# SDR UALA2012012300443

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2012
- Submitted: February 24, 2012
- Operation: Air carrier
- Aircraft: [N406UA](https://openairdocs.org/aircraft/N406UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 454
- Aircraft time: 59,959 hours, 22,535 cycles
- Engine: Iae V2527A5
- System (JASC): [2824 · Fuel Transfer Valve](https://openairdocs.org/jasc/2824)
- Part: Control Unit
- Part number: 3004200000501
- Part serial: 23197
- Condition: Faulty
- Location: Fuel System
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012012300443

## Discrepancy

LEFT FUEL IS 1100 LBS LESS THAN RIGHT TANK DURING CRUISE AND DESCENT.  FUEL ERROR READING LEFTW-49 RIGHT W-2400.  BURN EQUAL AND LOAD EQULAT TAXI.  TROUBLESHOOT REF TSM.  SWAPPED FLSCU 1&2 SYS TEST NO FAULTS.  TESTED FUEL TRANS VLVS PER TSM.  NO LEAKS NOTED NEED FURTHER TS.  APPROX 800 LBS USED FROM RT TANK ON NEXT FLIGHT ( 3 HOURS).  TANK ENTRY NEEDED.  SEE-FEEL INDICATOR ON XFEED VLV.  ALSO MAKE SURE OUTER CELLS ARE FULL & INTERCELL XFR VLVS NORMAL BEFORE ACP TSM.  REPLACED LEFT WING REFUEL VALVE PER MM.  COULD NOT DUPLICATE UNWANTED FUEL TRANSFER.  OPS 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.