Aircraft Crash in Box Canyon

Casualties unknown • Grantsville, UT, US

A local flight ended in a crash and fire on the steep terrain of a box canyon after the aircraft failed to return as scheduled.

What happened

At 1801 MDT, the pilot and passenger departed on a local flight. When the aircraft failed to return to its origin, a search operation was initiated. The next morning, the wreckage was located in a box canyon, having crashed and burned on the west side of the canyon. The entrance to the canyon is situated to the southeast.

The investigation

The aircraft impacted the terrain on a southerly heading. Investigators identified impact marks, consisting of fragmented and gouged rocks, approximately 50 feet upslope from the final resting position of the main wreckage. Much of the debris was destroyed by fire.

An examination of the right wing revealed chordwise crushing of its lower skin. Both propeller blades were found to be bent and twisted, with the tips of both blades torn off. The investigation found no preimpact mechanical part failure or malfunction. At the time of the crash, the density altitude at the site was approximately 7000 feet.

Frequently asked questions

What happened in the 1989-09-07 Piper PA-24-180 accident near Grantsville, UT?

A local flight ended in a crash and fire on the steep terrain of a box canyon after the aircraft failed to return as scheduled.

What aircraft was involved and where did it happen?

The accident on 1989-09-07 involved a Piper PA-24-180, registration N7835P, operated by Calvin, Joe B., at Grantsville, UT.

What was the probable cause of the accident?

IMPROPER IN-FLIGHT PLANNING/DECISION BY THE PILOT, BY ENTERING A BOX CANYON WITH INSUFFICIENT ALTITUDE TO ASSURE A SAFE EXIT. CONTRIBUTING FACTORS WERE: BOX CANYON, RISING TERRAIN, AND HIGH DENSITY ALTITUDE.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X29339. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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