# SDR AALA202112018929

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 30, 2021
- Submitted: December 1, 2021
- Operation: Air carrier
- Aircraft: [N821AN](https://openairdocs.org/aircraft/N821AN), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 40640
- Aircraft time: 19,156 hours, 2,193 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Condition: Fault Message
- Location: Zone 200 - Fuse
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202112018929

## Discrepancy

AIRCRAFT WAS GROUNDED: WHILE PERFORMING WORK CARD 78T21033001 FOUND MAINTENANCE MESSAGE 33-11211 CLASS II INTERNAL FAULT AND MAINTENANCE MSG 33-11411 CLASS II WIRELESS CONTROL UNIT BATTERY POWER HAS FAILED. REMOVED AND REPLACED WIRELESS BATTERY UNIT'S AT 11.1. (AALA202112014056) AND 11.3 PER AMM 33-51-07 OPERATIONS CHECKS NORMAL.

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