# SDR AALA202010259017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 22, 2020
- Submitted: October 26, 2020
- Operation: Air carrier
- Aircraft: [N534UW](https://openairdocs.org/aircraft/N534UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3989
- Aircraft time: 39,545 hours, 14,304 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Gcu
- Part number: 767584J
- Part serial: AAAY005675
- Condition: Defective
- Location: Nr 1
- Part time: 41,850 hours, 14,915 cycles
- Stage of operation: CR
- 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/AALA202010259017

## Discrepancy

AIRCRAFT WAS GROUNDED.  IN CRUISE FL320, SUDDEN JOLT/YAW FOLLOWED BY MASTER CAUTION.  ENGINE GEN 1 FAULT ECAM.  RESET GEN 1, PER ECAM, ANOTHER JOLT/YAW AND GENERATOR CAME BACK ON.  REMOVE AND REPLACE THE GCU1 (1XU1), PER AMM 24-22-34.  OPERATIONS CHECK OF THE GAPCU VIA THE CFDS TEST PASSED AND NO CLASS 3 FAULTS.

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