# SDR CALA2026021613820

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 14, 2026
- Submitted: February 16, 2026
- Operation: Air carrier
- Aircraft: [N2639U](https://openairdocs.org/aircraft/N2639U), registered now
- Make and model: Boeing 777-300ER
- Registry model: [Boeing 777-300ER](https://openairdocs.org/model/boeing-777-300er) (OpenAirDocs)
- Aircraft serial: 62650
- Aircraft time: 37,657 hours, 4,130 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- 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/CALA2026021613820

## Discrepancy

THE AFT EMERGENCY LIGHT POWER SUPPLY BATTERY PACK (M33401) AT THE DOOR 4R FOUND LOW CAPACITY.  REPLACED THE AFT EMERGENCY LIGHT POWER SUPPLY BATTERY PACK, TESTED NORMAL IAW AMM 33-51-06-960-802, REV.106.

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