# SDR CALA2025100109502

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 30, 2025
- Submitted: October 1, 2025
- Operation: Air carrier
- Aircraft: [N2331U](https://openairdocs.org/aircraft/N2331U), registered now
- Make and model: Boeing 777-300ER
- Registry model: [Boeing 777-300ER](https://openairdocs.org/model/boeing-777-300er) (OpenAirDocs)
- Aircraft serial: 62642
- Aircraft time: 36,912 hours, 4,012 cycles
- System (JASC): [3320 · Passenger Compartment Lighting](https://openairdocs.org/jasc/3320)
- Part: Battery Pack
- Part number: D71701100
- Condition: Discharged
- 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/CALA2025100109502

## Discrepancy

OFCR BACKUP POWER SUPPLY BATTERY,  FOUND TO HAVE LOW CAPACITY.  REPLACED OFCR BACKUP POWER SUPPLY BATTERY PACK AND TESTED NORMAL IAW AMM 33-29-10-960-810,  REV 104.

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