1968 Piper Cherokee PA-28-140 accident at Gotthard Pass (HB-OYE)

Accident overview and aircraft details On 23 July 1968, a Piper Cherokee PA-28-140 with registration HB-OYE was destroyed in a collision with terrain near the Gotthard Pass in Switzerland. The aircraft, manufactured by Piper Aircraft Corp. in 1965, was operated by the Motorfluggruppe of the Zurich section of the Aero-Club of Switzerland. It was powered by a Lycoming O-320-E2A engine and equipped with a Sensenich M74-DM-O-58 propeller. The aircraft was a single-engine, low-wing, three-seat metal construction with fixed nose gear. ## Flight operations and weather conditions The pilot, a private pilot licensed in 1965, departed Zurich-Kloten at 0755 local time for Lugano-Agno. Prior to departure, the pilot was advised by airport personnel that weather conditions at the Gotthard were unfavorable and likely to deteriorate. The flight plan indicated a route via the Reuss Valley, Gotthard, and Ceneri. ## Accident sequence During the flight, the pilot made several position reports to air traffic control, climbing to flight level 120 over Erstfeld. Around 0900, multiple witnesses observed the aircraft flying at low altitude in dense fog over the Gotthard Pass. The aircraft subsequently struck the ground west of the pass and caught fire. The pilot was killed instantly, and the aircraft was destroyed. ## Investigation findings The investigation determined that the accident occurred because the pilot continued the flight in weather conditions unsuitable for visual flight, lost orientation, and collided with terrain. The aircraft's vacuum-powered instruments were inoperative at the time of the accident due to a pump failure, and were marked as such. No third-party damage occurred on the ground.