Incident Overview
An airline transport pilot reported that the airplane's left main landing gear assembly collapsed while taxiing from the ramp to the active runway. The incident occurred before takeoff, and no further details regarding injuries or damage were provided in the source.
Postaccident Examination
A postaccident examination of the landing gear assembly showed that the roll pin (part number NAS 561P4), which retains the attaching shaft (part number 0841011-1) to the trunnion assembly, was fractured. This failure allowed the landing gear attaching shaft to shift from its installed position, resulting in the trunnion assembly separating from the landing gear support structure.
Operator Fleet Check
Following the inspection of the failed landing gear, the operator examined the landing gear of its remaining Cessna 402 aircraft, totaling six additional airplanes. During these inspections, the operator identified two aircraft with broken landing gear shaft roll pins. The affected roll pins were replaced, and the operator reported that the landing gear assemblies would be reexamined at six-month intervals moving forward.