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Expectations

You often see what you expect to see rather than what’s really there, a deadly combination on a Sarasota runway.


The Cessna 152 was cleared to take off from
ûpoint A, and eight seconds later a 172 at
ûpoint B was cleared to taxi into position and
ûhold. The impact was at point C.

Posted on the wall of my organic chemistry lab at the University of Wisconsin was a sign that read, “Expectations cloud observations.” It’s a postulate that’s as true in aviation as it is in science.

In a chem lab, if you expect the solution to have a bluish tint, your eyes may fool you and spot blue when there’s really none to be found. In doing an aircraft preflight, a fuel tester may look like blue avgas rather than water simply because you have an eyeful of sky. …


 
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