# SDR USAASB97015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 15, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N524AU
- Make and model: Boeing 737-3B7
- Registry model: [Boeing 737-3B7](https://openairdocs.org/model/boeing-737-3b7) (OpenAirDocs)
- Aircraft serial: 23859
- System (JASC): [2824 · Fuel Transfer Valve](https://openairdocs.org/jasc/2824)
- Part: Actuator
- Part number: EM4874
- Condition: Malfunctioned
- Location: Ctr Fuel Tank
- Stage of operation: CR
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAASB97015

## Discrepancy

ABQ - FL 7881 - A/C WAS BEING MX FERRIED FROM ABQ TO PIT WITH FUEL CROSSFEED VALVE INOP (CLOSED).  WHILE EN ROUTE, THE FLT CREW NOTICED THAT FUEL WAS MIGRATING FROM THE CENTER TANK INTO THE AUXILLIARY TANK, GRADUALLY FILLING UP TO 3,100 POUNDS.  A DECISION WAS MADE TO RETURN TO FIELD AT ABQ TO VERIFY PROBLEM.  NO EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT FURTHER INCIDENT.  MAINTENANCE REMOVED AND REPLACED THE CROSSFEED VALVE ACTUATOR AND THE ELECTRONIC CONTROL BOX FOR THE PATS AUXILLARY TANK.  PERFORMED COMPLETE SYSTEM TEST PER PATS MANUAL.  OPERATIONAL CHECK GOOD.  ALL VALVES OPERATE NORMAL.  (M)

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