# SDR 99UAL900616

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 29, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N444UA](https://openairdocs.org/aircraft/N444UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 824
- Engine: Iae V2527A5
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: Failed
- Location: Cabin
- Component: Diehl Gmbh &, 321454
- Stage of operation: IN
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900616

## Discrepancy

EMERGENCY LIGHT TEST FAILS EPSU COM L.  *S/D*  EMERGENCY POWER SUPPLY UNIT (11WL) WAS FOUND FAULTED DURING TEST WITH MESSAGE EPSU COM L SHOWN.  THE UNIT WAS REPLACED AND CHECKED NORMAL.

---
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.