# SDR CALA2026051516283

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 14, 2026
- Submitted: May 18, 2026
- Operation: Air carrier
- Aircraft: [N28987](https://openairdocs.org/aircraft/N28987), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 66146
- Aircraft time: 25,580 hours, 2,479 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: AD100260201
- Part serial: 7611
- Condition: Inoperative
- Location: Zone 200
- Part time: 6,588 hours, 653 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026051516283

## Discrepancy

EMERGENCY LIGHTS FLOOR PROXIMITY LIGHT DOESNT TURN ON AT POSITIONS: 50FED, 51FED, 52FED, 53FED, 54FED, 55FED, 56FED AND 57FED. ACCOMPLISHED FIM DMC-B787-A-33-50-F1-87A-421A-A AND FOUND REMOTE WELS CONTROL UNITED BATTERY POWER IS FAILED AT POSITION #29. REMOVED AND REPLACED WIRELESS EMERGENCY LIGHTING SYSTEM CONTROL UNIT AND BATTERY UNIT. IAW AMM FAULT:33-11429 DMC-B787-A-33-51-07-01B-520A-A/720A-A. AFTER TESTS ITEM GOOD FOR SERVICE.

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