# SDR QXEA2026110200235

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 1, 2026
- Submitted: November 3, 2026
- Operation: Air carrier
- Aircraft: [N639QX](https://openairdocs.org/aircraft/N639QX), registered now
- Make and model: Emb ERJ 170-200 LR
- Registry model: [EMB ERJ 170-200 LR](https://openairdocs.org/model/embraer-s-a-erj-170-200-lr) (OpenAirDocs)
- Aircraft serial: 17000760
- Aircraft time: 20,801 hours, 15,027 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 330131
- Condition: Faulted
- Location: Zone 200
- 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/QXEA2026110200235

## Discrepancy

DURING PREFLIGHT FOUND FORWARD HALF OF AIRCRAFT EMERGENCY LIGHTS TO NOT WORK, INCLUDING IN THE FLIGHTDECK. ALSO GOT EMER LT BATT FAULT EICAS MESSAGE WHEN EMERGENCY LIGHT SWITCH IS ON. REMOVED FROM SERVICE. INTERROGATED CMC AND FOUND FAULT 33500001UT1: C/W FIM 33-50-00-810-801-A STEPS 1-8C . REMOVED ELPU FWD RT PER AMM 33-50-01, 2 MIGSIA INSTALLED. REPLACED FWD RIGHT ELPU REF AMM 33-50-01-400-801-A. REPLACED FWD RIGHT ELPU BATTERY REF AMM 33-50-01-400-802-A. OPS TEST GOOD. EMER LT BATT FAULT EICAS MESSAGE NO LONGER ACTIVE. RETURNED TO SERVICE.

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