On August 23, 1987, a Gulfstream American AA-5A (registration N26250) operated by Opengart, Arnold was involved in an aviation accident near Tucson, AZ. Investigators recorded the probable cause as: The failure of a rocker arm on cylinder number four due to high cycle fatigue. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot experienced partial engine power loss shortly after takeoff, forcing an emergency landing that resulted in a collision with utility infrastructure due to a failed rocker arm.
What happened
The pilot reported that the aircraft lost partial power shortly after takeoff. Unable to return to the departure airport, the pilot initiated an emergency landing procedure. During this maneuver, the aircraft collided with a utility line and pole.
The investigation
A physical examination of the engine revealed that a rocker arm on cylinder number four had failed. A metallurgical analysis of the failed component confirmed that the failure was caused by high cycle fatigue.
Findings
The mechanical failure of the rocker arm led to the loss of power, which necessitated the emergency landing and subsequent collision with ground infrastructure.
Probable cause
The failure of a rocker arm on cylinder number four due to high cycle fatigue.
What happened in the 23 Aug 1987 Gulfstream American AA-5A accident near Tucson, AZ?
A pilot experienced partial engine power loss shortly after takeoff, forcing an emergency landing that resulted in a collision with utility infrastructure due to a failed rocker arm.
What aircraft was involved and where did it happen?
The accident on 23 Aug 1987 involved a Gulfstream American AA-5A, registration N26250, operated by Opengart, Arnold, at Tucson, AZ.
What was the probable cause of the accident?
The failure of a rocker arm on cylinder number four due to high cycle fatigue.
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