# SDR AALA202109291830

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 26, 2021
- Submitted: September 29, 2021
- Operation: Air carrier
- Aircraft: [N422AN](https://openairdocs.org/aircraft/N422AN), registered now
- Make and model: Airbus A321-253NX
- Registry model: [Airbus A321-253NX](https://openairdocs.org/model/airbus-a321-253nx) (OpenAirDocs)
- Aircraft serial: 10159
- Aircraft time: 2,699 hours, 740 cycles
- System (JASC): [2820 · Aircraft Fuel Distribution System](https://openairdocs.org/jasc/2820)
- Part: Selector
- Part number: 74438311
- Part serial: 744383IN00302
- Condition: Defective
- Location: Zone 100 - Fuse
- Part time: 2,701 hours, 741 cycles
- Stage of operation: CR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202109291830

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: UNWANTED FUEL TRANSFER FROM RIGHT WING TO LEFT WING WITH CROSS FEED VALVE INDICATING CLOSED. ONCE CENTER TANK DRY HAD 400 LBS/HR INCREASE BURN FROM RIGHT TANK. INCREASED TO 600 LBS/HR. APPROX. 3000 LB IMBALANCE LAST THREE HOURS OF FLIGHT. **ORIGINAL REPORT AALA202109284213**: REPLACED AUXILIARY LEVEL SENSING CONTROL UNIT AND REFUEL PRESELECTOR PER AMM 28-46-35 AND AMM 28-42-21. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.

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