# SDR SWAA2026061611404

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2026
- Submitted: June 17, 2026
- Operation: Air carrier
- Aircraft: [N8549Z](https://openairdocs.org/aircraft/N8549Z), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 63597
- Aircraft time: 28,686 hours, 14,528 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- 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/SWAA2026061611404

## Discrepancy

EMERGENCY EXIT LIGHTS ASSOCIATED WITH M2816 DO NOT ILLUMINATE.   FOUND ACTUAL MALFUNCTION AFFECTING EMERGENCY LIGHTS ATTACHED TO M1675 POWER SUPPLY IAW WDM 33-51-12. TROUBLESHOT TO FAULTY M1675 POWER SUPPLY CONSTANTLY DISCHARGING BATTERY. REPLACED M1675 POWER SUPPLY & M1675 BATTERY & TESTED IAW AMM 33-51-06-960-805 & 33-51-06-960-806. INSTALLATION TESTING PASSESFOR BOTH PARTS REPLACED.

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