# SDR CALA2026083119060

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 2026
- Submitted: August 31, 2026
- Operation: Air carrier
- Aircraft: [N37506](https://openairdocs.org/aircraft/N37506), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43432
- Aircraft time: 21,187 hours, 7,089 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702030
- Condition: Faulted
- 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/CALA2026083119060

## Discrepancy

EMERGENCY LIGHTS AT ROWS 8-14, MID LAV EMERGENCY LIGHTS, ROW 2 CEILING AND LEFT FWD EXTERIOR OVERWING EMERGENCY LIGHTS COME ON AND OFF WITH EMERGENCY LITE SWITCHES OFF. OCCURRED 3 TIMES AND HAS HISTORY. T/S IAW FIM 33-51 T 815, WDM 33-51-12-4,  FOUND POWER SUPPLY M2503 INTERMITTENT TEST BUTTON MISSING WITH  CONNECTOR NOT LOCKED. REPLACED POWER SUPPLY M2503 IAW AMM 33-51-06-960-803. TESTED PER SAME, OPS TEST GOOD.

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