# SDR DXTA2022112174310

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 21, 2022
- Submitted: November 21, 2022
- Operation: Air carrier
- Aircraft: [N420QS](https://openairdocs.org/aircraft/N420QS), registered now
- Make and model: Emb EMB-505
- Registry model: [EMB EMB-505](https://openairdocs.org/model/embraer-executive-emb-505) (OpenAirDocs)
- Aircraft serial: 50500462
- Aircraft time: 3,969 hours, 3,170 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 7450LS00
- Part serial: 005776
- Condition: Inoperative
- Location: Emergency Lights
- Stage of operation: TX
- How discovered: C
- Nature of condition: L
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2022112174310

## Discrepancy

CABIN EMERGENCY LIGHTS REMAIN ILLUMINATED WITH SWITCH IN ARM POSITION.  WHILE ON BATTEY POWER & DURING ENG STARTS,  EMERGENCY LIGHT NOT ARM CASS MESSAGE DISPLAYED WITH SWITCH IS IN ARM POSITION.  WITH A GPU OR GENERATOR ONLINE CASS MESSAGE WILL EXTINGISH BUT CABIN LIGHTS REMAIN ON.  REPLACED  BATTERY IAW MM 33·52-01.  OP CHECKED GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.