# SDR ASAA2026081067916

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 10, 2026
- Submitted: August 11, 2026
- Operation: Air carrier
- Aircraft: [N920AK](https://openairdocs.org/aircraft/N920AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44086
- Aircraft time: 18,084 hours, 5,310 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: D71702001
- Condition: Failed
- 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/ASAA2026081067916

## Discrepancy

AFT LEFT EMERGENCY LIGHT FAILED FUNCTIONAL CHECK. GROUNDED - YES. REPLACED M1673 BATTERY POWER SUPPLY REF BOEING AMM TASK 33-51-06-960-802. OP TEST GOOD WITH AFT LEFT EMERGENCY LIGHTS ILLUMINATING AS REQUIRED. NO FURTHER DEFECTS.

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