Helicopter Rolls Over After Landing Platform Collapses

Accident Narrative

The pilot of a helicopter reported that, during landing on a home-built landing platform (dolly), the helicopter landed normally and was stable. After reducing engine power, the pilot began to wait the prescribed engine cool-down period before shutting down the engine. Approximately 60 seconds prior to complete shutdown, the platform collapsed. The helicopter subsequently rolled aft and to the right, coming to rest on its right side.

Examination

Postaccident examination of the platform revealed that the home-built landing platform had sustained a structural failure and collapsed. The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.

Damage

The helicopter sustained substantial damage to the tailboom.