# SDR AALA202501304927

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 28, 2025
- Submitted: January 30, 2025
- Operation: Air carrier
- Aircraft: [N960AN](https://openairdocs.org/aircraft/N960AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29542
- Aircraft time: 67,263 hours, 28,469 cycles
- System (JASC): [2820 · Aircraft Fuel Distribution System](https://openairdocs.org/jasc/2820)
- Part: Bypass Valve
- Condition: Faulty
- Location: Fuel Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202501304927

## Discrepancy

AIRCRAFT WAS GROUNDED: RIGHT MAIN FUEL TANK INCREASED FUEL BY 400-500 LBS DURING FLIGHT WITH NO CHANGE IN FUEL PANEL CONFIGURATION, EACH ENGINE WAS CONFIGURED TO BURN FROM EACH TANK SEPARATELY. ON DECENT, FUEL QUANTITY ON NUMBER 2 MAIN TANK WAS INCREASING, NO FUEL ON THE CENTER TANK. AND NO ABNORMAL FUEL USAGE ON NUMBER 1 MAIN TANK. POSSIBLE FUEL QUANTITY INDICATION PROBLEM. **SUPPLEMENTAL REPORT FOR (AALA202501299860): REMOVED AND REPLACED FORWARD (AALA202501299860) AND AFT (AALA202501304517) BOOST PUMP CHECK VALVES AND RIGHT HAND BOOST PUMP BYPASS VALVE (AALA202501304927). PER AMM 28-22-71 AND 28-22-61 BY TANK TIGERS VENDOR ON W/O TT 01150 LEAK AND OPERTIONAL CHECKS NORMAL**(CLOSED).

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