Casualties unknown

2005-12-19: Robinson R22 BETA (N177LH) — Irwindale, CA

Irwindale, CA, US

On December 19, 2005, a Robinson R22 BETA (registration N177LH) was involved in an aviation accident near Irwindale, CA. Investigators recorded the probable cause as: The pilot failed to maintain adequate main rotor rpm. 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

A helicopter entered an uncontrolled descent during a left downwind turn after takeoff, colliding with the ground. The pilot reported climbing too fast without forward airspeed while avoiding trees, and heard a low rotor rpm warning before attempting an autorotation.

Synopsis

A helicopter sustained damage after entering an uncontrolled descent and impacting the ground during a practice flight. The pilot was performing landing and approach maneuvers in an area designated for safe practice. The accident occurred following a takeoff and a subsequent left downwind turn.

Flight Details

According to the pilot, the flight involved practicing landings, climbs, descents, and approaches over a suitable landing area. After landing, the pilot took off and executed a left downwind turn. During the turn, the pilot was attempting to avoid nearby trees.

Pilot Report

The pilot stated that while maneuvering to avoid trees, he climbed too rapidly without sufficient forward airspeed. This condition led to an uncontrolled descent. During the descent, the pilot heard the low main rotor rpm warning horn. He attempted to enter an autorotation but was too close to the ground to complete the maneuver. The helicopter subsequently collided with the terrain.

Accident Sequence

The sequence began with a takeoff from the practice area, followed by a left downwind turn. The loss of control occurred as the helicopter climbed steeply with little forward motion. The uncontrolled descent continued until impact, with the rotor rpm warning sounding during the descent. The pilot’s attempt to recover via autorotation was unsuccessful due to insufficient altitude.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20060114X00081. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.