# SDR AALA202601070159

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 6, 2026
- Submitted: January 7, 2026
- Operation: Air carrier
- Aircraft: [N820NN](https://openairdocs.org/aircraft/N820NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29559
- Aircraft time: 47,274 hours, 20,144 cycles
- System (JASC): [2842 · Fuel Quantity Sensor](https://openairdocs.org/jasc/2842)
- Part: Pressure Switch
- Part number: 21C1322
- Condition: Faulty
- Location: Zone 100
- Stage of operation: CR
- How discovered: V
- Nature of condition: J, S, K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202601070159

## Discrepancy

AIRCRAFT WAS GROUNDED: IN FLIGHT WHEN BALANCING FUEL THE RIGHT AFT MAIN FUEL PUMP LOW PRESSURE LIGHT DOES NOT ILLUMINATE. REMOVED AND REPLACED RIGHT HAND AFT MAIN PUMP LOW PRESSURE SWITCH. PER AMM 28-42-11. OPERATIONAL AND LEAK CHECK GOOD.

---
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.