# SDR UIEA2020073101662

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2020
- Submitted: July 31, 2020
- Operation: Air carrier
- Aircraft: [N471MC](https://openairdocs.org/aircraft/N471MC), registered now
- Make and model: Boeing 747412
- Aircraft serial: 26557
- Aircraft time: 79,889 hours, 12,703 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 20131A
- Part serial: TLS23041
- Condition: Inoperative
- Location: Emergency Light
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2020073101662

## Discrepancy

FOUND EMERGENCY LIGHT AT UPPER DECK NOT ILLUMINATING AFT ELEC IAW AMM 33-51-04-902-001-001, REV 99.  REPLACED THE BATTERY AND CONDITION CHECK NORMAL IAW AMM 33-51-04-902-001-001, REV 99.  PERFORMED POWER SUPPLY TEST AND RESULT WAS SATISFACTORY.

---
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.