e tried to turn the recirc fans off. It’s an old trick on the 73
how does cockpit air get recirculated? I thought it all goes overboard and recircs are only for the cabin..
only cockpit-smoking trick I know is putting a large coin under the smoke evac lever in the 747-400 cockpit opening slightly the (which in the early design used to be) sextant-periscope port...