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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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Visit us on the web gannaviation.com<br />

22 AMERICAN BONANZA SOCIETY JANUARY 2012

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