# SDR CALA2026012713345

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 25, 2026
- Submitted: January 27, 2026
- Operation: Air carrier
- Aircraft: [N39726](https://openairdocs.org/aircraft/N39726), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28796
- Aircraft time: 77,214 hours, 27,302 cycles
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Wire
- Condition: Open
- 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/CALA2026012713345

## Discrepancy

EMERGENCY LIGHTS OPERATIONAL CHECK - RIGHT CENTER OVERWING EXIT EXTERIOR EMERGENCY LIGHTS DID NOT ILLUMINATE DURING CHECK.REQUESTING MEL REF 3314A FOR EXTERIOR R CTR O/W EMERGENCY EXIT LIGHT RELAMPED REF AMM 33-51-04-960-801. NO FIX.  CHECKED FUSES ON POWER SUPPLY M1669, FOUND ALL FUSES GOOD. MEASURED RESISTANCE  BETWEEN M1669 PWR SUPPLY  CONNECTOR D10714 PIN 11, RT OVERWING EXTERIOR ESCAPE LIGHT AND PIN 7 WHICH IS ACFT GND ON CONNECTOR D10714, RESISTANCE SHOWS OPEN. THEN MEASURED RESISTANCE BETWEEN PIN 7 AND PINS 14,15,16 TO VERIFY, 14,15,16 TO 7 ALL SHOW LESS THAN 2 OHMS. THESE ARE OTHER LIGHT ASSY. SUSPECT FAULT BETWEEN D10714 PIN 11 AND RIGHT OVER WING ESCAPE LIGHT L7. UPON ATTEMPTING TO REMOVE THE RIGHT OVER-WING EMERGENCY LIGHT ASSEMBLY, IT WAS DISCOVERED THAT THE ASSEMBLY IS ATTACHED WITH HI-LOKS . REPLACED THE ASSEMBLY.

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