My previous remarks about density versus humidity were not about quantitative calculations of density. I merely presented a simple way of understanding why it is that on a humid day, other factors being equal, we need to anticipate a modest decrease in aircraft performance.
Humid air causes a small but measurable decrease in air density (under one percent at 100% humidity), equivalent to a 5°F temperature increase, which adversely impacts aircraft performance and density altitude computations.
GPS-derived altitude can differ significantly (by hundreds of feet) from barometric/MSL altitude, potentially misleading pilots who rely on it, especially when displayed on backup instruments.
The article highlights concerns regarding pilot risk management, particularly for inexperienced pilots flying in challenging conditions while overly relying on GPS navigation.
My previous remarks about density versus humidity were not about quantitative calculations of density. I merely presented a simple way of understanding why it is that on a humid day, other factors being equal, we need to anticipate a modest decrease in aircraft performance.
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