# SDR ASAA2026051966200

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 19, 2026
- Submitted: May 21, 2026
- Operation: Air carrier
- Aircraft: [N535AS](https://openairdocs.org/aircraft/N535AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35200
- Aircraft time: 53,939 hours, 16,070 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71701100
- Condition: Inoperative
- Location: Zone 200
- 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/ASAA2026051966200

## Discrepancy

L1 DOOR, INTERIOR/EXTERIOR EMERGENCY LIGHT INOP. GROUNDED - YES. PERFORMED EMERGENCY LIGHTING T/S TO ISOLATE THE FAULT IAW B737 FIM 33-50 TASK 801. FOUND SUPPLY BATTERY PACK (M01675)LH INOPERATIVE, REMOVED AND REPLACED BATTERY PACK (M01675)LH IAW B737 AMM 33-51-06-960-805 AND PERFORMED TEST OF THE BATTERY PACK IAW B737 AMM 33-51-06-960-805 OPS TEST 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.