# SDR 2021F00178

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 28, 2021
- Submitted: June 29, 2021
- Operation: General aviation
- Aircraft: [N392QS](https://openairdocs.org/aircraft/N392QS), registered now
- Make and model: Emb EMB-505
- Registry model: [EMB EMB-505](https://openairdocs.org/model/embraer-executive-emb-505) (OpenAirDocs)
- Aircraft serial: 50500349
- Aircraft time: 4,373 hours, 3,433 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 6450LS00
- Part serial: 000881
- Condition: No Test
- Location: Emergency Lights
- Part time: 4,373 hours, 3,433 cycles
- 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/2021F00178

## Discrepancy

DURING SCHEDULED FUNCTIONAL CHECK, THE FORWARD EMERGENCY LIGHTS BATTERY FAILED FUNCTIONAL TEST. THE BATTERY ASSEMBLY WAS REPLACED WITH A NEW UNIT (P/N 7450LS-00) AND FUNCTIONAL TEST WAS PERFORMED WITH SATISFACTORY RESULTS.

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