# SDR CALA2026081318576

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 11, 2026
- Submitted: August 13, 2026
- Operation: Air carrier
- Aircraft: [N27267](https://openairdocs.org/aircraft/N27267), registered now
- Make and model: Boeing 737-8
- Registry model: [Boeing 737-8](https://openairdocs.org/model/boeing-737-8) (OpenAirDocs)
- Aircraft serial: 67522
- Aircraft time: 14,248 hours, 4,806 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702001
- Condition: Faulted
- Location: Zone 200
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026081318576

## Discrepancy

FIRST CLASS EMERGENCY ESCAPE PATH LIGHTING & LT OVERWING ESCAPE LIGHT BY FLAP INOPERATIE.  R & R FUSES IN M1676,  NO FIX IAW WDM 33-51-12, & FIM 33-51 TASK 815,   OUTER  LT EMERGENCY LIGHT WAS RELAMPED & WORKS. INSTALLED SERVICEABLE EMERGENCY LIGHT M1626 IAW RECOMMENDATION & EIGHT FIRST CLASS EMERGENCY EXIT LIGHTS WILL NOT ILLUMINATE WHEN SWITCH SELECTED TO EMERGENCY LIGHTS.  REINSTALLED ORIGINAL BATTERY CHARGER AND BATTERY.  DURING TROUBLE SHOOTING, FOUND CHARGER AND BATTERY M2816 IS BLOWING FUSE & THERE IS A SHORT IN WIRING HARNESS IN THOSE FIRST CLASS SEATS.  FOUND NO VOLTAGE GETTING TO SIDEWALL DISCONNECT D12052, INSPECTED M2816 FUSES AND FOUND 1 BLOWN, SWAPPED WITH KNOWN GOOD FUSE NO FIX,.  FUSE BLEW AGAIN.. DISCONNECTED SEAT ROWS 1-4  LT SIDE HARNESS TO ISOLATE WIRING, BEGAN DISCONNECTING LIGHT ASSEMBLIES FROM WIRING HARNESS. IAW WDM 33-51-21-6 VERIFIED LT SEAT ROWS 1AB - 4AB.  EMERGENCY WIRING HAD NO SHORTS WITH ALL 8 FLOOR PROX LIGHTS & SHIPSIDE CONNECTOR D12052P DEMATED. APPLIED A HARNESS SHAKE FOR INTERMITTENT SHORT. WIRING CHECKED OK WITH STEADY OL .  R & R FUSES, R & R FWD EMERGENCY LIGHT POWER SUPPLY IAW AMM 33-51-06-960-803, OPS CHKD GOOD.

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