# SDR AALA2020072069015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 15, 2020
- Submitted: July 21, 2020
- Operation: Air carrier
- Aircraft: [N784AN](https://openairdocs.org/aircraft/N784AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 29588
- Aircraft time: 81,023 hours, 9,772 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702001
- Part serial: 168615
- Condition: Unserviceable
- 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/AALA2020072069015

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE, BATTERY DISCHARGED, R3 DOOR EPSU (EMERGENCY POWER SUPPLY UNIT), M33404.  REMOVED AND REPLACED EPSU M33404 PER AMM 33-51-06, OPERATIONAL CHECK GOOD.

---
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.