# SDR CALA2026090819301

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 7, 2026
- Submitted: September 8, 2026
- Operation: Air carrier
- Aircraft: [N2138U](https://openairdocs.org/aircraft/N2138U), registered now
- Make and model: Boeing 777-300ER
- Registry model: [Boeing 777-300ER](https://openairdocs.org/model/boeing-777-300er) (OpenAirDocs)
- Aircraft serial: 62649
- Aircraft time: 39,078 hours, 4,186 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702001
- 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/CALA2026090819301

## Discrepancy

OFAR BACKUP LIGHTS COMMON AREA LEFT, BUNKS 1, 3, AND 5 DO NOT COME ON.   REMOVED AND REPLACED LEFT OFAR BATTERY PACK M33143, OP CHECK GOOD, BACKUP LIGHTS NORMAL OPERATION REF AMM 33-29-12-960-809.

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