# SDR AALA201706209011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 18, 2017
- Submitted: June 26, 2017
- Operation: Air carrier
- Aircraft: [N824AN](https://openairdocs.org/aircraft/N824AN), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 40643
- Aircraft time: 1,964 hours, 202 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 100260201
- Condition: Failed
- Location: L1 Door
- Stage of operation: UK
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201706209011

## Discrepancy

AIRCRAFT WAS NOT GROUNDED.  AIRPLANE HEALTH MONITORING ALERT RECEIVED FOR L1 DOOR PRIME WIRELESS EMERGENCY LIGHTS SYSTEM CONTROL UNIT BATTERY POWER FAILURE.  **SUPPLEMENTAL - 06/23/17 - REMOVED AND REPLACED WELS CONTROL UNIT BATTERY IAW AMM 33-51-07.  OPERATIONAL CHECK GOOD.  (CLOSED)

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