# SDR KCSA2026090253

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 2, 2026
- Submitted: September 2, 2026
- Operation: Air carrier
- Aircraft: [N766CK](https://openairdocs.org/aircraft/N766CK), registered now
- Make and model: Boeing 747481F
- Aircraft serial: 34016
- Aircraft time: 72,389 hours, 13,884 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Condition: Inoperative
- Location: Zone 200
- 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/KCSA2026090253

## Discrepancy

WHILE WORKING A LIGHTING ISSUE, FME DISCOVERED CENTER EMERGENCY LIGHTING ON CEILING EXIT LIGHT DOES NOT ILLUMINATE W/ EMERGENCY LIGHTS ON.  REMOVED BATTERY PACK & REINSTALLED IAW B747-400 AMM 33-51-00, REPLACED BATTERY POWER SUPPLY FUSES IAW AMM 33-51-00 & TESTED EMERGENCY LIGHTS AND SIGNS, OK IAW AMM 33-51-00, SIGN ILLUMINATES.

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