Mcdonnell Douglas Helicopter 369E N911PH accident near St. Louis, Missouri

Probable cause

The pilot’s failure to apply power during the recovery procedure for the practice autorotation, which resulted in a hard landing.

NTSB analysis

The pilot reported that he intended to perform a straight-in autorotation that would terminate with a power on recovery procedure over the runway. The autorotation was performed without incident; however, the pilot did not advance the engine power in time for the recovery. The helicopter impacted the runway hard and came to rest upright on the skids. During the impact sequence, the main rotor blades contacted and severed the tail boom, which resulted in substantial damage. The pilot reported there were no preimpact mechanical malfunctions or failures with the airframe and engine that would have precluded normal operations.

Text from the NTSB. Open the NTSB docket for CEN22LA063 for the full record.