# SDR AALA201609219004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 17, 2016
- Submitted: September 21, 2016
- Operation: Air carrier
- Aircraft: N936UW
- Make and model: Boeing 757-2B7
- Registry model: [Boeing 757-2B7](https://openairdocs.org/model/boeing-757-2b7) (OpenAirDocs)
- Aircraft serial: 27244
- Aircraft time: 72,074 hours, 27,401 cycles
- System (JASC): [2824 · Fuel Transfer Valve](https://openairdocs.org/jasc/2824)
- Part: Shutoff Valve
- Condition: Defective
- Location: Fuel System
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201609219004

## Discrepancy

LEFT WING FUEL IMBALANCE WHEN CENTER FUEL USED. IMBALANCE SEEMED TO TERMINATE WHEN CENTER FUEL AT 11,000 LBS. OPERATES NORMAL WITH CENTER FUEL AT 0 AND BALANCED.  NO FUEL LEAK PERCIEVED.  AIRCRAFT WAS GROUNDED.  MAINTENANCE REPLACED THE AFT CROSSFEED VALVE, FORWARD CROSSFEED VALVE AND THE LEFT FUEL PUMP VAPOR RETURN LINE.

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