On the jumbo I think the SOP for smoke is to crack the L4 door slightly so the gates have folded in and then tie the handle to stop it rotating further round
It forms part of the SMOKE REMOVAL procedure, if necessary, when the source of the smoke or fumes persists or is severe and is in the cabin.
In this case you will have depressurised the aircraft having desended to as low as safe and reduced speed
If the smoke of fumes concentration is determined to be in the forward section of the cabin, Door1
or Door2
and a Door 4
or Door 5 is then opened
If the smoke of fumes concentration is determined to be in the aft section of the cabin, a Door 2
only is opened
Before opening any door it is put into
manual mode!
It is secured in the 12 o'clock position