737-800 Recirc fans
Hi guys,
I have seen a few Capts turn off the Left Recirc fan off on the ground to reduce cockpit noise whilst using the AC. The other trick I have seen is operating off just the right pack although this does increase fuel consumption.
I was told by a trainer that this is not a recommended practice, however I didnt ask for a reason (which was my own fault for not questioning)
My question is, does it have any detrimental effect turning the left recirc fan off?
Thanks