Transport Canada CF-2023-55

Requires the inspection of the wire bundle near the fuel scupper attachment bolt and any necessary repair. During airplane refueling, a spark was seen when the fuel cap chain contacted one of the fuel scupper bolts. An inspection was performed and one of the 14 bolts that surround the fuel inlet was found touching an electrical wire behind the scupper. Due to vibrations during flight, the bolt damaged the wire insulation and when the bolt was grounded to the airframe a spark was generated. This condition, if not corrected, could lead to electrical sparks during refueling, resulting in a fire hazard.