# SDR 2026FA0000243

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2026
- Submitted: March 31, 2026
- Operation: General aviation
- Aircraft: [N331AB](https://openairdocs.org/aircraft/N331AB), registered now
- Make and model: Gulstm GVI
- Aircraft serial: 6487
- Aircraft time: 2,285 hours, 976 cycles
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Wire Harness
- Part number: WO1332A204
- Condition: Exposed
- Location: Zone 900
- Part time: 2,285 hours, 976 cycles
- 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/2026FA0000243

## Discrepancy

AIRCRAFT REPORTED SSPC 3327 - SIGN LIGHTS TRIPS INTERMITTENTLY AND HE SUSPECTED THE DEFECT TO BE BETWEEN THE LT AFT PSU AND AFT LAV LT PSU. CONTINUITY CHECKS WERE CARRIED OUT BETWEEN TB 931TJ3S AND CONNECTOR 794A1P1, INCLUDING LINE TO LINE AND CHECKS TO GROUND, NO DEFECTS APPARENT.  INSPECTION OF WIRING LOOMS FOUND THE BACK SHELL ON 780DB13J2A LOOSE. 780DB13J2A AND ATTACHED WIRING ALSO INSPECTED FOR DAMAGE, SIGNS OF ARCHING EVIDENT BELOW CABLE TIE APPROXIMATELY 7” FROM CONNECTOR. ON INSPECTION WIRE IDENT W01331A20-4 CORE EXPOSED. W01332A20-4, WO1333A20-4 AND PX7981A12-4 OUTER INSULATION FOUND DAMAGED.

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