# SDR CALA2026021713824

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 13, 2026
- Submitted: February 17, 2026
- Operation: Air carrier
- Aircraft: [N26906](https://openairdocs.org/aircraft/N26906), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34829
- Aircraft time: 52,170 hours, 6,561 cycles
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Control Unit
- Part number: 100260103
- Condition: Faulted
- 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/CALA2026021713824

## Discrepancy

SEAT 33DEF TO 38DEF EMERGENCY LIGHTS DO NOT ILLUMINATE WHEN SET TO ON.  WCU AT THE SEAT PAN 43D SWAPPED TO WCU AT SEAT PAN 39D,  MAINT MSG:33-11726 WAS ERASED. NEW WCU  REPLACED ON  SEAT PAN 39D. ORIGINAL WCU ON SEAT PAN 43D RESTORED BACK.   MAINT MSG:33-13126 TRIGGERED AFTER WELS SYS STABILIZED.  WCU SOFTWARE LOADING CARRIED OUT IAW AMM B787-A-33-51-07-04A-750A-A INTO PRIMARY WCU AT DOOR 1L,2R,3L,4R.  SOFTWARE CONFIGURATION CHECKED & MAINT MESS 33-13126 CLEARED. EMERGENCY LIGHTS OPS TESTED SATISFACTORY.

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