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 is less dense than dry air, leading to a modest decrease in aircraft performance and affecting density altitude calculations, an effect comparable to a 5-degree F temperature increase.
GPS-derived altitude can significantly differ from barometric (MSL) altitude, potentially by hundreds of feet, posing a safety trap for pilots who may rely on it without understanding the discrepancy.
The article also notes concerns regarding pilot risk management and decision-making, particularly for low-hour pilots in challenging flight scenarios.
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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