# SDR AALA201904169001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 15, 2019
- Submitted: April 16, 2019
- Operation: Air carrier
- Aircraft: [N916US](https://openairdocs.org/aircraft/N916US), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6420
- Aircraft time: 15,159 hours, 5,908 cycles
- System (JASC): [2440 · External Power System](https://openairdocs.org/jasc/2440)
- Part: Control Unit
- Part number: 1700667D
- Part serial: 6888
- Condition: Burned Out
- Location: Electrical
- Part time: 15,157 hours, 5,907 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201904169001

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT REPORTS STRONG SMELL OF ELECTRICAL BURNING IN COCKPIT. MAINTENANCE TROUBLESHOT IAW CARD 26L00021001. FOUND GAPCU 24XG INOP WITH BURNED ELECTRICAL SMELL. REMOVED AND REPLACED GAPCU IAW AMM 24-41-34. OPS CHECK GOOD.

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