitted: May 26, 2026
- Operation: Air carrier
- Aircraft: [N955NN](https://openairdocs.org/aircraft/N955NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31199
- Aircraft time: 34,109 hours, 14,292 cycles
- System (JASC): [2822 · Fuel Boost Pump](https://openairdocs.org/jasc/2822)
- Part: Pressure Switch
- Part number: ASP4560
- Condition: Faulted
- Location: Zone 500 Fuel
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202605259091

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: WHILE ATTEMPTING TO BALANCE FUEL THE CROSSFEED VALVE OPEN LEFT AFT AND FORWARD FUEL PUMPS TURNED OFF. ALSO, THE AFT LOW PRESSURE LIGHT DID NOT ILLUMINATE WHEN FUEL PUMP TURNED OFF. REMOVE AND REPLACED LEFT HAND AFT FUEL BOOST PUMP PRESSURE SWITCH. PER 28-42-11.

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