On July 12, 1990, a Cessna P210R (registration N6203A) operated by Great Western Aviation, Inc was involved in an aviation accident near Ogden, UT. Investigators recorded the probable cause as: FAILURE OF THE #1 PISTON DUE TO PRE-IGNITION/DETONATION IN THE #1 CYLINDER, AND INADEQUATE VISUAL LOOKOUT BY THE PILOT (HIS FAILURE TO SEE-AND-AVOID THE OBSTRUCTION). THE OBSTRUCTION (POWER LINE) WAS A RELATED FACTOR. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A flight with two pilots and two revenue passengers experienced a loss of engine power. The pilot turned 180 degrees and glided down a canyon before striking an unmarked power line approximately 100 to 200 feet above ground level.
The Flight
A flight departed with two pilots and two revenue passengers. The left-seat pilot was at the controls at the time of the incident.
Engine Power Loss
During the flight, a loss of engine power occurred. The pilot initiated a 180-degree turn and began gliding down a canyon.
Canyon Glide and Obstacle Strike
While gliding through the canyon, the aircraft struck an unmarked power line located at the mouth of the canyon. The impact occurred approximately 100 to 200 feet above ground level.
Post-Accident Examination
A post-accident examination of the engine revealed evidence of detonation and preignition, as well as excessive heating in the number one cylinder. This was followed by a failure of the number one piston.
Frequently asked questions
What happened in the 12 Jul 1990 Cessna P210R accident near Ogden, UT?
A flight with two pilots and two revenue passengers experienced a loss of engine power. The pilot turned 180 degrees and glided down a canyon before striking an unmarked power line approximately 100 to 200 feet above ground level.
What aircraft was involved and where did it happen?
The accident on 12 Jul 1990 involved a Cessna P210R, registration N6203A, operated by Great Western Aviation, Inc, at Ogden, UT.
What was the probable cause of the accident?
FAILURE OF THE #1 PISTON DUE TO PRE-IGNITION/DETONATION IN THE #1 CYLINDER, AND INADEQUATE VISUAL LOOKOUT BY THE PILOT (HIS FAILURE TO SEE-AND-AVOID THE OBSTRUCTION). THE OBSTRUCTION (POWER LINE) WAS A RELATED FACTOR.
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