# SDR ASAA2025021055817

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2025
- Submitted: February 11, 2025
- Operation: Air carrier
- Aircraft: [N278AK](https://openairdocs.org/aircraft/N278AK), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44113
- Aircraft time: 26,206 hours, 8,355 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: ADD71701100
- Condition: Inoperative
- 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/ASAA2025021055817

## Discrepancy

CUSTOMER WALK ITEM: EMERGENCY LIGHT ABOVE 27LH DOES NOT ILLUMINATE WHEN SELECTED. GROUNDED - YES. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK FOR POWER SUPPLY M2626 S/N 437601 IAW BOEING 737-900 AMM 33-51-06-960-805. LIGHT OP CHECK SUCCESSFUL IAW STEP 4E(6) BOEING 737-900 AMM 33-51-06-960-805.

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