# SDR AALA201909179006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 16, 2019
- Submitted: September 18, 2019
- Operation: Air carrier
- Aircraft: [N165US](https://openairdocs.org/aircraft/N165US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1431
- Aircraft time: 62,039 hours, 23,369 cycles
- System (JASC): [2424 · AC Regulator](https://openairdocs.org/jasc/2424)
- Part: Gcu
- Part number: 740120C
- Part serial: 5239
- Condition: Failed
- Location: Zone 100
- Part time: 60,078 hours, 25,474 cycles
- 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/AALA201909179006

## Discrepancy

AIRCRAFT WAS GROUNDED: FLIGHT DIVERTED TO BNA ON ACCOUNT OF APU SHUT DOWN AND NUMBER TWO GENERATOR ON PLACARD. AN EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE #2 ENGINE GCU IAW AMM 24-22-34. OPS CHECK OK. REMOVED AND REPLACED LOW OIL PRESSURE SWITCH IAW AMM 49-94-14. OPS CHECK OK. (SEE SDR # AALA201909189019)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.