Primary finding
Probable cause
The pilot’s inadequate preflight inspection, which resulted in an attempted departure with the flight control lock device installed, and subsequent nose landing gear collapse.
Investigator assessment
Analysis narrative
The pilot reported that shortly after liftoff, the airplane pitched down unexpectedly and bounced on the runway. The pilot realized the control lock device was still installed but was unable to remove it before the aircraft impacted the runway firmly enough to collapse the nose gear. The pilot reported that due to the installation of new avionics, he modified the original flight control lock device, and it no longer covered the ignition switch. During the preflight inspection, he failed to remove the modified flight control lock. The airplane sustained substantial damage to the forward fuselage and left wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.