# SDR CALA2025041803981

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 17, 2025
- Submitted: April 21, 2025
- Operation: Air carrier
- Aircraft: [N77431](https://openairdocs.org/aircraft/N77431), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 32833
- Aircraft time: 51,647 hours, 18,333 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: ADD71701100
- Part serial: 222903
- Condition: Discharged
- 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/CALA2025041803981

## Discrepancy

EMERGENCY LIGHTING SYSTEM FAIL FUNCTIONAL CHECK M1671 (REF AAR N R 1000030860). REMOVED AND INSTALLED EMER BATTERY PACK ASSY IAW B737 AMM 33-51- 06-960-805. TEST OK. (M1671)  BATTERY PACK FAILED FUNCTIONAL CHECK DURING D CHECK IN RFD. REMOVED AND INSTALLED EMER BATTERY PACK ASSY IAW B737 AMM 33-51- 06-960-805. TEST OK (M1671).

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