Casualties unknown

Turbulence and Downdraft on Final Approach Lead to Collision with Airport Boundary Fence (N5523P)

Hesperia, CA, US

On September 4, 1993, a Piper PA-24-250 (registration N5523P) was involved in an aviation accident near Hesperia, CA. Investigators recorded the probable cause as: THE AIRCRAFT'S ENCOUNTER WITH A LOW LEVEL WINDSHEAR AND THE PILOT'S INADEQUATE COMPENSATION FOR THE EXISTING WIND CONDITIONS. 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 2026-06-10Data APIEditorial standards

On approach to an airport surrounded by trees in a bowl-shaped depression, a pilot encountered turbulence and a downdraft. Despite full power, the aircraft descended into the boundary fence. Passengers reported turbulent air and possible low-level windshear from trees.

Accident Sequence

The pilot reported that while on short final approach to an airport located in a bowl-shaped depression and surrounded by trees on all sides, the aircraft encountered turbulence and a downdraft. Despite applying full power, the pilot was unable to arrest the descent, and the landing gear collided with the airport boundary fence.

Passenger Accounts

The aircraft owner, who was on board as a passenger, and a second passenger both stated that on final approach the air was very turbulent, especially when the aircraft descended below the tops of the trees surrounding the airport. The aircraft owner stated that he thought the aircraft encountered a low-level windshear caused by the trees.

Weather Conditions

The closest official weather reporting station, located 49 miles northwest of the airport, reported winds from 240 degrees at 18 knots, with gusts to 27 knots at the time of the accident.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X13419. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.