# SDR DXTA2025121106042

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2025
- Submitted: December 11, 2025
- Operation: Air carrier
- Aircraft: [N462QS](https://openairdocs.org/aircraft/N462QS), registered now
- Make and model: Emb EMB-505
- Registry model: [EMB EMB-505](https://openairdocs.org/model/embraer-executive-emb-505) (OpenAirDocs)
- Aircraft serial: 50500719
- Aircraft time: 2,397 hours, 1,968 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: 7450LS00
- Part serial: 005547
- Condition: Failed
- Location: Zone 200
- Part time: 900 hours, 738 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2025121106042

## Discrepancy

WHEN GPU WAS DISCONNECTED AFTER ENGINE START, THE EMER LT NOT ARM CAS ILLUMINATED WITH THE SWITCH IN THE ARM POSITION.   ALL EMERGENCY LIGHTS ILLUMINATED IN CABIN. PERFORMED A GROUND RESET & THE CAS CAME BACK ON DURING ENGINE START WITH BATTERY POWER.  CONFIRMED ALL EMERGENCY LIGHTS ILLUMINATED IN CABIN WHEN THE EMERGENCY LIGHTS SWITCH IN ARM POSITION. PERFORMED A UNSATISFACTORY OPS CHECK. NOTIFIED MCC. CUSTOMER ELECTED TO REPLACE BOTH EMERGENCY LIGHTING BATTERIES. REMOVED AND REPLACED BATTERIES 182. PERFORMED A SATISFACTORY OPS CHECK OF THE EMERGENCY RIGHTING SYSTEM WITH NO FAULTS OR DEFECTS NOTED. WORK PERFORMED IAW MM 33-52-01.

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