A New Way of Flight Training⦠- American Bonanza Society
A New Way of Flight Training⦠- American Bonanza Society
A New Way of Flight Training⦠- American Bonanza Society
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www.bonanza.org<br />
Safety Pilot By Thomas P. Turner<br />
Confirmation Bias<br />
From the NTSB: While on a night instrument<br />
approach to a non-towered airport, the A36<br />
<strong>Bonanza</strong> collided with the airport’s perimeter fence<br />
and terrain. The fence and perimeter road were<br />
parallel to, and about 750 feet east <strong>of</strong>, the runway.<br />
The last radar plot was at an altitude <strong>of</strong> 1,200 feet<br />
MSL, slightly east <strong>of</strong> the runway, and approximately<br />
435 feet from the accident site. Sheriff’s deputies<br />
reported that the weather was “foggy.” The pilot<br />
was flying an RNAV (GPS) approach. The published<br />
minimums for the approach were a 400-foot ceiling<br />
and one mile visibility. The automated weather<br />
station about 33 miles northwest <strong>of</strong> the accident<br />
site reported calm winds, temperature 41°F, dew<br />
point 41°F, visibility less than 1/4 mile, and a<br />
Runway Visual Range ( RVR) <strong>of</strong> 600 feet variable<br />
to 1200 feet in fog and an indefinite ceiling. An<br />
examination <strong>of</strong> the airplane failed to reveal any<br />
anomalies with the airframe, structure, or systems.<br />
An engine test run was conducted and the engine<br />
was able to produce rated horsepower, without<br />
hesitation or interruption. Under the conditions at<br />
the time, the pilot appeared to have mistaken the<br />
east perimeter road for the runway landing point.<br />
The NTSB’s probable cause: the pilot’s decision to<br />
continue the approach below minimums without<br />
visual references, and subsequent collision with<br />
the perimeter fence/terrain.<br />
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22 AMERICAN BONANZA SOCIETY JANUARY 2012