# SDR CALA2025032003000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 19, 2025
- Submitted: March 20, 2025
- Operation: Air carrier
- Aircraft: [N2331U](https://openairdocs.org/aircraft/N2331U), registered now
- Make and model: Boeing 777-300ER
- Registry model: [Boeing 777-300ER](https://openairdocs.org/model/boeing-777-300er) (OpenAirDocs)
- Aircraft serial: 62642
- Aircraft time: 34,764 hours, 3,781 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/CALA2025032003000

## Discrepancy

EMERGENCY LIGHTS - OPERATIONAL TEST WITH THE TEST SWITCHES PROCEDURE - FOUND BATTERY PACK M33406 INOP. RELATED EMERGENCY LT INOP OVER DOOR AREA, MAIN AISLE, MED 4L EXIT SIGN & MASTER CALL EXIT SIGN MED L& R. REF SSM 33-51-15-103. REPLACED WITH A NEW BATTERY PACK IN DOOR 4L M33406 POSITION AND CHK FUNCTION NORMAL

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