# SDR CA990310041

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 24, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Make and model: Boeing 747475
- System (JASC): [2820 · Aircraft Fuel Distribution System](https://openairdocs.org/jasc/2820)
- Part: Valve
- Condition: Failed
- Location: Fuel System
- Stage of operation: TX
- Nature of condition: K
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA990310041

## Discrepancy

(CAN) PRIOR TO PUSHBACK, FUEL SPILL OCCURRED FROM SURGE TANK VENT HOLE.  NR 3 FUEL TANK OVERFILL DUE TO UNCOMMANDED FUEL TRANSFER.  AIRCRAFT HAD JUST COMPLETED MAINT AND NR 3 JETTISON OVERRIDE PUMP HOUSING AND CHECK VALVE REPLACED.  SEALS RUPTURED DUE TO OVERTORQUING OF SCREWS. SCREWS SHEARED AND BELOW CHECK VALVE.  SEAL REPLACED AND VALVE PROPERLY TORQUED.

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