# SDR AALA20170228004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 28, 2017
- Submitted: March 1, 2017
- Operation: Air carrier
- Aircraft: [N859NN](https://openairdocs.org/aircraft/N859NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33314
- Aircraft time: 15,654 hours, 6,157 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Epsu
- Part number: 32146210
- Condition: Failed
- Location: Cabin
- 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/AALA20170228004

## Discrepancy

AIRCRAFT WAS NOT GROUNDED. EMERGENCY POWER SUPPLY UNIT AT 13WL FAILED TEST. REMOVED AND REPLACED EPSU IAW AMM 33-51-38. OPERATIONAL CHECK GOOD.

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