Incident Overview
An instructional training flight involving two airline transport pilots ended with a landing gear collapse during touch-and-go landings on Runway 17. The aircraft, a light twin-engine airplane, was conducting the maneuver when, immediately after touchdown, the right main landing gear collapsed.
Pilot Actions
The flight instructor reported that after touchdown, the "right side slowly lowered." The pilot receiving instruction, who was on the controls, announced "something is wrong." Both pilots then applied full left aileron and left brake to counter the right yaw. Despite their efforts, the aircraft departed the runway on the right side, traveling onto grass and across a shallow ditch before coming to a stop.
Aircraft Damage
The aircraft came to rest with the right main landing gear collapsed, while the nose and left main landing gear remained down and locked. Structural damage was sustained to the right wing and right horizontal stabilizer. Both pilots egressed unassisted and reported no injuries.
Post-Accident Inspection
A Federal Aviation Administration inspector conducted a post-accident examination, which revealed that the right landing gear over-center down link lock had failed on touchdown.
Weather Conditions
At the time of the accident, weather conditions included wind from 100 degrees at 9 knots, overcast skies at 2,000 feet, visibility of 10 miles, and a barometric pressure setting of 29.70 inches of Mercury.
Runway Information
The runway was asphalt, measuring 7,000 feet in length and 100 feet in width.