# SDR CALA2026020213473

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2026
- Submitted: February 2, 2026
- Operation: Air carrier
- Aircraft: [N77261](https://openairdocs.org/aircraft/N77261), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31582
- Aircraft time: 77,181 hours, 26,979 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702001
- Condition: Inoperative
- Location: Zone 200
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026020213473

## Discrepancy

EXTERIOR EMERGENCY LIGHT INOP AT RH AFT OVERWING EXIT DOOR RELAMPED, NO HELP. FOUND NO VOLTAGE TO LIGHT ASSY. CHECKED RESISTANCE FROM CONNECTOR 12004 PIN 12 TO  CONNECTOR 12018 PIN 1 REF WDM 33-51-14. CHECKS OK. REMOVED AND REPLACED BATTERY POWER SUPPLY AT 27DEF (M1671) IAW AMM 33-51-06. OPS CHECK NORMAL.

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