# SDR CALA2021021900188

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 18, 2021
- Submitted: February 19, 2021
- Operation: Air carrier
- Aircraft: [N845UA](https://openairdocs.org/aircraft/N845UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 1585
- Aircraft time: 60,418 hours, 26,346 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32145410
- Part serial: 4333
- Condition: No Test
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2021021900188

## Discrepancy

DURING CHECK OF THE EMERGENCY POWER SUPPLY UNITS BITE CHECK FAILED FOR 10WL (ATA 33-51-38 EPSU UNIT FWD L) PER HAECO LCQ NON-ROU TINE 9296935/38935.  REMOVED AND REPLACED EPSU OWR SUPPLY UNIT 10WL IAW A319/A320 AMM 33-51-38 OPS TEST GOOD IAW A319/A320 AMM 33-51-00-710-001-A. ME CH V925039 ROTABLE PARTS CHANGE WAS INDICATED - TT 1212656  SN OFF 4333 POWER SUPPLY, C  OFF 31-3350-9-9001 4333 ON 31-3350-9-9001 4744.

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