Engine oil was observed dripping out of the port side wing root. The ¼-inch aluminum oil pressure line (p/n 5600107-11) was routed over the top of a section of three-inch SCAT tubing. The SCAT tubing’s wire chafed a hole in oil pressure line. This airplane’s starboard line also was routed the same way and was rerouted to prevent chafing.
Aircraft components exhibited physical degradation, including a cracked flap nose rib, a cracked rudder bar support, and a chafed oil pressure tube.
Engine and fuel system issues included foreign object debris (FOD) contaminating an oil pump and a detached carburetor discharge tube that impaired throttle control.
Incidents highlighted critical maintenance oversights, such as improper routing, non-compliance with service bulletins, and potential design flaws regarding load distribution.
During an annual inspection, a nose rib was found cracked in the right flap. It is the rib located directly beneath the attach bracket mounted on the skin (r/h flap p/n: 35-165050-79; nose rib p/n: 35-165050-84. Part Total Time: 4069.2 hours
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