# SDR 2002UALA00774

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2002
- Submitted: May 22, 2002
- Operation: Air carrier
- Aircraft: [N306UA](https://openairdocs.org/aircraft/N306UA), registered now
- Make and model: Boeing 737322
- Aircraft serial: 23667
- Aircraft time: 45,539 hours, 26,436 cycles
- Engine: Ge CFM56*
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Circuit Breaker
- Part number: BACC18AE35
- Condition: Failed
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002UALA00774

## Discrepancy

DIVERTED TO DEN DUE TO ELECTRICAL PROBLEMS.  CREW REPORTED NR 2 TRANSFER BUS CIRCUIT BREAKER (C821) POPPED IN CRUISE & IN SMOOTH AIR.  REPORTED LOSING FIRST OFFICER'S INSTRUMENTS INCLUDING EADI AND EHSI.  THE AIRCRAFT WAS DIVERTED TO DEN WITHOUT INCIDENT.  AMT CREWS COULD NOT ISOLATE CAUSE OF FAILURE / DUPLICATE PROBLEM.  THE CIRCUIT BREAKER WAS REPLACED AS PRECAUTIONARY, AND THE AIRCRAFT WAS RETURNED TO SERVICE.

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