No fatalities

31 May 2014: ROBINSON HELICOPTER R22 BETA BETA — KMB Helicopters LLC — San Manuel, AZ

San Manuel, AZ, United States

On 31 May 2014, a ROBINSON HELICOPTER R22 BETA BETA operated by KMB Helicopters LLC was involved in an aviation accident near San Manuel, AZ. No fatalities were reported. Investigators recorded the probable cause as: The pilot's failure to maintain an adequate obstacle clearance altitude from phone wires while performing low-level operations. This summary draws on records from NTSB; 12 related events involving the same aircraft type or operator are linked below.

SourcesNTSBPrimary reportUpdated 1778583330Data APIEditorial standards

While maneuvering to keep cattle together during a low-level herding operation, a helicopter's main rotor blades contacted a phone line. The wires entangled in the rotor head, causing the helicopter to descend from about 15 feet and impact the ground hard, resulting in substantial damage.

Accident Overview

A helicopter performing low-level aerial operations for cattle herding struck a phone line and sustained substantial damage. The pilot reported that the purpose of the flight was to herd cattle, and during the operation the helicopter descended from approximately 15 feet above ground level (AGL) after the main rotor blades became entangled in the line.

Sequence of Events

According to the pilot, the helicopter was maneuvering to keep the cattle close together. While focusing on the herd, the pilot did not notice a phone line in the flight path. The main rotor blades contacted the lines, which then became entangled in the main rotor head. The entanglement caused the helicopter to lose altitude and descend from roughly 15 feet AGL, impacting the terrain hard.

Damage

The hard impact collapsed the skids and resulted in substantial damage to both the tail rotor and main rotor blades. The helicopter's structural integrity was compromised in those areas.

Pilot Statement

The pilot reported no preimpact mechanical malfunctions or failures with the helicopter that would have precluded normal operation. The incident occurred solely due to the inadvertent contact with the phone line during the low-level maneuvering required for the cattle herding operation.

Contributing factors

Causes

Altitude — Not attained/maintainedPilot

Other contributing factors

Contributed to outcome