Casualties unknown

1990-01-17: Bell 47-G2 (N90836) — Townsend, John R. — Lafayette, IN

Lafayette, IN, US

On January 17, 1990, a Bell 47-G2 (registration N90836) operated by Townsend, John R. was involved in an aviation accident near Lafayette, IN. Investigators recorded the probable cause as: THE HELICOPTER STUDENT'S IPROPER USE OF THE COLLECTIVE PITCH LEVER DURING THE LANDING PHASE OF FLIGHT. THE PILOT'S LACK OF TOTAL EXPEREINCE, THE RELATIVELY HIGH WIND, AND INADVERTENT LIFTOFF OF THE HELICOPTER WERE FACTORS RELATED TO THE ACCIDENT. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards
Aircraft registered N90836
Aircraft registered N90836. Photo: Unknown author Unknown author / Public domain, via Wikimedia Commons

During his first solo helicopter landing, a private pilot rated student with 15 hours rotorcraft experience reported over-controlling after a tail strike, resulting in a 360-degree rotation and the helicopter coming to rest on its side.

Incident Summary

A private pilot rated helicopter student was performing the first landing of his first solo helicopter flight while his instructor observed from the ground. The student reported landing into 15-knot winds and stated that the aircraft was set down slowly, but he did not place the collective firmly on the floor. The aircraft was light on the skids, rotated left, and an over-control resulted in a tail strike, followed by a loss of anti-torque control. The helicopter then rotated 360 degrees before the main rotor blades struck the ground, and the helicopter came to a rest on its side.

Pilot Background

The pilot's logbook records indicated a total flight time of 3,693 hours, which included 15 hours of rotorcraft experience. All 15 hours of rotorcraft flight time were acquired in the accident aircraft within the 30 days preceding the accident.

Sequence of Events

According to the student pilot, the landing sequence began with a slow touchdown into a 15-knot wind. However, the collective was not fully lowered, leaving the skids lightly in contact with the ground. The helicopter then began a left rotation. The pilot’s attempt to correct led to an over-control, resulting in a tail strike. Following the tail strike, anti-torque control was lost, and the helicopter entered an uncontrolled 360-degree rotation. The main rotor blades subsequently struck the ground, causing the helicopter to roll onto its side.

Outcome

The helicopter came to rest on its side after the main rotor blades struck the ground. The pilot’s account was the primary source of information regarding the sequence of events.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22394. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.