# SDR CALA2025112811558

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 27, 2025
- Submitted: November 28, 2025
- Operation: Air carrier
- Aircraft: [N2534U](https://openairdocs.org/aircraft/N2534U), registered now
- Make and model: Boeing 777-300ER
- Registry model: [Boeing 777-300ER](https://openairdocs.org/model/boeing-777-300er) (OpenAirDocs)
- Aircraft serial: 62645
- Aircraft time: 36,808 hours, 4,060 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: D71701100
- Condition: No Test
- Location: Zone 200
- 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/CALA2025112811558

## Discrepancy

OFCR EMERGENCY POWER SUPPLY BATTERY PACK 2 (M33145) FAIL TEST.  BATTERY PACK REPLACED. INSTALLATION TEST CARRIED OUT FOR BATTERY PACK (M33145) IAW AMM 33-51-00,FOUND WORKING SATISFACTORY.

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