Quote:
Originally Posted by Piotrsko
It is compressor stage heated air that is bypassed from the front of the engine ran down a flex duct in the wing into the cabin then back out to atmosphere through a pressure valve.
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Would be quite harder to bleed enough air from a turbocharger fitted to a conventional reciprocating engine. On a sidenote, the ACM also resorts to a turbocompressor and a heat exchanger which resembles an intercooler.