What happened
On June 3, 1974, a Cessna 172 (registration D-EGQY) departed Samedan Airport for a VFR flight to Augsburg, Germany. The aircraft was carrying the pilot and three passengers. Shortly after takeoff, the aircraft climbed to an altitude of approximately 20 to 30 meters at the end of the runway and proceeded toward a wooded hill northeast of San Gian.
As the aircraft reached the area of Punt Muragl, the pilot initiated a tight left-hand turn to return toward the airport. During this maneuver, the aircraft struck a tree with its left wing, causing the plane to spin and strike additional trees. The aircraft then entered a near-vertical dive, impacting the ground in an inverted position. The impact and subsequent collision with trees resulted in two fatalities, including the pilot, and two serious injuries among the passengers. The aircraft was destroyed.
The investigation
Investigators examined the wreckage and flight records to determine the cause of the accident. The investigation established that the aircraft was approximately 21 kg over its maximum allowable weight. Technical examination of the engine revealed that the mixture was set to "full rich" rather than being leaned for the altitude, and the throttle was found in the full-power position at the time of impact.
Witnesses noted that the aircraft took a long time to become airborne and that the pilot appeared nervous during the takeoff roll. The investigation also reviewed the pilot's credentials, noting that while he held valid licenses, his experience was limited, particularly regarding mountain flying operations. No mechanical failures or pre-existing technical defects were found in the aircraft's controls or engine components.