What are the chances of an aircraft cruhing due to the boundary layer on the wing having the rain drops?
Answer:
well they do deform the aerofoil and cause a reduction in performance of the wing in terms of providing lift; however, it would take an awful lot of frozen rain drops on the winds to cause an aircrash.
The proposition is very unlikely in the case of fixed winged aircrafts, however it is not very uncommon in the case of helicopters where water condensation on the edges of the rotors do cause crashes.
Thankfully, most aircrafts have systems to prevent excessive accumulation on the lift providing surfaces - thus keeping their aerifoil nature intact.
raindrops on the wing won't make the plane crash. Only if you have a significant amount of ice buildup will it affect the shape of the airfoil, and thus affect the performance of the aircraft.
Planes fly through rain all of the time.
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