# SDR CALA2026073018100

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2026
- Submitted: July 30, 2026
- Operation: Air carrier
- Aircraft: [N77012](https://openairdocs.org/aircraft/N77012), registered now
- Make and model: Boeing 777224
- Aircraft serial: 29860
- Aircraft time: 124,098 hours, 12,589 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: ADD71701100
- 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/CALA2026073018100

## Discrepancy

DURING OPERATIONAL TEST OF THE EMERGENCY LIGHTS, SEVERAL LIGHTS DO NOT TURN ON AT L3 DOOR AND CEILING NEAR TO L3 DOOR.   FAULT ISOLATION PERFORMED IAW FIM 33-51 TASK 806. FOUND M33405 EMERGENCY POWER SUPPLY INOPERATIVE. M33405.  BATTERY PACK REPLACED IAW AMM 33-51-06-960-802. TEST OK.

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