Originally Posted by
exwessex
Hi Bazzarius.Engine pylons 2,3 and 4 contain a 'turbo compressor '-this is an engine bleed air powered air pump supplying air to the air-conditioning packs-when the first generation jet airliners came into service bleed air from the engines wasn't allowed to go straight into the cabin as there were concerns about contamination.
And 30 years later, the person who'd decided that said 'told you so'