# SDR USAA2011121200021

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2011
- Submitted: December 12, 2011
- Operation: Air carrier
- Aircraft: [N939UW](https://openairdocs.org/aircraft/N939UW), registered now
- Make and model: Boeing 757-2B7
- Registry model: [Boeing 757-2B7](https://openairdocs.org/model/boeing-757-2b7) (OpenAirDocs)
- Aircraft serial: 27303
- System (JASC): [2460 · DC Power Distribution System](https://openairdocs.org/jasc/2460)
- Part: Circuit Breaker
- Condition: Popped
- Location: Cockpit
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2011121200021

## Discrepancy

PHL - FLT 751  EN ROUTE BRU TO PHL.  ON DESCENT, THE FLIGHT DECLARED AN EMERGENCY DUE TO EICAS MESSAGES "APU BLEED VAL", "L HYD ELE PUMP", "C HYD ELE 2", "ANTI-SKID", "PROBE HEAT", "RT UTIL BUS OFF", "R RECIRC FAN", AND "L ENG EEC".  THE CIRCUIT BREAKER FOR THE RIGHT DC BUS SECT 1 WAS THEN FOUND POPPED.  THE FLIGHT LANDED WITHOUT FURTHER INCIDENT.  MAINTENANCE RESET THE DC BUS SECT 1 CIRCUIT BREAKER.  OPERATIONALLY CHECKS NORMAL.  NO FAULTS WERE NOTED.

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