Originally Posted by
RatherBeFlying
Can you absolutely guarantee that 90 seconds from now there will not be any fire, smoke or incapacitating chemicals in the cabin?
Once the cabin is breached by smoke and concomitant incapacitating substances, some if not all the pax will succumb in the certification standard 90 seconds before evacuation is completed.
Can you absolutely guarantee that 90 seconds from now that passengers won't deplaning into burning fuel?
IMHO it's a judgement call - one best made by the captain whilst communicating with other key players (eg RFF).