How Rain May Affect Aircraft Performance

To my mind, only a couple of decent reasons exist to fly through rain: First, because your destination is out there in or beyond the precip-and its light rain and not far through it, at that; second, because youre too cheap or lazy to wash the plane normally. Otherwise, rain stands among those conditions to not take lightly-and on many fronts, to be taken as a condition to avoid as much as possible. When you think about it systematically, a lot goes on with the airplane when exposed to rain and-aside from the possibility of improved cooling on a hot day-its difficult to conjure up much to commend rain flying to anyone. But, we know youre going to fly in the rain; we do, too, but begrudgingly and guardedly-or avoid it if the datalink weather returns show orange or red. So instead of saying, "Dont do what we do, have done, and will probably do again," we offer five strong reasons to make you think about whats happening to the aircraft when flown in rain.

Key Takeaways:

• Rain poses significant risks to aircraft systems by damaging moisture-sensitive components, allowing water intrusion into fuel tanks, and accumulating in control surfaces, affecting weight and balance.
• Flying in rain severely degrades an aircraft's aerodynamic performance, leading to reduced lift, increased drag, and a notably higher stall speed, especially at higher angles of attack.
• Rain-producing weather systems often bring turbulent conditions, downdrafts, and dangerous microbursts, which can critically compromise flight control and safety, particularly during approaches or near the ground.

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