More detail on this person: NTSB Identification: LAX01LA304. The docket is stored in the Docket
Management System (DMS). Please contact Records Management Division
Accident occurred Saturday, September 22, 2001 in Chico, CA Probable Cause Approval Date:
6/8/2005
Aircraft: Aerospatiale AS350BA, registration: N911NT Injuries: 1 Fatal, 1 Serious, 1 Uninjured.
During a steep approach to a confined landing zone, the helicopter encountered a brown out condition
due to dust and dirt clouds formed by the rotor downwash, and the helicopter collided with trees
during an attempted go-around. After circling the landing area twice the pilot approached the
landing zone from the west to the east. Ground witnesses and the onboard flight nurses said the
approach was completely normal until the helicopter neared the ground. About 30 feet above the
ground there was a dirt/dust condition created from the helicopter's rotor blades and the witnesses
lost sight of the helicopter. One flight nurse, who was using night vision goggles to assist the
pilot with ensuring that the landing zone was clear, told investigators that as the dust cloud
formed their outside vision was completely obscured. The flight nurse asked the pilot if he could
see anything, but the pilot did not respond. The medical crew estimated that the pilot started to go
around about 15 feet above the ground, and during the go-around the helicopter drifted about 90 feet
to the south and impacted trees. Witnesses recalled hearing the engine power up and then heard the
helicopter impact trees. During the engine power up and go-around, no problems were heard with the
engine. The on board medical crew said that they did not perceive any mechanical difficulties with
the helicopter.
The National Transportation Safety Board determines the probable cause(s) of this accident as
follows: the pilot's inadequate in-flight decision and delay in initiating a go-around during an
encounter with brown out conditions, which led to his failure to maintain alignment of the
helicopter with the intended go-around flight path and a resulting collision with trees.
This information was last updated 05/18/2016
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Date posted on this site: 01/11/2025
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