Skid Damage During Helicopter Autorotation Practice

Casualties unknown • Council Bluffs, IA, US

A student pilot experienced a skid fracture during a practice hover to autorotation maneuver when improper control inputs led to an unbalanced landing.

What happened

During a training session, a student pilot was performing the third practice hover to autorotation maneuver. When the aircraft was approximately three feet above ground level (agl), the student applied right rudder pedal and increased collective input in an attempt to cushion the impact at one foot agl.

The helicopter landed on its left skid first, followed by the right skid. This landing sequence caused the left front section of the skid to break at the junction to the undercarriage. There were no injuries reported following the event.

The investigation

An examination of the left skid was conducted following the breakage. The inspection revealed an overload fracture that originated from the outboard side and moved towards the inboard section of the left skid.

Probable cause

The student pilot's application of right rudder and increased collective input during the maneuver resulted in an unbalanced landing on the left skid, causing an overload fracture.

Frequently asked questions

What happened in the 1997-04-27 Hughes 269A accident near Council Bluffs, IA?

A student pilot experienced a skid fracture during a practice hover to autorotation maneuver when improper control inputs led to an unbalanced landing.

What aircraft was involved and where did it happen?

The accident on 1997-04-27 involved a Hughes 269A, registration N1040S, at Council Bluffs, IA.

What was the probable cause of the accident?

The student pilot's application of right rudder and increased collective input during the maneuver resulted in an unbalanced landing on the left skid, causing an overload fracture.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001208X07694. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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