On August 23, 1991, a Piper PA-28-151 (registration N8479F) operated by Scott Afb Aero Club was involved in an aviation accident near Freeburg, IL. Investigators recorded the probable cause as: IMPROPER USE OF THE MIXTURE CONTROL BY THE PIC/CFI. A FACTOR RELATED TO THE ACCIDENT WAS INADEQUATE FRICTION ON THE MIXTURE CONTROL LEVER. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During a dual instructional flight practicing stalls, the propeller ceased turning. After an unsuccessful restart, an emergency landing on a rural road ended with a collision with a road sign. Investigation found no mechanical issues but a loose friction control lever.
Incident Overview
During a dual instructional flight, the flight instructor and student were practicing minimum controllable flight and stalls. While performing these maneuvers, the propeller stopped rotating. The mixture control was moved to the full rich position, but attempts to restart the engine were unsuccessful.
Emergency Landing
An emergency landing was attempted on a rural road. During the landing, the aircraft collided with a road sign.
Investigation Findings
Post-accident investigation revealed no mechanical engine malfunctions or fuel supply shortages. However, a loose friction control lever was found that failed to lock the quadrant levers in place.
Frequently asked questions
What happened in the 23 Aug 1991 Piper PA-28-151 accident near Freeburg, IL?
During a dual instructional flight practicing stalls, the propeller ceased turning. After an unsuccessful restart, an emergency landing on a rural road ended with a collision with a road sign. Investigation found no mechanical issues but a loose friction control lever.
What aircraft was involved and where did it happen?
The accident on 23 Aug 1991 involved a Piper PA-28-151, registration N8479F, operated by Scott Afb Aero Club, at Freeburg, IL.
What was the probable cause of the accident?
IMPROPER USE OF THE MIXTURE CONTROL BY THE PIC/CFI. A FACTOR RELATED TO THE ACCIDENT WAS INADEQUATE FRICTION ON THE MIXTURE CONTROL LEVER.
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