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Almost all the helicopters designed and manufactured by Mil have a hole above the intake. e.g.

image1

What is it for? APU? Other helicopters made by this company:

image2

enter image description here

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2 Answers 2

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This link claims it's the central oil cooler intake for the Mi-26.

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This is lubrication oil cooler. APU intake is on right side and APU exhaust is on left side(small APU exhaust opening behind engine exhaust in first pic and third pic )

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