# SDR CALA2026042015490

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 17, 2026
- Submitted: April 20, 2026
- Operation: Air carrier
- Aircraft: [N29907](https://openairdocs.org/aircraft/N29907), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34830
- Aircraft time: 51,950 hours, 6,345 cycles
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Wire Harness
- Condition: Faulted
- Location: Zone 200
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026042015490

## Discrepancy

FOUND FLOOR PROXIMITY LIGHT WIRE BROKEN AT TEMINAL (AIRCRAFT SIDE) SEAT 30D. RETERMINATED CONTACTS AND REPLACED FLOOR PROXIMITY LIGHT, REF AMM 33-51-06. NO HELP. FLOOR PROX LIGHT AT 30D STILL INOP.  EMERGENCY LIGHTS GND TEST FAILED. MX MSG: 33-11624 EMERGENCY LIGHTS ARE OUT AT MIDDLE ROWS 30-31 AND 32 BOTH LT & RT. DISCONNECTED GROUND PROX LIGHTS INDIVIDUALLY IN ALL AFFECTED ROWS, NO HELP, RELOADED WELS OPS SOFTWARE REF AMM 33-51-07, NO HELP. CORRELATED FAULT IS FOR WELS UNIT 24, SUSPECT WELS CONTROL UNIT 24.2 FAILURE. REPLACED WIRELESS EMER LIGHT CONTROL UNIT 24.2 AT ROW 22, IAW M M33-51-07-01A-, NO HELP SEAT SIDE MARKER AT ROW 30, 31, 32 BOTH ISLES ARE STILL INOP.  TRIED TO RECREATE THE FAULT  BY DISCONNECTING THE WIRE HARNESS THAT GOES FROM REMOTE WCU 24.1 TO SEAT ROWS 30 THRU 32 & FOUND SIMILAR RESULTS TO EMERGENCY LIGHTS NOT ILLUMINATING. SUSPECT BAD WIRING BETWEEN CONTROLLER AND FLOOR PROXIMITY LIGHTS. REF IPC 25-25-02-51B-941A ITEM NUMBER 215 P/N 8-2157015-1. BAD HARNESS IS LOCATED BETWEEN ROW 22 AND ROW 30, CENTER SEAT GROUP, THE LT SEAT TRACK. FOUND LEFT SEAT TRACK CONNECTOR AT ROW 30 NOT FULLY SEATED, RESEATED CONNECTOR AND LIGHTS AT 30F, 31D/F, AND 32D/F NOW OPS. FOUND WIRE TERMINATIONS AT 30D EMERGENCY LIGHT TO BE REVERSED, RETERMIN POLARITY AND REPLACED FLOOR PROX LIGHT AT 30D IAW AMM 33-51-06. ALL PREVIOUSLY STATED INOP LIGHTS NOW OPERABLE. OPS CHECKS OK

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