# SDR CALA2025022002406

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 18, 2025
- Submitted: February 21, 2025
- Operation: Air carrier
- Aircraft: [N26902](https://openairdocs.org/aircraft/N26902), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34822
- Aircraft time: 47,283 hours, 5,900 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 100260201
- Part serial: ST20044600
- Condition: No Test
- Location: Zone 200
- Part time: 16,863 hours, 2,179 cycles
- 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/CALA2025022002406

## Discrepancy

WELS BATTERY 9.1 FOUND DEGRADED WHILE TROUBLESHOOTING EMERGENCY BATTERY SYSTEM.   REMOVED AND REPLACED WELS BATTERY CLASS 9 IAW AMM 33-51-07-02B-520A-A. OPS CHECK GOOD.

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