Casualties unknown

1963 Pilatus Turbo-Porter PC-6A Accident at Ayent, Switzerland (HB-FAD)

Ayent, VS, CH

On June 26, 1963, a PILATUS FLUGZEUGWERKE AG PC-6/A (registration HB-FAD) was involved in an aviation accident near Ayent, VS, CH. Investigators recorded the probable cause as: The malfunction in the propeller control system was very likely due to the mechanical jamming of a specific design component. This summary draws on records from the Swiss Transportation Safety Investigation Board (STSB / SUST).

Sourcesthe Swiss Transportation Safety Investigation Board (STSB / SUST)Primary reportUpdated 2026-09-13Data APIEditorial standards

On June 26, 1963, a Pilatus Turbo-Porter PC-6A (HB-FAD) made an emergency landing near Ayent, Switzerland, after a propeller control malfunction during a low-altitude filming flight. The aircraft was heavily damaged, but all occupants were uninjured.

Incident Overview and Flight Details On June 26, 1963, at 15:30 MEZ, a pilot departed from Sitten airfield in a Pilatus Turbo-Porter PC-6A, registration HB-FAD, carrying three passengers. The flight was conducted under the operations of the Valais section of the Ae.C.S. and was intended for aerial filming over the Crans golf course. The aircraft, a single-engine, braced high-wing monoplane with a fixed tailwheel, was manufactured in 1961 and powered by an Astazou II-E turboprop engine driving a Ratier-Figeac three-blade metal propeller. The total flight time of the aircraft at the time of the accident was 334:03 hours, and its weight was approximately 1,700 kg, within the maximum allowable limit of 1,960 kg. The center of gravity remained within prescribed limits throughout the flight.

Probable cause

The malfunction in the propeller control system was very likely due to the mechanical jamming of a specific design component.

Investigation report by the Swiss Transportation Safety Investigation Board (STSB / SUST). Original record: https://www.sust.admin.ch/inhalte/AV-berichte/136.pdf. This page is a structured re-presentation; facts and quotes are in the Swiss Transportation Safety Investigation Board (STSB), Switzerland.