# SDR USAA2013011000022

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 9, 2013
- Submitted: January 10, 2013
- Operation: Air carrier
- Aircraft: [N178US](https://openairdocs.org/aircraft/N178US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1519
- Aircraft time: 41,130 hours, 14,936 cycles
- System (JASC): [2440 · External Power System](https://openairdocs.org/jasc/2440)
- Part: Relay
- Part number: E0245115B0
- Condition: Defective
- Location: Electrical Sys
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2013011000022

## Discrepancy

WHEN STARTING APU, EMERGENCY LIGHT CABIN (H-7) CIRCUIT BREAKER POPPED - ON POWER TRANSFER, H-10  CIRCUIT BREAKER ALSO POPPED.  REMOVED AND REPLACED CONTROL RELAY 21XG IAW ELECTRICAL STANDARD PRACTICES MANUAL & EWM 24-41-03.

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