Casualties unknown

1971 Standard-Cirrus Glider Accident at Montagne de Boudry (HB-987)

Montagne de Boudry, NE, CH

On April 18, 1971, a SCHEMPP-HIRTH KG STANDARD CIRRUS (registration HB-987) was involved in an aviation accident near Montagne de Boudry, NE, CH. Investigators recorded the probable cause as: The accident was due to a loss of speed of the glider in a turn, in a turbulent zone near the slope, at an insufficient height to re-establish a normal flight attitude. This summary draws on records from the Swiss Transportation Safety Investigation Board (STSB / SUST).

Sourcesthe Swiss Transportation Safety Investigation Board (STSB / SUST)Primary reportUpdated 2026-10-18Data APIEditorial standards

On April 18, 1971, a Standard-Cirrus glider (HB-987) crashed into trees on the south slope of Montagne de Boudry after the pilot lost control in turbulent air. The pilot was seriously injured.

Incident Overview and Aircraft Details On April 18, 1971, a Standard-Cirrus glider with registration HB-987 crashed into a forest on the south slope of the Montagne de Boudry in the commune of Gorgier. The aircraft, a single-seat performance glider manufactured by Schempp-Hirth KG, was operated by the Groupement de vol à voile, Section vaudoise de l’AéroClub de Suisse, Lausanne. The glider had been imported new on March 6, 1971, and had accumulated 40 hours and 17 minutes of flight time with 32 landings at the time of the accident. The total weight of 299 kg and the center of gravity were within prescribed limits. The pilot, an Austrian national born in 1934, held a valid glider pilot license and had a total experience of 238 hours and 18 minutes. No prior accidents or regulatory infractions were recorded in his file, and his last medical examination on February 4, 1971, found him fit to fly.

Probable cause

The accident was due to a loss of speed of the glider in a turn, in a turbulent zone near the slope, at an insufficient height to re-establish a normal flight attitude.

Frequently asked questions

What happened in the 18 Apr 1971 SCHEMPP-HIRTH KG STANDARD CIRRUS accident near Montagne de Boudry, NE, CH?

On April 18, 1971, a Standard-Cirrus glider (HB-987) crashed into trees on the south slope of Montagne de Boudry after the pilot lost control in turbulent air. The pilot was seriously injured.

What aircraft was involved and where did it happen?

The accident on 18 Apr 1971 involved a SCHEMPP-HIRTH KG STANDARD CIRRUS, registration HB-987, at Montagne de Boudry, NE, CH.

What was the probable cause of the accident?

The accident was due to a loss of speed of the glider in a turn, in a turbulent zone near the slope, at an insufficient height to re-establish a normal flight attitude.

Investigation report by the Swiss Transportation Safety Investigation Board (STSB / SUST). Original record: https://www.sust.admin.ch/inhalte/AV-berichte/607.pdf. This page is a structured re-presentation; facts and quotes are in the Swiss Transportation Safety Investigation Board (STSB), Switzerland.