Casualties unknown

1992-07-04: Bell 47G5 (N4798R) — Red Mountain Helicopters, Inc. — Mesa, AZ

Mesa, AZ, US

On July 4, 1992, a Bell 47G5 (registration N4798R) operated by Red Mountain Helicopters, Inc. was involved in an aviation accident near Mesa, AZ. Investigators recorded the probable cause as: A PARTIAL LOSS OF ENGINE POWER DUE TO UNKNOWN REASON (S). FACTORS IN THIS ACCIDENT WERE 1) LOW ALTITUDE WHEN THE PARTIAL LOSS OF POWER OCCURRED 2) LOW ROTOR RPM AS A RESULT OF THE LOSS OF POWER, AND 3) THE PILOT NOT BEING ABLE TO TAKE REMEDIAL ACTION DUE TO… 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 witness observed a helicopter carrying 60 gallons of insecticide take off, reach 50-60 feet, then experience a lateral tail rotor movement before landing hard. The pilot reported a power droop, but the cause was not determined.

Incident Description

A helicopter was performing a takeoff after being loaded with approximately 60 gallons of insecticide. According to a witness, the aircraft climbed to an altitude of about 50 to 60 feet above the ground. At that point, the witness observed the tail rotor move laterally about 4 to 5 feet. Subsequently, the helicopter began to settle and landed hard on the ground.

Witness Account

The witness, who was present during the operation, reported seeing the tail rotor shift sideways unexpectedly. He noted that the aircraft then descended and struck the ground with significant force. Immediately after the landing, the witness approached the pilot and inquired about the event.

Pilot Statement

The pilot reportedly told the witness that he had experienced a "power droop." This indicates a partial loss of engine power during the flight. The pilot did not provide further details regarding the nature of the power loss.

Investigation

The cause of the partial loss of power was not determined. Investigators were unable to identify a specific mechanical or operational factor that led to the power droop. No further information about the aircraft, occupants, or damage was available.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X15180. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.