Handling Heat

Excellent article by Tom Turner in Julys issue ("Hot And High How-To") but a couple of things come to mind. First, in the sidebar Cruise Considerations, you infer that a high density altitude decreases the available amount of oxygen for breathing. This is technically true, but the difference is so small it is hardly worth considering. Obviously, if one feels the need for it oxygen should be taken regardless of altitude, density or otherwise. A pulse oximeter is a huge help here, and the basic guideline is to maintain a saturation level that is within 10 percent of sea level saturation to avoid judgment impairment. Dr. Jack Hastings, former author of the American Bonanza Societys Aeromedical column, and a past president of the group, was kind enough to research and answer my question concerning density altitude and human saturation. Briefly stated, he said that oxygen saturation in the human body is dependant upon the "partial pressure" of oxygen in the atmosphere to create the osmotic exchange in the lungs. That partial pressure is only slightly affected by density altitude, and therefore insignificant.

Key Takeaways:

• The article clarifies that high density altitude has a negligible effect on human oxygen saturation and discusses optimal EGT values for engine cooling during takeoff in high-power settings.
• "Plan continuation bias" is highlighted as a significant cognitive error impacting decision-making in aviation and other professional domains, where projects continue despite warning signs.
• A previous article's perspective on civilian aircraft in Military Operations Areas is challenged, with an update confirming a military pilot was reprimanded for an improper intercept.
• Information is provided about specific Light Sport Aircraft, such as the Corsrio and the developing ICON A5 amphibious LSA, in response to reader inquiries.

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