Originally Posted by
OrionFE
Similar situation in a B747-100 taking off out of EWR. Right after rotate as I turned on the first Pack, smoke started filling up the cockpit. After donning the mask and goggles, and trying to fly the departure with a heavy -100 that does not want to fly in the first place, the smoke quickly dissipated>
Yes, when on a takeoff with the packs off one would tend to think that bleed smoke would be precluded from entering the cockpit, but the trim air valves open on takeoff on freighters and 747-2a's and 747-2b's........so beware of trim air.