# SDR AALA202601094879

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 8, 2026
- Submitted: January 9, 2026
- Operation: Air carrier
- Aircraft: [N964NN](https://openairdocs.org/aircraft/N964NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31210
- Aircraft time: 32,527 hours, 13,612 cycles
- System (JASC): [2840 · Fuel Indicating System](https://openairdocs.org/jasc/2840)
- Part: Processor
- Part number: 3012803
- Part serial: 0767
- Condition: False Indication
- Location: Zone 200
- Part time: 10,946 hours, 5,262 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202601094879

## Discrepancy

AIRCRAFT WAS GROUNDED: LEFT FUEL TANK INDICATOR PERIODICALLY SHOWS A QUANTITY VALUE IT FLAGS A FUEL IMBALANCE AND MULTIPLE MESSAGES IN THE FMS. GROUND TEST OF FQIS SYSTEM FAULTED WITH MSG # 28-41115 (ARINC OUTPUT BUS FAIL). ACCOMPLISHED TEST OF REFUEL QUANTITY INDICATORS, DEU SELF TEST AND FMC OPS TEST, PER FIM 28-41-00-810-810 WITH NO FAULTS. REPLACED FUEL QUANTITY PROCESSOR UNIT, PER AMM 28-41-81. GROUND TEST PASSED.

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